A method, device and equipment for controlling large-area underpickling defects of pickling plates and a storage medium

Abstract

This invention relates to the field of metallurgical sheet metal production technology, providing a method, apparatus, equipment, and storage medium for controlling large-area under-pickled defects in pickled sheets. By comparing thickness data with a preset torque setting matrix, the corresponding process section's squeeze roller torque setting value is output and converted into control commands, which are then output to the squeeze roller drive device. This causes the squeeze roller to apply a clamping torque matching the thickness, keeping the strip steel submerged below the acid solution surface in the pickling tank. This invention overcomes the technical bias of solving under-pickled defects by enhancing the chemical activity of the acid solution. It expands the squeeze roller from a draining tool to an immersion posture control device, fundamentally eliminating the conditions for under-pickled defects caused by strip steel being suspended from the liquid surface. The defective strip yield is reduced from 0.20% to 0. Simultaneously, it operates stably at high speeds of 150 m / min without requiring speed reduction or increased acid and energy consumption, achieving differentiated and precise control of thin, medium, and thick strip steel of all specifications. It has significant advantages such as low investment, quick results, and ease of promotion and application.

Description

Technical Field

[0001] This invention relates to the field of metallurgical sheet production technology, and in particular to a method, apparatus, equipment and storage medium for controlling large-area under-pickled defects in pickled sheets. Background Technology

[0002] Hot-rolled pickled steel sheet is an intermediate product made from high-quality hot-rolled thin plates. After pickling to remove the oxide layer, trimming, and finishing, its surface quality and usage requirements (mainly cold bending or stamping performance) fall between those of hot-rolled and cold-rolled steel sheets. It is an ideal substitute for some hot-rolled and cold-rolled steel sheets. Compared to hot-rolled steel sheets, pickled steel sheets have the following advantages: 1) Better surface quality: Because hot-rolled pickling removes the surface iron oxide scale, it improves the surface quality of the steel, facilitating welding, oiling, and painting; 2) Higher dimensional accuracy: After leveling or straightening, the sheet shape can be altered to some extent, thereby reducing unevenness deviations; 3) Improved surface finish and enhanced appearance; 4) Reduced environmental pollution caused by decentralized pickling by users. Compared to cold-rolled steel sheets, pickled steel sheets effectively reduce procurement costs for users while ensuring surface quality requirements.

[0003] Currently, both push-pull and continuous pickling lines widely utilize shallow-tank turbulent-flow pickling technology, which can improve pickling efficiency while reducing costs and consumption. However, due to process limitations, the acid depth in the pickling tank is typically maintained at only 150-200mm. Ideally, the strip steel should be fully immersed in the turbulent acid solution to complete the pickling reaction. However, during high-speed production, thin-gauge strip steel is subject to the combined effects of acid buoyancy and running tensile stress, making its edges and even the entire strip surface prone to detaching from the acid surface. This can lead to large-area under-pickling defects, severely impacting product quality.

[0004] Insufficient pickling is one of the most common surface defects in pickling units. Its formation is closely related to process parameters such as acid concentration, acid temperature, pickling speed, and scale breaking machine elongation. The direct cause is that the iron oxide scale on the strip surface is not sufficiently removed by the acid.

[0005] Currently, the conventional methods for addressing under-pickled defects are: directly reducing the pickling process speed by 20-40 m / min, or even further, to extend the residence time of the pickling solution on the strip steel to ensure complete removal of iron oxide scale; simultaneously increasing the amount of regenerated acid added, or raising the acid solution temperature, thereby enhancing the acid's dissolving and reactive capabilities. However, while these measures improve the pickling effect, they not only severely impact the production rhythm of the pickling unit and reduce overall operational efficiency, but also cause excessive consumption of energy and acid, significantly increasing production costs.

[0006] Chinese patent (application number 201710429038.4) also proposes a method to quickly prevent under-pickled defects. This method mainly improves the acid turbulence by adjusting the inlet and outlet spray flow rates, thereby enhancing the acid's activity and improving the pickling capacity of the pickling unit, ultimately ensuring the quality of the pickled product. Existing technologies all focus on strengthening the pickling capacity of the acid solution to address the issue of insufficient removal of iron oxide scale from the strip steel surface.

[0007] Therefore, it is necessary to propose a method, device, equipment, and storage medium for controlling large-area under-acidification defects in pickled plates to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0008] The main objective of this invention is to provide a method, apparatus, equipment, and storage medium for controlling large-area under-pickled defects in pickled steel strips, in order to solve the technical problem that existing technologies focus on enhancing the pickling ability of acid solutions, resulting in insufficient pickling and removal of iron oxide scale on the surface of steel strips.

[0009] To achieve the above objectives, the present invention provides a method for controlling large-area under-acidification defects in pickled plates, comprising the following steps: S1, obtain the thickness data of the strip steel to be produced in the pickling unit; S2, compare the thickness data with a preset torque setting matrix, and output the torque setting value of the extrusion roller of the process section corresponding to the thickness data; wherein, the preset torque setting matrix contains at least two thickness intervals, and each thickness interval is associated with a unique torque setting value. S3, convert the torque setting value into a torque control command and output it to the drive device of the squeeze roller in the process section, so as to control the squeeze roller in the process section to apply a clamping torque corresponding to the torque setting value to the strip steel, so that the strip steel is kept submerged below the surface of the acid solution in the pickling tank.

[0010] Preferably, the preset torque setting matrix includes: When the thickness data is within a first thickness range, the torque setting value is a first torque value; When the thickness data is within the second thickness range, the torque setting value is the second torque value; When the thickness data is in the third thickness range, the torque setting value is the third torque value; Wherein, the upper limit of the thickness of the first thickness range is less than the lower limit of the thickness of the second thickness range, the upper limit of the thickness of the second thickness range is less than the lower limit of the thickness of the third thickness range, and the first torque value is less than the second torque value, and the second torque value is less than the third torque value.

[0011] Preferably, the first thickness range is a thickness less than 2.0 mm, and the first torque value is 30% of the rated torque; the second thickness range is a thickness greater than or equal to 2.0 mm and less than 5.0 mm, and the second torque value is 50% of the rated torque; the third thickness range is a thickness greater than or equal to 5.0 mm, and the third torque value is 60% of the rated torque.

[0012] Preferably, in step S2, when the pickling unit is in automatic control mode, the thickness data is read and the preset torque setting matrix is ​​automatically invoked to generate the torque setting value.

[0013] Preferably, the control method further includes: when a mode switching command is received, switching to manual control mode to receive the torque setpoint input from the outside.

[0014] Preferably, when the thickness data is less than 2.0 mm, the selection basis for the torque setting value of 30% is as follows: when the pickling unit is running at a speed of not less than 150 m / min, the torque setting value can simultaneously satisfy: ensuring that the strip is fully submerged below the surface of the acid solution in the pickling tank; and preventing the strip from undergoing plastic deformation or plate shape defects due to excessive clamping force.

[0015] Preferably, the following steps are included before step S1: Acquire the flow rate data, acid liquid level and depth data, and acid liquid turbulence status data of each acid pickling tank in the pickling unit; Based on the flow rate data of each pickling tank's acid supply pipeline, determine whether the flow rate of each pickling tank's acid supply pipeline is not less than 130 m³ / h. Determine whether the acid liquid level depth is not less than 150mm based on the acid liquid level depth data. Determine whether the acid turbulence state is a stable and uniform state based on the acid turbulence state data. If any of the above conditions are not met, an alarm signal will be issued and steps S1 to S3 will be prohibited from being executed. If all three conditions are met, proceed to step S1.

[0016] The present invention also provides a control device for large-area under-acidification defects in pickled plates, comprising: The data acquisition module is used to acquire the thickness data of the strip steel to be produced in the pickling unit. The comparison output module is used to compare the thickness data with a preset torque setting matrix and output the torque setting value of the extrusion roller of the process section corresponding to the thickness data; wherein, the preset torque setting matrix contains at least two thickness intervals, and each thickness interval is associated with a unique torque setting value. The control module is used to convert the torque setting value into a torque control command and output it to the drive device of the squeeze roller in the process section, so as to control the squeeze roller in the process section to apply a clamping torque corresponding to the torque setting value to the strip steel, so that the strip steel is kept submerged below the surface of the acid solution in the pickling tank.

[0017] The present invention also provides a control device for large-area under-acid pickling defects in pickled plates, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the control method for large-area under-acid pickling defects in pickled plates as described above.

[0018] The present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of the method for controlling large-area under-acidification defects in pickled plates as described above.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This invention overcomes the long-standing technical bias in the field of solving under-pickling by enhancing the chemical activity of acid solution, by acquiring thickness data, comparing the thickness data with a preset torque setting matrix to output the corresponding torque value, and then converting the torque value into a control command to make the squeeze roller apply clamping torque. It expands the squeeze roller from a single draining tool to an immersion posture control device, fundamentally cutting off the conditions for the formation of large-area under-pickling defects caused by strip steel being suspended from the liquid surface, and reducing the under-pickling defect strip yield from 0.20% to 0.

[0020] This invention enables strip steel to remain submerged under high-speed operating conditions, eliminating the need for traditional remedial measures of reducing the speed by 20-40 m / min. It can maintain a stable maximum speed of 150 m / min, significantly improving production efficiency compared to traditional speed reduction schemes and effectively solving the problem that existing technologies severely affect the production rhythm of pickling units.

[0021] This invention solves the problem of under-acid washing through physical intervention, without increasing the amount of regenerated acid or raising the acid temperature, thus avoiding extra energy and acid consumption, achieving energy saving and consumption reduction, and significantly reducing production costs.

[0022] Furthermore, this invention establishes a stepped mapping between thickness range and torque value through a torque setting matrix, achieving differentiated and precise control for preventing deformation in thin specifications, achieving balance in medium specifications, and ensuring drainage in thick specifications. It covers the production needs of all specifications, provides technical support for the intelligent upgrading of pickling production lines, and has outstanding advantages such as low investment, quick results, and easy promotion and application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic flowchart of one embodiment of the present invention.

[0025] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] The technical solutions of 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 a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0029] Please refer to Figure 1 The present invention provides a method for controlling large-area under-acidification defects in pickled plates, comprising the following steps: S1, obtain the thickness data of the strip steel to be produced in the pickling unit; S2, compare the thickness data with a preset torque setting matrix, and output the torque setting value of the extrusion roller of the process section corresponding to the thickness data; wherein, the preset torque setting matrix contains at least two thickness intervals, and each thickness interval is associated with a unique torque setting value. S3, convert the torque setting value into a torque control command and output it to the drive device of the squeeze roller in the process section, so as to control the squeeze roller in the process section to apply a clamping torque corresponding to the torque setting value to the strip steel, so that the strip steel is kept submerged below the surface of the acid solution in the pickling tank.

[0030] This invention overcomes the long-standing technical bias in the field of solving under-pickling by enhancing the chemical activity of acid solution, by acquiring thickness data, comparing the thickness data with a preset torque setting matrix to output the corresponding torque value, and then converting the torque value into a control command to make the squeeze roller apply clamping torque. It expands the squeeze roller from a single draining tool to an immersion posture control device, fundamentally cutting off the conditions for the formation of large-area under-pickling defects caused by strip steel being suspended from the liquid surface, and reducing the under-pickling defect strip yield from 0.20% to 0.

[0031] This invention enables strip steel to remain submerged under high-speed operating conditions, eliminating the need for traditional remedial measures of reducing the speed by 20-40 m / min. It can maintain a stable maximum speed of 150 m / min, significantly improving production efficiency compared to traditional speed reduction schemes and effectively solving the problem that existing technologies severely affect the production rhythm of pickling units.

[0032] This invention solves the problem of under-acid washing through physical intervention, without increasing the amount of regenerated acid or raising the acid temperature, thus avoiding extra energy and acid consumption, achieving energy saving and consumption reduction, and significantly reducing production costs.

[0033] Furthermore, this invention establishes a stepped mapping between thickness range and torque value through a torque setting matrix, achieving differentiated and precise control for preventing deformation in thin specifications, achieving balance in medium specifications, and ensuring drainage in thick specifications. It covers the production needs of all specifications, provides technical support for the intelligent upgrading of pickling production lines, and has outstanding advantages such as low investment, quick results, and easy promotion and application.

[0034] In a preferred embodiment, the preset torque setting matrix includes: When the thickness data is within the first thickness range, the torque setting value is the first torque value. For example, when the pickling unit produces thin-gauge strip steel with a thickness of less than 2.0 mm (such as 1.6 mm, S550MC high-strength automotive structural steel in the embodiment), the system automatically sets the torque of the squeeze roller in the process section to 30% of the rated torque. The clamping torque applied by the squeeze roller in the process section to the strip steel forms a stable constraint on it before the strip steel enters the pickling tank, ensuring that the strip steel remains submerged below the acid liquid surface when passing through the pickling tank, thus physically preventing the formation of large-area under-pickling defects. The 30% torque value used in this embodiment, after repeated debugging and verification, can achieve the optimal balance between ensuring submersion and preventing deformation.

[0035] When the thickness data falls within the second thickness range, the torque setting value is the second torque value. Medium-sized strip steel has a moderate thickness, resulting in significantly higher bending stiffness compared to thinner strip steel, and the influence of buoyancy and tensile stress on its immersion state is relatively small. However, using the same 60% torque as thicker strip steel would cause unnecessary energy consumption; using the same 30% torque as thinner strip steel might affect the acid drainage effect on the strip surface due to insufficient clamping force. This torque value ensures stable immersion of the medium-sized strip steel in the pickling tank while also ensuring that the acid on the strip surface is fully drained when it leaves the tank, preventing acid residue from affecting subsequent processes.

[0036] When the thickness data falls within the third thickness range, the torque setting value is the third torque value. Thick strip steel has higher bending stiffness and self-weight, and is less affected by buoyancy in the pickling tank, with an extremely low risk of being suspended from the liquid surface. However, thick strip steel has a larger amount of acid adhering to its surface, requiring a higher level of draining efficiency. A higher squeeze roller torque creates greater contact pressure between the squeeze roller and the strip surface, more effectively squeezing out residual acid and preventing acid from being carried out of the pickling tank, causing equipment corrosion or environmental pollution. Thick strip steel has a much higher tolerance to clamping forces than thin strip steel; a 60% torque value will not cause plastic deformation risk, while ensuring stable operation of the strip steel on the production line.

[0037] Wherein, the upper limit of the thickness of the first thickness range is less than the lower limit of the thickness of the second thickness range, the upper limit of the thickness of the second thickness range is less than the lower limit of the thickness of the third thickness range, and the first torque value is less than the second torque value, and the second torque value is less than the third torque value.

[0038] As a preferred example, the first thickness range is a thickness less than 2.0 mm, and the first torque value is 30% of the rated torque; the second thickness range is a thickness greater than or equal to 2.0 mm and less than 5.0 mm, and the second torque value is 50% of the rated torque; the third thickness range is a thickness greater than or equal to 5.0 mm, and the third torque value is 60% of the rated torque.

[0039] Further, in step S2, when the pickling unit is in automatic control mode, the thickness data is read, and the preset torque setting matrix is ​​automatically invoked to generate the torque setting value. Specifically, a strip steel specification identification device (such as a thickness gauge, a data interface of the production management system, or specification information input by the operator through a human-machine interface) is installed at the inlet section of the pickling unit. When the strip steel enters the production line, the control system automatically acquires the thickness data of the strip steel to be produced. The preset torque setting matrix in the control system establishes a mapping relationship between thickness ranges and torque setting values. After acquiring the thickness data, the matched torque setting value is automatically sent to the drive device (such as a frequency converter or servo driver) of the extrusion roller in the process section. The drive device adjusts the motor output according to the received torque command, so that the extrusion roller applies a clamping torque corresponding to the torque setting value to the strip steel.

[0040] As a further optimization, the actual torque feedback value of the squeeze roller can be monitored in real time and compared with the torque set value. If the deviation between the actual torque feedback value and the torque set value exceeds the preset allowable range, the system will automatically issue an alarm to prompt the operator to check the equipment status.

[0041] In a preferred embodiment, the control method further includes: when a mode switching command is received, switching to manual control mode to receive an externally input torque setting value.

[0042] The human-machine interface (HMI) of the pickling unit features a mode switching button, typically presented as an automatic / manual selector switch. This button can be a physical button or a virtual button on a touchscreen, and its status clearly displays the current control mode (e.g., highlighting "Automatic" or "Manual," or distinguishing them by different colors). When the operator clicks or touches the mode switching button, the HMI generates the corresponding mode switching command. When the control system switches to manual control mode, the torque setpoint input box on the HMI screen changes from read-only to editable. The operator can directly input the required torque setpoint (usually as a percentage of the rated torque, such as "30%", "50%", "60%", etc.). Manual mode serves as a reliable auxiliary to automatic mode, ensuring that production can continue even when parts of the automatic control system malfunction, avoiding production line downtime and output loss due to a single fault. Manual mode provides flexible parameter fine-tuning capabilities to meet specific quality requirements, allowing the production line to flexibly adjust processes according to needs, enhancing production flexibility. In normal production scenarios, the automatic mode can accurately adapt parameters for different specifications of strip steel, reducing manual intervention. In case of emergencies, operators can quickly switch to manual mode to flexibly respond to abnormal production situations. This function can comprehensively cover the production needs of all specifications of strip steel on the pickling line, fundamentally solving the quality defects of large-area under-pickling caused by strip steel detaching from the acid solution surface.

[0043] As a preferred example, when the thickness data is less than 2.0 mm, the selection of the torque setting value of 30% is based on the following: when the pickling unit is running at a speed of not less than 150 m / min, the torque setting value can simultaneously satisfy the following: the strip steel is fully immersed in the acid solution in the pickling tank; and the strip steel is prevented from undergoing plastic deformation or plate shape defects due to excessive clamping force.

[0044] It is worth noting that the establishment of this parameter stems from an in-depth analysis of the stress characteristics of thin-gauge strip steel: according to Archimedes' principle, strip steel with a thickness of less than 2.0 mm is lightweight and has significant buoyancy, making it extremely easy to suspend from the liquid surface under high-speed tensile stress; at the same time, according to the thin-plate theory of material mechanics, its bending stiffness is proportional to the cube of its thickness, making it extremely sensitive to clamping pressure, and excessive torque can cause edge indentations, wrinkles, or even plastic deformation. Based on the above analysis, the inventors conducted extensive field tests, systematically testing the immersion state and sheet quality of 1.6 mm S550MC high-strength automotive structural steel at a speed of 150 m / min within a torque range of 20% to 60%. The test results show that when the torque is below 30%, the strip cannot be fully submerged, and occasional edge lifting leads to under-pickled defects. When the torque is above 35%, indentations begin to appear on the strip surface, and when it is above 45%, significant plastic deformation occurs. Only when the torque is 30% is it within the safe window between the "submersion threshold" and the "deformation threshold," which is sufficient to overcome buoyancy and tensile stress to ensure full submersion of the strip, and is far below the material's yield strength to ensure no plastic damage. After adopting this preferred scheme, the example verified stable production at a maximum speed of 150 m / min without large-area under-pickled defects. The yield of under-pickled defect strips decreased from 0.20% to 0, while eliminating the need to reduce speed, increase acid consumption, or increase energy consumption. This fundamentally solves the multiple technical problems in the background technology, such as thin-gauge strips being suspended from the liquid surface causing under-pickled defects, speed reduction sacrificing efficiency, increased acid adding cost, and high torque damaging the strip shape.

[0045] In a preferred embodiment, the following steps are included before step S1: Acquire the flow rate data, acid liquid level and depth data, and acid liquid turbulence status data of each acid pickling tank in the pickling unit; Based on the flow rate data of each pickling tank's acid supply pipeline, determine whether the flow rate of each pickling tank's acid supply pipeline is not less than 130 m³ / h. Determine whether the acid liquid level depth is not less than 150mm based on the acid liquid level depth data. Determine whether the acid turbulence state is a stable and uniform state based on the acid turbulence state data. If any of the above conditions are not met, an alarm signal will be issued and steps S1 to S3 will be prohibited from being executed. If all three conditions are met, proceed to step S1.

[0046] Specifically, the system first acquires data on the acid supply pipeline flow rate, acid level depth, and acid turbulence state of each pickling tank. Flow rate data can be collected using an electromagnetic flowmeter, acid level depth data can be measured using a level sensor, and acid turbulence state data can be obtained through a visual sensor or manual observation. Then, the acquired data is compared with preset thresholds: it is determined whether the acid supply flow rate of each pickling tank is not less than 130 m³ / h, whether the acid level depth of each pickling tank is not less than 150 mm, and whether the turbulence state of each pickling tank is stable and uniform (i.e., the acid in each tank can form a continuous and uniform vortex). If all three conditions are met, it indicates that the acid circulation system is operating normally, the turbulence intensity is sufficient, and the strip immersion conditions are met, and the system automatically proceeds to step S1 to execute torque control. If any condition is not met, the system issues an alarm signal (e.g., "Acid supply flow rate of pickling tank No. 2 is 128 m³ / h, lower than the standard value of 130 m³ / h") and prohibits the execution of steps S1 to S3 until the fault is resolved and the system is re-confirmed.

[0047] Preferably, an industrial camera can be used to continuously acquire images of the pickling tank liquid surface at 30 frames per second, extract the coordinates of the vortex center point, calculate the offset of the center point between adjacent frames, and determine that the frame has undergone significant change when the offset exceeds 10mm; with a 10-second observation window, the number of frames determined to have undergone significant change in 300 frames is counted, and when the proportion of frames without significant change is not less than 95% (i.e., the number of changed frames does not exceed 15 frames), the acid liquid turbulence state is determined to be a stable and uniform state.

[0048] This implementation method ensures stable and reliable shallow tank turbulent pickling effect by forcibly guaranteeing that the acid supply flow rate, liquid level depth, and turbulence state meet the design standards. On the other hand, it establishes a logical dependency relationship between basic operating conditions and core control, avoiding batch under-pickling defects caused by blind production under conditions of insufficient pickling capacity.

[0049] To further illustrate the technical solution of this application, the following embodiments are also provided, as detailed below: A method for controlling large-area under-pickling defects on the surface of 1.6mm thick S550MC high-strength automotive structural pickled steel sheet in a pickling unit. The key control points are as follows: Regularly conduct systematic checks on the flow rate, acid turbulence intensity, and liquid level parameters of the acid supply pipelines for each pickling tank. On-site verification showed that after the acid circulation system of each tank was started, the acid in the tank formed a clear and regular vortex pattern, and the flow rate of the acid supply pipelines for each tank was greater than 130 m³ / h. 3 / h, with a liquid level depth of not less than 150mm, can ensure that the shallow tank turbulent pickling effect meets the design standard and ensures the stable and efficient operation of the pickling process.

[0050] During the production of 1.6mm and S500MC strips, the torque of the squeeze rollers in all process sections was checked and found to be in automatic mode. The torque setting of the squeeze rollers was automatically reduced from 50% to 30%. After that, the pickling line operated normally and ran to the maximum speed of 150m / min set by the production line. The overall production was stable and there were no large-area under-pickling defects caused by thin strips being suspended from the liquid surface.

[0051] After implementing the above control methods, no large-area under-acid pickling defects were found.

[0052] The present invention also provides a control device for large-area under-acidification defects in pickled plates, comprising: The data acquisition module is used to acquire the thickness data of the strip steel to be produced in the pickling unit. The comparison output module is used to compare the thickness data with a preset torque setting matrix and output the torque setting value of the extrusion roller of the process section corresponding to the thickness data; wherein, the preset torque setting matrix contains at least two thickness intervals, and each thickness interval is associated with a unique torque setting value. The control module is used to convert the torque setting value into a torque control command and output it to the drive device of the squeeze roller in the process section, so as to control the squeeze roller in the process section to apply a clamping torque corresponding to the torque setting value to the strip steel, so that the strip steel is kept submerged below the surface of the acid solution in the pickling tank.

[0053] The present invention also provides a control device for large-area under-acid pickling defects in pickled plates, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the control method for large-area under-acid pickling defects in pickled plates as described above.

[0054] The present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of the method for controlling large-area under-acidification defects in pickled plates as described above.

[0055] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0056] The above are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for controlling a large-area underpickling defect of a pickled sheet, characterized by, Includes the following steps: S1, obtain the thickness data of the strip steel to be produced in the pickling unit; S2, compare the thickness data with a preset torque setting matrix, and output the torque setting value of the extrusion roller of the process section corresponding to the thickness data; wherein, the preset torque setting matrix contains at least two thickness intervals, and each thickness interval is associated with a unique torque setting value. S3, convert the torque setting value into a torque control command and output it to the drive device of the squeeze roller in the process section, so as to control the squeeze roller in the process section to apply a clamping torque corresponding to the torque setting value to the strip steel, so that the strip steel is kept submerged below the surface of the acid solution in the pickling tank.

2. The method for controlling large-area under-acidification defects in pickled plates according to claim 1, characterized in that, The preset torque setting matrix includes: When the thickness data is within a first thickness range, the torque setting value is a first torque value; When the thickness data is within the second thickness range, the torque setting value is the second torque value; When the thickness data is in the third thickness range, the torque setting value is the third torque value; Wherein, the upper limit of the thickness of the first thickness range is less than the lower limit of the thickness of the second thickness range, the upper limit of the thickness of the second thickness range is less than the lower limit of the thickness of the third thickness range, and the first torque value is less than the second torque value, and the second torque value is less than the third torque value.

3. The method for controlling large-area under-acidification defects in pickled plates according to claim 2, characterized in that, The first thickness range is less than 2.0 mm, and the first torque value is 30% of the rated torque; the second thickness range is greater than or equal to 2.0 mm and less than 5.0 mm, and the second torque value is 50% of the rated torque; the third thickness range is greater than or equal to 5.0 mm, and the third torque value is 60% of the rated torque.

4. The method for controlling large-area under-acidification defects in pickled plates according to claim 2, characterized in that, In step S2, when the pickling unit is in automatic control mode, the thickness data is read and the preset torque setting matrix is ​​automatically invoked to generate the torque setting value.

5. The method for controlling large-area under-acidification defects in pickled plates according to claim 4, characterized in that, The control method further includes: when a mode switching command is received, switching to manual control mode to receive the externally input torque setting value.

6. The method for controlling large-area under-acidification defects in pickled plates according to claim 3, characterized in that, When the thickness data is less than 2.0 mm, the selection basis for the torque setting value of 30% is as follows: when the pickling unit is running at a speed of not less than 150 m / min, the torque setting value can simultaneously satisfy: ensure that the strip is fully submerged below the surface of the acid solution in the pickling tank; and prevent the strip from undergoing plastic deformation or plate shape defects due to excessive clamping force.

7. The method for controlling large-area under-acidification defects in pickled plates according to claim 1, characterized in that, The following steps are included before step S1: Acquire the flow rate data, acid liquid level and depth data, and acid liquid turbulence status data of each acid pickling tank in the pickling unit; Based on the flow rate data of each pickling tank's acid supply pipeline, determine whether the flow rate of each pickling tank's acid supply pipeline is not less than 130 m³ / h. Determine whether the acid liquid level depth is not less than 150mm based on the acid liquid level depth data. Determine whether the acid turbulence state is a stable and uniform state based on the acid turbulence state data. If any of the above conditions are not met, an alarm signal will be issued and steps S1 to S3 will be prohibited from being executed. If all three conditions are met, proceed to step S1.

8. A device for controlling large-area under-acidification defects in pickled plates, characterized in that, include: The data acquisition module is used to acquire the thickness data of the strip steel to be produced in the pickling unit. The comparison output module is used to compare the thickness data with a preset torque setting matrix and output the torque setting value of the extrusion roller of the process section corresponding to the thickness data; wherein, the preset torque setting matrix contains at least two thickness intervals, and each thickness interval is associated with a unique torque setting value. The control module is used to convert the torque setting value into a torque control command and output it to the drive device of the squeeze roller in the process section, so as to control the squeeze roller in the process section to apply a clamping torque corresponding to the torque setting value to the strip steel, so that the strip steel is kept submerged below the surface of the acid solution in the pickling tank.

9. A device for controlling large-area under-acidification defects in pickled plates, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for controlling large-area under-acidification defects in pickled plates as described in any one of claims 1 to 7.

10. A storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for controlling large-area under-acidification defects in pickled plates as described in any one of claims 1 to 7.

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