Control method and device for continuous rolling mill train

Abstract

The application discloses a continuous rolling mill control method and device, and relates to the technical field of continuous rolling mill.The first strip steel offset of the strip steel at the first target deviation correcting roller is obtained.If the first strip steel offset is greater than the first preset threshold value, it represents that the offset of the strip steel at the first target deviation correcting roller is too large.If the high speed of the trimming shear is continuously maintained at this time, the deviation correcting roller before the trimming shear cannot completely correct the offset of the strip steel, which leads to the fact that the trimming shear cannot normally trim the edges of the strip steel.The speed of the trimming shear is reduced to the first target speed at this time, so that the deviation correcting accuracy of the deviation correcting roller before the trimming shear can be improved, the normal trimming of the edges of the strip steel by the trimming shear is ensured, and the edge blocking accident is avoided.

Description

Technical Field

[0001] This invention relates to the field of continuous rolling mill technology, and more particularly to continuous rolling mill control methods and devices. Background Technology

[0002] In continuous rolling mills, the tension leveler and scale remover improves the strip shape and breaks up iron oxide scale through tension, while the edge trimmer cuts off the two sides of the strip along its width. In actual production, strips often exhibit diagonal lines and camber defects. When these defective strips pass through the edge trimmer, one side bulges while the other contracts, preventing proper edge trimming on one side and causing the strip to become stuck at the trimmer, resulting in edge blockage. Therefore, ensuring proper edge trimming of the strip to avoid edge blockage is a problem that needs to be solved in this field. Summary of the Invention

[0003] This invention solves the technical problem of how to ensure normal edge trimming of strip steel by providing a continuous rolling mill control method and device.

[0004] On the one hand, the present invention provides the following technical solution:

[0005] A continuous rolling mill control method is applied to a continuous rolling mill including a first target straightening roll and a trimming shear, wherein strip steel passes sequentially through the first target straightening roll and the trimming shear, the method comprising:

[0006] Obtain the first strip offset at the first target correction roller;

[0007] If the first strip offset is greater than the first preset threshold, the speed of the cutting shear is reduced to the first target speed.

[0008] Preferably, the continuous rolling mill further includes a tension leveler and a stripper, through which the strip passes sequentially, along with the first target correction roll and the edge trimming shear.

[0009] Before obtaining the first strip offset at the first target correction roller, the method further includes:

[0010] Obtain the thickness of the strip steel;

[0011] The speed at which the target portion of the strip passes through the tension leveler and descaling machine is controlled to be a preset speed corresponding to the thickness of the strip. The larger the center value of the interval in which the thickness of the strip is located, the larger the corresponding preset speed.

[0012] The two ends of the target portion are respectively located on both sides of the weld of the strip steel, and the distance between the two ends of the target portion and the weld is a preset distance.

[0013] Preferably, the relationship between the preset speed and the thickness of the strip is as follows:

[0014] When the thickness of the strip is between [1800μm, 1801μm), the corresponding preset speed is 60mpm;

[0015] When the thickness of the strip is between [2000μm, 2001μm), the corresponding preset speed is 80mpm;

[0016] When the thickness of the strip is between [2001μm, 2300μm], the corresponding preset speed is 120mpm;

[0017] When the thickness of the strip is between [2301μm, 2500μm], the corresponding preset speed is 150mpm;

[0018] When the thickness of the strip is greater than 2501 μm, the corresponding preset speed is 180 mpm.

[0019] Preferably, the continuous rolling mill further includes a second target correction roll and a third target correction roll, and the strip passes through the second target correction roll, the third target correction roll, the first target correction roll, and the edge trimming shear in sequence;

[0020] Before obtaining the first strip offset at the first target correction roller, the method further includes:

[0021] Obtain the second strip offset at the second target straightening roller and the third strip offset at the third target straightening roller;

[0022] If both the second strip offset and the third strip offset are greater than the second preset threshold, then the entry speed of the strip is reduced to the second target speed.

[0023] On the other hand, the present invention also provides the following technical solution:

[0024] A continuous rolling mill control device is applied to a continuous rolling mill including a first target straightening roll and an edge trimming shear, wherein the strip steel passes sequentially through the first target straightening roll and the edge trimming shear, the device comprising:

[0025] The strip offset acquisition module is used to acquire the first strip offset at the first target correction roller;

[0026] The edge-cutting shear speed control module is used to reduce the speed of the edge-cutting shear to a first target speed if the first strip steel offset is greater than a first preset threshold.

[0027] Preferably, the continuous rolling mill further includes a tension leveler and a stripper, through which the strip passes sequentially, along with the first target correction roll and the edge trimming shear.

[0028] The continuous rolling mill control device also includes:

[0029] A strip thickness acquisition module is used to acquire the thickness of the strip.

[0030] The strip speed control module is used to control the speed of the target part of the strip through the tension leveler and the descaling machine to a preset speed corresponding to the thickness of the strip. The larger the center value of the interval where the thickness of the strip is located, the larger the corresponding preset speed.

[0031] The two ends of the target portion are respectively located on both sides of the weld of the strip steel, and the distance between the two ends of the target portion and the weld is a preset distance.

[0032] Preferably, the relationship between the preset speed and the thickness of the strip is as follows:

[0033] When the thickness of the strip is between [1800μm, 1801μm), the corresponding preset speed is 60mpm;

[0034] When the thickness of the strip is between [2000μm, 2001μm), the corresponding preset speed is 80mpm;

[0035] When the thickness of the strip is between [2001μm, 2300μm], the corresponding preset speed is 120mpm;

[0036] When the thickness of the strip is between [2301μm, 2500μm], the corresponding preset speed is 150mpm;

[0037] When the thickness of the strip is greater than 2501 μm, the corresponding preset speed is 180 mpm.

[0038] Preferably, the continuous rolling mill further includes a second target correction roll and a third target correction roll, and the strip passes through the second target correction roll, the third target correction roll, the first target correction roll, and the edge trimming shear in sequence;

[0039] The strip offset acquisition module is also used to acquire the second strip offset at the second target correction roller and the third strip offset at the third target correction roller;

[0040] The continuous rolling mill control device also includes:

[0041] The strip entry speed control module is used to reduce the entry speed of the strip to a second target speed if both the second strip offset and the third strip offset are greater than a second preset threshold.

[0042] On the other hand, the present invention also provides the following technical solution:

[0043] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement any of the above-described continuous rolling mill control methods.

[0044] On the other hand, the present invention also provides the following technical solution:

[0045] A computer-readable storage medium storing a computer program that, when executed by a processor, implements any of the above-described continuous rolling mill control methods.

[0046] One or more technical solutions provided by this invention have at least the following technical effects or advantages:

[0047] This invention obtains the first strip offset at the first target correction roller. If the first strip offset is greater than a first preset threshold, it means that the strip offset at the first target correction roller is too large. If the high speed of the edge trimmer is maintained at this time, the correction roller in front of the edge trimmer will not be able to completely correct the strip offset, resulting in the edge trimmer being unable to trim the edge normally. In this invention, the speed of the edge trimmer will be reduced to the first target speed, thereby improving the correction accuracy of the correction roller in front of the edge trimmer, ensuring that the edge trimmer trims the strip normally, and avoiding edge blockage accidents. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of a continuous rolling mill unit in an embodiment of the present invention;

[0050] Figure 2 This is a flowchart of the continuous rolling mill control method in an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of the continuous rolling mill control device in an embodiment of the present invention. Detailed Implementation

[0052] The embodiments of the present invention provide a continuous rolling mill control method and device, which solves the technical problem of how to ensure normal edge trimming of strip steel.

[0053] To better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] like Figure 1 As shown, the continuous rolling mill in this embodiment mainly includes 1#CPC (correcting roll), 2#CPC, tension leveling and descaling machine, acid tank, 5#CPC, 6#CPC, edge trimming shear, etc. During production, the strip steel passes through 2#CPC, tension leveling and descaling machine, acid tank, 5#CPC, 6#CPC, and edge trimming shear in sequence, starting from 1#CPC. Figure 1 The 2#WPD and 4#WPD mentioned are both weld inspection instruments, which will not be described in this embodiment.

[0055] When the strip is running normally without deviation, the centerline of the strip along its length should coincide with the centerline of the production line. At this point, the strip deviation is zero. The strip deviation can be expressed as the distance the strip's centerline deviates from the production line's centerline. The straightening roller is used to correct this deviation. Under normal circumstances, the edge-cutting shear operates at a very high speed, generally exceeding 100 mpm. The higher the edge-cutting shear speed, the less time is available for correction by CPC 5 and CPC 6, and the lower the correction accuracy. When the strip has diagonal lines or camber defects, the strip deviation will be significant. Excessive edge-cutting shear speed leads to low correction accuracy for CPC 5 and CPC 6, making it impossible to completely correct the strip deviation. The edge-cutting shear may not be able to properly cut one side of the strip, causing the strip to get stuck at the edge-cutting shear, resulting in an edge blockage accident.

[0056] To ensure the proper cutting of the strip by the edge-cutting shear, this embodiment proposes an application... Figure 1 Control methods for continuous rolling mills, such as... Figure 2 As shown, it includes:

[0057] Step S1: Obtain the first strip offset at the first target correction roller;

[0058] Step S2: If the first strip offset is greater than the first preset threshold, reduce the cutting speed to the first target speed.

[0059] The first target correction roller can be... Figure 1In the 5#CPC configuration, the first preset threshold can be 6mm. If the first strip offset is greater than the first preset threshold, it means that the strip offset at 5#CPC is too large. If the high speed of the shear continues at this point, 5#CPC and 6#CPC will not have enough time to completely correct the strip offset. In this embodiment, the speed of the shear is reduced to a first target speed, which can be 40mpm. This improves the correction accuracy of 5#CPC and 6#CPC, ensuring normal edge cutting of the strip and avoiding edge blockage accidents. Of course, theoretically, the speed of the shear can also be controlled according to the strip offset at 6#CPC. However, 6#CPC is too close to the shear, and even if the speed of the shear is reduced after detecting the offset, 6#CPC will not have enough time to correct the offset. In addition, when the first strip offset is less than the first preset threshold, the limitation on the shear speed can be lifted, and the shear speed can reach up to 300mpm.

[0060] In actual production, in addition to edge-blocking accidents, strip breakage accidents can also occur. Strip breakage accidents are characterized by strips with diagonal groove defects being prone to breakage under the tension of a tension leveler when passing through it. This is especially true for continuously rolled strips, which are long strips formed by welding strips together end to end. Each weld has the tail of the preceding strip and the head of the following strip on either side. The weld section is more prone to breakage when passing through the tension leveler. Moreover, the thinner the strip and the greater the possibility of diagonal groove defects, the higher the risk of breakage at the weld section. The faster the strip passes through the tension leveler and the lower the precision of the tension leveler, the higher the risk of strip breakage.

[0061] To reduce the risk of strip breakage when the weld seam of the strip passes through the tension leveler and scale-breaking machine, before step S1, the continuous rolling mill control method of this embodiment may further include: obtaining the thickness of the strip; controlling the speed of the target portion of the strip through the tension leveler and scale-breaking machine to a preset speed corresponding to the thickness of the strip, wherein the larger the center value of the interval where the thickness of the strip is located, the larger the corresponding preset speed; wherein, the two ends of the target portion are respectively located on both sides of the weld seam of the strip, and the distance between the two ends of the target portion and the weld seam is a preset distance.

[0062] The preset distance can be 20m before and after the weld. Therefore, the target portion of the strip includes the 20m tail of the preceding strip and the 20m head of the following strip. The larger the center value of the strip thickness interval and the higher the corresponding preset speed, the thinner the strip and the greater the possibility of diagonal strip defects, leading to a higher risk of weld breakage. In this embodiment, the target portion of the strip passes through the tension leveling and descaling machine at a slower speed, improving the machine's accuracy and reducing the risk of weld breakage from a speed perspective.

[0063] The relationship between the preset speed and the strip thickness is as follows: when the strip thickness is between [1800μm, 1801μm), the preset speed is 60mpm; when the strip thickness is between [2000μm, 2001μm), the preset speed is 80mpm; when the strip thickness is between [2001μm, 2300μm], the preset speed is 120mpm; when the strip thickness is between [2301μm, 2500μm], the preset speed is 150mpm; and when the strip thickness is greater than 2501μm, the preset speed is 180mpm. In this embodiment, because strip thicknesses of [1801μm, 2000μm), (2300μm, 2301μm), and (2500μm, 2501μm) are not used in actual production, the corresponding preset speeds are not given.

[0064] In this embodiment, the magnitude of the strip offset before passing through the tension leveler and descaling machine also affects the probability of strip breakage; the larger the offset, the greater the likelihood of strip breakage. To avoid excessive strip offset leading to an excessively high risk of strip breakage when passing through the tension leveler and descaling machine, before step S1, the continuous rolling mill control method of this embodiment may further include: obtaining the second strip offset at the second target straightening roller and the third strip offset at the third target straightening roller; if both the second and third strip offsets are greater than a second preset threshold, then reducing the strip entry speed to the second target speed.

[0065] The strip entry speed is actually the uncoiling speed of the uncoiler, which is also equivalent to the strip running speed. The second target correction roller can be... Figure 1 In the 1#CPC, the third target correction roller can be Figure 1 In the 2#CPC, the second preset threshold can be 25mm, and the second target speed can be 80mpm. When the strip's offset at both the second and third target straightening rollers is greater than the second preset threshold, it indicates that the strip's offset is too large. If the strip's entry speed is too high at this time, the 1#CPC and 2#CPC cannot correct the offset in time, resulting in low straightening accuracy. This leads to excessive offset of the strip when it reaches the Dara straightening and descaling machine, increasing the risk of strip breakage. In this embodiment, the strip's entry speed is reduced to the second target speed to ensure the straightening accuracy of the 1#CPC and 2#CPC and reduce the risk of strip breakage when the strip passes through the Dara straightening and descaling machine. Of course, if the strip's offset at the second or third target straightening roller is less than the second preset threshold, the restriction on the strip's entry speed will be lifted, and the entry speed can reach up to 500mpm.

[0066] like Figure 3 As shown, this embodiment also provides a continuous rolling mill control device, applied to... Figure 1 The continuous rolling mill unit, the continuous rolling mill unit control device includes:

[0067] The strip offset acquisition module is used to acquire the first strip offset at the first target correction roller;

[0068] The edge-cutting shear speed control module is used to reduce the edge-cutting shear speed to the first target speed if the first strip steel offset is greater than the first preset threshold.

[0069] Furthermore, the continuous rolling mill control device may also include: a strip thickness acquisition module for acquiring the thickness of the strip; a strip speed control module for controlling the speed of the target part of the strip through the tension leveler to a preset speed corresponding to the thickness of the strip, wherein the larger the center value of the interval where the thickness of the strip is located, the larger the corresponding preset speed; the two ends of the target part are respectively located on both sides of the weld of the strip, and the distance between the two ends of the target part and the weld is a preset distance.

[0070] The relationship between the preset speed and the thickness of the strip is as follows: when the thickness of the strip is between [1800μm, 1801μm), the corresponding preset speed is 60mpm; when the thickness of the strip is between [2000μm, 2001μm), the corresponding preset speed is 80mpm; when the thickness of the strip is between [2001μm, 2300μm], the corresponding preset speed is 120mpm; when the thickness of the strip is between [2301μm, 2500μm], the corresponding preset speed is 150mpm; and when the thickness of the strip is greater than 2501μm, the corresponding preset speed is 180mpm.

[0071] Furthermore, the strip offset acquisition module can also be used to acquire the second strip offset at the second target correction roller and the third strip offset at the third target correction roller.

[0072] The continuous rolling mill control device may also include: a strip inlet speed control module, used to reduce the strip inlet speed to the second target speed if both the second strip offset and the third strip offset are greater than the second preset threshold.

[0073] Based on the same inventive concept as the continuous rolling mill control method described above, this embodiment also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of any of the methods described above for the continuous rolling mill control method.

[0074] The bus architecture (represented by a bus) can include any number of interconnected buses and bridges, linking various circuits including one or more processors (represented by a processor) and memory (represented by memory). The bus can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface between the bus and receivers and transmitters. Receivers and transmitters can be the same element, a transceiver, providing a unit for communicating with various other devices over a transmission medium. The processor is responsible for managing the bus and general processing, while memory can be used to store data used by the processor during operation.

[0075] Since the electronic device described in this embodiment is the electronic device used to implement the continuous rolling mill control method in this embodiment of the invention, those skilled in the art can understand the specific implementation and various variations of the electronic device based on the continuous rolling mill control method described in this embodiment of the invention. Therefore, how the electronic device implements the method in this embodiment of the invention will not be described in detail here. Any electronic device used by those skilled in the art to implement the continuous rolling mill control method in this embodiment of the invention falls within the scope of protection of this invention.

[0076] Based on the same inventive concept as the above-described continuous rolling mill control method, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements any of the above-described continuous rolling mill control methods.

[0077] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0078] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of 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, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0079] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0080] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0081] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0082] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A continuous rolling mill control method, applied to a continuous rolling mill including a first target straightening roll and a trimming shear, wherein strip steel passes sequentially through the first target straightening roll and the trimming shear, characterized in that, The method includes: Obtain the first strip offset at the first target correction roller; If the first strip offset is greater than a first preset threshold, then the speed of the shearing is reduced to a first target speed; The continuous rolling mill also includes a tension leveler and scale breaker, through which the strip steel passes sequentially, along with the first target correction roller and the edge trimming shear. Before obtaining the first strip offset at the first target correction roller, the method further includes: Obtain the thickness of the strip steel; The speed at which the target portion of the strip passes through the tension leveler and descaling machine is controlled to be a preset speed corresponding to the thickness of the strip. The larger the center value of the interval in which the thickness of the strip is located, the larger the corresponding preset speed. The two ends of the target portion are respectively located on both sides of the weld of the strip steel, and the distance between the two ends of the target portion and the weld is a preset distance.

2. The continuous rolling mill control method as described in claim 1, characterized in that, The relationship between the preset speed and the thickness of the strip is as follows: When the thickness of the strip is between [1800μm, 1801μm), the corresponding preset speed is 60mpm; When the thickness of the strip is between [2000μm, 2001μm), the corresponding preset speed is 80mpm; When the thickness of the strip is between [2001μm, 2300μm], the corresponding preset speed is 120mpm; When the thickness of the strip is between [2301μm, 2500μm], the corresponding preset speed is 150mpm; When the thickness of the strip is greater than 2501 μm, the corresponding preset speed is 180 mpm.

3. The continuous rolling mill control method as described in claim 1, characterized in that, The continuous rolling mill also includes a second target correction roll and a third target correction roll. The strip steel passes through the second target correction roll, the third target correction roll, the first target correction roll, and the edge trimming shear in sequence. Before obtaining the first strip offset at the first target correction roller, the method further includes: Obtain the second strip offset at the second target straightening roller and the third strip offset at the third target straightening roller; If both the second strip offset and the third strip offset are greater than the second preset threshold, then the entry speed of the strip is reduced to the second target speed.

4. A continuous rolling mill control device, applied to a continuous rolling mill including a first target straightening roll and an edge trimming shear, wherein strip steel passes sequentially through the first target straightening roll and the edge trimming shear, characterized in that, The device includes: The strip offset acquisition module is used to acquire the first strip offset at the first target correction roller; The edge-cutting shear speed control module is used to reduce the speed of the edge-cutting shear to a first target speed if the first strip steel offset is greater than a first preset threshold. The continuous rolling mill also includes a tension leveler and scale breaker, through which the strip steel passes sequentially, along with the first target correction roller and the edge trimming shear. The continuous rolling mill control device also includes: A strip thickness acquisition module is used to acquire the thickness of the strip. The strip speed control module is used to control the speed of the target part of the strip through the tension leveler and the descaling machine to a preset speed corresponding to the thickness of the strip. The larger the center value of the interval where the thickness of the strip is located, the larger the corresponding preset speed. The two ends of the target portion are respectively located on both sides of the weld of the strip steel, and the distance between the two ends of the target portion and the weld is a preset distance.

5. The continuous rolling mill control device as described in claim 4, characterized in that, The relationship between the preset speed and the thickness of the strip is as follows: When the thickness of the strip is between [1800μm, 1801μm), the corresponding preset speed is 60mpm; When the thickness of the strip is between [2000μm, 2001μm), the corresponding preset speed is 80mpm; When the thickness of the strip is between [2001μm, 2300μm], the corresponding preset speed is 120mpm; When the thickness of the strip is between [2301μm, 2500μm], the corresponding preset speed is 150mpm; When the thickness of the strip is greater than 2501 μm, the corresponding preset speed is 180 mpm.

6. The continuous rolling mill control device as described in claim 4, characterized in that, The continuous rolling mill also includes a second target correction roll and a third target correction roll. The strip steel passes through the second target correction roll, the third target correction roll, the first target correction roll, and the edge trimming shear in sequence. The strip offset acquisition module is also used to acquire the second strip offset at the second target correction roller and the third strip offset at the third target correction roller; The continuous rolling mill control device also includes: The strip entry speed control module is used to reduce the entry speed of the strip to a second target speed if both the second strip offset and the third strip offset are greater than a second preset threshold.

7. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the continuous rolling mill control method according to any one of claims 1-3.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the continuous rolling mill control method according to any one of claims 1-3.

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