A method for controlling speed reduction of a reducing mill, a storage medium and an apparatus

Abstract

The embodiment of the application provides a diameter reducing machine speed drop control method, a storage medium and equipment, and belongs to the technical field of wire production. The method comprises the following steps: collecting a first torque value of the diameter reducing machine in a first state; collecting a second torque value of the diameter reducing machine in a second state; obtaining a first tension value between a final rolling machine motor of a finishing rolling mill group and the diameter reducing machine according to a difference between the first torque value and the second torque value; taking the first tension value as a reference to calculate equivalent tension values of the diameter reducing machine and each rolling machine motor of the finishing rolling mill group; calculating speed drop coefficients of the first tension value and each equivalent tension value respectively; and tracking a position of a tail of a rolled piece, when the tail of the rolled piece is separated from each rolling machine motor of the finishing rolling mill group one by one, controlling a speed of the diameter reducing machine according to the corresponding speed drop coefficients. The method is used for controlling a material type of a production line and improving a material yield.

Description

Technical Field

[0001] This invention relates to the field of wire production technology, and more specifically to a method, storage medium, and equipment for controlling the speed reduction of a reducing machine. Background Technology

[0002] In modern high-speed wire rod production, to meet the requirements of controlled rolling and cooling processes, the process distance between the finishing mill stand and the reducing mill stand is typically as long as 80 meters, with rolling speeds exceeding 80 m / s. This long-distance, high-speed rolling process results in the rolled piece being in a free rolling state after the tail of the rolled piece leaves the last stand of the finishing mill due to the loss of tension from the finishing mill stand. At this point, due to metal accumulation at the tail of the rolled piece, the tail profile is excessively large compared to the normal profile in the middle section. This is transmitted to the finished product shape, manifesting as 30-40 "ears" (or "tail bursting") at the tail of the finished product, meaning the product profile is severely out of tolerance. This part becomes scrap, requiring extensive trimming in subsequent processes, significantly reducing the yield. If the tail is controlled to be smaller by adjusting the profile before the finishing mill, it will cause the dimensions of the rolled piece in the middle section to deviate negatively, failing to meet the precision requirements of the finished product.

[0003] Because existing technologies lack equipment such as loopers for adjusting tension, and cannot directly observe the tension of hot-rolled parts running at high speeds, the material profile of the production line is difficult to control, resulting in a low yield. Summary of the Invention

[0004] The purpose of this invention is to provide a method, storage medium, and equipment for controlling the speed drop of a reducing mill, used to control the material profile in the production line and improve the yield.

[0005] To achieve the above objectives, in a first aspect, embodiments of the present invention provide a speed reduction control method for a reducing mill. The method includes: acquiring a first torque value of the reducing mill in a first state, wherein the first state is a stable rolling state of the workpiece before it leaves the tail of the finishing mill's final mill motor; acquiring a second torque value of the reducing mill in a second state, wherein the second state is a stable rolling state of the workpiece after it leaves the tail of the finishing mill's final mill motor and re-enters the finishing mill; obtaining a first tension value between the finishing mill's final mill motor and the reducing mill based on the difference between the first torque value and the second torque value; calculating the equivalent tension value between each mill motor of the finishing mill and the reducing mill based on the first tension value; calculating the speed reduction coefficient of the first tension value and each of the equivalent tension values ​​respectively; and tracking the position of the workpiece tail, and controlling the speed of the reducing mill according to the corresponding speed reduction coefficient as the workpiece tail successively leaves each mill motor of the finishing mill.

[0006] Optionally, collecting the first torque value of the reducing mill in the first state includes: collecting the first torque feedback value of the reducing mill under a preset rolling process in the first state; and filtering the first torque feedback value to obtain the first torque value, wherein the preset rolling process is the process in which the reducing mill rolls 60%-90% of the length range of the workpiece.

[0007] Optionally, collecting the second torque value of the reducing mill in the second state includes: after the rolled piece is de-tailed from the end mill motor of the finishing mill, collecting the set speed of the reducing mill and continuously monitoring the changing trend of the speed feedback value of the reducing mill; when the speed feedback value reaches the set speed and after the set speed stabilizes for a preset time, determining that the reducing mill enters the second state; collecting the second torque feedback value of the reducing mill in the second state; and filtering the second torque feedback value to obtain the second torque value.

[0008] Optionally, the method for calculating the first tension value between the finishing mill motor and the reducing mill includes: , in, The first tension value, This is the first torque value. This is the second torque value.

[0009] Optionally, based on the first tension value, the equivalent tension values ​​of each mill motor in the finishing mill and the reducing mill are calculated, including: , , ……, , in, The first tension value, The tension value between the second-to-last mill motor of the finishing mill and the reducing mill. The tension value between the third-to-last mill motor of the finishing mill unit and the reducing mill. The last one in the finishing mill The tension value between the rolling mill motor and the reducing mill. , and The equivalent tension coefficients for each rolling mill motor are given. The number of mill motors in the finishing mill unit.

[0010] Optionally, calculating the descent coefficients of the first tension value and each of the equivalent tension values ​​includes: , , ……, , in, As the baseline speed drop coefficient, , and The gradient speed drop coefficients are for each rolling mill motor. This is the total tension adjustment coefficient. This is the first torque value.

[0011] Optionally, when the rolled piece exits each mill motor of the finishing mill unit one by one at the tail end, controlling the speed of the reducing mill according to the corresponding speed drop coefficient includes: applying the reference speed drop coefficient to the speed setpoint of the reducing mill when the rolled piece passes the last mill motor at the tail end; and controlling the speed of the reducing mill when the rolled piece passes the second-to-last mill motor, the third-to-last mill motor, and the last mill motor of the finishing mill unit at the tail end. When the rolling mill motors are in operation, the speed reduction coefficients corresponding to each rolling mill motor are applied to the speed setpoint of the reducing mill.

[0012] Optionally, the method further includes: after the rolled piece passes through the reducing mill at the tail end, restoring the speed of the reducing mill to a set speed.

[0013] Optionally, the method for calculating the speed of the reducing mill includes: , in, The speed of the reducing mill is given. To set the speed, This is the rate of decrease coefficient.

[0014] Optionally, the method further includes: if the rate of descent is less than 0.005, then setting the rate of descent to 0.005; and if the rate of descent is greater than 0.05, then setting the rate of descent to 0.05.

[0015] Secondly, embodiments of the present invention provide a machine-readable storage medium storing instructions that cause a machine to perform the method described thereon.

[0016] Thirdly, embodiments of the present invention provide a device for controlling the speed drop of a reducing mill, the device comprising a memory and a processor, characterized in that the processor is used to run a program, wherein the program is used to execute the method described when it is run.

[0017] The above technical solution measures the tension value between the final mill motor and the reducing mill in the finishing mill unit, and fits the equivalent tension values ​​of several mill motors preceding the finishing mill unit. Then, by tracking the tail end of the rolled piece, the reducing mill achieves a gradual descent as the tail end of the rolled piece is ejected from each stand within the finishing mill unit. Through this gradual gradient tension compensation, the tension value at the tail end of the rolled piece remains constant during the gradual ejection process in the finishing mill unit. This allows for precise control of the tail dimension, elimination of finished product bump defects, better control of material profile on the production line, and improved yield.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a typical process equipment configuration provided in an embodiment of the present invention; Figure 2 This is a flowchart illustrating a speed reduction control method for a reducing mill provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the dynamic process of the No. 27 rolling mill motor provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a reducing mill speed reduction control system provided in an embodiment of the present invention; Figure 5 This is a flowchart illustrating another method for controlling the speed drop of a reducing mill provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the speed gradient compensation process for the No. 27 rolling mill motor provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the device provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures 101. Processor; 102. Memory; 103. Bus; 10. Equipment. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0022] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with relevant laws and regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0023] Figure 1 This is a schematic diagram of a typical process equipment configuration provided in an embodiment of the present invention. Figure 1 For example, this process equipment is equipped with an 8-roll finishing mill, a reducing mill, and a sizing mill. The finishing mill includes four main motors: #23, #24, #25, and #26, each driving two rolls. The reducing mill is a 2-roll mill with two main motors: #27 and #28, each driving one roll. The sizing mill is also a 2-roll mill with two main motors: #29 and #30, each driving one roll.

[0024] by Figure 1 Taking the illustrated process equipment as an example, in existing technology, after the rolled piece leaves the finishing mill, the first stand of the reducing mill (motor #27) is immediately decelerated. The speed difference between the #27 mill motor and the final mill motor (motor #28) of the finishing mill creates a steel-pulling effect, controlling the material shape at the tail end. However, in practice, the deceleration percentage is usually manually set by the operator based on experience, lacking scientific basis. A fixed deceleration value cannot adapt to changes in steel grade, specifications, temperature, or roll wear. A fixed deceleration value is insufficient to cover the complex dynamic rolling process, leading to unstable control effects, easily causing steel pile-up or breakage accidents, and resulting in a low yield.

[0025] To address the problems existing in the prior art, this invention proposes a speed reduction control method for a reducing mill, such as... Figure 2 As shown, the method includes the following steps S1 to S6.

[0026] Step S1: Collect the first torque value of the reducing mill in the first state, where the first state is the stable rolling state of the workpiece before it leaves the end mill motor of the finishing mill.

[0027] Step S2: Collect the second torque value of the reducing mill in the second state, where the second state is the stable rolling state in which the workpiece re-enters after being de-tailed from the end mill motor of the finishing mill unit.

[0028] Step S3: Based on the difference between the first torque value and the second torque value, obtain the first tension value between the end mill motor of the finishing mill and the reducing mill.

[0029] Step S4: Based on the first tension value, calculate the equivalent tension values ​​of each mill motor in the finishing mill unit and the reducing mill.

[0030] Step S5: Calculate the descent coefficient of the first tension value and each of the equivalent tension values ​​respectively.

[0031] Step S6: Track the position of the tail of the rolled piece, and control the speed of the reducing mill according to the corresponding speed reduction coefficient as the tail of the rolled piece disengages from each mill motor of the finishing mill unit.

[0032] It should be noted that a reducing mill typically includes multiple mill motors. When discussing the tension between the finishing mill's final mill motor and the reducing mill, what is actually being discussed is the tension between the finishing mill's final mill motor and the first stand of the reducing mill. Therefore, in the above steps, when collecting the torque value of the reducing mill, what is actually being collected is the tension value of the first stand of the reducing mill, which is... Figure 1 The tension value of the No. 27 rolling mill motor is shown.

[0033] This invention requires collecting the torque values ​​of the #27 rolling mill motor in two states: the torque value of the #27 rolling mill motor during the stable rolling stage before tail-off, and the torque value of the #27 rolling mill motor after the workpiece has been tail-off from the last stand of the finishing mill and has re-entered a steady state. During the processes corresponding to steps S1 and S2, the middle part of the workpiece is still being rolled normally in the #27 rolling mill motor. Therefore, the rolling deformation conditions (temperature, dimensions, deformation amount) are exactly the same as during normal rolling. The only change is the loss of the back tension provided by the finishing mill. Therefore, the tension value of the workpiece can be obtained by observing the change in torque of the #27 rolling mill motor before and after rolling. It should be noted that due to the adjustment effect of the mill speed regulator, its dynamic torque value cannot accurately reflect the tension value between the mills. Therefore, sampling should only be performed after the mill motor has stabilized.

[0034] The torque regression control-based speed reduction mill control method provided in this invention measures the tension value between the final mill motor and the speed reduction mill in the finishing mill unit, fits the equivalent tension values ​​of several mill motors preceding the finishing mill unit, and then tracks the tail of the rolled piece. This allows the speed reduction mill to gradually decrease as the rolled piece is ejected from each stand in the finishing mill unit. Through this gradual gradient tension compensation, the tension value at the tail of the rolled piece remains constant during the gradual ejection process in the finishing mill unit. This enables precise control of the tail dimension, eliminates finished product bump defects, better controls the material profile on the production line, and improves the yield.

[0035] Furthermore, the method provided in this embodiment of the invention can be executed automatically, avoiding the problems of unstable control effect and easy steel stacking or steel breakage accidents caused by manual settings.

[0036] Furthermore, the acquisition of the first torque value of the reducing mill in the first state includes: acquiring the first torque feedback value of the reducing mill under the preset rolling process in the first state; and filtering the first torque feedback value to obtain the first torque value, wherein the preset rolling process is the process in which the reducing mill rolls 60%-90% of the length range of the workpiece.

[0037] By selecting a length range of 60%-90%, unstable areas at the head and tail of the rolled piece can be avoided, ensuring the stability of the collected data. Furthermore, the collected data may contain noise; filtering eliminates noise interference, improving data accuracy.

[0038] Furthermore, acquiring the second torque value of the reducing mill in the second state includes: after the rolled piece is de-tailed from the end mill motor of the finishing mill, acquiring the set speed of the reducing mill and continuously monitoring the changing trend of the speed feedback value of the reducing mill; when the speed feedback value reaches the set speed and after the set speed stabilizes for a preset time, determining that the reducing mill enters the second state; acquiring the second torque feedback value of the reducing mill in the second state; and filtering the second torque feedback value to obtain the second torque value.

[0039] After the rolled piece is removed from the end mill motor of the finishing mill, wait for the speed feedback value to stabilize at the set speed for a certain period of time before considering that the reducing mill has entered a stable rolling state. Data should then be collected at this point to ensure accuracy.

[0040] Figure 3 This is a schematic diagram of the dynamic process of the #27 rolling mill motor provided in an embodiment of the present invention. During this dynamic process, the speed setting of the #27 rolling mill motor remains constant. Time, in milliseconds (ms). The moment when the tail of the rolled piece leaves the finishing mill. This refers to the moment when the torque of the #27 rolling mill motor stabilizes. Please refer to [reference needed]. Figure 3 In practice, collecting the first torque value and the second torque value includes the following steps S101 to S105.

[0041] Step S101: The parameters of the frequency conversion drive device of the reducing mill are precisely adjusted to ensure that it has a dynamic adjustment characteristic of 0.25%S.

[0042] Step S102: Do not use the tension compensation function of the reducing machine, that is, use the preset speed N-set.

[0043] Step S103: Record the specifications and rolling speed of the currently rolled product.

[0044] Step S104: Extract the torque feedback value for 60%-90% of the length during the reducing mill rolling process. After filtering, use it as the torque value of the 27# mill in the stable rolling stage before tail-off, i.e., the first torque value. Among them, the real-time sampled torque value of the No. 27 rolling mill motor. like Figure 3 As shown in the tT curve, the torque values ​​at each time point are obtained from this curve.

[0045] Step S105: Record At the moment the tail of the rolling mill leaves the finishing mill, the set speed and speed feedback value of the reducing mill are as follows: Figure 3 The tn curve is shown. Using the speed feedback value of the reducing mill as the core comparison parameter, when the speed feedback value of the reducing mill experiences an increase, a decrease, and then stabilizes again at the set speed... At a given moment, and after a delay of approximately 200ms, the current torque feedback value of the reducing mill is recorded. This value is the torque value of the workpiece after it leaves the last stand of the finishing mill and re-enters the steady state of the No. 27 rolling mill, i.e., the second torque value. .

[0046] After obtaining the first torque value and the second torque value, the first tension value between the last stand of the finishing mill and the reducing mill is calculated based on the first torque value and the second torque value. The calculation method for the first tension value between the motor of the last stand of the finishing mill and the reducing mill includes: , in, The first tension value, This is the first torque value. This is the second torque value.

[0047] It should be noted that in the calculation of this invention, the rated torque of the reducing mill is 100%, and when calculating the tension value, the tension value is also converted to the rated torque of the reducing mill. The units of each tension value and torque value are _____.

[0048] The following is based on Figure 1 Taking the process equipment shown as an example, the calculation of the equivalent tension value is explained. When setting the rolling schedule, the tension coefficient between each roll group is preset. During normal rolling, the tension coefficients between each roll group work together to obtain the ideal material shape.

[0049] In actual production, the tension between the #26 and #27 rolling mill motors is disturbed from the moment the workpiece is ejected from the first roll group of the finishing mill (i.e., the #23 rolling mill motor). This causes a decrease in tension between the #26 and #27 rolling mill motors, which in turn reduces the tension between the #27 and #28 rolling mill motors within the reducing mill, affecting the material profile. Therefore, the #27 rolling mill motor should appropriately reduce its speed from the moment the #23 rolling mill motor ejects the workpiece to compensate for the tension reduction caused by the ejection, maintaining a constant tension between the #27 and #28 rolling mill motors, thereby stabilizing the material profile.

[0050] Because the distance between the stands in this section is relatively short (approximately 3000mm) and the rolling speed is high (up to 70m / s), it is difficult to calculate the tension value of each roll relative to the reducing mill using actual measurement methods. Therefore, this invention explores a method based on actual production, estimating the coefficient of each roll group relative to the first tension value, and adjusting it as needed according to the material type during production, achieving good results. Specifically, based on the first tension value, the equivalent tension values ​​of each mill motor in the finishing mill unit and the reducing mill are calculated as follows: , , ……, , in, The first tension value, The tension value between the second-to-last mill motor of the finishing mill and the reducing mill. The tension value between the third-to-last mill motor of the finishing mill unit and the reducing mill. The last one in the finishing mill The tension value between the rolling mill motor and the reducing mill. , and The equivalent tension coefficients for each rolling mill motor are given. The number of mill motors in the finishing mill unit.

[0051] by Figure 1 Taking the process equipment shown as an example, It is 4. This refers to the tension value between the No. 26 rolling mill motor and the reducing mill. This refers to the tension value between the #25 rolling mill motor and the reducing mill. This refers to the tension value between the #24 rolling mill motor and the reducing mill. This refers to the tension value between the No. 23 rolling mill motor and the reducing mill. , and These are the equivalent tension coefficients corresponding to the #25 rolling mill motor, #24 rolling mill motor, and #23 rolling mill motor, respectively.

[0052] In actual production, this equivalent tension coefficient is affected by various factors such as material profile adjustment, roll ring wear, and mill speed adjustment. However, under stable production mode, its parameters are relatively fixed and can be adjusted gradually with production. Taking a high-speed wire rod production line as an example, its parameters are shown in Table 1. In other embodiments of the present invention, the equivalent tension coefficient can be set to other values ​​according to actual production conditions, and the present invention is not limited thereto.

[0053] Table 1: Correspondence of Equivalent Tension Coefficients for Rolling Specifications

[0054] The core control concept of this invention is to use the normal rolling torque before tail removal. To control the target, the speed of the No. 27 mill motor is adjusted in stages as the rolled piece exits each roll group of the finishing mill by tracking its tail end, thereby controlling the real-time torque of the No. 27 mill motor. The torque value of the No. 27 rolling mill in the stable rolling stage before tail-off Specifically, the velocity gradient compensation algorithm includes the calculation of the following given velocity of the reducing machine: , in, The speed of the reducing mill is given, in m / s; The set speed is the pre-set speed for normal rolling, measured in m / s. This is the rate of decrease coefficient.

[0055] Furthermore, the rate of decrease The calculation of the descent coefficients for the first tension value and each of the equivalent tension values ​​is divided into a baseline descent coefficient and a gradient descent coefficient. , , ……, , in, As the baseline speed drop coefficient, , and The gradient speed drop coefficients are for each rolling mill motor. This is the total tension adjustment coefficient. This is the first torque value.

[0056] Furthermore, when the rolled piece exits each mill motor of the finishing mill unit one by one at the tail end, controlling the speed of the reducing mill according to the corresponding speed drop coefficient includes: applying the reference speed drop coefficient to the speed setpoint of the reducing mill when the rolled piece passes the last mill motor at the tail end; and when the rolled piece passes the second-to-last mill motor, the third-to-last mill motor, and the last-to-last mill motor of the finishing mill unit at the tail end... When the rolling mill motors are in operation, the speed reduction coefficients corresponding to each rolling mill motor are applied to the speed setpoint of the reducing mill.

[0057] Furthermore, the method also includes: after the rolled piece passes through the reducing mill at its tail end, restoring the speed of the reducing mill to a set speed. After the speed reduction control for a single rolled piece is completed, the speed of the reducing mill is promptly reset to avoid affecting the normal rolling of the next rolled piece, thus achieving continuous rolling.

[0058] It is important to note that due to the high-speed nature of this process, excessive or rapid parameter adjustments pose a significant risk of steel buildup. Overall adjustments should be made gradually, while ensuring stable rolling. Simultaneously, the rate of decrease should be carefully considered. Amplitude should be limited to prevent the influence of disturbances during rapid dynamic processes. In practical applications, the rate drop coefficient should be considered. Generally, a value between 0.005 and 0.05 is preferable. Therefore, if the descent coefficient is less than 0.005, then the descent coefficient is set to 0.005; and if the descent coefficient is greater than 0.05, then the descent coefficient is set to 0.05.

[0059] The present solution will be further described in detail below with reference to specific embodiments. It should be noted that the scope of protection of the present solution is not limited to the following embodiments.

[0060] Example 1: Figure 4 This is a schematic diagram of the structure of a reducing mill speed reduction control system provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the system includes a PLC control system, a variable frequency drive control system, a human-machine interface, a network system, and field detection components. This system is a typical system architecture for wire rod production, and the method of this embodiment can be implemented based on this system.

[0061] Due to the high throughput of the rolled piece in high-speed rolling operations—for example, in a typical high-speed wire rod mill, the rolling speed of a Φ5.5mm piece is approximately 70m / s—the control system must communicate rapidly with the frequency converter drive systems of the finishing mill, reducing mill, and sizing mill to achieve fast data acquisition and control adjustments. In this embodiment, a Profinet fieldbus based on isochronous synchronization is used, with a communication update cycle of 1ms between the field I / O detection and the frequency converter drive. The frequency converter drive employs products with high-performance vector control or direct torque control technology to support rapid input from the control system and achieve rapid response from the frequency converter drive.

[0062] Figure 5 This is a flowchart illustrating another method for controlling the speed drop of a reducing mill provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the overall implementation process of the system includes steps S11 to S19.

[0063] Step S11: Start the production line and begin rolling.

[0064] Step S12: Obtain the current rolled product specifications.

[0065] Step S13: Adjust the process and speed to ensure the intermediate material is qualified.

[0066] Step S14: Record the rolling torque value of the middle section of the No. 27 rolling mill motor.

[0067] Step S15: Record the tension value between the last stand of the finishing mill and the reducing mill.

[0068] Step S16: Set the various control coefficients for speed compensation, i.e., the equivalent tension coefficients.

[0069] Step S17: Calculate the given speed and implement speed compensation control.

[0070] Step S18: Adjust the control coefficients based on application feedback.

[0071] Step S19: Calculation ends.

[0072] Figure 6 This is a schematic diagram of the speed gradient compensation process for the No. 27 rolling mill motor provided in an embodiment of the present invention. Figure 6 For example, when rolling a certain workpiece, the speed reduction control of the 27# rolling mill motor includes the following steps S21 to S26.

[0073] Step S21: Obtain the current rolled product specifications and adjust each control coefficient, that is, find the corresponding equivalent tension coefficient according to the rolling specifications.

[0074] Step S22: Determine whether the tail of the rolled piece passes the motor of the finishing mill #23. If the result is "yes", calculate the gradient descent coefficient. and based on Accelerate the speed reduction of the No. 27 rolling mill motor; if the result is "No", continue to wait and cyclically judge.

[0075] Step S23: Determine whether the tail of the rolled piece passes the motor of the finishing mill #24. If the determination result is "yes", calculate the gradient descent coefficient. and based on Accelerate the speed reduction of the No. 27 rolling mill motor; if the result is "No", continue to wait and cyclically judge.

[0076] Step S24: Determine whether the tail of the rolled piece passes the motor of the finishing mill #25. If the determination result is "yes", calculate the gradient descent coefficient. and based on Accelerate the speed reduction of the No. 27 rolling mill motor; if the result is "No", continue to wait and cyclically judge.

[0077] Step S25: Determine whether the tail of the rolled piece passes the motor of the finishing mill #26. If the determination result is "yes", calculate the reference speed drop coefficient. and based on Accelerate the speed reduction of the No. 27 rolling mill motor; if the result is "No", continue to wait and cyclically judge.

[0078] Step S26: Determine whether the tail of the rolled piece passes the motor of the finishing mill #27. If the result is "yes", cancel the speed reduction superimposed on the motor of the finishing mill #27 and restore its speed to the set speed; if the result is "no", continue to wait and cyclically determine.

[0079] This invention provides a machine-readable storage medium storing instructions that cause a machine to perform the method described thereon.

[0080] This invention also provides a device for controlling the speed drop of a reducing mill, for example, such as... Figure 7 As shown, the device includes a memory and a processor, the processor being used to run a program, wherein the program is run to perform the method described.

[0081] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and speed reduction control of the reducing machine is achieved by adjusting the kernel parameters.

[0082] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0083] 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.

[0084] 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 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... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0085] 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.

[0086] 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.

[0087] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0088] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0089] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0090] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0091] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for controlling the speed drop of a reducing mill, characterized in that, The method includes: The first torque value of the reducing mill in the first state is collected. The first state is the stable rolling state of the workpiece before it is removed from the end mill motor of the finishing mill group. The second torque value of the reducing mill in the second state is collected. The second state is the stable rolling state that the workpiece re-enters after being de-tailed from the end mill motor of the finishing mill group. The first tension value between the finishing mill motor and the reducing mill is obtained based on the difference between the first torque value and the second torque value. Based on the first tension value, calculate the equivalent tension values ​​of each mill motor in the finishing mill unit and the reducing mill. Calculate the descent coefficients of the first tension value and each of the equivalent tension values ​​respectively; and Tracking the position of the tail of the rolled piece, as the tail of the rolled piece successively leaves each mill motor of the finishing mill, the speed of the reducing mill is controlled according to the corresponding speed reduction coefficient.

2. The method according to claim 1, characterized in that, The first torque value of the reducing mill in the first state includes: The first torque feedback value of the reducing mill under the preset rolling process in the first state is collected; and The first torque feedback value is filtered to obtain the first torque value. The preset rolling process is the process by which the reducing mill rolls 60%-90% of the length of the workpiece.

3. The method according to claim 1, characterized in that, The second torque value of the reducing mill in the second state includes: After the rolled piece is de-tailed from the end mill motor of the finishing mill, the set speed of the reducing mill is collected, and the changing trend of the speed feedback value of the reducing mill is continuously monitored. When the speed feedback value reaches the set speed, and after the set speed has been stable for a preset time, it is determined that the reducing machine enters the second state; The second torque feedback value of the reducing mill in the second state is collected; and The second torque feedback value is filtered to obtain the second torque value.

4. The method according to claim 1, characterized in that, The method for calculating the first tension value between the finishing mill motor and the reducing mill includes: ， in, The first tension value, This is the first torque value. This is the second torque value.

5. The method according to claim 1, characterized in that, Based on the first tension value, the equivalent tension values ​​of each mill motor in the finishing mill and the reducing mill are calculated as follows: ， ， ……， ， in, The first tension value, The tension value between the second-to-last mill motor of the finishing mill and the reducing mill. The tension value between the third-to-last mill motor of the finishing mill unit and the reducing mill. The last one in the finishing mill The tension value between the rolling mill motor and the reducing mill. , and The equivalent tension coefficients for each rolling mill motor are given. The number of mill motors in the finishing mill unit.

6. The method according to claim 5, characterized in that, The calculation of the descent coefficients for the first tension value and each of the equivalent tension values ​​includes: ， ， ……， ， in, As the baseline speed drop coefficient, , and The gradient speed drop coefficients are for each rolling mill motor. This is the total tension adjustment coefficient. This is the first torque value.

7. The method according to claim 6, characterized in that, As the rolled piece sequentially exits each mill motor of the finishing mill unit at its tail end, controlling the speed of the reducing mill according to the corresponding speed drop coefficient includes: As the rolled piece passes the end mill motor, the reference speed drop coefficient is applied to the speed setpoint of the reducing mill; and At the tail of the rolled piece, the second-to-last and third-to-last mill motors of the finishing mill unit pass through the... When the rolling mill motors are in operation, the speed reduction coefficients corresponding to each rolling mill motor are applied to the speed setpoint of the reducing mill.

8. The method according to claim 7, characterized in that, The method further includes: After the rolled piece passes through the reducing mill at its tail end, the speed of the reducing mill is restored to the set speed.

9. The method according to claim 7, characterized in that, The calculation method for the speed of the reducing mill includes: ， in, The speed of the reducing mill is given. To set the speed, This is the rate of decrease coefficient.

10. The method according to claim 1, characterized in that, The method further includes: If the rate of descent coefficient is less than 0.005, then set the rate of descent coefficient to 0.005; and If the rate of descent is greater than 0.05, then the rate of descent is set to 0.

05.

11. A machine-readable storage medium having instructions stored thereon for causing a machine to perform the method as described in any one of claims 1-10.

12. A device for controlling the speed drop of a reducing mill, the device comprising a memory and a processor, characterized in that, The processor is used to run a program, wherein the program is run to execute the method as described in any one of claims 1-10.

Images