Method, device and equipment for designing intermediate billet rolling scheme of wide and thick plate production line

Abstract

The invention provides an intermediate billet rolling scheme design method, device and equipment for a wide and thick plate production line, and relates to the technical field of intermediate billet rolling. The sum of the intermediate billet conveying time and the intermediate billet rolling time is used as intermediate billet processing time; if the intermediate billet cooling time is smaller than the intermediate billet processing time, the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance and the intermediate billet safety distance serves as the minimum roller way distance; a first intermediate billet rolling scheme is obtained according to the minimum roller way distance; and if the cooling time of the intermediate billet is greater than or equal to the processing time of the intermediate billet, comparing the sum of the current roller way distance, the minimum roller way distance and the length of the intermediate billet, and obtaining a second intermediate billet rolling scheme and a third intermediate billet rolling scheme according to the comparison result. The utilization rate of the rolling mill is improved on the premise that the intermediate billet is cooled in time.

Description

Technical Field

[0001] The present invention relates to the technical field of intermediate billet rolling, and in particular to a method, device and equipment for designing an intermediate billet rolling scheme for a wide and thick plate production line. Background Art

[0002] The distance between the roughing mill and the finishing mill of a wide and thick plate production line is usually determined according to the production line layout and process requirements. The intermediate billet obtained after the slab completes forming rolling and widening rolling on the roughing mill will not directly enter the finishing mill for finishing rolling, but will be kept warm and swung on the roller table between the roughing mill and the finishing mill for a period of time. When the temperature of the intermediate billet drops to the start rolling temperature of finishing rolling, it will enter the finishing mill for finishing rolling.

[0003] Existing intermediate bar rolling plans often rely on technicians' experience to determine the number of intermediate bars placed on the roller table. However, due to the limited length of the intermediate roller table, placing too many intermediate bars can lead to delayed cooling and possibly disrupt the rolling rhythm. Placing too few intermediate bars results in wasted production capacity and reduced mill utilization. Summary of the Invention

[0004] The present invention aims to solve at least one of the above problems.

[0005] In order to solve the above problems, the present invention provides a method, device and electronic equipment for designing an intermediate billet rolling scheme for a wide and thick plate production line.

[0006] In a first aspect, the present invention provides a method for designing an intermediate billet rolling scheme for a wide and heavy plate production line, comprising: Acquire time information and rolling information, wherein the time information includes intermediate billet cooling time, intermediate billet transportation time, and intermediate billet rolling time; and the rolling information includes intermediate billet length, plate length, roughing mill throwing distance, finishing mill throwing distance, and intermediate billet safety distance; The sum of the intermediate billet transportation time and the intermediate billet rolling time is used as the intermediate billet processing time; If the intermediate billet cooling time is less than the intermediate billet processing time, the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance and the intermediate billet safety distance is used as the minimum roller distance; Obtaining a first intermediate billet rolling plan according to the minimum roller distance; If the intermediate billet cooling time is greater than or equal to the intermediate billet processing time, comparing the current roller distance with the sum of the minimum roller distance and the intermediate billet length to obtain a comparison result; A second intermediate billet rolling plan and a third intermediate billet rolling plan are obtained based on the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length and the intermediate billet safety distance.

[0007] Optionally, obtaining a second intermediate billet rolling plan and a third intermediate billet rolling plan according to the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance includes: Obtaining the number of first intermediate billets according to the intermediate billet cooling time, the intermediate billet conveying time, and the intermediate billet rolling time; When the current roller distance is less than the sum of the minimum roller distance and the intermediate billet length, obtaining the second intermediate billet rolling plan according to the number of the first intermediate billets; When the current roller distance is greater than or equal to the sum of the minimum roller distance and the intermediate billet length, the number of second intermediate billets is obtained according to the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance; The third intermediate billet rolling plan is obtained according to the number of the first intermediate billets and the number of the second intermediate billets.

[0008] Optionally, obtaining the first number of intermediate billets according to the intermediate billet cooling time, the intermediate billet transportation time, and the intermediate billet rolling time includes: Obtaining the number of the first intermediate billets according to the intermediate billet cooling time, the intermediate billet conveying time, and the intermediate billet rolling time; Wherein, the number of the first intermediate billets includes: N1=INT((Δts-Δtt) / Δtf), Wherein, N1 is the number of the first intermediate billets, INT() is an integer sign, Δts is the cooling time of the intermediate billet, Δtt is the transportation time of the intermediate billet, and Δtf is the rolling time of the intermediate billet.

[0009] Optionally, obtaining the number of second intermediate billets according to the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance includes: Obtaining the second intermediate billet quantity according to the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance; Wherein, the number of the second intermediate billets includes: N2=INT((L- Lmin) / (L1+S)), Among them, N2 is the number of the second intermediate billets, INT() is the integer sign, L is the current roller distance, Lmin is the minimum roller distance, L1 is the length of the intermediate billet, and S is the safety distance of the intermediate billet.

[0010] Optionally, obtaining the third intermediate billet rolling plan according to the number of the first intermediate billets and the number of the second intermediate billets includes: Obtaining a target number of intermediate billets according to the number of the first intermediate billets and the number of the second intermediate billets; The target number of intermediate billets includes: N=MIN(N1, N2), Wherein, N is the target number of intermediate billets, MIN() is a symbol for taking the smaller value of N1 and N2, N1 is the number of the first intermediate billets, and N2 is the number of the second intermediate billets; The third intermediate billet rolling plan is obtained according to the target intermediate billet quantity.

[0011] Optionally, taking the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance and the intermediate billet safety distance as the minimum roller distance includes: The minimum roller distance is the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance, and the intermediate billet safety distance; Wherein, the minimum roller distance includes: Lmin=L1+L2+S+a1+a2, Among them, Lmin is the minimum roller distance, L1 is the length of the intermediate billet, L2 is the length of the plate, S is the safety distance of the intermediate billet, a1 is the steel throwing distance of the roughing mill, and a2 is the steel throwing distance of the finishing mill.

[0012] Optionally, the acquiring time information includes: Acquire a cooling mode, wherein the cooling mode includes an air cooling mode and a water cooling mode; The intermediate billet cooling time is obtained through the cooling mode.

[0013] In a second aspect, the present invention provides a device for designing an intermediate billet rolling plan for a wide and heavy plate production line, comprising: an information acquisition module for acquiring time information and rolling information, wherein the time information includes intermediate billet cooling time, intermediate billet transportation time, and intermediate billet rolling time; and the rolling information includes intermediate billet length, plate length, roughing mill throwing distance, finishing mill throwing distance, and intermediate billet safety distance; An intermediate billet processing time acquisition module, configured to take the sum of the intermediate billet transportation time and the intermediate billet rolling time as the intermediate billet processing time; a minimum roller distance acquisition module, configured to use the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance, and the intermediate billet safety distance as the minimum roller distance if the intermediate billet cooling time is less than the intermediate billet processing time; A first rolling plan acquisition module, configured to obtain a first intermediate billet rolling plan according to the minimum roller distance; a comparison module, configured to compare the current roller distance with the sum of the minimum roller distance and the intermediate billet length to obtain a comparison result if the intermediate billet cooling time is greater than or equal to the intermediate billet processing time; The second rolling plan acquisition module is used to obtain the second intermediate billet rolling plan and the third intermediate billet rolling plan based on the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length and the intermediate billet safety distance.

[0014] In a third aspect, the present invention provides an electronic device comprising a memory and a processor; The memory is used to store computer programs; The processor is used to implement the intermediate billet rolling plan design method for a wide and thick plate production line as described in the first aspect when executing the computer program.

[0015] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for designing an intermediate billet rolling scheme for a wide and thick plate production line as described in the first aspect is implemented.

[0016] The beneficial effects of the present invention's intermediate bar rolling plan design method, device, and electronic equipment for a wide and heavy plate production line include: comprehensive consideration of time information and rolling information, including the intermediate bar cooling time, intermediate bar transport time, and intermediate bar rolling time; and rolling information including the intermediate bar length, plate length, roughing mill steel throwing distance, finishing mill steel throwing distance, and intermediate bar safety distance, laying the foundation for subsequent plan design. The sum of the intermediate bar transport time and intermediate bar rolling time is used as the intermediate bar processing time. By calculating and comparing the intermediate bar cooling time and intermediate bar processing time, it is determined whether each intermediate bar needs to be held on the roller table for warming and swinging, thereby preventing high-temperature bars from entering the finishing mill due to insufficient cooling and ensuring that the intermediate bar temperature at the finishing entrance is within the optimal range. If the intermediate bar cooling time is less than the intermediate bar processing time, the minimum roller distance is calculated, and the first intermediate bar rolling plan is derived based on the minimum roller distance, ensuring that all intermediate bars can pass smoothly without steel blockage, thus avoiding unnecessary downtime and waiting time. If the intermediate bar cooling time is greater than or equal to the intermediate bar processing time, the current roller distance is further compared with the sum of the minimum roller distance and the intermediate bar length. Second and third intermediate bar rolling plans are then developed based on the specific situation. This allows the production line to adapt to changing operating conditions and improve mill utilization while ensuring timely intermediate bar cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a flow chart of a method for designing an intermediate billet rolling scheme for a wide and heavy plate production line according to an embodiment of the present invention; Figure 2 Schematic diagram of a wide and thick plate production line according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a device for designing a rolling scheme for an intermediate billet of a wide and heavy plate production line according to an embodiment of the present invention; Figure 4 The figure is a schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0020] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0021] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0022] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0023] In the related art, the layout of the wide and thick plate production line from the heating furnace to the rolling area includes a heating furnace, a high-pressure water descaling machine, a roughing mill, and a finishing mill. The slab is heated in the heating furnace. After being heated to the temperature set by the process, the steel tapping machine pulls the slab out of the heating furnace and onto the rolling line. The slab is then transported via rollers to the high-pressure water descaling machine for descaling, removing the iron oxide generated during the heating process, so that plates with excellent surface quality can be obtained in the subsequent rolling process. After the slab is descaled by high-pressure water, it is transported via rollers to the roughing mill. Forming rolling and widening rolling are carried out according to the process system. The starting rolling temperature, reduction per pass, and rolling speed of the roughing process are determined according to the set program. After the slab is rolled in the roughing mill, the intermediate slab is obtained, which is transported via rollers to the finishing mill for finishing rolling. The starting rolling temperature, reduction per pass, and rolling speed of the finishing rolling are determined according to the set program. The temperature of the intermediate bar transported to the finishing mill via rollers is usually higher than the start temperature of finishing rolling. Therefore, it does not enter the finishing mill directly for finishing rolling. Instead, it swings on the rollers between the roughing and finishing mills for a period of time until its temperature drops to the start temperature of finishing rolling before entering the finishing mill for finishing rolling. Because the intermediate bar cools down between the roughing and finishing mills through convection with the air and heat radiation from the intermediate bar in the air, the temperature reduction rate is slow and usually takes a long time. This swinging time is usually longer than the finishing rolling time of the intermediate bar in the finishing mill.

[0024] In response to the problems existing in the above-mentioned related technologies, this embodiment provides a method, device and equipment for designing an intermediate billet rolling scheme for a wide and thick plate production line.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a method for designing an intermediate billet rolling scheme for a wide and thick plate production line, comprising: Step 1100, obtaining time information and rolling information, wherein the time information includes intermediate billet cooling time, intermediate billet transportation time and intermediate billet rolling time, and the rolling information includes intermediate billet length, plate length, roughing mill throwing distance, finishing mill throwing distance and intermediate billet safety distance.

[0026] Specifically, combined Figure 2As shown in the figure, F´CE represents the heating furnace, HSB represents the high-pressure water descaling machine, R represents the roughing mill, and F represents the finishing mill. The heating furnace's primary function is to heat the continuously cast slab or ingot to a temperature suitable for rolling (usually 1150-1250°C) to improve the steel's plasticity and deformability and reduce its resistance to deformation. The high-pressure water descaling machine is used to remove the oxide scale (also known as "scale") from the slab surface before hot rolling. If not removed promptly, this scale can affect the surface quality and dimensional accuracy of the finished steel plate and even damage the rolls. The length of the intermediate bar in the last roughing pass (i.e., the intermediate bar swinging on the roller table between the roughing and finishing mills) is L1, and the length of the plate in the penultimate finishing pass is L2. The roughing mill's steel throw distance is a1, the finishing mill's steel throw distance is a2, and the safety distance of the intermediate bar swinging on the roller table is S. Slab rolling of the same specification means that adjacent slabs are made of the same material, have the same number of roughing passes, the same reduction per roughing pass, the same speed, temperature, total time, and the same intermediate bar length after roughing. The same finishing rolling start temperature, number of finishing passes, the same reduction per finishing pass, speed, and total time are also required. The time required for the intermediate bar outlet temperature (RDT) at the last roughing pass to cool to the finishing start entry temperature (FET) through air cooling is Δts. The time required for the intermediate bar to be transported via rollers from the roughing mill to the finishing mill is Δtt. The total time required for the intermediate bar to complete rolling in the finishing mill is Δtf. These parameters are determined using the rolling schedule setting program.

[0027] Step 1200: The sum of the intermediate billet transportation time and the intermediate billet rolling time is used as the intermediate billet processing time.

[0028] Specifically, the intermediate bar processing time = the intermediate bar transport time Δtt required for transporting the intermediate bar from the roughing mill to the finishing mill via the roller table + the intermediate bar rolling time Δtf required for completing rolling of the intermediate bar on the finishing mill.

[0029] Step 1311: If the intermediate billet cooling time is less than the intermediate billet processing time, the sum of the intermediate billet length, the plate length, the roughing mill throwing distance, the finishing mill throwing distance and the intermediate billet safety distance is used as the minimum roller distance.

[0030] Specifically, combined Figure 2 As shown, the distance between the roughing mill and the finishing mill is L. If the intermediary bar cooling time Δts required to cool the final roughing mill intermediate bar outlet temperature RDT to the finishing mill inlet temperature FET via air cooling is less than the intermediary bar transport time Δtt required to transport the intermediary bar from the roughing mill to the finishing mill via rollers + the intermediary bar rolling time Δtf required to complete rolling in the finishing mill, then there is no intermediary bar to be warmed up. When there are no intermediary bars to be warmed up on the rolling line, calculate the minimum required distance between the roughing mill and the finishing mill, i.e., the minimum roller distance.

[0031] Step 1312: Obtain a first intermediate billet rolling plan based on the minimum roller distance.

[0032] Specifically, in the first intermediate bar rolling plan, the minimum roller distance is used as the designed roller length. Meanwhile, an intermediate bar L1 is placed at a roughing mill throw distance a1 from the roughing mill, and a plate L2 is placed at a safety distance S from the intermediate bar. Plate L2 is at a distance a2 from the finishing mill. a1 can be equal to a2.

[0033] Step 1321: If the intermediate billet cooling time is greater than or equal to the intermediate billet processing time, compare the current roller distance with the sum of the minimum roller distance and the intermediate billet length to obtain a comparison result.

[0034] Specifically, combined Figure 2 As shown, the current roller distance between the roughing mill and the finishing mill is L. Compare the current roller distance L between the roughing mill and the finishing mill with the minimum roller distance Lmin between the roughing mill and the finishing mill + the length of the intermediate bar in the last roughing pass (i.e., the intermediate bar swinging on the roller table between the roughing mill and the finishing mill) L1.

[0035] Step 1322, according to the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length and the intermediate billet safety distance, obtain the second intermediate billet rolling plan and the third intermediate billet rolling plan.

[0036] In this embodiment, time information and rolling information are comprehensively considered. Time information includes the intermediary bar cooling time, intermediary bar transport time, and intermediary bar rolling time. Rolling information includes intermediary bar length, plate length, roughing mill steel throwing distance, finishing mill steel throwing distance, and intermediary bar safety distance, laying the foundation for subsequent solution design. The sum of the intermediary bar transport time and intermediary bar rolling time is used as the intermediary bar handling time. By calculating and comparing the intermediary bar cooling time and intermediary bar handling time, it is determined whether each intermediary bar needs to be held on the roller table for warming and swinging. This prevents high-temperature intermediaries from entering the finishing mill due to insufficient cooling and ensures that the intermediary bar temperature at the finishing mill entrance is within the optimal range. If the intermediary bar cooling time is less than the intermediary bar handling time, the minimum roller distance is calculated. This minimum roller distance is used to determine the first intermediary bar rolling plan, ensuring that all intermediaries can pass smoothly without steel blockage and avoiding unnecessary downtime. If the intermediary bar cooling time is greater than or equal to the intermediary bar handling time, the current roller distance is further compared with the sum of the minimum roller distance and the intermediary bar length. Second and third intermediary bar rolling plans are then formulated based on the specific situation. This enables the production line to adapt to changing working conditions and improve the utilization rate of the rolling mill while ensuring timely cooling of the intermediate billet.

[0037] Optionally, obtaining a second intermediate billet rolling plan and a third intermediate billet rolling plan according to the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance includes: Obtaining the number of first intermediate billets according to the intermediate billet cooling time, the intermediate billet conveying time, and the intermediate billet rolling time; When the current roller distance is less than the sum of the minimum roller distance and the intermediate billet length, obtaining the second intermediate billet rolling plan according to the number of the first intermediate billets; When the current roller distance is greater than or equal to the sum of the minimum roller distance and the intermediate billet length, the number of second intermediate billets is obtained according to the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance; The third intermediate billet rolling plan is obtained according to the number of the first intermediate billets and the number of the second intermediate billets.

[0038] Optionally, obtaining the first number of intermediate billets according to the intermediate billet cooling time, the intermediate billet transportation time, and the intermediate billet rolling time includes: Obtaining the number of the first intermediate billets according to the intermediate billet cooling time, the intermediate billet conveying time, and the intermediate billet rolling time; Wherein, the number of the first intermediate billets includes: N1=INT((Δts-Δtt) / Δtf), Wherein, N1 is the number of the first intermediate billets, INT() is an integer sign, Δts is the cooling time of the intermediate billet, Δtt is the transportation time of the intermediate billet, and Δtf is the rolling time of the intermediate billet.

[0039] Optionally, obtaining the number of second intermediate billets according to the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance includes: Obtaining the second intermediate billet quantity according to the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance; Wherein, the number of the second intermediate billets includes: N2=INT((L- Lmin) / (L1+S)), Among them, N2 is the number of the second intermediate billets, INT() is the integer sign, L is the current roller distance, Lmin is the minimum roller distance, L1 is the length of the intermediate billet, and S is the safety distance of the intermediate billet.

[0040] In some more specific embodiments, multiple intermediate bars of length L1 and a plate having a length L2 obtained in the penultimate pass are provided. When determining the number of intermediate bars for warm swing steel, the rolling process is based on uniform specifications, i.e., each slab emerging from the heating furnace has the same specifications, undergoes the same number of passes in the roughing mill, and undergoes the same number of passes in the finishing mill. Both the roughing mill and the finishing mill are reversible rolling mills. The intermediate bar having a length of L1 obtained after the roughing mill is at its maximum length during the roughing stage. During the finishing mill, the plate having a length of L2 obtained in the penultimate pass is at its maximum length within the space between the roughing and finishing mills. After the final pass in the finishing mill, the plate has a length greater than L2, but during the final pass, the plate reaches the right side of the finishing mill in the illustrated direction. After the roughing mill is completed, intermediate bars are obtained, each having a length of L1. The plate having a length of L2 obtained in the penultimate pass in the finishing mill then enters the finishing mill for the final pass. When there are multiple intermediate billets of steel to be warmed up within a distance of length L between the roughing mill and the finishing mill, this space of length L allows the placement of multiple intermediate billets of length L1 and the plate of length L2 that the finishing mill is currently carrying out the penultimate pass.

[0041] Optionally, obtaining the third intermediate billet rolling plan according to the number of the first intermediate billets and the number of the second intermediate billets includes: Obtaining a target number of intermediate billets according to the number of the first intermediate billets and the number of the second intermediate billets; The target number of intermediate billets includes: N=MIN(N1, N2), Wherein, N is the target number of intermediate billets, MIN() is a symbol for taking the smaller value of N1 and N2, N1 is the number of the first intermediate billets, and N2 is the number of the second intermediate billets; The third intermediate billet rolling plan is obtained according to the target intermediate billet quantity.

[0042] Optionally, taking the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance and the intermediate billet safety distance as the minimum roller distance includes: The minimum roller distance is the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance, and the intermediate billet safety distance; Wherein, the minimum roller distance includes: Lmin=L1+L2+S+a1+a2, Among them, Lmin is the minimum roller distance, L1 is the length of the intermediate billet, L2 is the length of the plate, S is the safety distance of the intermediate billet, a1 is the steel throwing distance of the roughing mill, and a2 is the steel throwing distance of the finishing mill.

[0043] Specifically, L1 is the length of the intermediate billet, which is the length of the intermediate billet in the last pass of rough rolling (i.e., the intermediate billet swinging on the roller table between the roughing mill and the finishing mill). L2 is the length of the plate, which is the length of the plate in the second-to-last pass of finishing rolling. S is the intermediate billet safety distance, which is the safety distance of the intermediate billet swinging on the roller table. If there are multiple intermediate billets swinging on the roller table, the safety distance between the blocks is required. a1 is the roughing mill throwing distance, and a2 is the finishing mill throwing distance, which refers to the distance the billet must leave the rolling mill after each rolling pass when the billet is rolled in the rolling mill. For the roughing mill or the finishing mill, the maximum rolling speed is similar, a1=a2. Therefore, after the last rolling pass is completed, the distance the billet leaves the rolling mill is fixed.

[0044] In this optional embodiment, during the hot rolling of thick and wide plates, if the roller length is insufficient to accommodate the flow of intermediate bars at the current rolling rhythm, the subsequent intermediate bar can easily catch up with the previous one, causing equipment alarms or shutdowns. By calculating the minimum roller distance and generating a rolling plan for the first intermediate bar based on this, continuous and efficient operation of the production line is ensured.

[0045] Optionally, the acquiring time information includes: Acquire a cooling mode, wherein the cooling mode includes an air cooling mode and a water cooling mode; The intermediate billet cooling time is obtained through the cooling mode.

[0046] Specifically, the intermediate billet between the roughing mill and the finishing mill is cooled in air, and the cooling time is calculated based on the air cooling model. If water cooling is used, the cooling time can be significantly reduced.

[0047] In some more specific embodiments, both the roughing mill and the finishing mill are four-roll reversible horizontal mills. There are differences in the specific structural types. The upper and lower working rolls of the finishing mill have working roll transverse shifting functions and working roll bending functions. These functions are aimed at improving product quality and do not involve the length of the plate, so they do not affect the number of intermediate billets to be heated. The speed at which the intermediate billet after roughing is transported to the finishing mill is selected to be 3.5m / s. The equipment distance between the roughing mill and the finishing mill is 108m. Considering that it is necessary to accelerate to 3.5m / s during transportation and then slow down to the appropriate speed for the finishing mill to bite in. The equipment distance between the roughing mill and the finishing mill described in the example is a fixed value. For the thick plate production line that has been built, the two devices have been installed and the equipment distance is fixed. When determining the number of intermediate steel billets to be heated, the specifications of the front and rear slabs are the same, that is, the thickness, width, length, and heating temperature of the front and rear slabs in the heating furnace are the same; the temperature after descaling by the high-pressure water descaling machine is the same; the number of rolling passes of the roughing mill is the same, and the size, temperature, and total time of each pass are the same; the number of rolling passes of the finishing mill is the same, and the size, temperature, and total time of each pass are the same. The length of the intermediate billet in the last pass of rough rolling is L1=10.5m, the length of the plate in the second to last pass of finishing rolling is L2=32.8m, the roughing and finishing rolling throwing distances a1 and a2=5m, the intermediate billet safety distance S=4m for the swing steel on the roller, the time required for the intermediate billet outlet temperature RDT of the last pass of roughing rolling to reach the finishing rolling inlet temperature FET through air cooling is Δts=618s, the time required for the intermediate billet to be transported from the roughing mill to the finishing mill through the roller is Δtt=55s, and the total time required for the intermediate billet to complete rolling on the finishing mill is Δtf=124s, which is the time required for 9 rolling passes on the finishing mill.

[0048] Considering the time factor, the number of steel blocks that can be kept warm between the roughing mill and the finishing mill is N1 = INT ((Δts-Δtt) / Δtf) = 4 blocks; Considering the distance factor, the number of steel blocks that can be kept warm between the roughing mill and the finishing mill is N2 = INT ((L- Lmin) / (L1 + S)) = 3 blocks; Considering comprehensively, the number of steel blocks that can be kept warm between the roughing mill and the finishing mill is N=MIN(N1, N2)=3 blocks.

[0049] Rolling of slabs of different specifications: Rolling of slabs of different specifications refers to the use of different materials or rolling procedures for adjacent slabs. In actual production, if the length of the intermediate bar in the final roughing pass (i.e., the intermediate bar swinging on the roller table between the roughing and finishing mills) differs between adjacent slabs, the length of the penultimate plate in the finishing pass differs (as shown in the figure below), the time required for the intermediate bar outlet temperature (RDT) of the final roughing pass to reach the finishing entry temperature (FET) through air cooling (Δts) differs, the total time required for the intermediate bar to complete rolling on the finishing mill (Δtf) differs, and the time required for the intermediate bar to be transported from the roughing mill to the finishing mill (Δtt) differs. The roughing and finishing mills have the same throwing distance a, and the same safety distance S for the intermediate bar swinging on the roller table. Alternatively, the adjacent slabs may have different materials or rolling procedures. The number of steel blocks that can be kept warm between the roughing mill and the finishing mill is greatly affected by the disordered changes between the above-mentioned variables. It is recommended that the time required for the outlet temperature RDT of the intermediate billet in the last pass of roughing rolling to the inlet temperature FET of finishing rolling through air cooling be the billet 1 with the smallest Δts value as the front slab to be rolled.

[0050] like Figure 3 As shown, an embodiment of the present invention provides a device for designing an intermediate billet rolling scheme for a wide and thick plate production line, comprising: Information acquisition module 310, used to acquire time information and rolling information, wherein the time information includes intermediate billet cooling time, intermediate billet transportation time, and intermediate billet rolling time; the rolling information includes intermediate billet length, plate length, roughing mill throwing distance, finishing mill throwing distance, and intermediate billet safety distance; The intermediate billet processing time acquisition module 320 is configured to take the sum of the intermediate billet transportation time and the intermediate billet rolling time as the intermediate billet processing time; A minimum roller distance acquisition module 330 is configured to use the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance, and the intermediate billet safety distance as the minimum roller distance if the intermediate billet cooling time is less than the intermediate billet processing time; A first rolling plan acquisition module 340 is configured to obtain a first intermediate billet rolling plan according to the minimum roller distance; A comparison module 350 is configured to compare the current roller distance with the sum of the minimum roller distance and the intermediate billet length to obtain a comparison result if the intermediate billet cooling time is greater than or equal to the intermediate billet processing time; The second rolling plan acquisition module 360 ​​is used to obtain the second intermediate billet rolling plan and the third intermediate billet rolling plan based on the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length and the intermediate billet safety distance.

[0051] The intermediate billet rolling scheme design device for the wide and thick plate production line of this embodiment is used to implement the intermediate billet rolling scheme design method for the wide and thick plate production line as described above. Its advantages over the existing technology are the same as the advantages of the intermediate billet rolling scheme design method for the wide and thick plate production line as described above over the existing technology, and will not be repeated here.

[0052] like Figure 4 As shown, an electronic device 400 provided by an embodiment of the present invention includes a memory 410 and a processor 420; the memory 410 is used to store computer programs; the processor 420 is used to implement the intermediate billet rolling scheme design method for the wide and thick plate production line as described above when executing the computer program.

[0053] In other words, an electronic device 400 includes a memory 410 and a processor 420 coupled to the memory 410; the memory 410 is configured to store a computer program; and the processor 420 is configured to perform the following operations when executing the computer program: Acquire time information and rolling information, wherein the time information includes intermediate billet cooling time, intermediate billet transportation time, and intermediate billet rolling time; and the rolling information includes intermediate billet length, plate length, roughing mill throwing distance, finishing mill throwing distance, and intermediate billet safety distance; The sum of the intermediate billet transportation time and the intermediate billet rolling time is used as the intermediate billet processing time; If the intermediate billet cooling time is less than the intermediate billet processing time, the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance and the intermediate billet safety distance is used as the minimum roller distance; Obtaining a first intermediate billet rolling plan according to the minimum roller distance; If the intermediate billet cooling time is greater than or equal to the intermediate billet processing time, comparing the current roller distance with the sum of the minimum roller distance and the intermediate billet length to obtain a comparison result; A second intermediate billet rolling plan and a third intermediate billet rolling plan are obtained based on the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length and the intermediate billet safety distance.

[0054] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the above-mentioned method for designing an intermediate billet rolling scheme for a wide and thick plate production line is implemented.

[0055] In other words, a non-volatile computer-readable storage medium stores a computer program, which, when executed by a processor, causes the processor to perform the following operations: Acquire time information and rolling information, wherein the time information includes intermediate billet cooling time, intermediate billet transportation time, and intermediate billet rolling time; and the rolling information includes intermediate billet length, plate length, roughing mill throwing distance, finishing mill throwing distance, and intermediate billet safety distance; The sum of the intermediate billet transportation time and the intermediate billet rolling time is used as the intermediate billet processing time; If the intermediate billet cooling time is less than the intermediate billet processing time, the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance and the intermediate billet safety distance is used as the minimum roller distance; Obtaining a first intermediate billet rolling plan according to the minimum roller distance; If the intermediate billet cooling time is greater than or equal to the intermediate billet processing time, comparing the current roller distance with the sum of the minimum roller distance and the intermediate billet length to obtain a comparison result; A second intermediate billet rolling plan and a third intermediate billet rolling plan are obtained based on the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length and the intermediate billet safety distance.

[0056] An electronic device 400 that can serve as a server or client of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device 400 is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device 400 can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0057] Electronic device 400 includes a computing unit that can perform various appropriate actions and processes based on a computer program stored in a read-only memory (ROM) or a computer program loaded from a storage unit into a random access memory (RAM). The RAM can also store various programs and data required for device operation. The computing unit, ROM, and RAM are interconnected via a bus. An input / output (I / O) interface is also connected to the bus.

[0058] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM). In this application, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network elements. Some or all of these units can be selected based on actual needs to achieve the objectives of the embodiments of the present invention. Furthermore, the functional units in the various embodiments of the present invention can be integrated into a single processing unit, each unit can exist physically separately, or two or more units can be integrated into a single unit. These integrated units can be implemented in either hardware or software functional units.

[0059] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A method for designing an intermediate billet rolling scheme for a wide and heavy plate production line, characterized in that: include: Acquire time information and rolling information, wherein the time information includes intermediate billet cooling time, intermediate billet transportation time, and intermediate billet rolling time; and the rolling information includes intermediate billet length, plate length, roughing mill throwing distance, finishing mill throwing distance, and intermediate billet safety distance; The sum of the intermediate billet transportation time and the intermediate billet rolling time is used as the intermediate billet processing time; If the intermediate billet cooling time is less than the intermediate billet processing time, the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance and the intermediate billet safety distance is used as the minimum roller distance; Obtaining a first intermediate billet rolling plan according to the minimum roller distance; If the intermediate billet cooling time is greater than or equal to the intermediate billet processing time, comparing the current roller distance with the sum of the minimum roller distance and the intermediate billet length to obtain a comparison result; A second intermediate billet rolling plan and a third intermediate billet rolling plan are obtained based on the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length and the intermediate billet safety distance.

2. The method for designing an intermediate billet rolling plan for a wide and heavy plate production line according to claim 1, characterized in that: Obtaining a second intermediate billet rolling plan and a third intermediate billet rolling plan based on the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance includes: Obtaining the number of first intermediate billets according to the intermediate billet cooling time, the intermediate billet conveying time, and the intermediate billet rolling time; When the current roller distance is less than the sum of the minimum roller distance and the intermediate billet length, obtaining the second intermediate billet rolling plan according to the number of the first intermediate billets; When the current roller distance is greater than or equal to the sum of the minimum roller distance and the intermediate billet length, the number of second intermediate billets is obtained according to the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance; The third intermediate billet rolling plan is obtained according to the number of the first intermediate billets and the number of the second intermediate billets.

3. The method for designing an intermediate billet rolling plan for a wide and heavy plate production line according to claim 2, characterized in that: The obtaining of the first number of intermediate billets according to the intermediate billet cooling time, the intermediate billet conveying time and the intermediate billet rolling time comprises: Obtaining the number of the first intermediate billets according to the intermediate billet cooling time, the intermediate billet conveying time, and the intermediate billet rolling time; Wherein, the number of the first intermediate billets includes: N1=INT((Δts-Δtt) / Δtf), Wherein, N1 is the number of the first intermediate billets, INT() is an integer sign, Δts is the cooling time of the intermediate billet, Δtt is the transportation time of the intermediate billet, and Δtf is the rolling time of the intermediate billet.

4. The method for designing an intermediate billet rolling plan for a wide and heavy plate production line according to claim 2, characterized in that: The obtaining of the number of second intermediate billets according to the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance includes: Obtaining the second intermediate billet quantity according to the current roller distance, the minimum roller distance, the intermediate billet length, and the intermediate billet safety distance; Wherein, the number of the second intermediate billets includes: N2=INT((L- Lmin) / (L1+S)), Among them, N2 is the number of the second intermediate billets, INT() is the integer sign, L is the current roller distance, Lmin is the minimum roller distance, L1 is the length of the intermediate billet, and S is the safety distance of the intermediate billet.

5. The method for designing an intermediate billet rolling plan for a wide and heavy plate production line according to claim 2, characterized in that: Obtaining the third intermediate billet rolling plan according to the number of the first intermediate billets and the number of the second intermediate billets includes: Obtaining a target number of intermediate billets according to the number of the first intermediate billets and the number of the second intermediate billets; The target number of intermediate billets includes: N=MIN(N1, N2), Wherein, N is the target number of intermediate billets, MIN() is a symbol for taking the smaller value of N1 and N2, N1 is the number of the first intermediate billets, and N2 is the number of the second intermediate billets; The third intermediate billet rolling plan is obtained according to the target intermediate billet quantity.

6. The method for designing an intermediate billet rolling plan for a wide and heavy plate production line according to claim 1, characterized in that: The method of taking the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance and the intermediate billet safety distance as the minimum roller distance includes: The minimum roller distance is the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance, and the intermediate billet safety distance; Wherein, the minimum roller distance includes: Lmin=L1+L2+S+a1+a2, Among them, Lmin is the minimum roller distance, L1 is the length of the intermediate billet, L2 is the length of the plate, S is the safety distance of the intermediate billet, a1 is the steel throwing distance of the roughing mill, and a2 is the steel throwing distance of the finishing mill.

7. The method for designing an intermediate billet rolling plan for a wide and heavy plate production line according to claim 1, characterized in that: The acquiring time information includes: Acquire a cooling mode, wherein the cooling mode includes an air cooling mode and a water cooling mode; The intermediate billet cooling time is obtained through the cooling mode.

8. A device for designing intermediate billet rolling scheme for a wide and heavy plate production line, characterized in that: include: An information acquisition module is used to acquire time information and rolling information, wherein the time information includes the intermediate billet cooling time, the intermediate billet transportation time, and the intermediate billet rolling time; the rolling information includes the intermediate billet length, the plate length, the roughing mill throwing distance, the finishing mill throwing distance, and the intermediate billet safety distance; An intermediate billet processing time acquisition module, configured to take the sum of the intermediate billet transportation time and the intermediate billet rolling time as the intermediate billet processing time; a minimum roller distance acquisition module, configured to use the sum of the intermediate billet length, the plate length, the roughing mill steel throwing distance, the finishing mill steel throwing distance, and the intermediate billet safety distance as the minimum roller distance if the intermediate billet cooling time is less than the intermediate billet processing time; A first rolling plan acquisition module, configured to obtain a first intermediate billet rolling plan according to the minimum roller distance; a comparison module, configured to compare the current roller distance with the sum of the minimum roller distance and the intermediate billet length to obtain a comparison result if the intermediate billet cooling time is greater than or equal to the intermediate billet processing time; The second rolling plan acquisition module is used to obtain the second intermediate billet rolling plan and the third intermediate billet rolling plan based on the comparison result, the intermediate billet cooling time, the intermediate billet transportation time, the intermediate billet rolling time, the current roller distance, the minimum roller distance, the intermediate billet length and the intermediate billet safety distance.

9. An electronic device, characterized in that: including memory and processor; The memory is used to store computer programs; The processor is configured to implement the method for designing an intermediate billet rolling plan for a wide and thick plate production line as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and when the computer program is executed by the processor, the method for designing an intermediate billet rolling plan for a wide and thick plate production line as described in any one of claims 1 to 7 is implemented.

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