A monitoring method, monitoring device, monitoring equipment, and readable storage medium.

Abstract

This application discloses a monitoring method, monitoring device, monitoring equipment, and readable storage medium for use in a slab hot rolling system. The slab hot rolling system includes a roughing mill and a heating furnace. The monitoring method includes acquiring the length information of the slab to be processed; dividing the slab into multiple monitoring zones based on the length information; acquiring the instantaneous rolling force of the slab during the first pass of the roughing mill; calculating the rolling force of each monitoring zone based on the instantaneous rolling force of the slab; setting any one rolling force as a reference rolling force; setting the monitoring zone corresponding to the reference rolling force as a reference monitoring zone; calculating the change ratio of the rolling force of the first monitoring zone relative to the reference rolling force; the first monitoring zone being any monitoring zone other than the reference monitoring zone among the multiple monitoring zones; and generating temperature uniformity information of the rolled slab heated in the heating furnace based on each change ratio. According to the embodiments of this application, the temperature uniformity of the slab can be monitored more accurately.

Description

Technical Field

[0001] This application belongs to the field of steel rolling technology and relates to a monitoring method, monitoring device, monitoring equipment and readable storage medium. Background Technology

[0002] Using continuously cast slabs as raw material, the slabs are heated in a furnace on a conventional hot rolling line and then rolled into hot-rolled coils through roughing and finishing rolling. These hot-rolled coils are then rough-straightened, sheared, and fine-straightened on a leveling line to produce hot-rolled plates. This is currently the main mode of producing hot-rolled steel plates. In the slab hot rolling production line, the uniformity of slab heating temperature is crucial to ensuring the quality of the hot-rolled coils. Poor slab temperature uniformity will reduce the uniformity of mechanical properties along the length of the hot-rolled coil and may lead to rolling accidents. Before rolling, the slab is usually heated in a furnace. Due to the influence of the flame length, slag accumulation in the furnace, and water beams (support beams), the uniformity of slab temperature is difficult to control. Furthermore, iron oxide scale forms on the surface of the slab after heating, making it difficult to accurately measure the slab temperature. Summary of the Invention

[0003] This application provides a monitoring method, monitoring device, monitoring equipment, and readable storage medium, which can more accurately monitor the uniformity of slab temperature, reduce or avoid the mechanical property defects of hot-rolled steel coils caused by uneven slab temperature, and reduce or avoid rolling failures caused by poor slab temperature uniformity.

[0004] The first aspect of this application provides a method for monitoring the longitudinal temperature uniformity of a slab during hot rolling, applied to a slab hot rolling system. The slab hot rolling system equipment mainly includes a heating furnace, a descaling mill, a roughing mill, and a finishing mill. After being heated and descaled in the heating furnace, the slab enters the roughing mill for rolling. The first pass of the roughing mill rolls the slab at a uniform speed. The monitoring method includes:

[0005] Obtain the length information of the slab to be processed, and divide the slab to be processed into multiple monitoring areas based on the length information;

[0006] The instantaneous rolling force of the slab during the first pass of roughing rolling is obtained, and the rolling force applied by the roughing mill to each monitoring zone is calculated based on the instantaneous rolling force of the slab.

[0007] Set any one of the rolling forces as the reference rolling force, and set the monitoring area corresponding to the reference rolling force as the reference monitoring area. Calculate the change ratio of the rolling force corresponding to the first monitoring area relative to the reference rolling force. The first monitoring area is any monitoring area other than the reference monitoring area among the plurality of monitoring areas.

[0008] After the first rough rolling, temperature uniformity information of the slab to be processed heated in the heating furnace is generated according to the various change ratios.

[0009] According to an embodiment of the first aspect of this application, setting any one rolling force as a reference rolling force includes:

[0010] The minimum rolling force in each monitoring zone is set as the reference rolling force.

[0011] According to any of the foregoing embodiments of the first aspect of this application, generating temperature uniformity information of the slab to be processed heated by the heating furnace based on each of the aforementioned variation ratios includes:

[0012] If at least one of the change ratios corresponding to each of the first monitoring zones is greater than a preset parameter, information is generated indicating that the temperature uniformity of the heating furnace heating the slab to be processed is unqualified.

[0013] When the change ratio corresponding to each of the first monitoring zones is not greater than the preset parameter, information is generated indicating that the temperature uniformity of the heating furnace heating the slab to be processed is qualified.

[0014] According to any of the foregoing embodiments of the first aspect of this application, the length information of the slab to be processed is obtained, and the slab to be processed is divided into multiple monitoring zones based on the length information, including:

[0015] Obtain the length value of the slab to be processed;

[0016] Based on the length value, the slab to be processed is divided into an unsteady region and a steady region. The unsteady region is located on one side of the steady region along the length direction of the slab to be processed.

[0017] The steady-state region is divided into multiple monitoring zones set sequentially along the length direction.

[0018] According to any of the foregoing embodiments of the first aspect of this application, along the length direction of the slab to be processed, the length of each unsteady zone is 5% to 10% of the length value, and the length of the monitoring zone is 1% to 6% of the length value.

[0019] A second aspect of this application provides a monitoring device, which includes a first acquisition module, a division module, a second acquisition module, a first calculation module, a second calculation module, and a judgment module. The first acquisition module acquires the length information of the slab to be processed; the division module divides the slab into multiple monitoring zones based on the length information; the second acquisition module acquires the instantaneous rolling force of the slab during the first pass of the roughing mill; the first calculation module calculates the rolling force applied by the mill to each monitoring zone based on the instantaneous rolling force of the slab; the second calculation module calculates the change ratio of the rolling force corresponding to the first monitoring zone relative to the reference rolling force, where the reference rolling force is any rolling force, and the multiple monitoring zones include the first monitoring zone and the monitoring zone corresponding to the reference rolling force; the judgment module generates temperature uniformity information of the slab that has been heated and rolled in the furnace based on each change ratio.

[0020] A third aspect of this application provides a monitoring device, which includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the monitoring method for hot rolling of slabs as described in any of the first aspects of the embodiments above.

[0021] The fourth aspect of this application provides a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of the monitoring method for hot rolling of slabs as described in any of the first aspects of the present application.

[0022] The method, device, equipment, and readable storage medium for monitoring the longitudinal temperature uniformity of hot-rolled slabs according to embodiments of this application divide the slab to be processed into multiple monitoring zones. During the rolling process, the instantaneous rolling force of the slab during the first pass of the roughing mill is acquired, and the rolling force applied to each monitoring zone is calculated. The change ratio of other rolling forces is calculated using any one of these rolling forces as a benchmark. Since the slab temperature has a significant impact on the magnitude of the rolling force, information on the temperature uniformity of the slab to be processed can be obtained based on the change ratio of the rolling force. According to the method provided in this application, the uniformity of slab temperature can be monitored more accurately, reducing or avoiding performance and thickness inconsistencies in the length direction of hot-rolled coils caused by slab temperature inconsistencies, and reducing or avoiding rolling failures caused by slab temperature inconsistencies. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1This is a flowchart illustrating a monitoring method according to an embodiment of the first aspect of this application;

[0025] Figure 2 This is a schematic diagram of the structure of a monitoring device according to a second aspect embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the structure of a monitoring device according to a third aspect of this application. Detailed Implementation

[0027] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0028] In a slab hot rolling production line, slab temperature uniformity is crucial for ensuring the quality of hot-rolled coils. Poor slab temperature uniformity will reduce the thickness uniformity and mechanical property uniformity along the length of the hot-rolled coil, and may even lead to mill malfunctions, such as rolling force exceeding the upper limit and causing a shutdown.

[0029] Before rolling slabs, they are typically heated in a furnace. However, the uniformity of slab temperature is difficult to control due to factors such as the length of the flame, slag buildup, and water jets within the furnace. Furthermore, the formation of iron oxide scale on the slab surface after heating makes accurate temperature measurement challenging.

[0030] To address the problems of the prior art, embodiments of this application provide a monitoring method, a monitoring device, a monitoring equipment, and a readable storage medium. The monitoring method, monitoring device, monitoring equipment, and readable storage medium provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0031] Please refer to Figure 1 The first aspect of this application provides a method for monitoring the temperature uniformity of hot-rolled slabs, which is applied to a slab hot rolling system. The slab hot rolling system includes a roughing mill and a heating furnace, and the roughing mill rolls the slab at a uniform speed in the first pass.

[0032] The slab hot rolling system may also include a descaling mill, a finishing mill, and a coiler. The roughing mill rolls the slab into intermediate slabs, the finishing mill rolls the intermediate slabs into strip steel, and the coiler coils the strip steel into coils. The slab undergoes plastic deformation through the rotation and extrusion of the mill rolls. In this application, the mill should be a hot rolling mill, which can be a two-high, four-high, or six-high mill, etc., and this application is not limited to any particular type. A heating furnace is used to heat the slab before it is rolled by the mill, making the slab easier to plastically deform. The heating furnace is equipped with multiple burners for heating the slab. This monitoring method is applied to the first pass of the roughing mill, where the first pass is a constant-speed rolling process.

[0033] The monitoring method for hot rolling of slabs provided in this application can be applied to the above-mentioned hot rolling system for slabs. The monitoring method includes the following steps:

[0034] S1. Obtain the length information of the slab to be processed, and divide the slab to be processed into multiple monitoring areas based on the length information;

[0035] The length information of the slab to be processed can be pre-stored in the database of the slab hot rolling system and retrieved directly from the database during slab rolling. Alternatively, it can be obtained through detection equipment such as cameras and sensors. The slab to be processed can be divided into multiple monitoring zones based on the length value. These monitoring zones can be arranged sequentially or in an array. The sizes of the multiple monitoring zones can be the same or different.

[0036] S2. Obtain the instantaneous rolling force of the slab during the first pass of rough rolling, and calculate the rolling force applied by the mill to each of the monitoring zones based on the instantaneous rolling force of the slab.

[0037] It should be understood that under constant-speed rolling conditions, the change in rolling force during the rolling process of a slab is mainly affected by the slab temperature. For example, if the temperature at half the length of the slab is lower than that at quarter the length, the rolling force at half the length will be higher than that at quarter the length. It should also be understood that the rolling force corresponding to each monitoring zone can be the average rolling force applied by the mill to each monitoring zone during the rolling process. The average rolling force is calculated based on the instantaneous rolling force.

[0038] S3. Set any rolling force as the reference rolling force, and set the monitoring area corresponding to the reference rolling force as the reference monitoring area. Calculate the change ratio of the rolling force corresponding to the first monitoring area relative to the reference rolling force. The first monitoring area is any monitoring area other than the reference monitoring area among multiple monitoring areas.

[0039] To calculate the change ratio of the rolling force relative to the reference rolling force for any first monitoring zone, first calculate the difference between the rolling force for the first monitoring zone and the reference rolling force, then calculate the ratio of this difference to the reference rolling force. This ratio is the change ratio. It should be understood that when the rolling force in the first monitoring zone is greater than the reference rolling force, the change ratio for the first monitoring zone is positive; when the rolling force in the first monitoring zone is less than the reference rolling force, the change ratio for the first monitoring zone is negative.

[0040] S4. Generate temperature uniformity information for the rolled slab heated in the furnace based on each variation ratio. With a constant rolling speed, the higher the slab temperature, the lower the slab's deformation resistance. Therefore, in areas of higher slab temperature, the rolling force required during slab rolling is lower, and in areas of lower temperature, the rolling force required is higher. Thus, the variation in the rolling force applied to the slab by the mill during the rolling process reflects the variation in slab temperature.

[0041] To further determine the extent of the impact of temperature changes on rolling force, calculations were performed on slabs containing carbon, manganese, and chromium based on the S. Ekelund formula, as shown below:

[0042] p = (1 + m)(k + ηε);

[0043]

[0044] f = a(1.05 - 0.0005t);

[0045]

[0046] k=(14-0.01t)(1.4+C+Mn+0.3Cr), ×10Mpa;

[0047] η=0.01ξ(14-0.01t),×10Mpa·s;

[0048]

[0049] In the above formulas: p is the rolling pressure; m is the coefficient of influence of external friction on unit pressure; k is a coefficient related to the composition of the slab; η is the viscosity coefficient; ε is the average deformation speed of the slab; Δh is the difference between the thickness of the slab at the inlet end and the thickness of the slab at the outlet end; R is the roll radius; H is the thickness of the slab at the inlet end; h is the thickness of the slab at the outlet end; a is the roll coefficient, for example, the roll coefficient a of cast iron rolls is 0.8, and the roll coefficient a of steel rolls is 1.0; t is the temperature of the slab; v is the rolling speed; C is the carbon content; Mn is the manganese content; Cr is the chromium content; ξ is the rolling speed coefficient, for example, it is 1 when the rolling speed is <6m / s; B1 is the width of the slab at the inlet end; B2 is the width of the slab at the outlet end; F is the rolling force, the inlet end of the slab is the end of the slab that first enters the rolling mill, and the outlet end of the slab is the end of the slab that last enters the rolling mill.

[0050] For example, the roll radius R is 600 mm, the width B1 at the slab inlet is 2000 mm, the thickness H at the slab inlet is 240 mm, the rolling speed v is 2500 mm / s, the thickness h at the slab outlet is 190 mm, the width B2 at the slab outlet is 2020 mm, and the C content, Mn content, and Cr content in the slab are 0.08%, 0.11%, and 0.2%, respectively.

[0051] Substitute the above parameters into S. Ekelund's formula for calculation:

[0052] f=a(1.05-0.0005t)=1.05-0.0005t

[0053]

[0054] k=(14-0.01t)(1.4+11+8+6)=26.4(14-0.01t)=369.6-0.264t;

[0055] η = 0.1(14 - 0.01t);

[0056]

[0057] p=(1+m)(k+ηε)=(1+0.53717-0.0003224t)(369.6-0.264t+3.3567×0.1×(14-0.01t))

[0058] =(1.53717-0.000322t)(374.29938-0.2673567t);

[0059]

[0060] F=348142.2(1.53717-0.000322t)(374.29938-0.2673567t);

[0061] Based on the above calculations, it can be concluded that the rolling force F changes with the slab temperature t.

[0062] Based on the above formulas, the rolling pressure and rolling force are calculated for slab temperatures t of 1200℃, 1190℃, 1180℃, 1170℃, 1160℃, and 1150℃, respectively. The variation ratio is calculated using the rolling force corresponding to a slab at 1200℃ as the reference rolling force. The variation ratio is the ratio of the change in rolling force to the reference rolling force, and the change in rolling force is the difference between the rolling force and the reference rolling force. The specific calculation results are shown in Table 1 below:

[0063] Table 1

[0064] Slab temperature (°C) 1200 1190 1180 1170 1160 1150 Rolling pressure (MPa) 61.533 64.791 68.065 71.357 74.666 77.993 Rolling force (kN) 21422 22556 23696 24842 25994 27153 Change ratio (%) 0.00 5.29 10.62 15.96 21.34 26.75

[0065] To further illustrate the calculations, the rolling pressure and rolling force were calculated for slab temperatures t of 1250℃, 1240℃, 1230℃, 1220℃, 1210℃, and 1200℃, respectively. The variation ratio was calculated using the rolling force corresponding to the slab at 1250℃ as the baseline rolling force. The specific calculation results are shown in Table 2 below:

[0066] Table 2

[0067] Slab temperature (°C) 1250 1240 1230 1220 1210 1200 Rolling pressure (MPa) 45.504 48.676 51.864 55.070 58.293 61.533 Rolling force (kN) 15842 16946 18056 19172 20294 21422 Change ratio (%) 0.00 6.97 13.98 21.02 28.10 35.22

[0068] Based on the data in Tables 1 and 2, it can be seen that the rolling force is negatively correlated with the slab temperature; for every 10°C decrease in slab temperature, the change is greater than 5%. Furthermore, according to YB / T-2000 "High-Quality Carbon Steel and Alloy Steel Continuously Cast Slabs," the width wedge of the slab should be ≤10mm, meaning the width change of a 1000mm slab should be ≤1%, resulting in a rolling force change of ≤1% due to width variation. For a 2000mm slab, the rolling force change due to width variation should be ≤0.5%, and the thickness along the length of the slab should not change significantly, meaning the effect of thickness variation on rolling force can be completely ignored. Therefore, the rolling force applied to the slab by the mill during slab rolling is sufficiently sensitive to temperature. Thus, the temperature variation in different areas of the slab can be monitored by observing the changes in the rolling force applied by the mill, thereby determining the uniformity of the slab temperature.

[0069] Based on the above analysis, after dividing a slab into multiple monitoring zones, any one of the rolling forces corresponding to each monitoring zone is taken as the reference rolling force, and the corresponding monitoring zone is taken as the reference monitoring zone. The greater the change ratio of the first rolling force corresponding to the first monitoring zone relative to the reference rolling force, the greater the temperature change ratio of the first monitoring zone relative to the reference monitoring zone. Thus, the temperature change of each first monitoring zone relative to the reference monitoring zone can be obtained.

[0070] The slab hot rolling monitoring method of this application divides the slab to be processed into multiple monitoring zones. During the rolling process, the instantaneous rolling force of the slab in each monitoring zone during the first pass of roughing is obtained. The rolling force applied to each monitoring zone is then calculated, and the change ratio of other rolling forces is calculated based on any one of these rolling forces. Since the slab temperature significantly affects the rolling force, information about the temperature uniformity of the slab to be processed can be obtained from the change ratio of the rolling force. According to the method provided in this application, the uniformity of slab temperature can be monitored more accurately, reducing or avoiding performance and thickness inconsistencies in the length direction of hot-rolled coils caused by slab temperature inconsistencies, and reducing or avoiding mill failures caused by slab temperature inconsistencies.

[0071] In some embodiments, setting any one rolling force as a reference rolling force includes setting the minimum of all rolling forces as the reference rolling force.

[0072] Using the minimum rolling force as the reference rolling force and the corresponding monitoring area as the reference monitoring area, the calculated change ratio of the rolling force in the first monitoring area relative to the reference rolling force will all be positive. Setting the minimum value among all rolling forces as the reference rolling force involves comparing the magnitudes of each rolling force, which can be done pairwise. The smaller value is then compared with other rolling forces. This step is repeated until the magnitudes of all rolling forces have been compared, and the minimum value is set as the reference rolling force.

[0073] In some embodiments, S4 includes:

[0074] If at least one of the change ratios corresponding to each of the first monitoring zones is greater than a preset parameter, information is generated indicating that the temperature uniformity of the heating furnace heating the slab to be processed is unqualified.

[0075] When the change ratio corresponding to each of the first monitoring zones is not greater than the preset parameter, information is generated indicating that the temperature uniformity of the heating furnace heating the slab to be processed is qualified.

[0076] After calculating the change ratio of the rolling force relative to the reference rolling force in each monitoring zone, the change ratio is compared with preset parameters. These preset parameters are pre-set values ​​stored in the slab hot rolling system. The preset parameters are determined based on the temperature uniformity required by the actual processing conditions; optionally, the preset parameter is 5%.

[0077] For example, when the preset parameters are 5%, the roll radius is 600mm, and during the first pass of the slab roughing mill, the width of the slab on the inlet side of the roughing mill is 2000mm and the thickness is 240mm, the moving speed of the slab on the inlet side of the roughing mill is 2500mm / s, the thickness of the rolled piece on the outlet side of the roughing mill is 190mm and the width is 2020mm, and the C content, Mn content, and Cr content in the slab are 0.08%, 0.11%, and 0.2%, if the change ratio of the rolling force in the first monitoring zone relative to the reference rolling force is within 5%, then the temperature of the first monitoring zone is within 10℃ lower than the temperature of the reference monitoring zone; if the change ratio of the rolling force in the first monitoring zone relative to the reference rolling force is greater than 5%, then the temperature of the first monitoring zone is more than 10℃ lower than the temperature of the reference monitoring zone.

[0078] Therefore, to ensure the temperature uniformity of the entire slab to be processed, if the change ratio of the rolling force in each of the first monitoring zones relative to the reference rolling force is not greater than a preset parameter, the temperature uniformity of the slab is judged to be qualified; if at least one change ratio is greater than the preset parameter, the temperature uniformity of the slab to be processed is judged to be unqualified. It should be understood that the more monitoring zones the slab is divided into in S1, the more accurate the slab uniformity information obtained will be.

[0079] In some embodiments, S1 includes:

[0080] S11. Obtain the dimensional information of the blank to be processed, including the length value;

[0081] S12. Based on the length value, the slab to be processed is divided into an unsteady region and a steady region. The unsteady region is located on one side of the steady region along the length direction of the slab to be processed.

[0082] During the slab rolling process, the rolling at the ends of the slab is unsteady-state rolling, while the rolling in other areas outside the ends is steady-state rolling. The rolling force in unsteady-state rolling is affected by factors other than temperature. Therefore, monitoring the temperature uniformity of the slab by comparing the change in rolling force should exclude the unsteady-state rolling portion. Optionally, the unsteady-state region is located at both ends of the slab along its length, and the steady-state region is located between the two unsteady-state regions.

[0083] S13. Divide the steady-state region into multiple monitoring zones set sequentially along the length direction.

[0084] During the first pass of the roughing mill, when rolling at a constant speed, the rolling force in the steady-state region of the same slab is mainly affected by the slab temperature. The steady-state region is divided into multiple monitoring zones along its length. Optionally, each monitoring zone can have the same length.

[0085] In some embodiments, along the length of the slab to be processed, the length of each unstable region is 5% to 10% of the length value, and the length of the monitoring region is 1% to 6% of the length value. Optionally, there are two unstable regions located at both ends of the slab along its length. The length of the unstable region at the head end of the slab is 9% of the slab length value, and the length of the unstable region at the tail end of the slab is 7% of the slab length value. The length of the stable region is 84% ​​of the slab length value, and there are 14 monitoring regions, each with a length of 6% of the slab length value.

[0086] Please refer to Figure 2 The second aspect of this application provides a monitoring device 10, which includes a first acquisition module 11, a division module 12, a second acquisition module 13, a first calculation module 14, a second calculation module 16, and a judgment module 17. The first acquisition module 11 acquires the length information of the slab to be processed; the division module 12 divides the slab to be processed into multiple monitoring zones based on the length information; the second acquisition module 13 acquires the instantaneous rolling force of the slab during the first roughing pass of the rolling mill; the first calculation module 14 calculates the rolling force applied by the rolling mill to each monitoring zone based on the instantaneous rolling force of the slab; the second calculation module 15 calculates the change ratio of the rolling force corresponding to the first monitoring zone relative to the reference rolling force, where the reference rolling force is any rolling force, and the multiple monitoring zones include the first monitoring zone and the monitoring zone corresponding to the reference rolling force; the judgment module 16 generates temperature uniformity information of the heating furnace heating the slab to be processed based on each of the change ratios. Optionally, the first acquisition module 11, the division module 12, the second acquisition module 13, the first calculation module 14, the second calculation module 15, and the judgment module 16 are electrically connected in sequence.

[0087] The monitoring device in this application embodiment can be an integrated circuit or a chip, or it can be a device with an operating system. The operating system can be Android, iOS, or other possible operating systems; this application embodiment does not specifically limit the specific operating system. The monitoring device provided in this application embodiment can implement all the processes implemented in the method embodiment of the first aspect of this application; to avoid repetition, these processes will not be described again here.

[0088] Please refer to Figure 3The third aspect of this application provides a monitoring device 20, which includes a processor 21, a memory 22, and a program or instructions stored in the memory 22 and executable on the processor 21. When the program or instructions are executed by the processor 21, they implement the steps of the monitoring method for hot rolling of slabs as described in any of the first aspect embodiments above.

[0089] Specifically, the processor 21 may include a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0090] Memory 22 may include mass storage for data or instructions. For example, and not limitingly, memory 22 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 22 may include removable or non-removable (or fixed) media. Where appropriate, memory 22 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 22 is non-volatile solid-state memory.

[0091] In a particular embodiment, memory 22 includes read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0092] Memory 22 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Therefore, typically, memory 22 includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to one aspect of this disclosure.

[0093] The processor 21 implements any of the monitoring methods described in the above embodiments by reading and executing computer program instructions stored in the memory 22.

[0094] The fourth aspect of this application provides a readable storage medium on which a program or instructions are stored. When the program or instructions are executed by a processor, they implement the steps of the monitoring method for hot rolling of slabs as described in any of the first aspects of the present invention. To avoid repetition, these steps will not be repeated here.

[0095] To further illustrate the beneficial effects of the control method provided in this application, the following embodiments are provided.

[0096] The temperature uniformity of the slabs after heating in the three heating furnaces was monitored. Slab 1 was heated in furnace No. 1, slab 2 was heated in furnace No. 2, and slab 3 was heated in furnace No. 3. All three slabs were divided into 14 monitoring zones. The rolling force of each monitoring zone obtained by measurement and calculation is shown in Table 3.

[0097] Table 3: Rolling force (kN) in each monitoring zone of the slab

[0098]

[0099] Based on the rolling force data in Table 3, calculate the change ratio of rolling force in each monitoring zone.

[0100] Table 4: Ratio of rolling force to reference rolling force in each monitoring zone of the slab (%)

[0101]

[0102] Slab 1 was produced in heating furnace No. 1. The rolling force in monitoring zones 2 to 14 of the slab increased significantly, and the temperature in monitoring zones 2 to 14 was low. This may be because the iron oxide scale in the furnace is seriously accumulated, and the heat generated by the burner can no longer be transferred to the slab, resulting in the temperature in monitoring zones 2 to 14 of the slab being seriously low. The heating furnace needs to be repaired before it can be put back into production.

[0103] Slab 2 was produced in heating furnace No. 2. The furnace was in good condition, the temperature uniformity of the heated slab was good, and the heating quality of the slab met the requirements.

[0104] Slab 3 was produced in furnace No. 3. As shown in the table, the temperature in monitoring zones 1 to 6 is lower than in other zones. Monitoring zones 1 to 6 are heated by burners on the side of the furnace closest to the roughing mill. A significant portion of these burners are no longer usable and require furnace shutdown for maintenance. However, considering the better temperature uniformity in monitoring zones 7 to 14, meaning that most burners on the side of the furnace furthest from the roughing mill are usable and there is no severe iron oxide scale buildup in the furnace chamber, and given that furnace No. 1 needs to be shut down for maintenance, shutting down furnace No. 3 would severely impact production, measures such as appropriately extending the slab heating time in furnace No. 3 and appropriately reducing the number of burners on the side furthest from the roughing mill can be taken to ensure uniform slab heating temperature. Furnace No. 3 can be maintained after the maintenance of furnace No. 1 is completed.

[0105] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0106] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0107] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0108] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0109] The embodiments described above are not exhaustive, nor do they limit the invention to specific embodiments. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, enabling those skilled in the art to effectively utilize this application and its modifications. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and all such modifications or substitutions should be included within the scope of protection of this application.

Claims

1. A method for monitoring the temperature uniformity of hot-rolled slabs, the monitoring method being applied to a slab hot rolling system, the slab hot rolling system comprising a roughing mill and a heating furnace, wherein the roughing mill performs uniform speed rolling of the slab in the first pass, characterized in that, include: Obtain the length information of the slab to be processed, and divide the slab to be processed into multiple monitoring areas based on the length information; The instantaneous rolling force of the slab during the first pass of roughing rolling is obtained, and the rolling force applied by the roughing mill to each monitoring zone is calculated based on the instantaneous rolling force of the slab. Set any one of the rolling forces as the reference rolling force, and set the monitoring area corresponding to the reference rolling force as the reference monitoring area. Calculate the change ratio of the rolling force corresponding to the first monitoring area relative to the reference rolling force. The first monitoring area is any monitoring area other than the reference monitoring area among the plurality of monitoring areas. After the first rough rolling, temperature uniformity information of the slab to be processed heated in the heating furnace is generated according to the various change ratios. Specifically, setting any one of the rolling forces as a reference rolling force, and setting the monitoring area corresponding to the reference rolling force as a reference monitoring area, and calculating the change ratio of the rolling force corresponding to the first monitoring area relative to the reference rolling force, includes: The minimum value among the various rolling forces is set as the reference rolling force; The difference between the rolling force corresponding to the first monitoring zone and the reference rolling force is calculated respectively; Calculate the ratio of each difference to the reference rolling force to obtain the change ratio of the rolling force relative to the reference rolling force in the first monitoring zone; The step of obtaining the length information of the slab to be processed, and dividing the slab to be processed into multiple monitoring areas based on the length information, includes: Obtain the length value of the slab to be processed; Based on the length value, the slab to be processed is divided into an unstable region and a stable region, wherein the unstable region is located on one side of the stable region along the length direction of the slab to be processed; The steady-state region is divided into multiple monitoring zones arranged sequentially along the length direction.

2. The monitoring method according to claim 1, characterized in that, The step of generating temperature uniformity information for the slab to be processed heated in the furnace based on each of the aforementioned change ratios includes: If at least one of the change ratios corresponding to each of the first monitoring zones is greater than a preset parameter, information is generated indicating that the temperature uniformity of the heating furnace heating the slab to be processed is unqualified. When the change ratio corresponding to each of the first monitoring zones is not greater than the preset parameter, information is generated indicating that the temperature uniformity of the heating furnace heating the slab to be processed is qualified.

3. The monitoring method according to claim 1, characterized in that, Along the length direction of the slab to be processed, the length of each unsteady region is 5% to 10% of the length value, and the length of the monitoring region is 1% to 6% of the length value.

4. A monitoring device for monitoring the temperature uniformity of a hot-rolled slab, said slab being rolled by a roughing mill, characterized in that, The monitoring device includes: The first acquisition module is used to acquire the length information of the slab to be processed; A division module is used to divide the slab to be processed into multiple monitoring areas based on the length information; The second acquisition module is used to acquire the instantaneous rolling force of the slab during the first roughing pass of the rolling mill rolling the slab to be processed; The first calculation module is used to calculate the rolling force applied by the rolling mill to each of the monitoring zones based on the instantaneous rolling force of the slab; The second calculation module is used to calculate the change ratio of the rolling force corresponding to the first monitoring zone relative to the reference rolling force, wherein the reference rolling force is any one of the rolling forces, and the plurality of monitoring zones include the first monitoring zone and the monitoring zone corresponding to the reference rolling force; The judgment module is used to generate temperature uniformity information of the heating furnace heating the slab to be processed based on each of the said change ratios; The second calculation module is further configured to set the minimum value among the rolling forces as the reference rolling force; calculate the difference between the rolling force corresponding to the first monitoring zone and the reference rolling force; and calculate the ratio of each difference to the reference rolling force to obtain the change ratio of the rolling force corresponding to the first monitoring zone relative to the reference rolling force. The division module is also used to obtain the length value of the slab to be processed; divide the slab to be processed into an unsteady region and a steady region according to the length value, wherein the unsteady region is located on one side of the steady region along the length direction of the slab to be processed; and divide the steady region into a plurality of monitoring areas arranged sequentially along the length direction.

5. A monitoring device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein when the program or instructions are executed by the processor, they implement the steps of the monitoring method for hot rolling of slabs as described in any one of claims 1-3.

6. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the monitoring method for hot rolling of slabs as described in any one of claims 1-3.

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