Method, device, equipment, medium and product for starting-up multi-roller rolling mill

Abstract

The application discloses a starting control method, device, equipment, medium and product of a multi-roller mill. The method comprises the following steps: in the process of starting the multi-roller mill according to a plurality of preset stages, the side roller of the multi-roller mill is controlled to be loaded according to the corresponding stress setting value of each stage, the loading speed of the multi-roller mill and the stress setting value of the side roller of the multi-roller mill are different in different stages, the stress setting value of the side roller changes synchronously with the rolling force of the working roller of the multi-roller mill; the stress measurement value of the side roller is obtained; in the case that the stress measurement value is greater than a preset safety threshold value, the loading speed of the multi-roller mill and the rolling force of the working roller are controlled to be unchanged, and the stress setting value of the side roller is reduced by a preset value. According to the embodiment of the application, the instantaneous stress peak value of the side roller can be offset, and the load overrun jump stop fault can be avoided.

Description

Technical Field

[0001] This application belongs to the field of metal processing technology, and in particular relates to a start-up control method, device, equipment, medium and product for a multi-roll mill. Background Technology

[0002] The 18-roll mill is widely used for rolling difficult-to-deform materials such as high-grade silicon steel and medium-to-high carbon high-strength steel due to its high rigidity and large reduction capacity. Its side support rolls (referred to as side rolls) are used to withstand the horizontal force generated by the work rolls during the rolling process, preventing the work rolls from bending horizontally, and are key components to ensure plate shape and rolling stability.

[0003] In actual production, when rolling thick (≥6.0mm) high-grade medium-high carbon steel (such as 80CrV2), the rolling force, tension and friction state change drastically at the moment of start-up. The force on the side rolls increases instantaneously, exceeding the force safety threshold set by the system, causing the side roll drive device to alarm and trigger the "stop" protection.

[0004] Existing maintenance methods can only alleviate this by periodically calibrating the side roll positions and zero-force points, which cannot cope with the dynamic load changes during startup. This forces operators to reduce the load per pass by increasing the number of rolling passes, which seriously affects production efficiency and increases energy and roll consumption. Summary of the Invention

[0005] This application provides a start-up control method, device, equipment, medium, and product for a multi-roll mill, which can offset the instantaneous peak force on the side rolls and avoid overload tripping faults.

[0006] In a first aspect, embodiments of this application provide a start-up control method for a multi-roll mill, the method comprising: During the startup process of the multi-roll mill according to multiple preset stages, the side rolls of the multi-roll mill are controlled to be loaded according to the force setting value corresponding to each stage. The loading speed of the multi-roll mill and the force setting value of the side rolls of the multi-roll mill are different in different stages. The force setting value of the side rolls changes synchronously with the rolling force of the work rolls of the multi-roll mill. Obtain the force measurement value of the side roller; If the measured force value is greater than a preset safety threshold, the loading speed of the multi-roll mill and the rolling force of the work roll are kept constant, and the force setting value of the side roll is reduced by a preset value.

[0007] Secondly, embodiments of this application provide a start-up control device for a multi-roll mill, the device comprising: The first control module is used to control the side rolls of the multi-roll mill to be loaded according to the force setting value corresponding to each stage during the start-up process of the multi-roll mill according to multiple preset stages. The loading speed of the multi-roll mill and the force setting value of the side rolls of the multi-roll mill are different in different stages. The force setting value of the side rolls changes synchronously with the rolling force of the work rolls of the multi-roll mill. The first acquisition module is used to acquire the force measurement value of the side roller; The second control module is used to control the loading speed of the multi-roll mill and the rolling force of the work roll to remain unchanged, and to reduce the force setting value of the side roll by a preset value when the measured force value is greater than a preset safety threshold.

[0008] Thirdly, embodiments of this application provide an electronic device, the device including: a processor and a memory storing computer program instructions; the processor, when executing the computer program instructions, implements the start-up control method for a multi-roll mill as described above.

[0009] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implement the start-up control method for a multi-roll mill as described above.

[0010] Fifthly, embodiments of this application provide a computer program product in which instructions, when executed by a processor of an electronic device, cause the electronic device to perform the start-up control method for a multi-roll mill as described in any of the preceding claims.

[0011] The multi-roll mill start-up control method, device, equipment, medium, and product of this application embodiment can dynamically adapt the side roll force parameters to the working condition changes of each start-up stage of the mill by multi-stage differentiated matching of the mill loading speed and side roll force setting value, and synchronously linking and controlling it with the rolling force. This effectively suppresses sudden changes in rolling load and lateral force during the start-up stage and weakens dynamic impact. On this basis, by real-time monitoring of the side roll force state, when the force is close to the safety threshold, the mill loading speed and rolling force are kept constant, and the side roll force setting value is dynamically reduced only. Without changing the original rolling process or reducing the single-pass reduction load, the instantaneous peak force of the side roll is accurately offset, avoiding load over-limit tripping faults, and achieving dual protection of rolling stability and rolling efficiency. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic flowchart of a start-up control method for a multi-roll mill provided in an embodiment of this application; Figure 2 This is a structural block diagram of the system hardware provided in the embodiments of this application; Figure 3 This is a schematic flowchart of another multi-roll mill start-up control method provided in an embodiment of this application; Figure 4 This is a schematic diagram of the curve showing the change of the set value of the side support roll force during the mill start-up process over time, provided in an embodiment of this application. Figure 5 This is a schematic diagram of the start-up control device for a multi-roll mill provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0014] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0015] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0016] The 18-roll mill is widely used for rolling difficult-to-deform materials such as high-grade silicon steel and medium-to-high carbon high-strength steel due to its high rigidity and large reduction capacity. Its side support rolls (referred to as side rolls) are used to withstand the horizontal force generated by the work rolls during the rolling process, preventing the work rolls from bending horizontally, and are key components to ensure plate shape and rolling stability.

[0017] In actual production, when rolling thick (≥6.0mm) high-grade medium-high carbon steel (such as 80CrV2), the rolling force, tension and friction state change drastically at the moment of start-up. The force on the side rolls increases instantaneously, exceeding the force safety threshold set by the system, causing the side roll drive device to alarm and trigger the "stop" protection.

[0018] Existing maintenance methods can only alleviate this by periodically calibrating the side roll positions and zero-force points, which cannot cope with the dynamic load changes during startup. This forces operators to reduce the load per pass by increasing the number of rolling passes, which seriously affects production efficiency and increases energy and roll consumption.

[0019] The acquisition, storage, use, and processing of data in this application comply with relevant national laws and regulations. It should be noted that certain software, components, models, and other existing industry solutions may be mentioned in the embodiments of this application. 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.

[0020] To address the problems of the prior art, embodiments of this application provide a start-up control method, apparatus, equipment, medium, and product for a multi-roll mill. The start-up control method for a multi-roll mill provided in this application embodiment will be described first below.

[0021] Figure 1 A schematic flowchart of a start-up control method for a multi-roll mill according to an embodiment of this application is shown. Figure 1 As shown, a start-up control method for a multi-roll mill may include the following steps S101 to S103: S101. During the startup process of the multi-roll mill according to multiple preset stages, the side rolls of the multi-roll mill are controlled to be loaded according to the force setting value corresponding to each stage. The loading speed of the multi-roll mill and the force setting value of the side rolls of the multi-roll mill are different in different stages. The force setting value of the side rolls changes synchronously with the rolling force of the work rolls of the multi-roll mill. S102. Obtain the force measurement value of the side roller; S103. When the measured force value is greater than the preset safety threshold, the loading speed of the multi-roll mill and the rolling force of the work roll are kept constant, and the set value of the side roll force is reduced by a preset value.

[0022] The multi-roll mill start-up control method of this application embodiment can dynamically adapt the side roll force parameters to the working condition changes of each start-up stage by differentiating the mill loading speed and side roll force setting value in multiple stages and synchronously controlling them with the rolling force. This effectively suppresses sudden changes in rolling load and lateral force during the start-up stage and weakens dynamic impact. On this basis, by monitoring the side roll force status in real time, the mill loading speed and rolling force are kept constant when the force is close to the safety threshold, and the side roll force setting value is dynamically reduced only. Without changing the original rolling process or reducing the single-pass reduction load, the instantaneous peak force of the side roll is accurately offset, avoiding load over-limit tripping faults and achieving dual protection of rolling stability and rolling efficiency.

[0023] In S101, the aforementioned multi-roll mill can be a cold rolling mill base with a pair of work rolls arranged inside the mill stand, and multiple layers of intermediate rolls and side rolls arranged outside the work rolls to form a tower-shaped support roll system, with a total number of rolls greater than 4. In the embodiments of this application, the multi-roll mill may include work rolls and side rolls. Exemplarily, the aforementioned multi-roll mill may be an 18-roll mill.

[0024] The aforementioned stages may include a first stage, a second stage, and a third stage, wherein the loading speed of the multi-roll mill and the force setting value of the side rolls of the multi-roll mill are different in different stages.

[0025] The force setting value of the aforementioned side rolls changes synchronously with the rolling force of the work rolls of the multi-roll mill.

[0026] In some embodiments of this application, during the startup of a multi-roll mill according to multiple preset stages, the side rolls of the multi-roll mill are controlled to be loaded according to the force setting values ​​corresponding to each stage. For example, during the startup of the multi-roll mill according to a preset first stage, the side rolls of the multi-roll mill are controlled to be loaded according to the force setting values ​​corresponding to the first stage. The loading speed of the first stage increases from zero to a preset first speed, and the force setting value corresponding to the first stage increases linearly to a preset first working force according to a preset first slope. During the operation of the multi-roll mill according to a preset second stage, the side rolls are controlled to be loaded according to the force setting values ​​corresponding to the second stage. The loading speed of the second stage increases from the first speed to a preset second speed, and the force setting value corresponding to the second stage increases linearly to a preset second working force according to a preset second slope. The second working force is greater than the first working force, and the rate of change of the force setting value matches the rate of change of the rolling force of the work roll. During the operation of the multi-roll mill according to a preset third stage, the side rolls are controlled to be loaded according to the force setting values ​​corresponding to the third stage. The loading speed of the third stage is greater than the second speed, and the force setting value corresponding to the third stage switches to a preset force target value.

[0027] In S102, in some embodiments of this application, the force measurement value of the side roller is obtained. For example, the force measurement value of the side roller fed back by the side roller pressure sensor can be collected in real time during each control cycle.

[0028] In S103, the aforementioned safety threshold, exemplarily, can be 120% of the rated force. Of course, in this embodiment, the safety threshold is not limited to this and can be set according to the user's actual needs, which is not specifically limited here.

[0029] The aforementioned preset value, for example, can be 10%. Of course, in this embodiment, the preset value is not limited to this and can be set according to the user's actual needs, which is not specifically limited here.

[0030] In some embodiments of this application, the above method may further include: controlling the multi-roll mill to roll normally and stably when the force measurement value is less than or equal to a safety threshold.

[0031] As one implementation of this application, in order to eliminate mechanical backlash and avoid instantaneous shock during startup, the method may further include the following before step S101: The side rolls are controlled to press against the work rolls with a preset preload so that the side rolls and work rolls establish contact before the multi-roll mill starts.

[0032] The aforementioned preload force, exemplarily, can be 10% to 20% of the rated working force. In the embodiments of this application, the preload force is not limited to this and can also be set according to the actual needs of the user, which is not specifically limited here.

[0033] In this embodiment of the application, before the multi-roll mill is started, the side support roll is pre-pressed against the roll body of the work roll by the side roll drive hydraulic cylinder, so that the side roll and the work roll establish a stable contact before the start-up, which can eliminate mechanical gaps and avoid impact at the moment of start-up.

[0034] In some embodiments, the aforementioned preload is associated with the strip thickness, width, and material of the current pass of the multi-roll mill.

[0035] For example, when the strip thickness, width and material of the current pass are thick-gauge medium-high carbon steel, 15% to 20% of the rated working force can be used preferentially.

[0036] In this embodiment, the preload of the side rolls is matched according to the thickness, width, and material of the strip in the current pass, which can match the expected lateral force under different working conditions: a higher preload is used for thicker, wider, and higher-hardness steel, which can effectively eliminate the gap between the rolls and ensure that the side rolls and work rolls are in close contact throughout the start-up process, eliminating the additional impact load caused by gap collisions; a lower preload is used for thinner, narrower, and softer steel, reducing the basic load caused by static preload. Overall, it can suppress the instantaneous peak force on the side rolls during the start-up stage, reduce the probability of side roll overload and stoppage, and stabilize the strip shape control accuracy during the rolling process.

[0037] In some embodiments, the aforementioned multiple stages may include a first stage, a second stage, and a third stage, and S101 may specifically include: During the startup process of the multi-roll mill according to the preset first stage, the side rolls of the multi-roll mill are controlled to be loaded according to the force setting value corresponding to the first stage. The loading speed of the first stage increases from zero to the preset first speed, and the force setting value corresponding to the first stage increases linearly to the preset first working force according to the preset first slope. During the operation of the multi-roll mill in the preset second stage, the control side rolls are loaded according to the force setting value corresponding to the second stage. The loading speed of the second stage increases from the first speed to the preset second speed. The force setting value corresponding to the second stage increases linearly to the preset second working force according to the preset second slope. The second working force is greater than the first working force. The rate of change of the force setting value matches the rate of change of the rolling force of the working roll. During the operation of the multi-roll mill in the preset third stage, the control side rolls are loaded according to the force setting value corresponding to the third stage. The loading speed in the third stage is greater than the second speed, and the force setting value corresponding to the third stage is switched to the preset force target value.

[0038] The loading speed in the first stage mentioned above can be increased from zero to a preset first speed. The first speed, for example, can be the strip threading speed. The strip threading speed is the low-speed, constant speed at which the strip runs during the strip threading stage of the rolling mill; it is an independent process speed setting distinct from the normal rolling speed and the tail-end speed.

[0039] The force setting value corresponding to the first stage mentioned above can be linearly increased to a preset first working force according to a preset first slope. Herein, the first working force can be, for example, 40% of the rated working force.

[0040] The loading speed in the second stage can be increased from the first speed to a preset second speed. The second speed can be 30% of the rolling mill's operating speed.

[0041] The force setting value corresponding to the second stage described above can linearly increase to a preset second working force according to a preset second slope. The second working force is greater than the first working force; for example, the second working force can be 80% of the rated working force. The second slope can be the same as or different from the first slope described above.

[0042] The loading speed in the third stage is greater than that in the second stage, and the corresponding force setting value for the third stage is switched to the preset force target value. This force target value can be calculated by a preset process model based on the strip width, thickness, material, rolling force, and strip shape requirements.

[0043] In this embodiment, the linear variation law of the mill speed-up process and the side roll force setting value is matched in three stages. In the first stage, the speed is gradually increased from zero to the first speed, and the side roll force is slowly increased at a fixed slope, which can gradually eliminate the mechanical gap of the roll system and avoid the additional impact caused by the start-up gap impact. In the second stage, the speed is further increased to the second speed, and the side roll force is synchronously increased to a larger second working force with a slope that adapts to the rolling force change rate, so as to realize the lateral support load synchronously compensates with the rolling load and prevents the support force from lagging and forming a force peak. In the third stage, the mill operating speed is increased and the side roll force is switched to the steady-state target value, so that the rolling condition enters the stable support range. The mill speed, rolling force and side roll force are controlled by slope coordination throughout the process, and the sudden change of lateral load during the start-up process is buffered step by step, which effectively reduces the instantaneous peak force of the side roll, avoids the side roll load exceeding the limit and stopping, and improves the continuity and stability of rolling thick high-strength steel.

[0044] As another implementation of this application, in order to stabilize the rolling conditions and achieve closed-loop adjustment of the side roll force, after S102 above, the method may further include: The force setting value for the current stage is adjusted based on the comparison results, which are obtained by comparing the measured force value with the force setting value for the current stage.

[0045] The above comparison results can be obtained by comparing the force measurement value with the force setting value of the current stage, and can be used to indicate the deviation between the force measurement value and the force setting value of the current stage.

[0046] In some embodiments of this application, the force setting value for the current stage is adjusted based on the comparison result. For example, the force setting value of the side roller hydraulic cylinder pressure for the current stage can be adjusted by a servo valve based on the comparison result.

[0047] In this embodiment, by comparing the measured force value of the side roll with the current stage force setting value in real time and dynamically correcting the corresponding stage force setting value based on the comparison result, the deviation between the actual load and the set load of the side roll can be corrected in real time in a closed loop. This can promptly offset the lateral force increment caused by the fluctuation of the rolling conditions, continuously suppress the instantaneous peak value of the side roll force, avoid the side roll load exceeding the limit and stopping, and ensure that the side roll support force in each start-up stage is always adapted to the real-time rolling conditions, thus stabilizing the entire rolling process.

[0048] In some embodiments, adjusting the force setting value for the current stage based on the comparison result may include: If the measured force value is greater than the preset safety threshold, the force setting value for the current stage will be adjusted based on the comparison results after the preset target time period.

[0049] The aforementioned preset target time period, for example, can be a 0.5-second time period. Of course, in this embodiment, the target time period is not limited to this and can be set according to the user's actual needs, which is not specifically limited here.

[0050] In this embodiment, after the measured value of the side roll force exceeds the safety threshold, the force setting value is adjusted after a preset target time period. This can temporarily maintain the original support parameters of the current stage, avoid frequent and unnecessary parameter corrections triggered by instantaneous small load fluctuations, and prevent frequent fluctuations in the side roll force from aggravating the impact. At the same time, the adjustment is performed after the load state stabilizes, making the correction action more precise. This can smoothly reduce the peak value of the lateral load that continuously exceeds the threshold, avoid the side roll from over-limiting and stopping, and ensure a smooth transition of rolling conditions at each stage.

[0051] As another implementation of this application, in order to further avoid over-limit shutdowns caused by drastic fluctuations in rolling load during the start-up phase, the above method may further include: Obtain the rate of change of rolling force on the work roll; If the rate of change of rolling force exceeds the preset rate of change threshold, the force setting value of the side roll is compensated and corrected according to the rate of change of rolling force and the rate of change threshold.

[0052] In some embodiments of this application, the rate of change of the rolling force of the work roll is obtained, exemplarily, by collecting the rolling force of the work roll at a fixed control period T, and calculating the actual rate of change, i.e., the rate of change of the rolling force, according to the following formula: ΔP_rate=|P_actual(n) P_actual( 1)| / T Where: ΔP_rate is the actual rate of change of rolling force (kN / ms); P_actual(n) is the rolling force in the current control cycle; P_actual( 1) is the rolling force of the previous control cycle; T is the control cycle, for example, fixed at 10ms.

[0053] The aforementioned preset rate of change threshold, i.e. the rolling force rate of change setting threshold, can be represented by ΔP_rate_set. For example, the on-site setting range is 5–10 kN / ms.

[0054] In some embodiments of this application, the force setting value of the side roll is compensated and corrected based on the rolling force change rate and the change rate threshold. For example, the force setting value of the side roll can be compensated and corrected according to the following formula based on the rolling force change rate and the change rate threshold, as shown below: F_set_new = F_set_original + K × (ΔP_rat) ΔP_rate_set) In the formula: F_new is the corrected set value of the side roller force; F_original is the original set value of the side roller force before compensation; K is the correction coefficient, which can take values ​​of 0.1–0.3; ΔP_rat ΔP_rate_set represents the deviation of the rolling force change rate.

[0055] In this embodiment, by acquiring the rate of change of the rolling force of the work roll in real time, and dynamically compensating and correcting the set value of the side roll force according to the actual rate of change when the rolling force changes drastically and exceeds the preset rate of change threshold, the lateral support force of the side roll can be matched with the sudden change trend of the rolling force in advance and synchronously. This compensates for the lag of simply following the stage set value control, effectively offsets the instantaneous lateral impact load generated by the rapid fluctuation of the rolling force, suppresses the abnormal peak value of the side roll force, and further avoids the phenomenon of over-limit tripping caused by the drastic fluctuation of the rolling load during the start-up stage. This significantly improves the dynamic matching accuracy and rolling stability of the roll system support state in each start-up stage of the mill.

[0056] As another implementation of this application, in order to avoid permanent damage to equipment, reduce downtime maintenance costs, and ensure the long-term operational safety of the unit, the above method may further include: If the set value of the side roll force is reduced repeatedly and the measured value of the force exceeds the safety threshold, the multi-roll mill will be stopped and a prompt message will be generated to remind the user of the abnormal force on the side roll and to check the target component.

[0057] The above prompts can be used to alert users to abnormal stress on the side rollers and to check the target components. The target components can be the roller surface condition and / or the side roller drive system.

[0058] In some embodiments of this application, if the force setting value of the side roll is reduced multiple times consecutively and the measured force value exceeds a safety threshold, the multi-roll mill is controlled to stop and a prompt message is generated. For example, the multi-roll mill may be controlled to stop and a prompt message generated after the force setting value of the side roll is reduced three times consecutively and the measured force value exceeds the safety threshold. In the embodiments of this application, "multiple times consecutively" is not limited to the three times mentioned above; it can be other numbers, which can be set according to the user's actual needs and are not specifically limited here.

[0059] In this embodiment, when the side roll force setting value cannot be controlled within the safe threshold after repeated adjustments, the mill is promptly shut down and an abnormality alert is sent. This can promptly interrupt the continuous overload operation state and prevent fatigue damage caused by long-term overload on components such as side rolls, hydraulic cylinders, and backing bearings. At the same time, it prompts operators to inspect related components, which can quickly locate the root cause of the fault, avoid permanent equipment damage, reduce downtime maintenance costs, and ensure the long-term operational safety of the unit.

[0060] To facilitate understanding of the start-up control method for the multi-roll mill in the embodiments of this application, the actual application process of this start-up control method for the multi-roll mill is described as follows: The system hardware adapted to the embodiments of this application will be described below. Figure 2 A structural block diagram of the system hardware adapted to the embodiments of this application is shown. The system hardware may include a Human Machine Interface (HMI) operator station, a Programmable Logic Controller (PLC), a rolling force sensor, a speed encoder, a side roll pressure sensor, a side roll hydraulic cylinder servo valve, and a side roll drive hydraulic cylinder. Each hardware unit works collaboratively through signal acquisition and command output to achieve real-time closed-loop adjustment and abnormal protection control of the side roll force.

[0061] Figure 3 A schematic flowchart of another multi-roll mill start-up control method provided in an embodiment of this application is shown. Figure 3 As shown, a start-up control method for a multi-roll mill is applied to the aforementioned basic automation controller. The method may include the following steps: Step S301: Before starting the machine, control the pre-tightening of the side rollers. The pre-tightening force is 10% to 20% of the rated working force.

[0062] Step S302, Start-up process segmented loading control: Low-speed tension building stage control, force increased to 40% of rated; Accelerated rolling stage control, force increased to 80% of rated; Stable rolling stage control, switching the process model target value.

[0063] Step S303: Dynamic closed-loop adjustment of force, pressure closed-loop and feedforward compensation.

[0064] Step S304: Check if the force on the side roll exceeds the limit (>120% of the rated force); if so, perform adaptive protection for abnormal conditions; otherwise, roll normally and stably.

[0065] This application provides another start-up control method for a multi-roll mill, the process of which is executed sequentially: pre-start side roll pre-tensioning control, low-speed tension building stage control, accelerated rolling stage control, stable rolling stage model control, dynamic closed-loop force adjustment, and adaptive protection for abnormal states; when the side roll force is detected to exceed the safety threshold, the system executes adaptive protection logic, and if the limit is exceeded three times consecutively, a safety shutdown and alarm are triggered. In this way, by pre-starting pre-tensioning, segmented loading during start-up, and dynamic closed-loop force adjustment, a smooth transition of side roll force can be achieved, avoiding shutdowns caused by sudden force changes, ensuring stable rolling stability and production efficiency of thick, high-grade, medium-high carbon steel, and reducing manual maintenance.

[0066] The following details the specific steps outlined above.

[0067] In step S301, before the mill starts, based on the strip thickness, width, material, and rolling force setting for the current pass, the side support roll is pre-pressed against the work roll body via the side roll drive hydraulic cylinder. The initial preload is set to 10%–20% of the rated working force, ensuring stable contact between the side roll and the work roll before start-up, eliminating mechanical clearance, and preventing impact at startup. The initial preload is automatically selected based on the strip thickness and material; for thicker strips with high carbon content, 15%–20% of the rated working force is preferentially used.

[0068] In step S302, the three-stage segment ratios and speed nodes are not set based on conventional experience, but rather are a dedicated control strategy determined through extensive field tests and mechanical analysis, based on the horizontal force transmission characteristics of the work rolls, tension establishment patterns, rolling load rise curves, and side roll mechanical response characteristics of the 18-roll mill. The aim is to achieve a smooth transition of force on the side rolls and avoid impact-induced shutdowns. The start-up process is divided into three stages, and the specific basis for the ratios and nodes of each stage is as follows: 1) Low-speed tension building stage (speed 0 → threading speed): In this stage, the strip steel completes the bite and the tension is built up from zero. The horizontal reaction force of the work roll is only 30%–45% of the steady-state value. The force value of the side roll rises linearly to 40% of the rated working force according to the preset slope. 40% of the rated force can completely eliminate mechanical clearance and suppress the initial horizontal deflection of the work roll. At the same time, it avoids the formation of reverse top roll due to excessive pre-tension. S303 continuously tracks and adjusts in a closed loop. The rising time is synchronized with the tension building time. That is, the force rising slope and the tension building rate are dynamically matched to ensure that the force and tension are built up synchronously.

[0069] 2) Accelerated rolling stage (threading speed → 30% of working speed): During this stage, the rolling load rises rapidly, and the rolling force has reached 75%–85% of the steady-state value. The horizontal force of the work roll is close to the steady state. The force on the side roll continues to rise linearly to 80% of the rated working force. 80% of the rated force is the impact buffer safety threshold, which is the highest pre-control limit before the process model is put into use. This can avoid overshoot and sudden force changes caused by directly loading to 100%, ensuring a smooth transition. The S303 closed loop is uninterrupted, and the pressure matching new setting value is corrected in real time. The rising rate is dynamically matched according to the actual rising rate of the work roll rolling force.

[0070] 3) Stable rolling stage (speed > 30% of working speed): The rolling state tends to be stable in this stage, and the AGC system and tension closed loop are fully engaged. The side roll force needs to be switched to the target value calculated by the process model according to the strip width, thickness, material, rolling force, and strip shape requirements. The process model can achieve the optimal matching between the side roll force and the rolling conditions, taking into account both strip shape quality and roll system protection. S303 continues to operate in closed loop.

[0071] like Figure 4 The figure shows a curve illustrating the change in the setpoint force of the side support rolls during the mill start-up process over time. The horizontal axis represents time, and the vertical axis represents the percentage of the setpoint force on the side rolls relative to the rated working force. The curve is divided into three control sections: in the low-speed tension building stage, the side roll force linearly increases from 10%–20% of the initial preload to 40% of the rated working force; in the accelerated rolling stage, the side roll force linearly increases from 40% to 80% of the rated working force; and in the stable rolling stage, the side roll force switches to the value calculated by the process model, entering a stable control state.

[0072] The rolling force and side roll pressure are collected synchronously throughout the three stages mentioned above for feedforward compensation. If the force exceeds the standard in any stage, step S304 adaptive protection will be triggered.

[0073] In step S303, within each control cycle, the measured value fed back by the pressure sensor of the side roller hydraulic cylinder is collected in real time, compared with the current stage set value, and the hydraulic cylinder pressure is adjusted by the servo valve (equivalent to giving a compensation value) to form a closed-loop control.

[0074] Simultaneously, feedforward compensation for the rolling force change rate is introduced: when the actual rolling force change rate is detected to exceed a set threshold, the side roll force setting value is corrected in real time by detecting the deviation between the actual rolling force change rate and the set threshold, with a correction coefficient of 0.1 to 0.3, to suppress impact. The specific feedforward compensation process is as follows: (a) Triggering conditions The rolling force is collected over a fixed control period T, and the actual rate of change is calculated: ΔP_rate=|P_actual(n) P_actual( 1)| / T Where: ΔP_rate is the actual rate of change of rolling force (kN / ms); P_actual(n) is the rolling force in the current control cycle; P_actual( 1) is the rolling force of the previous control cycle; T is the control cycle, for example, fixed at 10ms.

[0075] Feedforward compensation is activated when the set threshold is exceeded, i.e., when ΔP_rate > ΔP_rate_set, where ΔP_rate_set is the set threshold for the rate of change of rolling force (e.g., set on-site: 5–10 kN / ms).

[0076] (ii) Feedforward Compensation Correction Formula F_set_new = F_set_original + K × (ΔP_rat) ΔP_rate_set) In the formula: F_new setting is the corrected side roller force setting value; F_original setting is the original side roller force setting value before compensation; K is the correction coefficient, with a value of 0.1–0.3; ΔP_rat ΔP_rate_set represents the deviation of the rolling force change rate.

[0077] It should be noted that the S302 segmented loading control switches the force setting value of the side rollers segment by segment. The S303 dynamic closed-loop adjustment is a continuous pressure feedback adjustment algorithm. These two are parallel processes, not sequentially executed segment by segment.

[0078] In this embodiment, the horizontal force impact of the work roll is predicted in advance by the rolling force change rate, which can correct the side roll force setting value in advance, suppress sudden force changes and overshoot, make up for the lag of pure closed-loop regulation, and realize rapid and stable control of the side roll force.

[0079] In step S304, if the measured value of the side roll force still exceeds the safety threshold (e.g., 120% of the rated force) during the start-up process, the system automatically triggers the following logic: pause the speed increase and maintain the current rolling force; reduce the current side roll force setting value by 10%; re-execute the closed-loop adjustment after a delay of 0.5 seconds; if the limit is exceeded continuously, the adjustment will be converged step by step to avoid accidental shutdown; if the limit is still exceeded after three consecutive adjustments, it is determined that the roll surface, hydraulic cylinder or mechanical system is abnormal, and the machine will be safely shut down and the message "The side roll force is abnormal, it is recommended to check the roll surface condition or the side roll drive system" will be displayed.

[0080] In the embodiments of this application, the start-up impact can be eliminated, significantly reducing the probability of side roll tripping; the rolling capacity of thick high-carbon steel can be improved, the number of rolling passes can be reduced, and the production efficiency can be increased by more than 15%; manual calibration operations can be reduced, and maintenance intensity can be reduced; the life of side roll bearings, hydraulic cylinders and sensors can be extended, and the equipment reliability can be improved.

[0081] Based on the multi-roll mill start-up control method provided in the above embodiments, this application also provides a specific implementation of a multi-roll mill start-up control device. Please refer to the following embodiments.

[0082] like Figure 5 As shown, the multi-roll mill start-up control device 500 provided in this application embodiment may include the following modules: a first control module 501, a first acquisition module 502, and a second control module 503.

[0083] The first control module 501 is used to control the side rolls of the multi-roll mill to be loaded according to the force setting value corresponding to each stage during the start-up process of the multi-roll mill according to multiple preset stages. The loading speed of the multi-roll mill and the force setting value of the side rolls of the multi-roll mill are different in different stages. The force setting value of the side rolls changes synchronously with the rolling force of the work rolls of the multi-roll mill. The first acquisition module 502 is used to acquire the force measurement value of the side roller; The second control module 503 is used to control the loading speed of the multi-roll mill and the rolling force of the work rolls to remain unchanged when the measured force value is greater than the preset safety threshold, and to reduce the set value of the side roll force by a preset value.

[0084] The start-up control device for the multi-roll mill in this application embodiment can dynamically adapt the side roll force parameters to the working condition changes at each start-up stage of the mill by multi-stage differential matching of the mill loading speed and the side roll force setting value, and synchronously link and control them with the rolling force. This effectively suppresses sudden changes in rolling load and lateral force during the start-up stage and weakens dynamic impact. On this basis, by monitoring the side roll force status in real time, the mill loading speed and rolling force are kept constant when the force is close to the safety threshold, and the side roll force setting value is dynamically reduced only. Without changing the original rolling process or reducing the single-pass reduction load, the device can accurately offset the instantaneous peak force of the side roll, avoid overload tripping faults, and achieve dual protection of rolling stability and rolling efficiency.

[0085] As one implementation of this application, in order to eliminate mechanical clearance and avoid instantaneous impact during startup, the aforementioned device 500 may further include: The third control module is used to control the side rolls to press against the work rolls with a preset preload, so that the side rolls and work rolls can establish contact before the multi-roll mill starts.

[0086] In some embodiments, the aforementioned preload is associated with the strip thickness, width, and material of the current pass of the multi-roll mill.

[0087] In some embodiments, the aforementioned multiple stages may include a first stage, a second stage, and a third stage, and the aforementioned first control module 501 may specifically include: The first control unit is used to control the side rolls of the multi-roll mill to be loaded according to the force setting value corresponding to the first stage during the start-up process of the multi-roll mill according to the preset first stage. The loading speed of the first stage increases from zero to the preset first speed, and the force setting value corresponding to the first stage increases linearly to the preset first working force according to the preset first slope. The second control unit is used to control the side rolls to be loaded according to the force setting value corresponding to the second stage during the operation of the multi-roll mill in the preset second stage. The loading speed of the second stage increases from the first speed to the preset second speed. The force setting value corresponding to the second stage increases linearly to the preset second working force according to the preset second slope. The second working force is greater than the first working force. The rate of change of the force setting value matches the rate of change of the rolling force of the working roll. The third control unit is used to control the side rolls to be loaded according to the force setting value corresponding to the third stage during the operation of the multi-roll mill in the preset third stage. The loading speed of the third stage is greater than the second speed, and the force setting value corresponding to the third stage is switched to the preset force target value.

[0088] As another implementation of this application, in order to stabilize the rolling conditions and achieve closed-loop adjustment of the side roll force, the above-mentioned device 500 may further include: The adjustment module is used to adjust the force setting value of the current stage based on the comparison result, which is obtained by comparing the force measurement value with the force setting value of the current stage.

[0089] In some embodiments, the adjustment module described above can be used to adjust the force setting value of the current stage based on the comparison result after a preset target time period when the force measurement value is greater than a preset safety threshold.

[0090] As another implementation of this application, in order to further avoid over-limit shutdown caused by drastic fluctuations in rolling load during the start-up phase, the aforementioned device 500 may further include: The second acquisition module is used to acquire the rate of change of the rolling force of the work roll; The correction module is used to compensate and correct the force setting value of the side rolls based on the rolling force change rate and the change rate threshold when the rolling force change rate exceeds the preset change rate threshold.

[0091] As another implementation of this application, in order to avoid permanent damage to equipment, reduce downtime maintenance costs, and ensure the long-term operational safety of the unit, the aforementioned device 500 may further include: The fourth control module is used to control the multi-roll mill to stop when the set value of the side roll is reduced repeatedly and the measured value of the force is greater than the safety threshold. The module also generates a prompt message to remind the user of the abnormal force on the side roll and to check the target component.

[0092] Figure 6 A schematic diagram of the hardware structure of the electronic device provided in an embodiment of this application is shown.

[0093] An electronic device may include a processor 601 and a memory 602 storing computer program instructions.

[0094] Specifically, the processor 601 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0095] Memory 602 may include mass storage for data or instructions. For example, and not limitingly, memory 602 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 602 may include removable or non-removable (or fixed) media. Where appropriate, memory 602 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 602 is non-volatile solid-state memory.

[0096] In a particular embodiment, memory 602 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Thus, generally, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to one aspect of this disclosure.

[0097] The processor 601 reads and executes computer program instructions stored in the memory 602 to implement any of the multi-roll mill start-up control methods in the above embodiments.

[0098] In one example, the electronic device may also include a communication interface 603 and a bus 610. For example, Figure 6As shown, the processor 601, memory 602, and communication interface 603 are connected through bus 610 and complete communication with each other.

[0099] The communication interface 603 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0100] Bus 610 includes hardware, software, or both, that couples components of an electronic device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 610 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, this application contemplates any suitable bus or interconnect.

[0101] This electronic device can execute the start-up control method for the multi-roll mill as described in the embodiments of this application, thereby achieving a combination of Figure 1 and Figure 5 The method and apparatus for starting up a multi-roll mill are described.

[0102] Furthermore, in conjunction with the multi-roll mill start-up control method in the above embodiments, this application embodiment can provide a computer-readable storage medium for implementation. This computer-readable storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the multi-roll mill start-up control methods in the above embodiments.

[0103] This application also provides a computer program product, including a computer program that, when executed by a processor, implements any of the multi-roll mill start-up control methods described in the above embodiments.

[0104] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0105] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0106] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0107] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block in 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, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0108] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A start-up control method for a multi-roll mill, characterized in that, include: During the startup process of the multi-roll mill according to multiple preset stages, the side rolls of the multi-roll mill are controlled to be loaded according to the force setting value corresponding to each stage. The loading speed of the multi-roll mill and the force setting value of the side rolls of the multi-roll mill are different in different stages. The force setting value of the side rolls changes synchronously with the rolling force of the work rolls of the multi-roll mill. Obtain the force measurement value of the side roller; If the measured force value is greater than a preset safety threshold, the loading speed of the multi-roll mill and the rolling force of the work roll are kept constant, and the force setting value of the side roll is reduced by a preset value.

2. The start-up control method for a multi-roll mill according to claim 1, characterized in that, Before controlling the side rolls of the multi-roll mill to be loaded according to the force setting values ​​corresponding to each stage during the startup process of the multi-roll mill according to preset multiple stages, the method further includes: The side roll is controlled to press against the work roll with a preset preload so that the side roll and the work roll establish contact before the multi-roll mill starts.

3. The start-up control method for a multi-roll mill according to claim 2, characterized in that, The preload force is related to the strip thickness, width, and material of the current pass of the multi-roll mill.

4. The start-up control method for a multi-roll mill according to claim 1, characterized in that, The multiple stages include a first stage, a second stage, and a third stage. During the startup process of the multi-roll mill according to the preset multiple stages, controlling the side rolls of the multi-roll mill to be loaded according to the force setting values ​​corresponding to each stage includes: During the startup process of the multi-roll mill according to the preset first stage, the side rolls of the multi-roll mill are controlled to be loaded according to the force setting value corresponding to the first stage. The loading speed of the first stage increases from zero to the preset first speed, and the force setting value corresponding to the first stage increases linearly to the preset first working force according to the preset first slope. During the operation of the multi-roll mill in the preset second stage, the side rolls are controlled to be loaded according to the force setting value corresponding to the second stage. The loading speed of the second stage increases from the first speed to the preset second speed. The force setting value corresponding to the second stage increases linearly to the preset second working force according to the preset second slope. The second working force is greater than the first working force. The rate of change of the force setting value matches the rate of change of the rolling force of the working roll. During the operation of the multi-roll mill in the preset third stage, the side rolls are controlled to be loaded according to the force setting value corresponding to the third stage. The loading speed of the third stage is greater than the second speed, and the force setting value corresponding to the third stage is switched to the preset force target value.

5. The start-up control method for a multi-roll mill according to claim 1, characterized in that, After obtaining the force measurement value of the side roller, the method further includes: The force setting value for the current stage is adjusted based on the comparison result, which is obtained by comparing the force measurement value with the force setting value for the current stage.

6. The start-up control method for a multi-roll mill according to claim 5, characterized in that, The adjustment of the force setting value for the current stage based on the comparison results includes: If the measured force value is greater than the preset safety threshold, the force setting value for the current stage is adjusted based on the comparison results after the preset target time period.

7. The start-up control method for a multi-roll mill according to claim 1, characterized in that, The method further includes: Obtain the rate of change of the rolling force of the work roll; If the rate of change of the rolling force is greater than a preset rate of change threshold, the force setting value of the side roll is compensated and corrected according to the rate of change of the rolling force and the rate of change threshold.

8. The start-up control method for a multi-roll mill according to claim 1, characterized in that, The method further includes: If the set value of the force on the side roll is reduced repeatedly and the measured value of the force is greater than the safety threshold, the multi-roll mill is stopped and a prompt message is generated. The prompt message is used to remind the user that the force on the side roll is abnormal and to check the target component.

9. A start-up control device for a multi-roll rolling mill, characterized in that, The device includes: The first control module is used to control the side rolls of the multi-roll mill to be loaded according to the force setting value corresponding to each stage during the start-up process of the multi-roll mill according to multiple preset stages. The loading speed of the multi-roll mill and the force setting value of the side rolls of the multi-roll mill are different in different stages. The force setting value of the side rolls changes synchronously with the rolling force of the work rolls of the multi-roll mill. The first acquisition module is used to acquire the force measurement value of the side roller; The second control module is used to control the loading speed of the multi-roll mill and the rolling force of the work roll to remain unchanged, and to reduce the force setting value of the side roll by a preset value when the measured force value is greater than a preset safety threshold.

10. An electronic device, characterized in that, The device includes: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, it implements the start-up control method for a multi-roll mill as described in any one of claims 1-8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the start-up control method for a multi-roll mill as described in any one of claims 1-8.

12. A computer program product, characterized in that, When the instructions in the computer program product are executed by the processor of the electronic device, the electronic device performs the start-up control method for a multi-roll mill as described in any one of claims 1-8.

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