A method and system for controlling surface defects in strip steel

Abstract

This invention discloses a method and system for controlling surface defects in strip steel, applied in a defect control system. The defect control system includes a coating liquid circulation subsystem. The inner wall of the circulation pipe in the coating liquid circulation subsystem is made of a smooth material. A backwashing device is installed at a predetermined position in the circulation pipe to improve the rinsing efficiency at the predetermined position. The defect control system also includes a cleaning device and a controller. The cleaning device is connected to the circulation pipe, and the controller is connected to the cleaning device. The method includes: controlling the cleaning device to rinse the circulation pipe at every preset cleaning cycle; during the operation of the coating liquid circulation subsystem, controlling the stirring speed during the coating liquid preparation process to be greater than a first preset speed threshold, and controlling the stirring speed during the coating liquid use process to be greater than a second preset speed threshold. This method can effectively improve the surface indentation defects of strip steel, avoid the generation of batch indentation defects, and thus improve the production quality of strip steel.

Description

Technical Field

[0001] This invention relates to the technical field of metallurgical industry, and in particular to a method and system for controlling surface defects in strip steel. Background Technology

[0002] The production of grain-oriented silicon steel involves numerous processes, and any step in any of these processes can potentially affect the surface quality of the final product. Indentation defects are relatively common in the production of sheet and strip steel, especially in the production of thin grain-oriented silicon steel strips. If corresponding management measures and monitoring methods are lacking during production, the surface quality pass rate of the final strip steel will be affected, seriously impacting production. Summary of the Invention

[0003] This application provides a method and system for controlling surface defects in strip steel. This method can effectively improve the surface indentation defects of strip steel, avoid the generation of batch indentation defects, and thus improve the production quality of strip steel.

[0004] In a first aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0005] A method for controlling surface defects in steel strips is applied in a defect control system. The defect control system includes a coating liquid circulation subsystem. The inner wall of the circulation pipeline in the coating liquid circulation subsystem is made of a smooth material. A backwashing device is installed at a predetermined position in the circulation pipeline to improve the rinsing efficiency at the predetermined position. The defect control system also includes a cleaning device and a controller. The cleaning device is connected to the circulation pipeline, and the controller is connected to the cleaning device. The method includes: controlling the cleaning device to rinse the circulation pipeline every preset cleaning cycle; and controlling the stirring speed during the coating liquid preparation process to be greater than a first preset speed threshold and the stirring speed during the coating liquid use process to be greater than a second preset speed threshold during the operation of the coating liquid circulation subsystem.

[0006] Preferably, the method further includes: when the strip is detected to enter the cleaning section, controlling the pressing current of the brush roller in the cleaning section to be between 0.1A and 0.5A, and controlling the temperature of the alkaline solution used to clean the brush roller to be between 50°C and 70°C.

[0007] Preferably, the preset speed threshold is between 1000 r / min and 1500 r / min, and the second preset speed threshold is between 500 r / min and 1000 r / min.

[0008] Preferably, the defect control system further includes a sewing tool and a sewing tool blowing device, both of which are connected to the controller. The sewing tool is used to sew the beginning and end of the strip to form a seam. The method further includes: before the sewing tool sews the beginning and end of the strip, controlling the ambient temperature of the sewing tool to be above a preset sewing temperature; during the sewing process, controlling the sewing tool blowing device to blow the seam every preset blowing cycle; and after the sewing, issuing a prompt to replace the sewing tool based on the number of sewing operations performed by the sewing tool.

[0009] Preferably, the method further includes: determining the carbon jacket of the processing technology corresponding to the furnace atmosphere of the various processes in the production of grain-oriented silicon steel.

[0010] Preferably, the method further includes: before coating the strip steel, performing an indentation defect detection at each quality inspection point of each coil of strip steel, the quality inspection points including: the strip head, the middle of the strip steel and the strip tail.

[0011] Preferably, the method further includes: issuing a prompt to replace the roller set according to the set roller set replacement cycle.

[0012] Secondly, through an embodiment of the present invention, the present invention provides the following technical solution:

[0013] A control system for surface defects in steel strip includes: a coating liquid circulation subsystem, wherein the inner wall of the circulation pipe in the coating liquid circulation subsystem is made of a smooth material, a backwashing device is installed at a predetermined position in the circulation pipe, the backwashing device is used to improve the rinsing efficiency at the predetermined position, a cleaning device, and a controller. The cleaning device is connected to the circulation pipe, and the controller is connected to the cleaning device. The controller is used to control the cleaning device to rinse the circulation pipe every preset cleaning cycle. The controller is also used to control the stirring speed during the coating liquid preparation process to be greater than or equal to a preset speed threshold during the operation of the coating liquid circulation subsystem.

[0014] Preferably, the coating liquid circulation subsystem further includes a filtration device for filtering particulate matter in the coating liquid.

[0015] Preferably, the system further includes a scraper device connected to the controller. The scraper device is disposed in the roll group area. The controller is used to control the scraper device to process the abnormal point of the strip contacting the roll group when an abnormality of the strip is detected.

[0016] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0017] The method for controlling surface defects on strip steel provided in this invention replaces the circulation pipeline in the coating liquid circulation subsystem with a smooth material and installs a backwashing device at a predetermined position in the circulation pipeline. Every preset cleaning cycle, the backwashing device flushes the circulation pipeline. This backwashing device improves the flushing efficiency at the predetermined positions. Through regular cleaning and the installation of backwashing devices in dead corners of the pipeline, the flushing efficiency of the circulation pipeline is significantly improved, which helps reduce particulate matter carried in the coating liquid and thus reduces the generation of indentation defects on the strip steel surface caused by particulate matter. Furthermore, controlling the stirring speed of the coating liquid helps ensure the stirring effect during the coating liquid preparation process. Therefore, this application avoids the generation of batch indentation defects by controlling the root cause of indentation defects and controlling key points in the production process. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A flowchart of a method for controlling surface defects in strip steel provided in an embodiment of the present invention. Detailed Implementation

[0020] This application provides a method and system for controlling surface defects in strip steel. This method can effectively improve the surface indentation defects of strip steel, avoid the generation of batch indentation defects, and thus improve the production quality of strip steel.

[0021] The overall technical solution of this application embodiment is as follows:

[0022] A method for controlling surface defects in strip steel is applied in a defect control system. The defect control system includes a coating liquid circulation subsystem. The inner wall of the circulation pipeline in the coating liquid circulation subsystem is made of a smooth material. A backwashing device is installed at a predetermined position in the circulation pipeline to improve the rinsing efficiency at the predetermined position. The defect control system also includes a cleaning device and a controller. The cleaning device is connected to the circulation pipeline, and the controller is connected to the cleaning device. The method includes: controlling the cleaning device to rinse the circulation pipeline every preset cleaning cycle; controlling the stirring speed during the coating liquid preparation process to be greater than a first preset speed threshold, and controlling the stirring speed during the coating liquid use process to be greater than a second preset speed threshold during the coating liquid use process.

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] In a first aspect, the present invention provides a method for controlling surface defects in strip steel, applied in a defect control system. The defect control system includes a coating liquid circulation subsystem. The inner wall of the circulation pipe in the coating liquid circulation subsystem is made of a smooth material. A backwashing device is installed at a predetermined position in the circulation pipe to improve the rinsing efficiency at the predetermined position. The defect control system also includes a cleaning device and a controller. The cleaning device is connected to the circulation pipe, and the controller is connected to the cleaning device. Specifically, as follows... Figure 1 As shown, the method includes the following steps S101 to S104.

[0025] It should be noted that because the coating liquid easily adheres to the coating machine and pipelines, causing blockages, the coating machine and coating liquid pipelines need to be cleaned in a timely manner.

[0026] Step S101: Every preset cleaning cycle, the cleaning device is controlled to flush the circulation pipeline.

[0027] Optionally, the preset cleaning cycle can be 3 days, 4 days, or one week. Of course, the actual cleaning cycle can be set in conjunction with the on-site coating machine replacement cycle or the coating liquid circulation tank switching cycle. The inner wall of the circulation pipeline can be made of stainless steel, and the predetermined positions in the circulation pipeline can include: positions in the pipeline with a bending angle less than a preset angle, for example: a preset angle of 135°. Furthermore, the pump body inside the coating liquid circulation subsystem can also be flushed.

[0028] Specifically, setting up a backwashing device at a predetermined location includes adding interfaces for the input and output of cleaning water at positions before and after the pump body and pipelines where the bending angle is less than 135°, and the direction of the flow of the injected cleaning water is opposite to the flow direction of the coating liquid (magnesium oxide slurry).

[0029] In practical implementation, by using a smooth material for the circulation pipeline, magnesium oxide residue in the pipeline can be effectively reduced. Backflushing devices are installed at bends less than 135° in the circulation pipeline to improve the flushing efficiency of the cleaning device at predetermined locations. Furthermore, regularly cleaning the coating liquid circulation subsystem and configuration system can effectively reduce magnesium oxide residue in the circulation pipeline. Optionally, the furnace interior can be cleaned during unit maintenance to reduce iron oxide scale residue.

[0030] Furthermore, the material of the circulation pipeline can be set to a smooth material to reduce the "dead angles" that exist during the laying of the circulation pipeline. For example, reduce the angles of less than 135° in the circulation pipeline.

[0031] Step S102: During the operation of the coating liquid circulation subsystem, the stirring speed during the coating liquid preparation process is controlled to be greater than a first preset speed threshold, and the stirring speed during the coating liquid use process is controlled to be greater than a second preset speed threshold.

[0032] In one embodiment, to ensure more uniform coating liquid preparation, the first preset speed threshold can be between 1000 r / min and 1500 r / min. Since the coating liquid is circulated by a pump during use, after the coating liquid is applied to the strip surface by the coating roller, excess liquid flows back to the circulation tank. To ensure the speed of the coating liquid circulation process (the stirring speed of the circulation tank) and to avoid sedimentation and clumping of the coating liquid, the second preset speed threshold can be between 500 r / min and 1000 r / min. For example, the first preset speed threshold is 1250 r / min, and the second preset speed threshold is 900 r / min.

[0033] Furthermore, since particulate matter carried in the coating solution can directly cause indentation defects on the strip surface, the coating solution circulation subsystem can also include a filtration device to filter out particulate matter in the coating solution, thereby controlling the size of the particulate matter within a certain range. The filtration device can be located in the return tank of the coating machine and / or the return tank of the tank. For example, the filtration device can be a filter screen, which can control the size of the coating solution particulate matter within a certain range.

[0034] Optionally, to prevent the return channel from becoming clogged and causing the coating liquid to overflow, the center of the filter screen is raised. Furthermore, to prevent the coating liquid from splashing, a protective device is added around the perimeter of the filter screen.

[0035] Furthermore, to ensure the strip surface cleaning meets process requirements, brush rollers are installed in the cleaning section for cleaning operations. However, some brush bristles detach, adhering to the surface of the roller assembly along with the running strip and forming indentation defects on the strip surface. To address these issues, while ensuring the strip surface cleaning effect, this application controls the current applied to the brush rollers in the cleaning section to between 0.1A and 0.5A when the strip is detected entering the cleaning section, and controls the temperature of the alkaline solution used to clean the brush rollers to between 50°C and 70°C. For example, the current applied is 0.3A, and the temperature of the alkaline solution is 60°C.

[0036] Specifically, while ensuring the quality of strip cleaning, reducing the brush roller pressing current can reduce the force between the brush roller and the strip, thereby reducing the risk of brush bristle shedding. Similarly, lowering the alkali solution temperature can also reduce the risk of brush bristle shedding.

[0037] As an alternative embodiment, if the liquid used to wash the brush roller is an acid solution, the temperature of the acid solution used to wash the brush roller is controlled between 50°C and 70°C.

[0038] Furthermore, to prevent brush rollers from detaching and causing indentations on the strip surface, the brush roller material can be replaced with a material that prevents detachment. For example, the brush rollers in the cleaning section can be made of nylon filaments, which effectively prevents indentations on the strip surface and also avoids scratches on the strip.

[0039] Furthermore, the defect control system also includes a sewing tool and a sewing tool blowing device, both of which are connected to the controller. The sewing tool is used to sew the beginning and end of the strip to form a seam. The method further includes: before the sewing tool sews the beginning and end of the strip, controlling the ambient temperature of the sewing tool within a preset sewing temperature range; during the sewing process, controlling the sewing tool blowing device to blow the seam every preset blowing cycle; and after sewing, issuing a prompt to replace the sewing tool based on a first preset replacement cycle.

[0040] In a specific embodiment, as the sewing tool is used more frequently, the sewing shear blades will experience varying degrees of wear, leading to edge defects in localized areas of the sewn seam. As the strip moves, these edge threads will detach and adhere to the surface of the rubber roller assembly, causing indentation defects on the strip surface. To address these issues, this application employs three measures: first, increasing the ambient temperature around the sewing tool to ensure its effectiveness in low-temperature environments; second, adding a blowing device to the sewing tool and establishing a blowing cycle; and third, establishing a replacement cycle for the sewing tool to guarantee its effectiveness.

[0041] Specifically, a heating device can be installed near the sewing tool. For example, the ambient temperature around the sewing tool can be increased by adding a device for heat exchange between steam and compressed air. Optionally, the preset sewing temperature can be 5°C. As one implementation method, the heating device can be shut down for an extended period once the ambient temperature of the factory has already exceeded the preset sewing temperature.

[0042] Optionally, the preset blowing cycle can be after a single suturing. Specifically, a suturing tool blowing device is set near the suturing tool. The suturing tool blowing device is used to blow the suture. The suture is blown once after each suturing is completed, that is, the preset blowing cycle is one suturing cycle.

[0043] Specifically, the number of sutures (replacement cycle) of a suture tool can be determined based on its quality. For example, the number of sutures can be between 800 and 1000. As an example, for one type of suture tool, a prompt to replace the suture tool can be issued when the number of sutures reaches 900.

[0044] As an optional embodiment, the method for detecting the number of stitches may be: setting a proximity switch on the stitching tool, wherein detecting the number of stitches of the strip by the stitching tool may include: detecting the number of stitches of the strip by the stitching tool based on the proximity switch set on the stitching tool.

[0045] Furthermore, to improve the accuracy of replacing the sewing tool, the method also includes: after sewing, issuing a prompt to replace the sewing tool based on the number of sewing attempts, the quality of the sewing tool, and the unit maintenance cycle.

[0046] Specifically, when the sewing tool is the first sewing tool, if the unit is currently under maintenance and the sewing tool has reached the preset replacement count, a prompt to replace the sewing tool will be issued. The preset replacement count corresponds to the quality of the first sewing tool. The prompting method mentioned in this application can be an audio prompt, a visual prompt, a text warning, or a combination of these methods.

[0047] Furthermore, in order to reduce the risk of "nodule formation" on the carbon sleeve surface, which could lead to indentation defects on the strip surface, the method may further include: determining the carbon sleeve with a processing technology corresponding to the furnace atmosphere of various processes in the grain-oriented silicon steel production process.

[0048] In a specific embodiment, the rollers are divided into three categories. The first category is the annealing furnace bottom roller. As the steel throughput increases, a "nodule" phenomenon appears on the surface of the annealing furnace bottom roller, which can cause indentation defects on the strip surface. To address this problem, the method further includes: determining the carbon sleeve with the corresponding processing technology based on the furnace atmosphere of various processes in the grain-oriented silicon steel production process. That is, different carbon sleeves with different processing technologies can be selected according to the atmosphere of different furnace sections, reducing the risk of "nodule" formation on the carbon sleeve surface. The furnace atmosphere includes: hydrogen content, dew point, oxygen content, etc.

[0049] Specifically, by selecting a suitable carbon sleeve for the corresponding atmosphere, the voids on the surface of the carbon sleeve caused by oxidation and reduction can be reduced, and the nodulation phenomenon is less likely to occur. For example, under weak oxidizing humid atmosphere conditions, the carbon sleeve roller used in the annealing furnace is a "p-treatment" roller.

[0050] Furthermore, the surface of the strip steel entering the furnace can be cleaned, and the cleaning quality of the strip steel can be checked once with filter paper and tools for each roll of strip steel to ensure the cleaning quality of the strip steel surface entering the furnace.

[0051] On the other hand, to avoid "nodule formation" on the strip surface, measures are implemented to control the sources of contaminants in the strip and the furnace. Specifically, measures are formulated for abnormal unit operation. During inlet section failures, if the inlet looper volume is between 7% and 10%, or during outlet section failures, if the outlet looper volume is between 93% and 90%, the process section adopts a first-stage speed reduction control. During inlet section failures, if the inlet looper volume is between 5% and 7%, or during outlet section failures, if the outlet looper volume is between 95% and 93%, the process section adopts a second-stage speed reduction control. During inlet section failures, if the inlet looper volume is below 5%, or during outlet section failures, if the outlet looper volume exceeds 95%, the process section is directly shut down. Prioritizing speed reduction and minimizing shutdowns effectively reduces the generation of magnesia scale in the furnace.

[0052] Optionally, the first deceleration control directly reduces the speed to 30 mpm, and the second deceleration control directly reduces the speed to 15 mpm.

[0053] Furthermore, the magnesium oxide powder carried on the strip surface during operation can easily adhere to the rollers, causing protrusions and resulting in indentation defects on the strip surface. The rollers involved in this problem are mainly located at the outlet section of the decarburizing annealing unit and the inlet section of the stretching and leveling unit. To address this issue, the surface material of the rollers in contact with the strip can be replaced. Specifically, the surface material of the strip rollers can be silicone rubber (resistant to temperatures above 100°C). The replacement of this material can be limited to the rollers at the outlet section of the decarburizing annealing unit and the inlet section of the stretching and leveling unit.

[0054] As an alternative embodiment, bristles can be added around some of the rollers to remove magnesium oxide powder adhering to the roller surface. Specifically, the bristles are mainly placed in the roller area at the outlet section of the decarburizing annealing unit and the inlet section of the stretching and leveling unit.

[0055] Furthermore, because the strip surface carries chemicals such as rolling oil, the polyurethane material in contact with the rolls can easily react chemically with some of the rolling oil, causing protrusions on the roll surface and resulting in indentation defects on the strip surface. To address this problem, a method can be adopted that involves changing the rolling oil to a different composition and establishing a roll replacement cycle. For example, the rolling oil can be a moisture-curing polyurethane hot melt adhesive, and a replacement reminder can be issued according to the set roll replacement cycle, such as 6 to 9 months. Of course, the actual replacement cycle can be adjusted according to the actual needs on site.

[0056] As another alternative embodiment, while changing the rolling oil, the processing parameters of the roll set can be adjusted to avoid protrusions on the roll set surface. Specifically, a rough grinding followed by fine grinding method can be adopted. During rough grinding, a PVA grinding wheel with polishing effect is used to combine fine grinding and polishing. The parameters for rough grinding may include: black silicon carbide abrasive, N-grade hardness, 30# grit, ceramic bonding agent, and a feed rate of 0.01 mm per pass with uniform feed.

[0057] Furthermore, in order to prevent the generation of batch indentation defects, the method further includes: before coating the strip steel, performing an indentation defect detection at each quality inspection point of each coil of strip steel, including: the strip head, the middle of the strip steel and the strip tail.

[0058] Specifically, after decarburization annealing and before coating, online indentation defect detection is performed at each quality inspection point of each coil of strip at the beginning, middle, and end of the strip. Optionally, indentation defect detection can be performed using a roll group inspection method. Specifically, the roll group diameter is determined based on the defect cycle length, and the inspection scope is narrowed down based on the roll group diameter.

[0059] As another embodiment, offline quality inspection can also be performed on the strip steel. Specifically, after the strip steel is taken off the production line, a sample is taken from the tail of the strip steel, the magnesium oxide powder on the surface of the strip steel is scraped off, and an indentation defect inspection is performed to determine the indentation defects of the strip steel.

[0060] Furthermore, the defect control system may also include a scraper device located in the roll group area, and the controller is used to control the scraper device to process the abnormal point of the strip contacting the roll group when an abnormality is detected in the strip.

[0061] Specifically, by adding a scraper device to the area of ​​the roller assembly that is prone to problems, it can be put into use online after an abnormality occurs.

[0062] Furthermore, the defect control system may also include a protective net, which is set around the strip running channel to prevent foreign objects from falling off and getting caught in the surface of the rollers that the strip runs through, causing indentation defects on the strip surface.

[0063] In summary, the method for controlling surface defects in strip steel provided by this invention controls the root causes of indentation defects by taking corresponding measures and monitoring key points in the production process, thereby preventing the generation of batch indentation defects. It can be combined with actual production to analyze the locations or areas where indentation defects occur from multiple stages, directions, and angles, and formulates practical and feasible measures, which has good guiding significance for improving the surface qualification rate of grain-oriented silicon steel strip steel.

[0064] Secondly, based on the same inventive concept, this embodiment provides a control system for surface defects of strip steel, including: a coating liquid circulation subsystem, wherein the inner wall of the circulation pipeline in the coating liquid circulation subsystem is made of a smooth material, a backwashing device is provided at a predetermined position in the circulation pipeline, the backwashing device is used to improve the rinsing efficiency at the predetermined position, a cleaning device, and a controller, wherein the cleaning device is connected to the circulation pipeline, the controller is connected to the cleaning device, the controller is used to control the cleaning device to rinse the circulation pipeline every preset cleaning cycle, and the controller is also used to control the stirring speed during the coating liquid preparation process to be greater than or equal to a preset speed threshold during the operation of the coating liquid circulation subsystem.

[0065] Furthermore, the coating liquid circulation subsystem may also include a filtration device for filtering particulate matter in the coating liquid.

[0066] Furthermore, the defect control system may also include a scraper device disposed in the roll group area, and the controller is used to control the scraper device to process the abnormal point of the strip contacting the roll group when the abnormality of the strip is detected.

[0067] Furthermore, the defect control system may also include a protective net, which is set around the strip running channel to prevent foreign objects from falling off and getting caught in the surface of the rollers that the strip runs through, causing indentation defects on the strip surface.

[0068] Furthermore, the defect control system may also include a sewing tool and a sewing tool blowing device, both of which are connected to the controller. The sewing tool is used to sew the beginning and end of the strip to form a seam. The method further includes: controlling the ambient temperature of the sewing tool above a preset sewing temperature before the sewing tool sews the beginning and end of the strip; controlling the sewing tool blowing device to blow the seam every preset blowing cycle during the sewing process; and issuing a prompt to replace the sewing tool based on the number of sewing cycles performed by the sewing tool after sewing.

[0069] The control system for surface defects of strip steel provided in this embodiment of the invention has the same implementation principle and technical effect as the aforementioned method embodiment. For the sake of brevity, any parts not mentioned in the system embodiment can be referred to the corresponding content in the aforementioned method embodiment.

[0070] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0071] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method of controlling surface defects of a steel strip, characterized by, The method is applied in a defect control system, which includes a coating liquid circulation subsystem. The inner wall of the circulation pipe in the coating liquid circulation subsystem is made of a smooth material. A backwashing device is installed at a predetermined position in the circulation pipe to improve the rinsing efficiency at the predetermined position. The defect control system also includes a cleaning device and a controller. The cleaning device is connected to the circulation pipe, and the controller is connected to the cleaning device. The method includes: Every preset cleaning cycle, the cleaning device is controlled to flush the circulation pipeline; During the operation of the coating liquid circulation subsystem, the stirring speed during the coating liquid preparation process is controlled to be greater than a first preset speed threshold, and the stirring speed during the coating liquid use process is controlled to be greater than a second preset speed threshold. The backwashing device includes interfaces for inputting and discharging cleaning water at positions before and after the pump body and pipeline with a bending angle of less than 135°, and the direction of the injected cleaning water flow is opposite to the direction of the coating liquid flow; the first preset speed threshold is between 1000 r / min and 1500 r / min, and the second preset speed threshold is between 500 r / min and 1000 r / min.

2. The method of claim 1, wherein, Also includes: When the strip steel is detected to enter the cleaning section, the pressing current of the brush roller in the cleaning section is controlled between 0.1A and 0.5A, and the temperature of the alkaline solution used to clean the brush roller is controlled between 50°C and 70°C.

3. The method of claim 1, wherein, The defect control system further includes a sewing tool and a sewing tool blowing device, both of which are connected to the controller. The sewing tool is used to sew the beginning and end of the strip to form a seam in the strip. The method further includes: Before the sewing tool sews the beginning and end of the strip, the ambient temperature of the sewing tool is controlled above the preset sewing temperature. During the suturing process, the suturing tool blowing device is controlled to blow the suture seam every preset blowing cycle; After the suturing is completed, a prompt is issued to replace the suturing tool based on the number of times the suturing tool has been used.

4. The method of claim 1, wherein, Also includes: Based on the furnace atmosphere of various processes in the production of grain-oriented silicon steel, the carbon jacket of the processing technology corresponding to the atmosphere is determined.

5. The method of claim 1, wherein, Also includes: Before coating the strip, each coil of strip is inspected for indentation defects at its quality inspection points, including the strip head, the middle of the strip, and the strip tail.

6. The method of claim 1, wherein, Also includes: The system will issue a prompt to replace the rollers according to the set roller replacement cycle.

7. A strip steel surface defect control system characterized by, include: A coating liquid circulation subsystem, wherein the inner wall of the circulation pipeline in the coating liquid circulation subsystem is made of a smooth material, and a backwashing device is provided at a predetermined position in the circulation pipeline, the backwashing device being used to improve the rinsing efficiency at the predetermined position; The cleaning device and controller are provided. The cleaning device is connected to the circulation pipeline, and the controller is connected to the cleaning device. The controller is used to control the cleaning device to flush the circulation pipeline every preset cleaning cycle. The controller is also used to control the stirring speed during the coating liquid preparation process to be greater than a first preset speed threshold and the stirring speed during the coating liquid use process to be greater than a second preset speed threshold during the operation of the coating liquid circulation subsystem. The backwashing device includes interfaces for inputting and discharging cleaning water at positions before and after the pump body and pipeline with a bending angle of less than 135°, and the direction of the injected cleaning water flow is opposite to the direction of the coating liquid flow; the first preset speed threshold is between 1000 r / min and 1500 r / min, and the second preset speed threshold is between 500 r / min and 1000 r / min.

8. The system of claim 7, wherein, The coating liquid circulation subsystem also includes a filtration device for filtering particulate matter in the coating liquid.

9. The system of claim 7, wherein, Also includes: A scraper device is connected to the controller and is disposed in the roll group area. The controller is used to control the scraper device to process the abnormal point of the strip contacting the roll group when an abnormality is detected in the strip.

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