Pretreatment control method before rough rolling, terminal, medium and product

Abstract

The invention discloses a pretreatment control method before rough rolling, a terminal, a medium and a product, and belongs to the field of metallurgy rolling control. According to the method, pretreatment waiting points are arranged in a roller way area between a descaling box and a roughing mill, and the procedures of steel rotating, centering, width measuring and model recalculation are moved forwards. The method specifically comprises the steps of breaking through a traditional time sequence control process, and additionally arranging a special waiting point in a limited roller way space; steel rotating and automatic centering are conducted on the steel billet at the waiting point, and the width is measured; the width is sent to a secondary system to trigger a pass table, and then calculation and storage are carried out; and when the steel billet is conveyed to the roughing mill, synchronously starting the rolling mill and positioning according to the recalculation value. Through waiting point forward movement, roller bed structure transformation, dual-mode centering control and dynamic safety interlocking, parallel working procedures and pretreatment forward movement are achieved, rough rolling waiting time is remarkably shortened, rolling continuity and production efficiency are improved, and meanwhile production safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of metallurgical rolling control, and in particular to a pretreatment control method, terminal, medium and product before rough rolling. Background Technology

[0002] With the development of the steel industry market, ensuring product quality while continuously improving the production efficiency and equipment capacity utilization of heavy plate rolling has become crucial for reducing unit production costs and shortening delivery cycles. In the heavy plate rolling production process, the rolling mill itself and related equipment have been improved through technologies such as coordinated action optimization and timing adjustments, which have accelerated the production pace and alleviated some production bottlenecks to a certain extent.

[0003] However, through systematic analysis and on-site tracking of the entire production process data, it was found that there is still a significant imbalance in efficiency among the various stages of the current rolling line. Among them, the rolling efficiency of the roughing process has become the main bottleneck restricting the overall capacity release of the rolling line. Under the traditional process control mode, the excessively long rolling interval between the two billets in the roughing process not only directly affects the rolling cycle of a single billet, but also causes production delays in subsequent finishing rolling, cooling, and other processes, forming a chain reaction and disrupting the continuity and rhythm balance of the entire process.

[0004] Further analysis indicates that there is room for optimization in the process control flow before roughing. In the original process, after the steel billet exits the heating furnace, it needs to be transported over a long distance to the vicinity of the roughing mill entrance to wait. In the roughing mill entrance area, operations such as steel transfer, centering, width measurement, and model recalculation are completed. These steps are relatively lagging in terms of timing and are easily affected by factors such as equipment response speed and manual intervention, resulting in a long period of ineffective waiting time in the roughing mill. Summary of the Invention

[0005] To address the above problems, this invention provides a pretreatment control method before rough rolling. By establishing a pretreatment waiting point between the descaling box and the rough rolling mill, processes such as steel transfer, centering, width measurement, and secondary model recalculation are moved forward, thereby significantly shortening the waiting time of the billet before rough rolling and improving the operational continuity and overall production efficiency of the rough rolling mill.

[0006] In a first aspect, the present invention provides a pretreatment control method before rough rolling, comprising: S1, a pretreatment waiting point is set up in the roller table area between the descaling box and the roughing mill, and the billet is transported to the waiting point; S2, at the waiting point, the billet is transferred to another steel, its rolling direction is adjusted, the transferred billet is automatically centered, and the width of the billet is measured during the centered process; S3 sends the measured billet width to the secondary control system, triggers the secondary model to recalculate the pass order table, and stores the recalculated pass order table information in the buffer. S4, during the process of the billet being conveyed from the waiting point to the roughing mill inlet, the rolling mill equipment is simultaneously started and positioned according to the recalculated value.

[0007] Furthermore, S1 specifically includes: The roller conveyor group after the descaling box is designated as a pre-treatment waiting point through program control. Control the stop position of the steel billet at the waiting point to maintain a set safe distance from the preceding rolling mill table; Based on the elongation of the rolled steel billet in the roughing mill and the hot inspection signal, the operation of the waiting point roller table is dynamically controlled to prevent the steel billet from colliding.

[0008] By setting the roller conveyor group after the descaling box as the pre-treatment waiting point, the conveying distance of the billet from the waiting point to the roughing mill inlet is significantly shortened, thereby reducing conveying time and improving the continuity of the rolling rhythm. By setting a safe stop position and dynamically controlling the operation of the roller conveyor based on the extension length of the rolled billet and the heat detection signal, collisions or stacking of billets between the front and rear are effectively prevented, ensuring production safety and material tracking stability.

[0009] Furthermore, the dynamic control of the waiting point roller conveyor includes: When the rolled steel billet enters the first threshold of the waiting point area, the waiting point roller conveyor remains stationary; When the rolled steel billet enters the waiting point area and exceeds the first threshold, the waiting point roller conveyor is controlled to drive the waiting steel billet backward in order to maintain a safe distance between the two steel billets.

[0010] Based on the different situations of the rolled steel billet entering the waiting point area, the operation status of the waiting point roller conveyor is dynamically controlled to realize the real-time adjustment of the safety distance, avoid the billet from accidentally moving forward or colliding due to roller conveyor malfunction, and further improve production safety and the accuracy of automated control.

[0011] Furthermore, the steel transfer operation is achieved through the modified waiting point roller conveyor, specifically as follows: The flat rollers in the waiting area were replaced with staggered conical rollers; Two sets of transmission devices are configured to control the tapered rollers on both sides of the roller conveyor. By operating the control joystick to output a reverse speed command, the two sets of transmission devices are driven to make the conical rollers on both sides of the roller conveyor rotate in opposite directions, thereby causing the steel billet to rotate.

[0012] By transforming the waiting point flat rolls into staggered conical rolls and configuring two independently controlled transmission devices, the billet can complete the steel transfer operation at the waiting point. This moves the traditional steel transfer process at the roughing mill inlet forward, eliminates the time occupied by the steel transfer process on the roughing mill operation, and further improves the utilization rate of the roughing mill.

[0013] Furthermore, during the billet transport stage, the speed curves of the two sets of transmission devices are matched in real time, and the device parameters are adjusted to make the speed and acceleration of the roller conveyors on both sides consistent.

[0014] By matching the speed and acceleration of the transmission devices on both sides in real time, the roller conveyor is ensured to operate synchronously during the steel transfer process, which effectively prevents the steel billet from deviating or deviating in position during rotation, improves the accuracy and efficiency of steel transfer, and reduces the time loss caused by the increase in the number of adjustments.

[0015] Furthermore, the automatic alignment operation is accomplished using a side guide plate alignment device, the control process of which includes: The two side guide plates are driven to move toward each other in position control mode until they contact the steel billet. When the contact force is detected to reach the second threshold, the system switches to force control mode to stabilize the clamping force of the side guide plates on the steel billet at the set value. After holding the position for a set time in force control mode, the actual width of the billet is calculated based on the current position of the side guide plates on both sides. Based on the calculated billet width, the control side guide plate pushes the billet to the center line of the roller conveyor.

[0016] By installing a side guide plate centering device at the waiting point, automatic centering and width measurement of the billet after steel transfer can be achieved. This moves the centering process at the original roughing mill inlet forward, further reducing the non-rolling waiting time of the roughing mill, while improving the timeliness and accuracy of width measurement data, providing a reliable basis for subsequent pass table calculations.

[0017] Furthermore, the side guide plate is controlled by a PI cascade control method that switches between position control and force control, with position control being the outer loop and force control being the inner loop.

[0018] A PI cascade control strategy with dual-mode switching of position control and force control is adopted to achieve smooth and precise control of the side guide plate movement. This ensures both rapid positioning and stable clamping during the centering process, avoiding billet position fluctuations or surface damage caused by unstable control switching, and improving the reliability and process quality of the centering process.

[0019] Secondly, the present invention also provides a computer terminal, comprising: Memory, which stores executable programs; A processor is configured to run the program, wherein the program executes the pretreatment control method prior to rough rolling.

[0020] Thirdly, the present invention also provides a computer-readable storage medium comprising a stored executable program, wherein, when the executable program is executed, it controls the device where the computer-readable storage medium is located to perform the pretreatment control method before rough rolling.

[0021] Fourthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the pretreatment control method before rough rolling.

[0022] Compared with existing technologies, the beneficial effects of this invention are as follows: By establishing a dedicated pretreatment waiting point before roughing, key processes such as steel transfer, centering, width measurement, and model recalculation are moved to this waiting point, achieving efficient connection and parallel control between the pretreatment stage and the rolling process. This method not only significantly shortens the non-rolling waiting time of the roughing mill and improves the continuity and production efficiency of the rolling line, but also simultaneously enhances production safety, process automation, and parameter measurement accuracy through integrated control methods such as dynamic roller table control, conical roll steel transfer, and dual-mode centering, thereby providing systematic support for the stable, efficient, and coordinated operation of roughing and subsequent processes. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a diagram showing the equipment layout for the pretreatment process before rough rolling; Figure 2 This is a flowchart of the pretreatment control method before rough rolling. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments provided by this invention without inventive effort are within the scope of protection of this invention.

[0026] This invention provides a pretreatment control method before rough rolling, specifically including: S1, a pretreatment waiting point is set up in the roller table area between the descaling box and the roughing mill, and the billet is transported to the waiting point.

[0027] like Figure 1 As shown, two sets of rolling rollers are provided between the roughing mill and the descaling box, with the roller set after the descaling box only partially occupied when rolling long plates. This invention makes full use of this roller set, designating it as a pre-treatment control area and setting it as a new buffer waiting point. This shortens the transport distance of the billet from the waiting point to the roughing mill entrance, and also reserves space and time windows for billet transfer, alignment, and other operations during the waiting period. Furthermore, by setting two waiting points before and after the descaling box, a double-discharge production mode for the heating furnace can be realized, allowing two slabs to be transported to two separate waiting points, thereby improving the charging efficiency of the heating furnace.

[0028] Furthermore, to prevent the steel billets being rolled in the roughing mill from extending too far in subsequent passes and entering the waiting point roller conveyor, causing collisions between the two billets, stacking, or abnormal material tracking, this invention designs a safety control logic for this waiting point to ensure a safe distance between the two billets and system interlock control, specifically including: 1) After the billet is conveyed to the waiting point, the stop position should maintain a distance of 2 meters from the E2 hot inspection station located between the E2 and E3 steel transfer rollers to ensure a safe interval with the previous set of rollers. 2) Based on the real-time calculation of the slab extension length in the roughing mill and the detection status of the E2 hot inspection signal, the waiting point roller conveyor is dynamically controlled: when the rolled steel billet enters the waiting point area within 0.5 meters, the waiting point roller conveyor does not rotate in the opposite direction with the rolling roller conveyor; when it exceeds 0.5 meters, the waiting point steel billet is controlled to retreat a corresponding distance with the rolled steel billet to ensure a safe distance between the two steel billets; in other cases, the waiting point roller conveyor remains stationary to avoid the roller conveyor from moving forward due to accidental movement, and to prevent the two steel billets from approaching each other and causing an accident. 3) During the transport process, the actual position of the billet is corrected in real time through dual signal calibration of E1 thermal detection and E2 thermal detection to ensure accurate material tracking and avoid abnormalities.

[0029] S2, at the waiting point, the billet is transferred to another steel, its rolling direction is adjusted, the transferred billet is automatically centered, and the width of the billet is measured during the centered process.

[0030] After setting up a waiting point after the descaling box, in order to move the steel transfer process forward to this location, the roller conveyor group at the waiting point needs structural modification and transmission control design. The specific implementation is as follows: The original flat rolls, used for transport and rolling at regular intervals, were replaced with longer, closely spaced, and staggered tapered rolls. These tapered rolls are located on both sides of the roller conveyor, and two sets of drive frequency converters independently control the tapered rolls on each side. Both sets of drive frequency converters communicate with the DCS controller to achieve independent speed and direction control of the roller conveyors on both sides. When the two sets of roller conveyors operate in the same direction, they transport and roll the steel billet; when they operate in opposite directions, they drive the steel billet to rotate, completing the steel transfer.

[0031] The original manual operating lever at the roughing mill inlet was functionally modified so that it could output reverse speed commands through up and down movements, thereby controlling the rotation direction of the frequency converters of the roller conveyor on both sides of the waiting point, and realizing reliable operation of billet transfer.

[0032] In addition, during the billet conveying stage, the speed and acceleration curves of the two sets of transmission frequency converters are matched in real time, and the parameters are adjusted to ensure that the roller conveyors on both sides operate synchronously, preventing the billet from deviating during transmission.

[0033] A side guide plate alignment device is installed on both sides of the steel transfer roller conveyor at the waiting point. In this device, each side guide plate is driven by two hydraulic cylinders to move the push plate back and forth. The two cylinders on the same side are kept in sync by a mechanical synchronous shaft, while the synchronization between the two side guide plates is controlled by a program and adjusted according to the deviation between the given value and the actual position.

[0034] The movement of the side guide plate employs closed-loop control: a displacement sensor mounted on the hydraulic cylinder detects the position, a pressure sensor on the hydraulic valve platform detects the contact force, and then a servo valve achieves precise control. The centering process includes both position control and force control modes, employing position control... A dual-variable PI cascade control method for pressure (outer loop for position control, inner loop for pressure control) is used to achieve smooth and continuous control switching between the two modes.

[0035] S3 sends the measured billet width to the secondary control system, triggers the secondary model to recalculate the pass order table, feeds back the recalculated pass order table information to the primary control system, and temporarily stores it in the NEXT buffer.

[0036] S4, during the process of the billet being conveyed from the waiting point to the roughing mill inlet, the rolling mill equipment is simultaneously started and positioned according to the recalculated value.

[0037] As the billet is conveyed from the pretreatment waiting point to the roughing mill entrance, the primary control system writes the pass number information from the NEXT buffer into the current buffer. Once the rolling force signal of the previous billet disappears, the relevant mill equipment is immediately started synchronously, and positioning is performed based on the recalculated values.

[0038] The control flow of this method is described in conjunction with the complete process sequence, such as... Figure 2 As shown: After the billet exits the heating furnace, the transfer sequence is triggered. If the roughing mill is in a blank state (i.e., the first billet to be rolled), the billet will be directly sent to the roughing mill inlet, where it will sequentially complete operations such as steel transfer, centering, width measurement, model recalculation, and equipment positioning, and then rolling will begin.

[0039] If a billet is already being rolled in the roughing mill, it is automatically conveyed to the pre-treatment waiting point after the descaling box, where it undergoes initial surface descaling. Once the billet reaches the waiting point, it stops and maintains a set safe distance from the preceding rolling mill. At this point, the operator is prompted to control the reverse rotation of the two sides of the transfer rollers via a joystick, thus transferring the billet to the next rolling mill and adjusting its rolling direction.

[0040] After the steel transfer is completed and the roller conveyor stops rotating, the automatic centering and width measurement process of the side guide plate is triggered. The process is as follows: The side guide plates move toward each other in a position control mode at a minimum given width until they contact the steel billet; When the contact force between the side guide plates and the billet on both sides reaches the second threshold, the system switches to force control mode and sets the target clamping force to 250kN. The clamping force is then adjusted by the servo valve to stabilize within the range of 250kN±10kN. When the position change per second is less than 5mm and the force is held for 0.5 seconds, the actual width of the billet is calculated based on the current position of the side guide plates on both sides and saved as the centering width. Set half of the centering width as the new position setting value, switch back to position control mode, and drive the side guide plate to push the billet to the center position of the roller table; After centering is completed, the side guide plate is opened to its maximum width to await the next steel billet.

[0041] The measured centering width is sent to the secondary control system, triggering the recalculation of the pass order table. The calculation result is then fed back to the primary control system and temporarily stored in the NEXT buffer. The pre-processed billet continues to wait at the waiting point. During this time, dynamic interlocking control is achieved through material tracking, thermal detection signals, and secondary model calculations to ensure a safe distance from the rolled billet: when only a small portion of the rolled billet enters the pre-processing roller conveyor area, the waiting point roller conveyor remains stationary; when its entry length exceeds the first threshold, the waiting point billet automatically retreats, thereby avoiding collisions and material tracking anomalies.

[0042] When the rolled billet completes its final pass and leaves the roughing mill inlet area, the billet at the pre-processing waiting point begins to be fed towards the roughing mill inlet. Once the roughing mill's steel-bearing signal disappears, the system writes the pass list from the NEXT buffer into the current buffer and simultaneously starts the mill equipment to position itself according to that pass list. After positioning is complete, the rolling sequence is immediately triggered.

[0043] It should be noted that the present invention is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments that have the same structure and perform the same effects as the technical concept within the scope of the present invention are included within the scope of the present invention. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of the present invention, are also included within the scope of the present invention.

Claims

1. A pretreatment control method before rough rolling, characterized in that, include: S1, a pretreatment waiting point is set up in the roller table area between the descaling box and the roughing mill, and the steel billet is transported to the waiting point; S2, at the waiting point, the billet is transferred to another steel, its rolling direction is adjusted, the transferred billet is automatically centered, and the width of the billet is measured during the centered process; S3 sends the measured billet width to the secondary control system, triggers the secondary model to recalculate the pass order table, and stores the recalculated pass order table information in the buffer. S4, during the process of the billet being conveyed from the waiting point to the roughing mill inlet, the rolling mill equipment is simultaneously started and positioned according to the recalculated value.

2. The pretreatment control method before rough rolling according to claim 1, characterized in that, S1 specifically includes: The roller conveyor group after the descaling box is set as a pre-treatment waiting point through program control. Control the stop position of the steel billet at the waiting point to maintain a set safe distance from the preceding rolling mill table; Based on the elongation of the rolled steel billet in the roughing mill and the hot inspection signal, the operation of the waiting point roller table is dynamically controlled to prevent the steel billet from colliding.

3. The pretreatment control method before rough rolling according to claim 2, characterized in that, The dynamic control of the waiting point roller conveyor includes: When the rolled steel billet enters the first threshold of the waiting point area, the waiting point roller conveyor remains stationary; When the rolled steel billet enters the waiting point area and exceeds the first threshold, the waiting point roller conveyor is controlled to drive the waiting steel billet backward in order to maintain a safe distance between the two steel billets.

4. The pretreatment control method before rough rolling according to claim 1, characterized in that, The steel transfer operation is achieved through the modified waiting point roller conveyor, specifically as follows: The flat rollers in the waiting area were replaced with staggered conical rollers; Two sets of transmission devices are configured to control the tapered rollers on both sides of the roller conveyor. By operating the control joystick to output a reverse speed command, the two sets of transmission devices are driven to make the conical rollers on both sides of the roller conveyor rotate in opposite directions, thereby causing the steel billet to rotate.

5. The pretreatment control method before rough rolling according to claim 4, characterized in that, During the billet transport stage, the speed curves of the two sets of transmission devices are matched in real time, and the device parameters are adjusted to make the speed and acceleration of the roller conveyors on both sides consistent.

6. The pretreatment control method before rough rolling according to claim 1, characterized in that, The automatic centering operation is accomplished using a side guide plate centering device, and its control process includes: The two side guide plates are driven to move toward each other in position control mode until they contact the steel billet; When the contact force is detected to reach the second threshold, the system switches to force control mode to stabilize the clamping force of the side guide plates on the steel billet at the set value. After holding the position for a set time in force control mode, the actual width of the billet is calculated based on the current position of the side guide plates on both sides. Based on the calculated billet width, the control side guide plate pushes the billet to the center line of the roller conveyor.

7. The pretreatment control method before rough rolling according to claim 6, characterized in that, The side guide plate is controlled by a PI cascade control method that switches between position control and force control, with position control as the outer loop and force control as the inner loop.

8. A computer terminal, characterized in that, include: Memory, which stores executable programs; A processor for running the program, wherein the program, when running, performs the method according to any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored executable program, wherein, when the executable program is executed, it controls the device on which the computer-readable storage medium is located to perform the method of any one of claims 1 to 7.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method of any one of claims 1 to 7.

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