Method for variable speed shearing in a continuous rolling mill and related apparatus

Abstract

This invention discloses a variable-speed shearing method and related equipment for continuous rolling mills, relating to the field of cold-rolled strip steel production technology control, primarily addressing the lack of a more systematic method for controlling the shearing speed of continuous rolling mills. The method includes: determining preset parameters of the target continuous rolling mill under variable-speed shearing conditions; and controlling the target continuous rolling mill to undergo segmented speed changes based on the preset parameters, wherein the speed changes include acceleration, deceleration, holding, and shutdown. This invention is used in the variable-speed shearing process of continuous rolling mills.

Description

Technical Field

[0001] This invention relates to the field of cold-rolled strip steel production technology control, and in particular to a continuous rolling mill speed-changing shearing method and related equipment. Background Technology

[0002] In the increasingly fierce competition for cost reduction and efficiency improvement, it has become extremely important to steadily improve product quality, increase the production efficiency of continuous rolling mills, and reduce costs. In the production process of cold-rolled strip steel, each process has its own bottlenecks. When the process of the preceding process changes in the rolling mill area, the control of the shearing speed is crucial to the efficiency of coil production, and it can also consume the strip steel that has accumulated in the looper due to the process change in the preceding process.

[0003] However, when increasing the shearing speed in a cold continuous rolling mill, the strip head at the exit may wrinkle or fold as it passes through the coiler, and the strip tail ejected at high speed may experience positioning failure and wrinkling, leading to a series of quality problems and safety hazards. Currently, a more systematic method for controlling the shearing speed of a continuous rolling mill is still lacking. Summary of the Invention

[0004] In view of the above problems, the present invention provides a variable speed shearing method and related equipment for continuous rolling mills, the main purpose of which is to solve the problem of lacking a more systematic shearing speed control method for continuous rolling mills.

[0005] To solve at least one of the above-mentioned technical problems, in a first aspect, the present invention provides a method for variable speed shearing in a continuous rolling mill, the method comprising:

[0006] Under the condition of variable speed shearing, determine the preset parameters of the target continuous rolling mill;

[0007] Based on the aforementioned preset parameters, the target continuous rolling mill is controlled to undergo segmented speed changes, wherein the speed changes include speed increase, speed decrease, holding, and shutdown.

[0008] Optionally, the preset parameters mentioned above include tension, bending force, and roll shifting.

[0009] Optionally, the above-mentioned variable speed shearing conditions include: the connection span between the front and rear rolls meets preset requirements, the rolling setting value span between the front and rear rolls meets preset requirements, and non-special processes.

[0010] Optionally, the above-mentioned determination of the preset parameters of the target continuous rolling mill under the condition of variable speed shearing includes:

[0011] If the width variation of the front and rear rolls exceeds the first preset range, or the yield strength variation exceeds the second preset range, the tension of the target continuous rolling mill is increased.

[0012] Optionally, the above-mentioned segmented speed control of the target continuous rolling mill based on the above-mentioned preset parameters includes:

[0013] Determine the initial shear rate;

[0014] When the weld seam enters the next stand of the aforementioned target continuous rolling mill, segmented speed change is performed.

[0015] Optionally, the above-mentioned segmented speed control of the target continuous rolling mill based on the above-mentioned preset parameters includes:

[0016] In the event of the aforementioned abnormal shearing speed, a deceleration and holding operation is performed on the last stand of the target continuous rolling mill, wherein the time interval between the deceleration and holding operations is less than a preset time.

[0017] Optionally, the above-mentioned segmented speed control of the target continuous rolling mill based on the above-mentioned preset parameters includes:

[0018] After the above shearing is completed, the initial shearing rate is returned to the above.

[0019] The speed-up operation is performed when the belt coiler of the target continuous rolling mill falls.

[0020] Secondly, embodiments of the present invention also provide a variable speed shearing device for a continuous rolling mill, comprising:

[0021] The determination unit is used to determine the preset parameters of the target continuous rolling mill under the condition of variable speed shearing.

[0022] The control unit is used to control the segmented speed change of the target continuous rolling mill based on the preset parameters mentioned above, wherein the speed change includes speed increase, speed decrease, holding and stopping.

[0023] To achieve the above objectives, according to a third aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium comprising a stored program, wherein, when the program is executed by a processor, the steps of the above-described continuous rolling mill variable speed shearing method are implemented.

[0024] To achieve the above objectives, according to a fourth aspect of the present invention, an electronic device is provided, comprising at least one processor and at least one memory connected to the processor; wherein the processor is configured to invoke program instructions in the memory to execute the steps of the continuous rolling mill variable speed shearing method described above.

[0025] The above technical solution addresses the challenge of increasing production efficiency in rolling mills through varying shearing speeds, while also mitigating the risks associated with such increases. This application employs a production process that controls shearing speed variations by determining variable-speed shearing conditions, setting preset parameters, implementing segmented speed changes, stabilizing shearing, and adjusting the speed increase. This ensures smooth and stable shearing speed changes, locks in the desired shearing speed, and guarantees normal quality after shearing, with no abnormal defects on the outer ring of the finished steel coil.

[0026] Correspondingly, the continuous rolling mill speed-changing shearing device, equipment, and computer-readable storage medium provided in the embodiments of the present invention also have the above-mentioned technical effects.

[0027] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 A schematic flowchart of a variable speed shearing method for a continuous rolling mill provided by an embodiment of the present invention is shown;

[0030] Figure 2 This diagram illustrates the judgment logic of a variable speed shearing method for a continuous rolling mill according to an embodiment of the present invention.

[0031] Figure 3 This diagram illustrates a rack equipment distribution according to an embodiment of the present invention.

[0032] Figure 4 This is a schematic block diagram illustrating the composition of a variable speed shearing device for a continuous rolling mill according to an embodiment of the present invention;

[0033] Figure 5 This diagram illustrates the composition of a variable speed shearing electronic device for a continuous rolling mill, as provided in an embodiment of the present invention. Detailed Implementation

[0034] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0035] To address the lack of a more systematic method for controlling the shearing speed of continuous rolling mills, embodiments of this invention provide a variable-speed shearing method for continuous rolling mills, such as... Figure 1 , Figure 2 and Figure 3 As shown, the method includes:

[0036] S101. Under the condition of meeting the variable speed shearing conditions, determine the preset parameters of the target continuous rolling mill; wherein, the preset parameters include tension, bending roll force and roll shifting, and the variable speed shearing conditions include: the connection span between the front and rear rolls meets the preset requirements, the rolling setting value span between the front and rear rolls meets the preset requirements and non-special processes.

[0037] For example, before shearing, the production plan is first determined, and the span between the front and rear rolls is determined based on the production plan. If the span between the front and rear rolls is too large, this variable speed shearing method will not be adopted for the time being, and the priority will be to ensure the transition of parameter changes.

[0038] Specifically, the pre-set requirement for the connection span between the front and rear rolls is as follows: Due to the risk of weld strength issues arising from excessive connection span during production, adjustments may affect the variable speed shearing effect. The risk range is listed below:

[0039] (1) The difference in yield strength between the front and rear rolls is less than or equal to 150 MPa.

[0040] (2) The difference in width between the front and rear rolls is less than or equal to 150mm.

[0041] (3) The difference in thickness between the front and rear rolls of raw material is less than or equal to 1.0 mm.

[0042] (4) The difference in the front and rear roll reduction rates is less than or equal to 15%.

[0043] (5) The yield strength of any one of the rolls (both front and back rolls) is greater than 600 MPa.

[0044] Furthermore, the setting value for the front and rear rolls to meet the preset requirements is set as follows: Since excessive jumps in rolling parameters during production will increase the difficulty of rolling adjustments in high-speed and variable-speed conditions, the parameters can be adjusted in a timely manner during actual production.

[0045] It is understandable that special process requirements must be followed: when dealing with raw material defects, abnormal weld conditions, or unstable welding, the variable speed shearing operation must be stopped.

[0046] The above-mentioned step S101 further includes S1011:

[0047] S1011. If the width variation of the front and rear rolls is greater than the first preset range, or the yield strength variation is greater than the second preset range, increase the tension of the target continuous rolling mill.

[0048] For example, regarding the above tension preset: when the width of the subsequent roll increases or decreases by more than 100mm compared to the current roll, or when the yield strength increases or decreases by more than 100MPa, the tension setting of the current roll needs to be increased by 5-10% to ensure a smooth rolling transition. No adjustment is needed in other cases. Regarding the above bending roll force preset (work roll, intermediate roll): if there are no issues with specification connections exceeding limits, the bending roll force can be controlled normally. Regarding the above roll shifting preset: roll shifting on the stand has little impact on the rolling state; it can simply follow the set value.

[0049] S102. Control the segmented speed change of the target continuous rolling mill based on the above-mentioned preset parameters, wherein the speed change includes speed increase, speed decrease, holding and stopping.

[0050] The steps in S102 above also include:

[0051] S1021. Determine the initial shearing speed; when the weld enters the next stand of the aforementioned target continuous rolling mill, perform segmented speed changes.

[0052] For example, taking the target continuous rolling mill including stands S1-S5 as an example, this application uses the weld as a reference. The rolling mill unit will reduce to the set shearing speed before the weld enters stand S1. Changing the shearing speed at this time will cause the system to be unprepared and trigger an alarm shutdown. Since stands S4-S5 are in close proximity to the shearing, if the shearing speed is reduced at this point, it will cause a shearing speed mismatch and trigger an alarm shutdown. Therefore, under normal circumstances, the speed reduction has already been completed between stands S4-S5.

[0053] It should be noted that the speed control function of the rolling mill unit is divided into four control modes: speed increase, speed decrease, holding, and shutdown. The speed decrease ratio of the rolling mill unit system is 0.6m / S2, the length between stands is 7m, and the length of the stand is 3m. The extension length generated by each stand during the speed decrease process is different. It is very difficult to accurately calculate the speed decrease during shearing. Considering the speed adjustment, a very precise speed decrease is not required. It is sufficient to make a range adjustment according to the specifications.

[0054] The above-mentioned shearing speed setting range is for a mill exit speed greater than or equal to 60 m / min and less than or equal to 300 m / min. Shearing outside this speed range will trigger an alarm and shutdown. Observation of the speed before and after shearing shows that the unit speed fluctuates slightly during shearing, with a fluctuation amplitude of less than 1 m / min. Therefore, to avoid shearing speed fluctuations triggering alarms, the maximum shearing speed setting is 299 m / min.

[0055] For example, in order to improve production efficiency, this application considers the need for different shearing speeds due to the short time frequency and strong operation continuity, based on the requirements of the shearing effect. Furthermore, the speed cannot be increased before the shearing is completed after the speed change. The segmented speed change is divided into two levels, as shown in Table 1, which are the first speed change and the second speed change. Selecting each speed reduction segment can obtain different shearing speeds.

[0056] Table 1

[0057]

[0058] The selection of variable speed in this application is mainly based on the exit thickness and the threading state after shearing. Too thick a thickness can easily cause a tapered shape, while too thin a thickness can easily cause wrinkles and folds during threading. Based on the threading of the tape head and the tape tail after shearing, the selection of exit thickness to match the shearing speed is mainly based on the last roll specification. The exit thickness is divided into 3 levels, as shown in Table 2.

[0059] Table 2

[0060]

[0061] Shearing is carried out only after verification to ensure that no process failures or quality problems occur.

[0062] Specifically, the aforementioned variable speed shearing method includes: initial speed change, secondary speed change, stable shearing, and speed adjustment.

[0063] Furthermore, this application performs an initial speed change after setting the shearing speed. This initial speed change occurs when the weld seam enters the S1 stand on the operating interface. Specifically, the operation method is to observe the mill exit speed reaching 299 m / min on the interface and then press the speed reduction button to issue a command. (This state allows the normal shearing mode to be switched to variable speed shearing.)

[0064] S1022. In the event of the above-mentioned abnormal shearing speed, a deceleration operation and a holding operation are performed on the last stand of the target continuous rolling mill, wherein the time interval between the deceleration operation and the holding operation is less than a preset time.

[0065] For example, the above operation is a two-stage speed change, and the operation positions are divided into S1-S2 frame, S2-S3 frame, S3-S4 frame, and S4-S5 frame. Specifically, the operation method is to observe the weld seam on the interface and when it reaches the speed change position, press the speed hold button to decrease the speed, then press the deceleration button to issue a deceleration command, thus completing the second deceleration operation.

[0066] Furthermore, this application reduces the set shearing speed of 299 m / min through segmented speed changes in the previous step, resulting in different shearing speeds. The shearing speed changes are completed before the S4-S5 racks to ensure stable entry into the shearing process. If the shearing speed adjustment is not timely, the following judgment will be made:

[0067] 1. Reasonable shearing speed

[0068] Achieving a reasonable cutting speed completes the cutting and splitting process.

[0069] 2. Inappropriate shearing speed

[0070] (1) If the shearing speed does not decrease, change the speed again on the S5 frame. The operation method is as follows: when the weld reaches the speed change position in the interface, press the deceleration button to issue a command, and then press the speed hold button within the preset time. Even if a shearing alarm occurs, it is necessary to avoid quality problems or damage to the equipment. It is understood that the above preset time should be as short as possible.

[0071] (2) Even if the shearing speed is reduced too much, shearing can still be performed without causing any abnormalities.

[0072] S1023. After the above shearing is completed, return to the initial shearing speed; when the belt coiler of the target continuous rolling mill falls, perform the speed increase operation.

[0073] For example, after shearing is completed, press the shearing speed setting button, at which point the speed will return to 299 m / min. After the coiling aid falls, press the mill speed increase button. After completing this adjustment, adjust parameters such as the strip shape as usual, and proceed with the normal rolling of the next coil.

[0074] The above technical solution addresses the challenge of increasing production efficiency in rolling mills through varying shearing speeds, while also mitigating the risks associated with such increases. This application analyzes five aspects—determining variable-speed shearing conditions, setting preset parameters, segmented speed changes, stable shearing, and speed adjustment—to control the production process of varying shearing speeds. This ensures smooth and stable shearing speed changes, locks in the desired shearing speed, and guarantees normal quality after shearing, with no abnormal defects on the outer ring of the finished steel coil.

[0075] Furthermore, the following illustrates three embodiments of this application:

[0076] Example 1:

[0077] Front and back roll specifications:

[0078]

[0079] (I) Production Plan: 1. Observe the production plan

[0080] 2. Determining the size of the gap between the beginning and end of a volume

[0081] The connection is deemed risk-free.

[0082] (1) The difference in yield strength between the front and back rolls is 78 MPa.

[0083] (2) The difference in width between the front and rear rolls is 102mm.

[0084] (3) The thickness difference between the front and rear rolls of raw material is 0.5 mm.

[0085] (4) The difference in the front and rear roll reduction rates is 7.3%.

[0086] (5) The yield strength of any one of the rolls (both front and back rolls) is 275 MPa.

[0087] 3. Classification of large gaps between front and rear coil rolling setting values

[0088] Because the rolling parameters jump during the production process, it will increase the difficulty of rolling adjustment in high-speed and variable speed conditions. Therefore, the parameters can be adjusted in time during production.

[0089] 4. Implement special process requirements

[0090] No special process requirements were obtained (II) Preset parameters:

[0091] 1. Tension preset

[0092] When the width of the next roll is more than 100mm larger or smaller than that of the current roll, the tension of the current roll should be set to 5-10%.

[0093] 2. Preset bending force (work roll, intermediate roll)

[0094] The bending roller force is under normal control.

[0095] 3. Pre-setting of roller shifting

[0096] Follow the set value.

[0097] (III) Segmented speed change:

[0098] The thickness of the next roll at the exit is 0.8 mm, and the shearing speed is set to 299 m / min.

[0099] 1. First gear shift

[0100] After setting the shearing speed, the first speed change operation position is when the weld seam enters the S1 frame on the operation interface.

[0101] The operation method is to observe the mill exit speed on the interface until it reaches 299 m / min, then press the deceleration button to issue a command. Switch from normal shearing mode to variable speed shearing, resulting in a speed of 299 m / min ± 2.

[0102] 2. Secondary speed change

[0103] The secondary speed change operation position was selected between frames S2 and S3. The operation method was to observe the weld seam on the interface and when it reached the speed change position, press the speed hold button to decrease the speed, then press the deceleration button to issue a deceleration command, thus completing the second deceleration operation. The obtained shearing speed was 227 m / min ± 22.

[0104] (iv) Steady shear:

[0105] Achieving a reasonable cutting speed completes the cutting and splitting process.

[0106] (V) Speed ​​Adjustment:

[0107] After shearing is complete, press the shearing speed setting button; the speed will then return to 299 m / min. After the coiler descends, press the mill speed increase button.

[0108] After adjusting this operation method, adjust parameters such as the plate shape as usual, and then proceed to the normal rolling of the next coil.

[0109] Example 2:

[0110] Front and back roll specifications:

[0111]

[0112]

[0113] (I) Production Plan:

[0114] 1. Observe the production plan

[0115] 2. Determining the size of the gap between the beginning and end of a volume

[0116] The connection is deemed risk-free.

[0117] (1) The difference in yield strength between the front and back rolls is 33 MPa.

[0118] (2) The difference in width between the front and rear rolls is 2mm.

[0119] (3) The thickness difference between the front and rear rolls of raw material is 0.5 mm.

[0120] (4) The difference in the front and rear roll reduction rates is 0.6%.

[0121] (5) The yield strength of any one of the rolls (both front and back rolls) is 228 MPa.

[0122] 3. Classification of large gaps between front and rear coil rolling setting values

[0123] Because the rolling parameters jump during the production process, it will increase the difficulty of rolling adjustment in high-speed and variable speed conditions. Therefore, the parameters can be adjusted in time during production.

[0124] 4. Implement special process requirements

[0125] No special process requirements were obtained.

[0126] (II) Preset parameters:

[0127] 1. Tension preset

[0128] The width and yield strength of the subsequent roll are not significantly different from the current roll, so no adjustment is needed.

[0129] 2. Preset bending force (work roll, intermediate roll)

[0130] The bending roller force is under normal control.

[0131] 3. Pre-setting of roller shifting

[0132] Follow the set value.

[0133] (III) Segmented speed change:

[0134] The thickness of the next roll at the exit is 0.595mm, and the shearing speed is set to 299m / min.

[0135] 1. First gear shift

[0136] After setting the shearing speed, the first speed change operation position is when the weld seam enters the S1 frame on the operation interface.

[0137] The operation method is to observe the mill exit speed on the interface until it reaches 299 m / min, then press the deceleration button to issue a command. Switch from normal shearing mode to variable speed shearing, resulting in a speed of 299 m / min ± 2.

[0138] 2. Secondary speed change

[0139] The secondary speed change operation was performed between frames S3 and S4. The procedure was to observe the weld seam on the interface until it reached the designated speed change position, then instantly press the speed hold button to decrease the speed, and then press the deceleration button to issue a deceleration command, completing the second deceleration operation. The resulting shearing speed was 187 m / min ± 37.

[0140] (iv) Steady shear:

[0141] Achieving a reasonable cutting speed completes the cutting and splitting process.

[0142] (V) Speed ​​Adjustment:

[0143] After shearing is complete, press the shearing speed setting button; the speed will then return to 299 m / min. After the coiler descends, press the mill speed increase button.

[0144] After adjusting this operation method, adjust parameters such as the plate shape as usual, and then proceed to the normal rolling of the next coil.

[0145] Example 3:

[0146] Front and back roll specifications:

[0147]

[0148] (I) Production Plan: 1. Observe the production plan

[0149] 2. Determining the size of the span between the preceding and following volumes

[0150] The assessment suggests there is a risk in the connection.

[0151] (1) The difference in yield strength between the front and back rolls is 102 MPa.

[0152] (2) The difference in width between the front and rear rolls is 71mm.

[0153] (3) The thickness difference between the front and rear rolls of raw material is 0.5 mm.

[0154] (4) The difference in the front and rear roll reduction rates is 14.3%.

[0155] (5) The yield strength of any one of the rolls (both front and back rolls) is 674 MPa.

[0156] It was determined that variable speed shearing operation would not be performed.

[0157] Furthermore, as a response to the above Figure 1 In addition to the implementation of the method shown, this embodiment of the invention also provides a continuous rolling mill speed-changing shearing device for the above-mentioned... Figure 1 The method shown is implemented accordingly. This device embodiment corresponds to the foregoing method embodiment. For ease of reading, this device embodiment will not repeat the details of the foregoing method embodiment, but it should be clear that the device in this embodiment can implement all the contents of the foregoing method embodiment. Figure 4 As shown, the device includes: a determining unit 21 and a control unit 22, wherein...

[0158] The determining unit 21 is used to determine the preset parameters of the target continuous rolling mill under the condition of meeting the variable speed shearing conditions;

[0159] Control unit 22 is used to control the segmented speed change of the target continuous rolling mill based on the preset parameters, wherein the speed change includes speed increase, speed decrease, holding and stopping.

[0160] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and by adjusting kernel parameters, a variable-speed shearing method for continuous rolling mills can be implemented, addressing the lack of a more systematic shearing speed control method for continuous rolling mills.

[0161] This invention provides a computer-readable storage medium including a stored program that, when executed by a processor, implements the aforementioned continuous rolling mill speed-changing shearing method.

[0162] This invention provides a processor for running a program, wherein the program executes the continuous rolling mill speed-changing shearing method.

[0163] This invention provides an electronic device, which includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the continuous rolling mill speed-changing shearing method described above.

[0164] This invention provides an electronic device 30, such as... Figure 5 As shown, the electronic device includes at least one processor 301, and at least one memory 302 and bus 303 connected to the processor; wherein, the processor 301 and the memory 302 communicate with each other through the bus 303; the processor 301 is used to call program instructions in the memory to execute the above-mentioned continuous rolling mill speed change shearing method.

[0165] The smart electronic devices mentioned in this article can be PCs, tablets, mobile phones, etc.

[0166] This application also provides a computer program product that, when executed on a process management electronic device, is suitable for executing a program that initializes the steps of the above-described continuous rolling mill variable speed shearing method.

[0167] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0168] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application 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.

[0169] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. 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 computer, 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, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0170] 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.

[0171] 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.

[0172] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to perform actions such as... Figure 1 The control flow of the memory in the corresponding embodiment.

[0173] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0174] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0175] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0176] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0177] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0178] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0179] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for variable-speed shearing in a continuous rolling mill, characterized in that, include: Under the condition of variable speed shearing, the preset parameters of the target continuous rolling mill are determined. The preset parameters include tension, bending roll force and roll shifting. The variable speed shearing conditions include: the connection span between the front and rear coils meets the preset requirements, the rolling setting value between the front and rear coils meets the preset requirements and non-special processes. The connection span between the front and rear coils includes the difference in yield strength between the front and rear coils, the difference in width between the front and rear coils, the difference in raw material thickness between the front and rear coils, and the difference in reduction rate between the front and rear coils. The target continuous rolling mill is controlled to change speed in stages based on the preset parameters, wherein the speed change includes speed increase, speed decrease, speed hold and speed stop.

2. The method according to claim 1, characterized in that, Determining the preset parameters of the target continuous rolling mill under the condition of variable speed shearing includes: If the width variation of the front and rear rolls exceeds a first preset range, or the yield strength variation exceeds a second preset range, the tension of the target continuous rolling mill is increased.

3. The method according to claim 1, characterized in that, The step of controlling the segmented speed change of the target continuous rolling mill based on the preset parameters includes: Determine the initial shear rate; As the weld seam enters the next stand of the target continuous rolling mill, segmented speed changes are performed.

4. The method according to claim 3, characterized in that, The step of controlling the segmented speed change of the target continuous rolling mill based on the preset parameters includes: In the event of an abnormal shearing speed, a deceleration and holding operation is performed on the last stand of the target continuous rolling mill, wherein the time interval between the deceleration and holding operations is less than a preset time.

5. The method according to claim 4, characterized in that, The step of controlling the segmented speed change of the target continuous rolling mill based on the preset parameters includes: After the shearing is completed, the initial shearing velocity is returned to normal. The speed-up operation is performed when the belt coiler of the target continuous rolling mill falls.

6. A variable speed shearing device for a continuous rolling mill, characterized in that, include: The determining unit is used to determine the preset parameters of the target continuous rolling mill under the condition of meeting the variable speed shearing conditions. The preset parameters include tension, bending roll force and roll shifting. The variable speed shearing conditions include: the connection span between the front and rear coils meets the preset requirements, the rolling setting value between the front and rear coils meets the preset requirements and non-special processes. The connection span between the front and rear coils includes the difference in yield strength between the front and rear coils, the difference in width between the front and rear coils, the difference in raw material thickness between the front and rear coils, and the difference in reduction rate between the front and rear coils. The control unit is used to control the segmented speed change of the target continuous rolling mill based on the preset parameters, wherein the speed change includes speed increase, speed decrease, holding and stopping.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed by a processor, it implements the steps of the continuous rolling mill variable speed shearing method as described in any one of claims 1 to 5.

8. An electronic device, characterized in that, The electronic device includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the steps of the continuous rolling mill speed change shearing method as described in any one of claims 1 to 5.

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