A method of saving electrical consumption of a bar

Abstract

This invention relates to the field of section steel rolling technology and discloses a method for saving electricity consumption in bar milling. The method includes: establishing optimized rolling parameters to increase the mill exit speed; establishing a bar position tracking model, which calculates the theoretical position based on the exit speed, performs online calibration using physical verification points, and updates the bar length in response to signals from the length-cutting device to obtain the calibrated head and tail positions; and implementing energy-saving control on the conveyor roller motor, which integrates the activation window generated based on the calibrated head and tail positions and signals from physical devices in specific sections to determine motor start and stop. This invention, by constructing a tracking model with self-calibration and dynamic update functions and combining it with physical signals for composite judgment, ensures that the operation of the conveyor motor accurately matches the actual load state of the bar, reducing equipment idling and lowering energy consumption while ensuring production reliability.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, specifically a method for saving electricity consumption in bar rolling. Background Technology

[0002] In the bar rolling process, the high-temperature bars after rolling need to undergo subsequent processing such as cooling, shearing, and collection via a conveyor line consisting of numerous conveyor rollers. These conveyor rollers are driven by a large number of motors, and their total operating energy consumption accounts for a significant proportion of the overall production cost. Therefore, effectively controlling the operation of the conveyor roller motors to reduce unnecessary energy consumption is a technical issue of ongoing concern in this field.

[0003] In existing technologies, the control of conveyor roller motors typically employs a regional management approach. This involves dividing the entire conveyor line into several fixed sections, and using sensors such as photoelectric switches installed at the section entrances or exits to trigger the start and stop of all motors within that section. The control unit in this method is a pre-defined physical section with a fixed and relatively large spatial range, not directly related to the actual length and position of the bar. When a bar enters a section, all motors within that section start regardless of whether they are carrying a bar, resulting in prolonged unloaded idling before the bar's head arrives and after its tail leaves, leading to wasted electrical energy.

[0004] To improve this situation, some control strategies estimate the bar's transit time based on its specifications, combined with timers or fixed speed parameters. However, this approach cannot adapt to real-time fluctuations in rolling speed and uncertainties such as roller slippage during production, leading to a discrepancy between control timing and the actual bar position. Furthermore, the physical length of the bar changes after it is sheared by the shearing device on the conveyor line. Existing control logic typically lacks the ability to acquire and process this length change information in real time, still relying on the initial length of the bar for control. This results in unnecessary idling of the rollers behind the sheared bar.

[0005] Some methods that attempt to predict the position of the bar stock using models also suffer from a lack of effective online calibration mechanisms. As the conveying distance increases, the cumulative error between the model-calculated position and the actual physical position increases. The accuracy of the output results is insufficient to support precise start-stop control of a single or small-scale motor unit, thus limiting its application in actual production. Summary of the Invention

[0006] The technical problem to be solved by this invention is that in the existing bar rolling production process, there are limitations in the rolling process that prevent the full release of production capacity, and unnecessary idling of the finishing zone conveying equipment, which together lead to the problem of high electricity consumption per ton of bar.

[0007] To address the aforementioned technical problems, this invention provides a method for saving electricity consumption in bar production. This method combines process source optimization with refined dynamic control of the conveying process, thereby reducing energy consumption during equipment idling while ensuring stable and reliable production.

[0008] The present invention provides a method for saving electricity consumption in bar stock, comprising the following steps:

[0009] S1. Establish a set of optimized rolling parameters, including the mill exit speed after lifting, used to calculate the initial position of the bar.

[0010] S2. Establish and run a bar position tracking model to obtain the calibrated head position and calibrated tail position of the bar. The model performs the following operations:

[0011] S21. Based on the improved mill exit speed, calculate the theoretical head position and theoretical tail position of the bar.

[0012] S22. Introduce the state of physical verification points to calibrate the theoretical head position to obtain the calibrated head position;

[0013] S23. In response to the shearing signal of the fixed-length shearing device on the conveyor line, update the length of the bar, and update the calibrated tail position based on the updated length and the calibrated head position.

[0014] S3. Perform energy-saving control on the conveyor roller motors in one or more preset control sections on the conveyor line. The execution of the energy-saving control integrates the following information:

[0015] The activation window generated based on the calibrated head position and the calibrated tail position obtained in step S2, and the signal from the physical device in the preset control section, is used to determine and execute the start and stop of the conveyor roller motor.

[0016] This invention constructs an online self-calibrating bar position tracking model to obtain high-precision real-time position and length information of the bars. Based on this information, and in conjunction with necessary physical device signals, it performs collaborative judgment to dynamically and precisely control the start and stop of the motors on the conveyor line. This method ensures that the operation of the conveyor motor is highly matched with the actual load-bearing state of the bars, avoiding equipment idling caused by fixed start-stop modes or purely physical sensing delays, thereby achieving the technical effect of saving energy consumption.

[0017] In a preferred embodiment, step S1 establishes a set of optimized rolling parameters, specifically achieved in the following manner:

[0018] Increasing the number of rolling passes and redistributing the reduction in each pass allows for an increase in the mill exit speed. This optimizes the rolling load distribution, eliminates the bottleneck restricting production speed, and macroscopically increases output per unit time, thereby distributing the energy consumption of stationary equipment.

[0019] In one specific embodiment, step S21, calculating the theoretical head position and theoretical tail position of the bar, specifically includes:

[0020] The mill exit speed and the start time when the hot metal detector detects the passing of the bar head are collected;

[0021] The theoretical head position of the bar is calculated based on the start time and the time integration of the exit velocity.

[0022] The theoretical tail position of the bar is calculated based on the theoretical head position and the preset theoretical length of the finished bar.

[0023] Among them, the theoretical head position The calculation formula is:

[0024] ;

[0025] In the formula, The start time is... For the current time, The mill exit speed is denoted as .

[0026] In one specific embodiment, the calibration of the theoretical head position in step S22 specifically includes:

[0027] The theoretical time when the theoretical head position of the bar reaches the physical verification point is recorded; the actual physical time when the bar head reaches the physical verification point is recorded; the ratio of the theoretical time to the actual physical time is calculated to obtain the dynamic drift calibration coefficient; the exit velocity is corrected using the dynamic drift calibration coefficient to obtain the calibrated head position. This calibration mechanism can compensate for model calculation errors caused by factors such as physical slippage or equipment wear, ensuring the long-term accuracy of model tracking.

[0028] Furthermore, the dynamic drift calibration coefficient is determined to be the quotient of the theoretical time and the physical real time. Its calculation formula is as follows:

[0029] ;

[0030] In the formula, The dynamic drift calibration coefficient is... For the theoretical time, The physical real time.

[0031] In one specific embodiment, updating the length of the bar in step S23 involves subtracting a fixed-length cutting length from the original length of the bar to obtain the updated length. This operation allows the model to reflect the change in the physical length of the bar after cutting in real time.

[0032] Preferably, the preset control section is the cooling bed input roller conveyor, and the energy-saving control in step S3 is applied to the cooling bed input roller conveyor, and its execution is based solely on determining the start and stop of the conveyor roller conveyor motor through the activation window.

[0033] Preferably, the preset control section is the cooling bed alignment roller conveyor. The energy-saving control in step S3 is applied to the cooling bed alignment roller conveyor, and the execution integrates the activation window and the preset functional section information within the cooling bed alignment roller conveyor. The functional section information serves as a signal for the physical device. The functional section information includes a speed-up operation section or an interval operation section.

[0034] Preferably, the preset control section is the cooling bed output roller conveyor, on which the length-cutting device and the physical detection device are installed. The energy-saving control in step S3 is applied to the cooling bed output roller conveyor, and its execution integrates the activation window and the confirmation signal from the physical detection device. The confirmation signal is used to double-confirm the stop command. This composite judgment logic ensures the reliability of the energy-saving stop operation.

[0035] In one specific embodiment, the activation window is defined as a spatial range, the starting point of which is the calibrated tail position minus a backward safety redundancy distance, and the ending point of which is the calibrated head position plus a forward safety redundancy distance. Its range W t Determined by the following formula:

[0036] ;

[0037] In the formula, The calibrated tail position, The calibrated head position, This refers to the forward safety redundancy distance. This refers to the backward safety redundancy distance.

[0038] This invention provides a method for saving electricity consumption in bar stock manufacturing. It has the following beneficial effects:

[0039] 1. This invention establishes a bar position tracking model and introduces physical verification points to calibrate the model online, enabling the calculation of the calibrated head and tail positions of the bar. Based on this position information, an activation window is dynamically generated, and the start and stop of the conveyor roller motor are controlled accordingly. This ensures that the motor's running time precisely corresponds to the actual bar passage time, thereby reducing the non-load-bearing idling time of the conveying equipment caused by fixed area control or sensing delays, and lowering energy consumption.

[0040] 2. This invention updates the length of the bar in real time in response to the shearing signal from the fixed-length shearing device within the bar position tracking model, thereby updating the calibrated tail position and the length of the activation window. This method enables energy-saving control to dynamically adapt to the gradual shortening of the bar's physical length after shearing, ensuring that the activation window always matches the changing bar size throughout the entire conveying process, achieving continuous energy-saving control over the entire conveying process.

[0041] 3. This invention, when performing energy-saving control on the conveyor roller motor within a preset control section, integrates activation window information with signals from physical devices within that section for judgment. For example, in the cooling bed output roller conveyor, the execution of a stop command requires dual confirmation from both the activation window and the physical detection device. This composite control logic, combining model calculation and physical sensing, achieves precise energy-saving control while utilizing signals from physical devices as final confirmation, ensuring the reliability of control decisions and avoiding production accidents caused by potential risks inherent in pure model calculation. Attached Figure Description

[0042] Figure 1 This is a flowchart illustrating a method for saving electricity consumption of bar stock according to an embodiment of the present invention. Detailed Implementation

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] The method of this invention can be executed by an energy-saving control system for bar conveying. This system includes a central controller, which can be a programmable logic controller or an industrial control computer. The central controller is connected to the production control system (Level 2 system) via a communication interface to receive data including the theoretical length of the finished bar. Production planning data, including those included.

[0045] Meanwhile, the central controller connects to field devices via input / output (I / O) modules. Its inputs include: those for acquiring the real-time exit speed of the bar stock. The rolling mill motor encoder signal interface is used to obtain the start time. The system includes a hot metal detector signal interface, a physical verification point sensor signal interface for calibrating the model, a fixed-length shearing device status signal interface for responding to shearing actions, and a physical detection device signal interface for double verification.

[0046] The output of the central controller is connected to the driver of each conveyor roller motor on the conveyor line to send start / stop or speed adjustment commands. The bar position tracking model and energy-saving control logic run as software programs within the central controller.

[0047] See attached document Figure 1 , Figure 1 This is a schematic flowchart of a method for saving electricity consumption in bar stock according to an embodiment of the present invention. The method for saving electricity consumption in bar stock provided by the present invention may include the following steps in its overall flow:

[0048] First, in step S1, an optimized set of rolling parameters is established. This step involves adjusting the rolling process, such as increasing the number of rolling passes and redistributing the reduction in each pass, to increase the exit speed of the last mill stand. This increased mill exit speed will serve as the basis for calculating the bar position in subsequent steps.

[0049] Next, in step S2, a bar position tracking model is established and run. The core function of this model is to track the physical position and shape of each bar on the conveyor line in real time and with high accuracy. This step contains several sub-operations:

[0050] First, based on the improved mill exit speed established in step S1, and combined with the time signal from the field detection equipment, the theoretical head position and theoretical tail position of the bar are calculated.

[0051] Subsequently, to ensure the accuracy of the model calculations, the status information of physical verification points installed on the conveyor line was introduced. By comparing the theoretical arrival time of the bar at this point with the actual arrival time, the model was calibrated online, resulting in a corrected and more accurate head position after calibration.

[0052] Furthermore, the model can also respond to shearing signals emitted by the length-cutting device on the conveyor line. Whenever a shearing action occurs, the model updates the length data of the bar in real time, and based on this updated length and the calibrated head position, recalculates a calibrated tail position that is synchronized with the actual physical state.

[0053] Finally, in step S3, energy-saving control is performed on the conveyor roller motors in one or more preset control sections on the conveyor line. This control decision is not based on a single piece of information, but rather integrates information from two aspects:

[0054] On one hand, it is an activation window dynamically generated based on the calibrated head and tail positions output by the model in step S2; on the other hand, it is a signal from a specific physical device within a preset control section. The activation window is determined as a dynamic range covering the actual space occupied by the rod, and its range is determined by the following formula:

[0055] ;

[0056] In the formula, Represents the passage of time The active window changes; This represents the tail position after calibration at time t; This represents the head position after calibration at time t; This represents the forward safety redundancy distance set to ensure smooth conveying; This represents the backward safety redundancy distance set to ensure smooth conveying.

[0057] The control system determines and executes the start and stop operations of each motor based on the correspondence between the activation window and the physical position of the conveyor roller motor, and in conjunction with the signals from the physical device, so that the operation of the motor is precisely matched with the actual presence of the bar and the conveying requirements.

[0058] Before implementing the energy-saving control method of this invention, it is first necessary to optimize the process parameters of the rolling production to establish a set of rolling parameters that can provide stable and reliable initial input conditions for subsequent precise control. This process corresponds to... Figure 1 Step S1 in the process.

[0059] Establish optimized rolling parameters, specifically by adjusting and redesigning existing rolling process specifications.

[0060] In one specific implementation, this process includes the redistribution of rolling passes and reduction, and on this basis, the increase of rolling speed.

[0061] First, the rolling passes and loads are redistributed. For specific bar products, the motor load rate of each mill stand under the existing rolling process is analyzed. When it is found that the motor load of some stands (especially the end stands of the finishing mill) is close to or has reached its rated value, thus limiting further increases in the overall rolling line speed, the rolling process for that product is modified. The modification method is to activate previously unused spare stands on the rolling line, thereby increasing the total number of rolling passes, while ensuring the final cross-sectional dimensions and mechanical properties of the product. For example, the process that originally used 16 passes is adjusted to use 18 passes.

[0062] With the increase in the number of passes, the original total reduction is redistributed. The larger reductions that were previously concentrated on a few passes are now more evenly distributed across all rolling passes, including the newly added ones. This redistribution of reduction ensures a more balanced rolling force on each mill stand during the rolling process, preventing localized motor overload from becoming a bottleneck for overall line speed increases. In this way, the potential production capacity of the entire rolling line is released.

[0063] After optimizing the distribution of rolling load, the rolling speed can be increased. Since the load on each stand is within a more reasonable and safe range, the target exit speed of the last finishing mill can be set to an increased value by adjusting the speed setpoint in the production control system (such as the L2 level system). For example, the exit speed can be increased from 15.5 m / s to 17.5 m / s.

[0064] The control system automatically calculates and issues speed commands to each upstream stand based on the target exit speed and the looper control relationship or constant flow rate principle between stands, forming a new, high-speed, and stable speed protocol. This optimized rolling parameter set ultimately includes the improved real-time exit speed of the bar output from the last mill. This will serve as a key, real-time initial input parameter for the subsequent establishment of the bar position tracking model.

[0065] See attached document Figure 1 After establishing the optimized rolling parameters, the method proceeds to step S200, where a bar position tracking model is built and run. This model is executed in a control system (e.g., a programmable logic controller (PLC) or a dedicated industrial computer), and its purpose is to provide real-time, high-precision position information of the bar on the conveyor line for subsequent energy-saving control.

[0066] In one specific implementation, the process of establishing the model and calculating the theoretical position is as follows: When a new steel billet enters the rolling line and is about to exit from the last finishing mill, the system first reads the theoretical length of the finished product multiple of the steel billet from the production control database. Meanwhile, a hot metal detector (HMD) installed after the last mill exit is used as a start signal trigger. When the HMD detects the bar head passing by, the control system captures the timestamp of that moment as the start time of tracking. .from From that moment on, the system began high-frequency acquisition of the real-time exit speed of the bars from the last rolling mill. .

[0067] Based on the above inputs, the model continuously calculates the theoretical position of the bar head by integrating the real-time exit velocity over time. In discrete digital control systems, this integral operation is implemented as a cumulative summation. If the scan period of the control system is... Then in the first Theoretical head position per scan cycle Determined by the following formula:

[0068] ;

[0069] in, This represents the peak position of the previous cycle. This refers to the instantaneous exit velocity collected in the current cycle. The theoretical tail position of the bar is calculated based on the head position and the bar length, and the calculation logic is as follows: when... Less than At that time, the tail end had not yet left the rolling mill, and its position was 0; when Greater than or equal to At that time, the tail position was To eliminate the deviation between the calculated position of the model and the actual position of the bar due to uncertainties such as slippage and roller wear in the physical world, this method introduces an online calibration mechanism. A physical calibration point is set at a predetermined position on the conveyor line, such as the middle section of the cooling bed input roller. This calibration point can be composed of a non-contact sensor (such as a photoelectric switch), whose physical position in the conveyor line coordinate system is determined. It is precisely calibrated and pre-stored in the control system.

[0070] When the model calculates the theoretical head position Reaching the verification point location At that moment, the system automatically records the system time and designates it as the theoretical time. Subsequently, when installed When the photoelectric switch at the position actually detects the passing of the rod head, the system records the system time at that moment again, which is recorded as the physical real time. The system then calculates the dynamic drift calibration coefficient based on these two timestamps. :

[0071] ;

[0072] This calibration coefficient This reflects the ratio of the theoretical average speed to the actual average speed from the mill exit to the physical verification point. This coefficient is not used for single-time position jump corrections, but rather for continuous correction of subsequent speed inputs. The model will use all subsequently acquired real-time exit speeds. Multiply by this coefficient to obtain a calibrated effective speed. Afterwards, the position calculation of the bar in the model will be entirely based on... This process allows for continuous updates and more precise calibration of the head position. .

[0073] Furthermore, the model is also capable of responding to shearing signals from the fixed-length shearing device on the conveyor line. After each shearing action, the fixed-length shearing device (such as a flying shear or a fixed-length cold shear) sends a pulse signal or a status change signal to the control system. Upon receiving this signal, the model immediately updates the internally stored length of the bar. Perform a deduction operation. Specifically, based on the original bar length... Based on this, subtract the length of a single fixed-length cut. The updated bar length is obtained. .

[0074] ;

[0075] The length update will immediately take effect on the calibrated tail position. The calculation.

[0076] because , The reduction will lead to The instantaneous forward movement allows the shape of the bar in the model to accurately reflect the actual situation of the bar being shortened in the physical world.

[0077] In one specific implementation, to ensure the stability and continuity of the calibration process, the dynamic drift calibration coefficient is adjusted. The processing has been optimized. When processing the first bar after system startup, since there is no historical data, the dynamic drift calibration coefficient... It is initialized to a preset default value, usually 1.0.

[0078] Starting with the second bar, whenever a new calculation is made... When setting a value, the system does not directly use the instantaneous value, but instead performs a smoothing filter on it and historical values ​​to generate a more stable calibration coefficient. For example, a first-order low-pass filter algorithm can be used:

[0079] ;

[0080] in, For the current number Stability calibration coefficients used for root bar stock For the current number Instantaneous calibration coefficients calculated from the bar stock. The stability calibration coefficient used for the previous bar. This is the filter coefficient (a constant ranging from 0 to 1). This method effectively suppresses drastic fluctuations in calibration results caused by accidental measurement errors or physical disturbances in a single rod.

[0081] See attached document Figure 1 After the bar position tracking model (step S2) operates stably and outputs high-precision bar position information, the method proceeds to step S3, where energy-saving control is performed on the conveyor roller motors in one or more preset control sections on the conveyor line. The core of this energy-saving control lies in using the position information output by the model to generate a dynamic activation window, and combining it with the specific control logic of different sections to achieve precise start-stop management of the roller motors.

[0082] First, the generation of the activation window and the general control principle are explained. The control system is based on the calibrated head position output by the bar position tracking model. and the position of the tail after calibration A moving activation window is generated in real time. The window's spatial range covers the entire physical length of the bar, with a preset safety redundancy distance added at both ends to ensure smooth transport of the bar during handover. Activate window. The range is determined by the following formula:

[0083] ;

[0084] in, For forward safety redundancy distance, These are the backward safety redundancy distances. These two distance values ​​can be set according to the conveyor speed and equipment response time. In the control system, each conveyor roller motor or minimum controllable motor unit on the conveyor line is assigned a unique address and its physical start and end positions in the conveyor line coordinate system are specified. The general start-stop control logic is as follows: In each control cycle, the system determines the physical position range of each motor. Is it related to the currently active window? There is a spatial intersection. If there is an intersection, a start command or a keep-run command is sent to the motor; if there is no intersection, a stop command is sent.

[0085] In one specific embodiment, the energy-saving control strategy is applied to different preset control sections of the conveyor line, and different specific execution methods are adopted according to the functional characteristics of each section.

[0086] For the input roller conveyor section of the cooling bed, its main function is to smoothly and quickly transport high-temperature bars to the cooling bed. In this section, energy-saving control integrates activation window information and preset functional section information within this section. The functional section information here serves as a signal from the physical device, and its implementation in the system is based on the precise physical calibration of the positions of the motors on each roller conveyor line. That is, the alignment roller conveyor is divided into different sections according to physical coordinates, and each section is pre-configured with its corresponding operating mode (such as speed-up mode, interval operation mode, etc.). Therefore, when the activation window enters a physically calibrated section, the preset operating mode of that section invoked by the system constitutes a response to a specific physical position state, essentially based on the position signal of the physical calibration. In this section, energy-saving control is executed solely based on the general control principle of the activation window mentioned above. That is, as the bar advances, the activation window moves synchronously, and only the motors within the window's coverage area are started, while the remaining motors are stopped. This method replaces the static strategy of shutting down the end motors according to specifications in the traditional process, and realizes full-process, dynamic tracking control of each bar.

[0087] For the alignment roller conveyor section of the cooling bed, its function, in addition to conveying, also includes sorting and aligning the bars. In this section, energy-saving control integrates activation window information and preset functional section information within the section. This functional section information serves as a signal for the physical device in the claims; it is a logical signal that defines the specific actions that the roller conveyor at a particular physical location should perform. For example, the system internally divides the alignment roller conveyor into different functional sections, such as a speed-up section at the entrance and a mid-section interval running section. When the control system determines that the head of the activation window has entered the speed-up section, it not only starts the roller conveyor motor in that section but also sets a speed 10%–15% higher than the normal speed to quickly increase the distance between the roller and the subsequent bars. When the activation window enters the interval running section, the system controls the motor in that section in an intermittent start-stop manner (e.g., start one, stop one), further saving energy while ensuring conveying capacity.

[0088] For the output roller conveyor section of the cooling bed, its function is to transport the finished bars to the collection area after sizing. In this section, due to the dynamic changes in bar length and the high reliability requirements of the conveying, energy-saving control integrates the activation window and confirmation signals from a physical detection device. This physical detection device can be a mechanical lever-proximity switch combination device installed in the latter half of the output roller conveyor. When the activation window indicates that the tail of the bar has completely left this latter half of the area, the control system generates a pre-stop command. However, this command is not executed immediately but waits for confirmation signals from the physical detection device. Only when the lever of the device is not pressed down (i.e., physically confirming no bar has passed), and its associated proximity switch changes state, sending a confirmation signal to the control system, is the pre-stop command finally executed, stopping the roller conveyor motor in that area. This dual confirmation logic of model calculation first and physical sensing confirmation ensures the safety and reliability of the shutdown operation.

Claims

1. A method for saving electricity consumption in bar stock production, characterized in that, Includes the following steps: S1. Establish a set of optimized rolling parameters, including the mill exit speed after lifting, used to calculate the initial position of the bar. S2. Establish and run a bar position tracking model to obtain the calibrated head position and calibrated tail position of the bar. The model performs the following operations: S21. Based on the improved mill exit speed, calculate the theoretical head position and theoretical tail position of the bar. S22. Introduce the state of physical verification points to calibrate the theoretical head position to obtain the calibrated head position; S23. In response to the shearing signal of the fixed-length shearing device on the conveyor line, update the length of the bar, and update the calibrated tail position based on the updated length and the calibrated head position; S3. Perform energy-saving control on the conveyor roller motors in one or more preset control sections on the conveyor line. The execution of the energy-saving control integrates the following information: the activation window generated based on the calibrated head position and the calibrated tail position obtained in step S2, and the signal from the physical device in the preset control section, to determine and execute the start and stop of the conveyor roller motor.

2. The method for saving electricity consumption of bar stock according to claim 1, characterized in that, In step S1, an optimized set of rolling parameters is established, which is specifically achieved in the following way: Increase the number of rolling passes and redistribute the reduction in each pass to increase the mill exit speed.

3. The method for saving electricity consumption of bar stock according to claim 1, characterized in that, The calculation of the theoretical head position and theoretical tail position of the bar in step S21 specifically includes: The mill exit speed and the start time when the hot metal detector detects the passing of the bar head are collected; The theoretical head position of the bar is calculated based on the start time and the time integration of the exit velocity. The theoretical tail position of the bar is calculated based on the theoretical head position and the preset theoretical length of the finished bar.

4. The method for saving electricity consumption of bar stock according to claim 1, characterized in that, The calibration of the theoretical head position in step S22 specifically includes: Record the theoretical time when the theoretical head position of the bar reaches the physical verification point; Record the actual physical time when the head of the bar actually reaches the physical verification point; The ratio of the theoretical time to the physical real time is calculated to obtain the dynamic drift calibration coefficient; The exit velocity is corrected using the dynamic drift calibration coefficient to obtain the calibrated head position.

5. The method for saving electricity consumption of bar stock according to claim 1, characterized in that, In step S23, updating the length of the rod specifically involves: The updated length is obtained by subtracting a fixed-length cutting length from the original length of the bar.

6. The method for saving electricity consumption of bar stock according to claim 1, characterized in that, The preset control section is the cooling bed input roller conveyor. The energy-saving control in step S3 is applied to the cooling bed input roller conveyor, and its execution is based solely on determining the start and stop of the conveyor roller conveyor motor through the activation window.

7. The method for saving electricity consumption of bar stock according to claim 1, characterized in that, The preset control section is the cooling bed alignment roller conveyor. The energy-saving control in step S3 is applied to the cooling bed alignment roller conveyor and executes the activation window and the preset functional section information within the cooling bed alignment roller conveyor. The functional section information serves as a signal for the physical device.

8. The method for saving electricity consumption of bar stock according to claim 1, characterized in that, The preset control section is the output roller conveyor of the cooling bed. The output roller conveyor of the cooling bed is equipped with the fixed-length shearing device and the physical detection device. The energy-saving control in step S3 is applied to the output roller conveyor of the cooling bed. Its execution integrates the activation window and the confirmation signal from the physical detection device. The confirmation signal is used to double confirm the stop command.

9. A method for saving electricity consumption of bar stock according to claim 4, characterized in that, The dynamic drift calibration coefficient is determined to be the quotient of the theoretical time and the physical real time.

10. A method for saving electricity consumption in bar stock according to claim 1, characterized in that, The activation window is defined as a spatial range, the starting point of which is the calibrated tail position minus a backward safety redundancy distance, and the ending point of which is the calibrated head position plus a forward safety redundancy distance.

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