A method and system for flexible control of the front and rear roller tables before and after intermediate cooling in a heavy plate hot rolling production line

Abstract

The present application relates to the field of automatic control technology for rolling steel, and provides a flexible control method and system for the roll table before and after the intermediate cooling in a thick plate hot rolling production line. The method acquires real-time position information of each billet and determines the current corresponding control function. In response to the start of the intermediate cooling control function, the warm billet is transported away from the intermediate cooling device to empty the third roll table. When the tail of the warm billet reaches the junction of the third roll table and the fourth roll table, the third roll table is switched from the warm control function to the intermediate cooling control function. When the tail of the current billet enters the junction of the first roll table and the second roll table, the first roll table is switched to the rough rolling mill rolling function, so that the rough rolling mill starts rolling the next billet before the information of the current billet is transferred to the warm area. When the head of the current billet reaches the junction and the information transfer is completed, the third roll table is switched back to the warm control function, so as to solve the problem of reduced rolling rhythm caused by insufficient capacity of the warm area after the intermediate cooling device is put into use.

Description

Technical Field

[0001] This application relates to the field of steel rolling automation control technology, and in particular to a flexible control method and system for the intermediate cooling front and rear roller conveyors in a thick plate hot rolling production line. Background Technology

[0002] In a hot-rolled thick plate production line, the intermediate billets rolled by the roughing mill must be cooled to the target temperature before entering the finishing mill. Following the roughing mill, along the billet conveying direction, there are a roughing mill exit roller table and a waiting-to-warm roller table. The roughing mill exit roller table conveys the intermediate billets after roughing, while the waiting-to-warm roller table temporarily stores the cooled billets, awaiting entry into the finishing mill. In actual production, after the intermediate billets are output from the roughing mill exit roller table, they are received by the waiting-to-warm roller table and await finishing, thus achieving coordination between the temperature control of the intermediate billets and the production line rhythm.

[0003] In existing technology, to accelerate the cooling rate and shorten the cooling time of intermediate billets, an intermediate cooling device is introduced after the roughing mill. An intermediate cooling output roller conveyor is installed on the discharge side of the intermediate cooling device, and this roller conveyor is connected end-to-end with the waiting-to-warm roller conveyor. After the intermediate cooling device is put into operation, the intermediate cooling output roller conveyor is controlled by the intermediate cooling control function, and the waiting-to-warm roller conveyor is controlled by the waiting-to-warm control function. After the current billet has completed cooling in the intermediate cooling device, its process control information is transferred from the intermediate cooling control function to the waiting-to-warm control function. After the transfer is completed, the roughing mill begins rolling the next billet.

[0004] However, existing technical solutions have at least the following problems: First, after the intermediate cooling unit is put into operation, the intermediate cooling output roller conveyor continues to operate as a cooling output channel and does not participate in the waiting function of the waiting roller conveyor, resulting in a shortened usable length and reduced waiting capacity of the waiting roller conveyor, which limits the continuous production rhythm of the production line; Second, the roughing mill must wait for the process control information of the current billet to be completely transferred to the waiting control function before it can start rolling the next billet. This sequential waiting logic results in idle waiting time for the roughing mill, reducing the rolling rhythm of the roughing mill and the overall efficiency of the production line; Third, the site of the thick plate hot rolling production line is fixed, and it is impossible to expand the waiting area capacity by adding roller conveyors. Therefore, how to solve the problem of insufficient waiting area capacity and roughing mill waiting time while maintaining cooling continuity has become an urgent technical challenge to be solved in this field. Summary of the Invention

[0005] This application provides a flexible control method and system for the intermediate cooling front and rear roller conveyors in a thick plate hot rolling production line, in order to solve the technical problems in the prior art where the intermediate cooling output roller conveyor is occupied for a long time, resulting in insufficient capacity of the waiting area and reduced rolling rhythm of the roughing mill.

[0006] To achieve the above objectives, in a first aspect, this application provides a method for flexible control of the intermediate cooling roller table before and after the intermediate cooling of a thick plate hot rolling production line. The method is applied to a thick plate hot rolling production line, which includes a roughing mill and a first roller table, a second roller table, a third roller table, a fourth roller table sequentially arranged after the roughing mill, and an intermediate cooling device arranged on the second roller table. The first and second roller tables together constitute the rolling extension roller table of the roughing mill, and the third and fourth roller tables together constitute the waiting area for cooling. The method includes: Obtain real-time position information of each steel billet on the production line, including the head and tail positions of each steel billet; Based on real-time location information, the current control function corresponding to each steel billet is determined. The control functions include intermediate cooling control function and waiting temperature control function. In response to the activation of the intermediate cooling control function, the steel billet waiting to be heated in the waiting zone is controlled to be transported away from the intermediate cooling device. When the tail of the steel billet waiting to be heated on the third roller conveyor reaches the first switching position, the third roller conveyor is switched from the waiting-to-heat control function to the intermediate cooling control function. The first switching position is the junction of the third roller conveyor and the fourth roller conveyor. When the tail of the current billet enters the second switching position, the first roller table is switched from the intermediate cooling control function to the roughing mill rolling function, so as to allow the roughing mill to start rolling the next billet before the process control information of the current billet has been transferred to the waiting temperature zone. The second switching position is the junction of the first roller table and the second roller table. When the head of the current billet reaches the first switching position and the process control information of the current billet is transferred to the waiting temperature control function, the third roller conveyor is switched back from the intermediate cold control function to the waiting temperature control function, and the waiting temperature billet in the waiting temperature zone is controlled to retreat to the starting position of the third roller conveyor.

[0007] Preferably, the real-time position information of each steel billet on the production line is obtained, including: Obtain the average linear velocity and scanning cycle of each steel billet on the roller table; Based on the average linear velocity and scanning cycle, the real-time head position of each billet is determined by the first formula and the real-time tail position of each billet is determined by the second formula. First formula: ; Second formula: ; in, This is the sequence number of the scan cycle. ; For the first The real-time head position of the steel billet under each scanning cycle. For the first The head position of the billet in each scanning cycle; For the first The real-time tail position of the billet during each scanning cycle. For the first The tail position of the billet in each scanning cycle; The mean linear velocity, The scan cycle.

[0008] Preferably, when hour, This represents the initial head position of the current steel billet. This represents the initial tail position of the current steel billet; In response to the rolling force of the roughing mill on the current billet becoming zero, the center point of the roughing mill rolls is set to the tail position of the current billet, and the sum of the center point of the roughing mill rolls and the length of the current billet is set to the head position of the current billet.

[0009] Preferably, it further includes: Based on the occupancy of each steel billet on the roller table, determine the average linear velocity of each steel billet on the roller table. When the billet occupies only one set of rollers, the average linear velocity is the linear velocity of that set of rollers; When a steel billet occupies two adjacent sets of rollers at the same time, the average linear velocity is the average of the linear velocities of the two sets of rollers.

[0010] Preferably, the intermediate cooling control function is activated in the following manner: In response to the current billet head reaching the inlet of the intermediate cooling unit, the intermediate cooling unit is controlled to spray cooling medium.

[0011] Preferably, switching the third roller conveyor from a waiting-to-warm-up control function to an intermediate-cooling control function includes: The speed of the third roller conveyor is controlled to follow the speed of the second roller conveyor, and the direction of the third roller conveyor is controlled to follow the direction of the second roller conveyor.

[0012] Preferably, after switching the first roller table from intermediate cooling control function to roughing mill rolling function, the method further includes: Determine the rotation direction of the first roller table based on the current rolling pass being executed by the roughing mill; When the roughing mill performs an odd number of rolling passes, the first roller table rotates in the forward direction; when the roughing mill performs an even number of rolling passes, the first roller table rotates in the reverse direction.

[0013] Preferably, the current process control information of the billet includes: the current length of the billet, the head position, the tail position, and the identification number; The current process control information for the steel billet has been transferred to the waiting temperature control function, including: The current length, head position, tail position, and identification number of the billet are transferred from the area corresponding to the intermediate cold control function to the area corresponding to the waiting temperature control function. Upon completion of the transfer, the current billet length, head position, tail position, and identification number are cleared within the area corresponding to the intermediate cold control function.

[0014] Preferably, after switching the third roller conveyor from the intermediate cooling control function back to the waiting temperature control function, the process includes: The third and fourth roller conveyors are controlled by a unified temperature control function, and the steel billets waiting to be heated in the temperature waiting zone oscillate back and forth between the third and fourth roller conveyors.

[0015] Secondly, this application discloses a flexible control system for the intermediate cooling roller table before and after the intermediate cooling of a thick plate hot rolling production line. The production line includes a roughing mill and a first roller table, a second roller table, a third roller table, and a fourth roller table arranged sequentially after the roughing mill, as well as an intermediate cooling device arranged on the second roller table. The first and second roller tables together constitute the rolling extension roller table of the roughing mill, and the third and fourth roller tables together constitute the waiting area for cooling. The system includes: The controller is configured as follows: Obtain real-time position information of each steel billet on the production line, including the head and tail positions of each steel billet; Based on real-time location information, the current control function corresponding to each steel billet is determined. The control functions include intermediate cooling control function and waiting temperature control function. In response to the activation of the intermediate cooling control function, the steel billet waiting to be heated in the waiting zone is controlled to be transported away from the intermediate cooling device. When the tail of the steel billet waiting to be heated on the third roller conveyor reaches the first switching position, the third roller conveyor is switched from the waiting-to-heat control function to the intermediate cooling control function. The first switching position is the junction of the third roller conveyor and the fourth roller conveyor. When the tail of the current billet enters the second switching position, the first roller table is switched from the intermediate cooling control function to the roughing mill rolling function, so as to allow the roughing mill to start rolling the next billet before the process control information of the current billet has been transferred to the waiting temperature zone. The second switching position is the junction of the first roller table and the second roller table. When the head of the current billet reaches the first switching position and the process control information of the current billet is transferred to the waiting temperature control function, the third roller conveyor is switched back from the intermediate cold control function to the waiting temperature control function, and the waiting temperature billet in the waiting temperature zone is controlled to retreat to the starting position of the third roller conveyor.

[0016] As can be seen from the above technical solutions, this application provides a flexible control method and system for the intermediate cooling roller conveyor in a thick plate hot rolling production line. This method dynamically switches the third roller conveyor between the waiting-to-warm-up control function and the intermediate cooling control function. During the operation of the intermediate cooling device, the third roller conveyor first operates as a cooling output channel for the intermediate cooling control function. After the current billet completes cooling and exits the third roller conveyor, the third roller conveyor immediately switches back to the waiting-to-warm-up control function and participates in the waiting-to-warm-up zone as part of the waiting-to-warm-up area. This allows the function of the third roller conveyor to be dynamically reused on demand between the intermediate cooling control function and the waiting-to-warm-up control function, while the waiting-to-warm-up zone remains unchanged. The third and fourth roller conveyors together form a complete length. At the same time, the first roller conveyor switches to the roughing mill rolling function when the current billet enters the second switching position. The roughing mill can start rolling the next billet before the current billet process control information has been transferred to the waiting area. The roughing mill rolling process and the information handover process are executed in parallel. Under the premise that the cooling continuity of the intermediate cooling unit is not affected, it solves the problems of insufficient waiting area capacity due to the long-term occupation of the third roller conveyor after the intermediate cooling unit is put into use, and the reduced rolling rhythm caused by the roughing mill having to wait for the complete transfer of information before it can start rolling. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 Flowchart of the flexible control method for the intermediate cooling front and rear roller conveyors in a thick plate hot rolling production line provided in this application embodiment; Figure 2 The control logic flowchart of the flexible control method for the intermediate cooling front and rear roller conveyors of the thick plate hot rolling production line provided in the embodiments of this application; Figure 3 A schematic diagram of the function switching control logic of the third roller table in the flexible control method for the intermediate cooling front and rear roller tables of the thick plate hot rolling production line provided in the embodiments of this application; Figure 4 A schematic diagram of the function switching control logic of the first roller table in the flexible control method for the intermediate cooling front and rear roller tables of the thick plate hot rolling production line provided in the embodiments of this application; Figure 5 This is a breakdown flowchart of step S100 in the flexible control method for intermediate cooling roller conveyors before and after the hot rolling production line of thick plate provided in the embodiments of this application. Detailed Implementation

[0019] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application.

[0020] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0021] The terms "first," "second," "third," etc., are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms can be used interchangeably where appropriate.

[0022] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0023] In the field of intermediate cooling control technology for thick plate hot rolling production lines, existing technologies arrange an exit roller table and a waiting-to-warm roller table sequentially along the billet conveying direction after the roughing mill. The exit roller table conveys the intermediate billet rolled by the roughing mill to the rear, while the waiting-to-warm roller table temporarily stores the cooled billet, awaiting its entry into the finishing rolling process. To accelerate the cooling rate and shorten the cooling time of the intermediate billet, an intermediate cooling device is introduced after the roughing mill. An intermediate cooling output roller table is installed on the discharge side of the intermediate cooling device, and this intermediate cooling output roller table is connected end-to-end with the waiting-to-warm roller table. After the intermediate cooling device is put into operation, the intermediate cooling output roller table continuously operates as a cooling output channel, controlled by the intermediate cooling control function, and does not participate in the waiting-to-warm function of the waiting-to-warm roller table. This results in a shortened usable length and reduced waiting-to-warm capacity of the waiting-to-warm roller table. Meanwhile, after the steel billet has finished cooling in the intermediate cooling unit, its process control information is transferred from the intermediate cooling control function to the waiting-to-warm-up control function. Only after the transfer is completed can the roughing mill start rolling the next steel billet. This sequential waiting logic results in idle waiting time for the roughing mill. The site of a thick plate hot rolling production line is fixed, and it is impossible to expand the waiting-to-warm-up area capacity by adding roller conveyors. How to simultaneously solve the problem of insufficient waiting-to-warm-up area capacity and the waiting time of the roughing mill while maintaining the cooling continuity of the intermediate cooling unit has become a pressing technical challenge in this field.

[0024] To solve the above problems, see [link to relevant documentation]. Figures 1-4 This application provides a method for flexible control of the intermediate cooling front and rear roller conveyors in a thick plate hot rolling production line, which is applied to the thick plate hot rolling production line.

[0025] The hot rolling production line for heavy plates includes a roughing mill and four roller tables arranged sequentially after the roughing mill, as well as an intermediate cooling unit located on the second roller table. The first and second roller tables together constitute the rolling extension roller table of the roughing mill, and the third and fourth roller tables together constitute the waiting area.

[0026] Specifically, a first roller table, a second roller table, a third roller table, and a fourth roller table are sequentially arranged along the billet conveying direction after the roughing mill. An intermediate cooling device is located on the second roller table. The first and second roller tables together constitute the roughing mill's rolling extension roller table, used to convey the billets rolled by the roughing mill towards the intermediate cooling device. The third and fourth roller tables together form a waiting-warming zone, the end of which connects to the finishing mill, used to temporarily store the billets cooled by the intermediate cooling device, awaiting their entry into the finishing mill. Downstream of the fourth roller table, multiple sets of waiting-warming roller tables, such as a fifth and sixth roller table, can be added according to the actual production line layout, and are managed by the same waiting-warming control function as the third and fourth roller tables. The first switching position is at the junction of the third and fourth roller tables. The second switching position is at the junction of the first and second roller tables. The starting position of the third roller table is the end of the third roller table closest to the intermediate cooling device.

[0027] The methods for flexible control of the intermediate cooling and pre- and post-cooling roller conveyors in thick plate hot rolling production lines include: S100: Obtain the real-time location information of each steel billet on the production line.

[0028] The location information includes the head and tail positions of each steel billet.

[0029] Specifically, the real-time position information of each steel billet on the production line is acquired. This real-time position information includes the head and tail positions of each billet. Acquiring the real-time position information of each steel billet on the production line means acquiring the head and tail positions of each billet at the current moment. The head position refers to the position of the front end of the billet along the conveying direction, and the tail position refers to the position of the rear end of the billet along the conveying direction. This acquisition operation is performed once in each control cycle to obtain the head and tail positions of each steel billet at the current moment.

[0030] In some embodiments, see Figure 5 To obtain real-time location information of each steel billet on the production line, including: S101. Obtain the average linear velocity and scanning cycle of each billet on the roller table.

[0031] Specifically, the average linear velocity and scanning cycle of each billet on the roller conveyor are obtained. The scanning cycle is the length of each control cycle, and a position update calculation is performed once in each control cycle. After obtaining the average linear velocity and scanning cycle of each billet on the roller conveyor, these values ​​are provided to the subsequent position determination steps. The average linear velocity is recalculated in each control cycle based on the real-time linear velocity value of each billet on the roller conveyor, while the scanning cycle is a fixed value.

[0032] S102. Based on the average linear velocity and scanning cycle, the real-time head position of each billet is determined by the first formula and the real-time tail position of each billet is determined by the second formula. First formula: ; Second formula: ; in, This is the sequence number of the scan cycle. ; For the first The real-time head position of the steel billet under each scanning cycle. For the first The head position of the billet in each scanning cycle; For the first The real-time tail position of the billet during each scanning cycle. For the first The tail position of the billet in each scanning cycle; The mean linear velocity, The scan cycle.

[0033] Specifically, based on the acquired average linear velocity V and scanning period Δt, the real-time head position of each billet is determined using a first formula, and the real-time tail position of each billet is determined using a second formula. n is the sequence number of the scanning period, and n is an integer greater than or equal to 2. In each scanning period, the average linear velocity V and scanning period Δt are acquired. The head position Phead(n-1) of the previous scanning period is added to the product of the average linear velocity V and scanning period Δt to obtain the head position Phead(n) of the current scanning period. When determining the real-time tail position of each billet using the second formula, the average linear velocity V and scanning period Δt are acquired in each scanning period. The tail position Ptail(n-1) of the previous scanning period is added to the product of the average linear velocity V and scanning period Δt to obtain the tail position Ptail(n) of the current scanning period. By performing the above calculations in each scanning period, the head and tail positions of each billet are continuously updated.

[0034] In some embodiments, when hour, This represents the initial head position of the current steel billet. This represents the initial tail position of the current steel billet.

[0035] In response to the rolling force of the roughing mill on the current billet becoming zero, the center point of the roughing mill rolls is set to the tail position of the current billet, and the sum of the center point of the roughing mill rolls and the length of the current billet is set to the head position of the current billet.

[0036] Specifically, the moment when the rolling force of the roughing mill on the current billet becomes zero is the moment of billet ejection. After the roughing mill finishes rolling the current billet, the rolling force drops to zero, at which point the initial position setting operation is performed. In response to the rolling force of the roughing mill on the current billet becoming zero, the center point of the roughing mill rolls is set as the tail position of the current billet. The center point of the roughing mill rolls is the center position between the upper and lower rolls of the roughing mill, and has fixed physical coordinates on the production line. After the tail position of the current billet is set as the position of the center point of the roughing mill rolls, the sum of the center point of the roughing mill rolls and the length of the current billet is set as the head position of the current billet, using the center point of the roughing mill rolls as a reference. The length of the current billet is the length of the current billet along the conveying direction after the roughing mill finishes rolling. The head position of the current billet is the position where the center point of the roughing mill rolls is offset along the conveying direction by one current billet length. With the above settings, the tail and head positions of the current billet are assigned initial values ​​at the moment of billet ejection in the roughing mill. These initial values ​​serve as the starting values ​​for subsequent recursive calculations, namely Phead(1) and Ptail(1). After the settings are completed, the position update calculation is performed based on these initial values ​​in each subsequent scanning cycle.

[0037] In some embodiments, it also includes: The average linear velocity of each billet on the roller table is determined based on the occupancy of each billet on the roller table.

[0038] When the billet occupies only one set of rollers, the average linear velocity is the linear velocity of that set of rollers.

[0039] When a steel billet occupies two adjacent sets of rollers at the same time, the average linear velocity is the average of the linear velocities of the two sets of rollers.

[0040] Specifically, the average linear velocity is determined based on the current occupancy status of each billet on the roller conveyor. During transport, each billet may occupy only one set of roller conveyors or simultaneously occupy two adjacent sets. After obtaining the current occupancy status of each billet, the method for determining the average linear velocity is determined accordingly. When a billet occupies only one set of roller conveyors, the linear velocity of that set is the average linear velocity. When a billet simultaneously occupies two adjacent sets of roller conveyors, the linear velocity values ​​of each of the two sets are obtained, and the sum of these values ​​is divided by two; the result is the average linear velocity. The average linear velocity is redefined in each control cycle based on the roller conveyor occupancy status of each billet, ensuring that the average linear velocity used for position recursion calculation matches the linear velocity of the roller conveyor currently occupied by each billet. After determining the average linear velocity in the above manner, this average linear velocity is used for position recursion calculation.

[0041] S200. Based on real-time location information, determine the current control function corresponding to each steel billet. The control function includes intermediate cooling control function and waiting temperature control function.

[0042] Specifically, the control function corresponding to each steel billet is determined based on the obtained head and tail positions. The appropriate control function (intermediate cooling or preheating) is determined based on the current roller conveyor area of ​​each billet. In each control cycle, the corresponding control function is determined based on the current position of each billet. Each billet uniquely corresponds to one control function at any given time. After determining the current control function for each billet, the result serves as the basis for performing function switching operations in subsequent control steps.

[0043] S300, in response to the activation of the intermediate cooling control function, controls the steel billet waiting to be heated in the waiting zone to be transported away from the intermediate cooling device.

[0044] Specifically, after the intermediate cooling control function is activated, the third and fourth roller conveyors are controlled to move forward. As the third and fourth roller conveyors move forward, the steel billets waiting to be heated in the waiting area move as a whole away from the intermediate cooling device. After the steel billets in the waiting area have moved as a whole, the steel billets on the third roller conveyor are transferred to the fourth roller conveyor, and the third roller conveyor becomes empty. This conveying operation is executed immediately after the intermediate cooling control function is activated.

[0045] In some embodiments, the intermediate cooling control function is activated in the following ways: In response to the current billet head reaching the inlet of the intermediate cooling unit, the intermediate cooling unit is controlled to spray cooling medium.

[0046] Specifically, the current head position of the steel billet is obtained based on real-time location information. When the head of the steel billet reaches the inlet of the intermediate cooling unit, the intermediate cooling unit sprays cooling medium. The steel billet is cooled by the cooling medium as it passes through the intermediate cooling unit.

[0047] S400 When the tail of the steel billet waiting to be heated on the third roller conveyor reaches the first switching position, the third roller conveyor is switched from the waiting-to-heat control function to the intermediate cooling control function. The first switching position is the junction of the third roller conveyor and the fourth roller conveyor.

[0048] Specifically, the tail position of the steel billet awaiting heating on the third roller conveyor is obtained based on real-time location information. When the tail position reaches the junction of the third and fourth roller conveyors, the third roller conveyor no longer carries the steel billet and switches its control function from heating control to intermediate cooling control. After the third roller conveyor switches to intermediate cooling control, the steel billet output from the intermediate cooling device passes through the second roller conveyor and enters the third roller conveyor, which continues to transport the steel billet forward.

[0049] In some embodiments, switching the third roller conveyor from a waiting-to-warm-up control function to an intermediate-cooling control function includes: The speed of the third roller conveyor is controlled to follow the speed of the second roller conveyor, and the direction of the third roller conveyor is controlled to follow the direction of the second roller conveyor.

[0050] Specifically, after the third roller conveyor switches to the intermediate cooling control function, it serves as the cooling output channel for the intermediate cooling unit, receiving the steel billets output from the intermediate cooling unit and continuing to convey them forward. The current operating speed and direction of the second roller conveyor are obtained, and the operating speed and direction of the third roller conveyor are set to the same value as the current operating speed and direction of the second roller conveyor. The third roller conveyor then operates according to the aforementioned speed and direction.

[0051] S500 When the tail of the current billet enters the second switching position, the first roller table is switched from intermediate cooling control function to roughing mill rolling function, so as to allow the roughing mill to start rolling the next billet before the process control information of the current billet has been transferred to the waiting temperature zone. The second switching position is the junction of the first roller table and the second roller table.

[0052] Specifically, the tail position of the current steel billet is obtained based on real-time location information. When the tail position reaches the junction of the first and second roller conveyors, the first roller conveyor no longer carries the current steel billet, and its control function is switched from intermediate cooling control to roughing mill rolling function. After the first roller conveyor switches to roughing mill rolling function, the roughing mill begins rolling the next steel billet.

[0053] In some embodiments, after switching the first roller table from intermediate cooling control function to roughing mill rolling function, the method further includes: The rotation direction of the first roller table is determined based on the current rolling pass being executed by the roughing mill.

[0054] When the roughing mill performs an odd number of rolling passes, the first roller table rotates in the forward direction; when the roughing mill performs an even number of rolling passes, the first roller table rotates in the reverse direction.

[0055] Specifically, the roughing mill uses a reciprocating rolling method to perform multi-pass rolling on the steel billet. The current rolling pass being executed by the roughing mill is obtained. When the roughing mill executes an odd number of passes, the first roller table is controlled to rotate in the forward direction. When the roughing mill executes an even number of passes, the first roller table is controlled to rotate in the reverse direction. The rotation direction of the first roller table is consistent with the movement direction of the steel billet in the current pass.

[0056] S600 When the head of the current billet reaches the first switching position and the process control information of the current billet is transferred to the waiting temperature control function, the third roller conveyor is switched back from the intermediate cold control function to the waiting temperature control function, and the waiting temperature billet in the waiting temperature zone is controlled to retreat to the starting position of the third roller conveyor.

[0057] Specifically, the current head position of the billet is obtained based on real-time location information, along with the transfer status of the process control information for the billet. When the head position reaches the junction of the third and fourth roller conveyors and the process control information has been transferred to the waiting-to-warm-up control function, the control function of the third roller conveyor is switched back from the intermediate cooling control function to the waiting-to-warm-up control function. After the third roller conveyor switches back to the waiting-to-warm-up control function, the third and fourth roller conveyors are controlled to run in opposite directions, and the billet waiting to be heated in the waiting-to-warm-up zone retreats towards the intermediate cooling device to the starting position of the third roller conveyor.

[0058] In some embodiments, the process control information for the current billet includes the current billet length, head position, tail position, and identification number.

[0059] The current process control information for the steel billet has been transferred to the waiting temperature control function, including: The current billet length, head position, tail position, and identification number are transferred from the area corresponding to the intermediate cooling control function to the area corresponding to the waiting temperature control function.

[0060] Specifically, when the head of the current billet reaches the junction of the third and fourth roller conveyors, the billet leaves the intermediate cooling unit area and enters the waiting-to-warming zone. The length, head position, tail position, and identification number of the current billet are transferred from the area corresponding to the intermediate cooling control function to the area corresponding to the waiting-to-warming control function, enabling the waiting-to-warming control function to continue tracking and managing the current billet based on its length, head position, tail position, and identification number.

[0061] Upon completion of the transfer, the current billet length, head position, tail position, and identification number are cleared within the area corresponding to the intermediate cold control function.

[0062] Specifically, after the current billet length, head position, tail position, and identification number are successfully migrated to the storage area corresponding to the waiting temperature control function, the current billet length, head position, tail position, and identification number in the storage area corresponding to the intermediate cooling control function are cleared, and the storage area is released to store billet data that will subsequently enter the intermediate cooling device area.

[0063] In some embodiments, after switching the third roller conveyor from the intermediate cooling control function back to the waiting temperature control function, the following steps are included: The third and fourth roller conveyors are controlled by a unified temperature control function, and the steel billets waiting to be heated in the temperature waiting zone oscillate back and forth between the third and fourth roller conveyors.

[0064] Specifically, after the third roller conveyor switches back to the waiting-to-warm-up control function, the third and fourth roller conveyors are controlled uniformly by the waiting-to-warm-up control function. The steel billets waiting to be heated in the waiting-to-warm-up zone oscillate back and forth on the third and fourth roller conveyors. The amplitude of the oscillation control is limited between the starting position of the third roller conveyor and the ending position of the fourth roller conveyor.

[0065] In some embodiments, this application also provides a flexible control system for the intermediate cooling roller table before and after the intermediate cooling of a thick plate hot rolling production line. The production line includes a roughing mill and a first roller table, a second roller table, a third roller table, and a fourth roller table arranged sequentially after the roughing mill, as well as an intermediate cooling device disposed on the second roller table. The first roller table and the second roller table together constitute the rolling extension roller table of the roughing mill, and the third roller table and the fourth roller table together constitute a waiting temperature zone, including:

[0066] The controller is configured as follows: Obtain real-time position information of each steel billet on the production line, including the head and tail positions of each steel billet; Based on real-time location information, the current control function corresponding to each steel billet is determined. The control functions include intermediate cooling control function and waiting temperature control function. In response to the activation of the intermediate cooling control function, the steel billet waiting to be heated in the waiting zone is controlled to be transported away from the intermediate cooling device. When the tail of the steel billet waiting to be heated on the third roller conveyor reaches the first switching position, the third roller conveyor is switched from the waiting-to-heat control function to the intermediate cooling control function. The first switching position is the junction of the third roller conveyor and the fourth roller conveyor. When the tail of the current billet enters the second switching position, the first roller table is switched from the intermediate cooling control function to the roughing mill rolling function, so as to allow the roughing mill to start rolling the next billet before the process control information of the current billet has been transferred to the waiting temperature zone. The second switching position is the junction of the first roller table and the second roller table. When the head of the current billet reaches the first switching position and the process control information of the current billet is transferred to the waiting temperature control function, the third roller conveyor is switched back from the intermediate cold control function to the waiting temperature control function, and the waiting temperature billet in the waiting temperature zone is controlled to retreat to the starting position of the third roller conveyor.

[0067] For details, please refer to the description in the above embodiment of the flexible control method for intermediate cooling front and rear roller conveyors in the hot rolling production line of thick plate, which will not be repeated here.

[0068] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this application. It should be understood that the above are only specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of this application should be included within the scope of protection of this application.

Claims

1. A method for flexible control of intermediate cooling roller tables before and after intermediate cooling in a thick plate hot rolling production line, applied to a thick plate hot rolling production line, the production line including a roughing mill and a first roller table, a second roller table, a third roller table, a fourth roller table arranged sequentially after the roughing mill, and an intermediate cooling device arranged on the second roller table, wherein the first roller table and the second roller table together constitute the rolling extension roller table of the roughing mill, and the third roller table and the fourth roller table together constitute the waiting temperature zone, characterized in that... The method includes: The real-time position information of each steel billet on the production line is obtained, including the head position and tail position of each steel billet. Based on the real-time location information, the control function corresponding to each steel billet is determined. The control function includes intermediate cooling control function and waiting temperature control function. In response to the activation of the intermediate cooling control function, the steel billet waiting to be heated in the waiting zone is controlled to be transported away from the intermediate cooling device. When the tail of the steel billet waiting to be heated on the third roller conveyor reaches the first switching position, the third roller conveyor is switched from the waiting-to-heat control function to the intermediate cooling control function. The first switching position is the junction of the third roller conveyor and the fourth roller conveyor. When the tail of the current billet enters the second switching position, the first roller table is switched from the intermediate cooling control function to the roughing mill rolling function, so as to allow the roughing mill to start rolling the next billet before the process control information of the current billet has been transferred to the waiting temperature zone. The second switching position is the junction of the first roller table and the second roller table. When the head of the current billet reaches the first switching position, and the process control information of the current billet is transferred to the waiting temperature control function, the third roller conveyor is switched back from the intermediate cooling control function to the waiting temperature control function, and the waiting temperature billet in the waiting temperature zone is controlled to retreat to the starting position of the third roller conveyor.

2. The method for flexible control of intermediate cooling and pre-cooling roller conveyors in a thick plate hot rolling production line according to claim 1, characterized in that, The acquisition of real-time position information of each steel billet on the production line includes: Obtain the average linear velocity and scanning cycle of each steel billet on the roller table; Based on the average linear velocity and the scanning period, the real-time head position of each billet is determined by the first formula and the real-time tail position of each billet is determined by the second formula. First formula: ； Second formula: ； in, This is the sequence number of the scan cycle. ; For the first The real-time head position of the steel billet under each scanning cycle. For the first The head position of the billet in each scanning cycle; For the first The real-time tail position of the billet during each scanning cycle. For the first The tail position of the billet in each scanning cycle; The mean linear velocity, The scan cycle.

3. The method for flexible control of intermediate cooling and pre-cooling roller conveyors in a thick plate hot rolling production line according to claim 2, characterized in that, when hour, This refers to the initial head position of the current steel billet. This refers to the initial tail position of the current steel billet; In response to the rolling force of the roughing mill on the current billet becoming zero, the center point of the roughing mill roll is set as the tail position of the current billet, and the sum of the center point of the roughing mill roll and the length of the current billet is set as the head position of the current billet.

4. The method for flexible control of intermediate cooling and pre-cooling roller conveyors in a thick plate hot rolling production line according to claim 2, characterized in that, Also includes: Based on the occupancy of each steel billet on the roller table, the average linear velocity of each steel billet on the roller table is determined. When the steel billet occupies only one set of rollers, the average linear velocity is the linear velocity of that set of rollers; When the billet occupies two adjacent sets of rollers at the same time, the average linear velocity is the average of the linear velocities of the two sets of rollers.

5. The method for flexible control of intermediate cooling and pre-cooling roller conveyors in a thick plate hot rolling production line according to claim 1, characterized in that, The intermediate cooling control function is activated in the following manner: In response to the head of the current steel billet reaching the inlet of the intermediate cooling device, the intermediate cooling device is controlled to spray cooling medium.

6. The method for flexible control of intermediate cooling and pre-cooling roller conveyors in a thick plate hot rolling production line according to claim 1, characterized in that, Switching the third roller conveyor from the waiting-to-warm-up control function to the intermediate-cooling control function includes: The operating speed of the third roller conveyor is controlled to follow the operating speed of the second roller conveyor, and the operating direction of the third roller conveyor is controlled to follow the operating direction of the second roller conveyor.

7. The method for flexible control of intermediate cooling and pre- and post-cooling roller conveyors in a thick plate hot rolling production line according to claim 1, characterized in that, After switching the first roller table from the intermediate cooling control function to the roughing mill rolling function, the following is also included: The rotation direction of the first roller table is determined based on the current rolling pass being executed by the roughing mill. When the roughing mill performs an odd number of rolling passes, the first roller table rotates in the forward direction; when the roughing mill performs an even number of rolling passes, the first roller table rotates in the reverse direction.

8. The method for flexible control of intermediate cooling and pre-cooling roller conveyors in a thick plate hot rolling production line according to claim 1, characterized in that, The process control information for the current billet includes: the length, head position, tail position, and identification number of the current billet; The current billet length, head position, tail position, and identification number are transferred from the area corresponding to the intermediate cooling control function to the area corresponding to the waiting temperature control function. In response to the completion of the transmission, the length, head position, tail position, and identification number of the current billet are cleared within the area corresponding to the intermediate cold control function.

9. The method for flexible control of intermediate cooling and pre-cooling roller conveyors in a thick plate hot rolling production line according to claim 1, characterized in that, After switching the third roller conveyor from the intermediate cooling control function back to the waiting temperature control function, the following steps are included: The third and fourth roller conveyors are controlled by the temperature control function, and the steel billets in the temperature waiting zone oscillate back and forth between the third and fourth roller conveyors.

10. A flexible control system for intermediate cooling roller tables before and after the intermediate cooling process in a thick plate hot rolling production line, the production line comprising a roughing mill and a first roller table, a second roller table, a third roller table, and a fourth roller table arranged sequentially after the roughing mill, and an intermediate cooling device disposed on the second roller table, wherein the first roller table and the second roller table together constitute the rolling extension roller table of the roughing mill, and the third roller table and the fourth roller table together constitute the waiting temperature zone, characterized in that... include: The controller is configured to: The real-time position information of each steel billet on the production line is obtained, including the head position and tail position of each steel billet. Based on the real-time location information, the control function corresponding to each steel billet is determined. The control function includes intermediate cooling control function and waiting temperature control function. In response to the activation of the intermediate cooling control function, the steel billet waiting to be heated in the waiting zone is controlled to be transported away from the intermediate cooling device. When the tail of the steel billet waiting to be heated on the third roller conveyor reaches the first switching position, the third roller conveyor is switched from the waiting-to-heat control function to the intermediate cooling control function. The first switching position is the junction of the third roller conveyor and the fourth roller conveyor. When the tail of the current billet enters the second switching position, the first roller table is switched from the intermediate cooling control function to the roughing mill rolling function, so as to allow the roughing mill to start rolling the next billet before the process control information of the current billet has been transferred to the waiting temperature zone. The second switching position is the junction of the first roller table and the second roller table. When the head of the current billet reaches the first switching position, and the process control information of the current billet is transferred to the waiting temperature control function, the third roller conveyor is switched back from the intermediate cooling control function to the waiting temperature control function, and the waiting temperature billet in the waiting temperature zone is controlled to retreat to the starting position of the third roller conveyor.

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