Bell-type furnace air tightness detection method and system

Abstract

The invention relates to the technical field of silicon steel production, and particularly discloses a bell-type furnace airtightness detection method and system.The method comprises the steps that hydrogen concentration information is obtained based on a hydrogen concentration sensor in the annealing treatment process; judging whether a suspected gas leakage event occurs or not according to the hydrogen concentration information and the reference concentration information; when the suspected gas leakage event occurs and after the current annealing treatment is finished, performing pressurization gas leakage detection on the bell-type furnace, and judging whether the bell-type furnace has a gas leakage event or not; when an air leakage event occurs, flaw detection is performed on the inner cover of the bell-type furnace based on the flaw detection assembly to generate a flaw detection image, and the flaw detection image is analyzed to obtain air leakage object information; according to the method, process monitoring and off-line accurate detection are combined, the timeliness and reliability of bell-type furnace air tightness detection and the accuracy of air leakage point positioning are improved, multi-stage automatic real-time bell-type furnace air tightness detection is achieved, and it is guaranteed that an air tightness detection result has timeliness and accuracy.

Description

Technical Field

[0001] This application relates to the technical field of silicon steel production, and more particularly, to a method and system for detecting the airtightness of a bell-type furnace. Background Art

[0002] In the process of silicon steel production, the process treatment flow is a key link determining the quality and performance of the product. Its core steps include normalizing pickling, cold rolling, decarburization annealing, high-temperature annealing, etc. Among them, the high-temperature annealing link is particularly important for the microstructure regulation and performance improvement of silicon steel coils. In high-temperature annealing treatment, as a key device, the bell-type furnace provides a necessary reducing or protective atmosphere for the silicon steel coil by continuously inputting a process gas composed of hydrogen and nitrogen to achieve an ideal annealing effect. Hydrogen, as a reducing gas, can remove oxide impurities on the surface of the steel coil and purify the steel body, while nitrogen is used to maintain an inert protective atmosphere in the furnace.

[0003] However, the airtightness of the bell-type furnace has a decisive impact on the annealing effect. If there is a leak in the furnace body, it will cause fluctuations in the concentration of the protective gas, leading to defects such as steel coil oxidation and abnormal secondary recrystallization, seriously reducing the product quality. At present, the industry mainly uses manual pressure testing to detect airtightness. This method has obvious lag, cannot monitor the leakage points in real time, and relies on manual experience to judge, making it difficult to meet the rapid detection requirements in complex production scenarios.

[0004] In response to the above problems, there is currently no effective technical solution. Summary of the Invention

[0005] The purpose of this application is to provide a method and system for detecting the airtightness of a bell-type furnace to achieve multi-level automated real-time airtightness detection of the bell-type furnace and ensure the timeliness and accuracy of the airtightness detection results.

[0006] In a first aspect, this application provides a method for detecting the airtightness of a bell-type furnace, which is applied to a bell-type furnace. A hydrogen concentration sensor is provided on the exhaust pipeline of the bell-type furnace. The method includes the following steps: S1. Obtain hydrogen concentration information based on the hydrogen concentration sensor during the annealing process; S2. Determine whether a suspected air leakage event occurs according to the hydrogen concentration information and the reference concentration information; S3. When a suspected air leakage event occurs and after the current annealing process ends, perform a pressurized air leakage detection on the bell-type furnace to determine whether an air leakage event occurs in the bell-type furnace; S4. When an air leakage event occurs, perform flaw detection on the inner hood of the bell-type furnace based on a flaw detection component to generate a flaw detection image, and analyze the flaw detection image to locate and obtain air leakage object information.

[0007] This method combines process monitoring and off-line precise detection, improving the timeliness, reliability of the airtightness detection of the bell-type furnace and the accuracy of leak point location, realizing the multi-level automatic real-time airtightness detection of the bell-type furnace, and ensuring the timeliness and accuracy of the airtightness detection results.

[0008] The described airtightness detection method for the bell-type furnace, wherein a pressure sensor is provided on the bell-type furnace; The step of performing pressurized leak detection on the bell-type furnace and determining whether a leak event occurs in the bell-type furnace includes: S31. Control to close the exhaust valve on the exhaust pipe; S32. Inflate and pressurize the bell-type furnace based on a preset intake air volume; S33. Obtain the air pressure change information of the bell-type furnace within a preset time period based on the pressure sensor; S34. Determine whether a leak event occurs in the bell-type furnace according to the air pressure change information.

[0009] The above processing method provides an objective and quantifiable leak determination method, improving the accuracy and reliability of the detection.

[0010] The described airtightness detection method for the bell-type furnace, wherein the method further includes the following steps: S5. Analyze the air pressure change information to obtain the first leak degree information, and analyze the leak object information to obtain the second leak degree information; S6. Verify the second leak degree information based on the first leak degree information to determine whether there are other leak objects.

[0011] The comparison and verification process of this example can determine whether there are other leak objects. Thus, a means for verifying the integrity of the flaw detection result is provided, improving the comprehensiveness of the leak detection.

[0012] The described airtightness detection method for the bell-type furnace, wherein a temperature sensor is provided in the bell-type furnace; step S33 includes: S331. Obtain the air pressure change information of the bell-type furnace within a preset time period based on the pressure sensor, and at the same time obtain the temperature change information of the bell-type furnace within the preset time period based on the temperature sensor; Step S34 includes: S341. Compensate the air pressure change information based on the temperature change information, and determine whether a leak event occurs in the bell-type furnace according to the compensated air pressure change information.

[0013] The described airtightness detection method for the bell-type furnace, wherein step S4 includes: S41. When a gas leakage event occurs, transfer the inner cover of the bell-type furnace to the flaw detection station, where the flaw detection assembly is provided. S42. Based on the flaw detection assembly, perform flaw detection on the weld seam of the inner cover of the bell-type furnace to generate a flaw detection image. S43. Analyze the flaw detection image based on the threshold analysis method to obtain gas leakage object information, where the gas leakage object information includes the graphic information and position information of the gas leakage object.

[0014] In the bell-type furnace airtightness detection method, the flaw detection assembly includes: a chassis, an annular track, a displacement drive assembly, and an X-ray flaw detector. The annular track is installed on the chassis, and the X-ray flaw detector is slidably installed on the annular track. The displacement drive assembly is used to drive the X-ray flaw detector to move on the annular track to perform flaw detection on the weld seam of the inner cover of the bell-type furnace.

[0015] In the bell-type furnace airtightness detection method, there are multiple annular tracks, and each annular track is provided with an X-ray flaw detector.

[0016] In the bell-type furnace airtightness detection method, step S4 further includes: S44. According to the position information and the preset space conversion rule regarding the inner cover of the bell-type furnace, obtain the spatial position information of the gas leakage object.

[0017] In the bell-type furnace airtightness detection method, step S2 includes: S21. Judge whether the hydrogen concentration information is continuously lower than the reference concentration information at a preset number of time points. If so, it is considered that a suspected gas leakage event has occurred.

[0018] In a second aspect, the present application also provides a bell-type furnace airtightness detection system, which is applied in a bell-type furnace. The system includes: A hydrogen concentration sensor, which is arranged on the exhaust pipe of the bell-type furnace and is used to obtain hydrogen concentration information. A pressurization assembly, which is used to perform pressurization treatment on the bell-type furnace. A flaw detection assembly, which is used to perform flaw detection on the inner cover of the bell-type furnace to generate a flaw detection image. A controller, which is used to judge whether a suspected gas leakage event occurs according to the hydrogen concentration information and the reference concentration information during the annealing process, and is also used to perform pressurized gas leakage detection on the bell-type furnace based on the pressurization assembly when a suspected gas leakage event occurs and after the current annealing process ends, judge whether the bell-type furnace has a gas leakage event, and is used to perform flaw detection on the inner cover of the bell-type furnace based on the flaw detection assembly to generate a flaw detection image when a gas leakage event occurs, and analyze the flaw detection image to locate and obtain gas leakage object information.

[0019] The system combines process monitoring and off-line precise detection, improves the timeliness, reliability of the airtightness detection of the bell-type furnace and the accuracy of leakage point positioning, realizes the multi-level automatic real-time airtightness detection of the bell-type furnace, and ensures the timeliness and accuracy of the airtightness detection results.

[0020] As can be seen from the above, the present application provides a method and system for detecting the airtightness of a bell-type furnace. Among them, the method can obtain the hydrogen concentration information of the exhaust gas discharged from the bell-type furnace in real time during the annealing process by setting a hydrogen concentration sensor on the exhaust pipe of the bell-type furnace. It compares the obtained hydrogen concentration information with the preset reference concentration information to determine whether there is a suspected leakage event in the furnace body, and performs a pressurized leakage detection on the bell-type furnace to determine whether there is an actual leakage event. After determining that there is a leakage event, the information of the leakage object is located and obtained by analyzing the flaw detection image. Thus, the method combines process monitoring and off-line precise detection, improves the timeliness, reliability of the airtightness detection of the bell-type furnace and the accuracy of leakage point positioning, realizes the multi-level automatic real-time airtightness detection of the bell-type furnace, and ensures the timeliness and accuracy of the airtightness detection results. Description of the Drawings

[0021] Figure 1 It is a flowchart of the method for detecting the airtightness of the bell-type furnace provided by the embodiment of the present application.

[0022] Figure 2 It is a schematic structural diagram of the cooperation between the flaw detection component and the inner cover of the bell-type furnace.

[0023] Figure 3 It is a partial sectional structural diagram of the flaw detection component.

[0024] Figure 4 It is a structural diagram of the inner cover of the bell-type furnace.

[0025] Figure 5 It is a schematic electrical control structure diagram of the system for detecting the airtightness of the bell-type furnace provided by the embodiment of the present application.

[0026] Reference Numerals: 1, hydrogen concentration sensor; 2, pressurization component; 3, flaw detection component; 4, controller; 5, pressure sensor; 6, temperature sensor; 7, exhaust valve; 8, inner cover of the bell-type furnace; 31, chassis; 32, annular track; 33, displacement drive component; 34, X-ray flaw detector head; 35, positioning frame; 81, weld area; 321, gear teeth; 331, gear; 332, sliding frame; 333, reduction motor. Detailed Embodiments

[0027] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals designate like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0031] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0032] In a first aspect, please refer to Figure 1 , some embodiments of the present application provide a method for detecting the airtightness of a bell-type furnace, which is applied to a bell-type furnace. A hydrogen concentration sensor 1 is provided on the exhaust pipe of the bell-type furnace. The method includes the following steps: S1. Obtain hydrogen concentration information based on the hydrogen concentration sensor 1 during the annealing process; S2. Determine whether a suspected air leakage event occurs according to the hydrogen concentration information and the reference concentration information; S3. When a suspected air leakage event occurs and after the current annealing process ends, perform a pressurized air leakage detection on the bell-type furnace to determine whether an air leakage event occurs in the bell-type furnace; S4. When an air leakage event occurs, perform flaw detection on the inner hood 8 of the bell-type furnace based on the flaw detection component 3 to generate a flaw detection image, and analyze the flaw detection image to locate and obtain the air leakage object information.

[0033] Specifically, a hydrogen concentration sensor 1 is provided on the exhaust pipe of the bell-type furnace for monitoring the hydrogen content in the exhaust pipe of the bell-type furnace. Thus, during the annealing process, the hydrogen concentration sensor 1 can obtain the hydrogen concentration information in the exhaust gas discharged from the bell-type furnace.

[0034] More specifically, step S2 compares the obtained hydrogen concentration data with the preset reference concentration data in real time, thereby determining whether there is a suspected air leakage situation. This step provides a preliminary abnormal indication during the operation of the bell-type furnace; among them, the reference concentration information is a hydrogen concentration value set according to experience, which reflects the hydrogen concentration that the exhaust gas discharged from the exhaust pipe of the bell-type furnace should have during a normal annealing process. When the hydrogen concentration is lower than the reference concentration, it may indicate that the gas in the bell-type furnace has exchanged with the external air based on the air leakage point, or the gas in the furnace has leaked outward based on the air leakage point, thereby diluting the hydrogen.

[0035] More specifically, the initial occurrence of air leakage generally has little impact on the annealing process of the current batch of silicon steel coils, and the pressurized air leakage detection cannot be carried out during the annealing process. Therefore, if a suspected air leakage situation occurs during the judgment, step S3 will perform a pressurized air leakage detection on the bell-type furnace after the annealing process of the current batch is completed to confirm whether there is an actual air leakage event. This step uses a pressure test method to verify the airtightness of the bell-type furnace.

[0036] More specifically, if an actual air leakage event is confirmed during the pressurized air leakage detection, the flaw detection component 3 is used to perform flaw detection on the inner cover 8 of the bell-type furnace to generate a flaw detection image. By analyzing the flaw detection image, the air leakage position can be determined and the air leakage object information can be obtained. Among them, the air leakage object information is used to reflect data such as the position and shape of the air leakage points existing in the inner cover 8 of the bell-type furnace, and is used for subsequent maintenance work. In addition, the main common cause of air leakage in the inner furnace cover is the occurrence of air leakage points in the weld area 81. When an air leakage event occurs, it is generally not necessary to check for air leakage points at other positions. Therefore, step S4 mainly performs flaw detection and analysis on the area where the weld of the inner cover 8 of the bell-type furnace is located.

[0037] More specifically, in the above processing method, the step of obtaining the hydrogen concentration information provides process monitoring data. The step of judging whether a suspected air leakage event occurs based on the hydrogen concentration information uses the monitoring data for early anomaly judgment. The step of performing a pressurized air leakage detection on the bell-type furnace performs reliable air leakage confirmation when an anomaly indication appears. The step of performing flaw detection on the inner cover 8 of the bell-type furnace based on the flaw detection component 3 accurately locates the confirmed air leakage points.

[0038] The bell-type furnace airtightness detection method of the embodiment of the present application can obtain the hydrogen concentration information of the exhaust gas discharged from the bell-type furnace in real time during the annealing process by setting the hydrogen concentration sensor 1 on the exhaust pipe of the bell-type furnace. It compares the obtained hydrogen concentration information with the preset reference concentration information to judge whether there is a suspected air leakage event in the furnace body, and performs a pressurized air leakage detection on the bell-type furnace to judge whether there is an actual air leakage event. After determining that there is an air leakage event, the information of the air leakage object is located and obtained by analyzing the flaw detection image. Thus, this method combines process monitoring and offline precise detection, improves the timeliness, reliability of the bell-type furnace airtightness detection, and the accuracy of air leakage point positioning, realizes the multi-level automatic real-time airtightness detection of the bell-type furnace, and ensures that the airtightness detection result has timeliness and accuracy.

[0039] In some preferred embodiments, a pressure sensor 5 is provided on the bell-type furnace; The step of performing a pressurized air leakage detection on the bell-type furnace and judging whether there is an air leakage event in the bell-type furnace includes: S31. Control to close the exhaust valve 7 on the exhaust pipe; S32. Inflate and pressurize the bell-type furnace based on a preset intake air volume; S33. Obtain the air pressure change information of the bell-type furnace within a preset time period based on the pressure sensor 5; S34. Determine whether there is an air leakage event in the bell-type furnace according to the air pressure change information.

[0040] Specifically, the pressure sensor 5 can be installed on the furnace body of the bell-type furnace or on the gas supply pipeline for real-time monitoring of the air pressure inside the furnace. In step S31, the closing of the exhaust valve 7 on the exhaust pipeline can be achieved by sending a control signal to the valve actuator, making the furnace body form a relatively airtight space.

[0041] More specifically, in step S32, the inflation and pressurization of the bell-type furnace can be achieved by controlling the gas supply source to inject gas into the furnace until the injected gas volume reaches the set intake volume or the air pressure inside the furnace reaches the set pressurization target value.

[0042] More specifically, the set time period is used to observe the attenuation of the air pressure inside the furnace after pressurization. Judging whether there is air leakage according to the air pressure change information can be achieved by comparing the air pressure drop value within the set time period with the set threshold value, or by comparing the air pressure change area within the set time period with the set reference curve.

[0043] More specifically, for the problems of how to specifically perform the pressurization air leakage detection when a suspected air leakage event occurs and how to objectively judge whether there is air leakage according to the detection results, this solution is solved by introducing the pressure sensor 5 and refining the pressurization detection steps. First, control the closing of the exhaust valve 7 on the exhaust pipeline, thereby isolating the internal space of the bell-type furnace from the outside and creating conditions for subsequent pressurization tests. Then, based on the set intake volume, inject gas into the furnace to raise the air pressure inside the furnace to the required level for detection. Subsequently, within the set time period, use the pressure sensor 5 installed on the furnace body to continuously monitor the air pressure inside the furnace and obtain the change data of the air pressure over time. Finally, according to the obtained air pressure change information, for example, calculate the air pressure drop within the set time period and compare it with the set air leakage determination threshold value. If the air pressure drop exceeds the threshold value, it is determined that there is an air leakage event in the bell-type furnace. Thus, an objective and quantifiable air leakage determination method is provided, improving the accuracy and reliability of the detection.

[0044] In some other embodiments, a pressure sensor 5 is provided on the bell-type furnace; The steps for performing pressurization air leakage detection on the bell-type furnace and determining whether there is an air leakage event in the bell-type furnace include: S31'. Continuously inflate and pressurize the bell-type furnace based on a preset intake flow rate; S32'. Obtain the air pressure information based on the pressure sensor 5; S33'. Determine whether there is an air leakage event in the bell-type furnace according to the air pressure information and the preset air pressure threshold value.

[0045] Specifically, in the above-described embodiment, a gas with a preset intake flow rate that can generate positive pressure is input into the bell-type furnace, so that positive pressure is generated inside the bell-type furnace under normal exhaust conditions. Steps S32' and S33' are used to determine whether the pressure inside the bell-type furnace in this state is the preset air pressure threshold to determine whether a leakage event occurs in the bell-type furnace. If the bell-type furnace leaks, other pressure release points will be generated except for the exhaust pipe, resulting in the air pressure information being less than the preset air pressure threshold.

[0046] In some preferred embodiments, the method further includes the following steps: S5. Analyze the air pressure change information to obtain the first leakage degree information, and analyze the leakage object information to obtain the second leakage degree information; S6. Verify the second leakage degree information based on the first leakage degree information to determine whether there are other leakage objects.

[0047] Specifically, in step S5, the air pressure change information reflects the overall air pressure drop of the bell-type furnace within a preset time period after pressurization. The magnitude of the air pressure drop is related to the total leakage amount of the bell-type furnace. Therefore, by analyzing the air pressure change information obtained during the pressurization leakage detection process and calculating the total air pressure drop of the bell-type furnace within the preset time period, the first leakage degree information reflecting the overall leakage situation of the bell-type furnace can be obtained. The leakage object information is obtained through flaw detection and positioning, which may include the size, shape, or flaw detection signal intensity of the leakage point. By analyzing the leakage object information, the second leakage degree information representing the total leakage amount of all the detected leakage points can be obtained, and the second leakage degree information is used to reflect the total leakage situation of the known leakage points.

[0048] More specifically, step S6 compares the overall leakage degree with the leakage degree caused by the known leakage points. If the overall leakage degree is greater than the leakage degree caused by the known leakage points, it indicates that there are other undetected leakage points. If the two degrees are close, it indicates that the located leakage points basically explain the overall leakage situation. Through this comparison and verification, it is determined whether there are other leakage objects. Thus, a means for verifying the integrity of the flaw detection result is provided, improving the comprehensiveness of leakage detection.

[0049] It should be noted that when it is verified in step S6 that there are other leakage objects, the remaining flaw detection positions can be switched to continue flaw detection to obtain new leakage objects, or it can be marked that there are other leakage objects and wait for the maintenance personnel to conduct further airtightness detection.

[0050] In some preferred embodiments, a temperature sensor 6 is provided inside the bell-type furnace; step S33 includes: S331. Obtain the air pressure change information of the bell-type furnace within a preset time period based on the pressure sensor 5, and at the same time obtain the temperature change information of the bell-type furnace within the preset time period based on the temperature sensor 6; Step S34 includes: S341. Compensate the air pressure change information based on the temperature change information, and determine whether there is an air leakage event in the bell-type furnace according to the compensated air pressure change information.

[0051] Specifically, after the annealing process ends, the gas atmosphere inside the bell-type furnace is in a high-temperature state. During the pressurized air leakage detection process of step S3, the temperature inside the furnace will show a downward trend, which will affect the accuracy of obtaining the air pressure change information. Because the temperature fluctuation inside the furnace body will directly cause the change of gas pressure, it may lead to misjudgment or missed judgment. In this regard, step S341 introduces a correction action to eliminate the influence of temperature fluctuation on the gas pressure inside the furnace, so that the corrected air pressure change information can more accurately reflect the pressure drop caused by gas leakage.

[0052] More specifically, the temperature sensor 6 installed inside the bell-type furnace is used to monitor the gas temperature inside the furnace body in real time. In step S331 of performing pressurized air leakage detection, the pressure sensor 5 and the temperature sensor 6 are enabled synchronously. Within the preset time period, the pressure sensor 5 obtains the air pressure change data inside the furnace body, and at the same time, the temperature sensor 6 obtains the temperature change data inside the furnace body within the same preset time period.

[0053] More specifically, after obtaining the air pressure change information and the temperature change information, step S341 corrects the air pressure change information by using the obtained temperature change information. Specifically, according to the gas state equation, there is a relationship between temperature change and pressure change. By measuring the actual temperature change, the theoretical pressure change amount caused by the temperature change can be calculated. Subtracting this theoretical pressure change amount from the total measured air pressure change amount, what is obtained is the air pressure change information after temperature compensation. This compensated air pressure change information excludes the interference of temperature factors and more accurately reflects the actual pressure loss caused by gas leakage. Finally, based on this more accurate compensated air pressure change information, the method of the present application can reliably determine whether there is an air leakage event in the bell-type furnace, significantly improving the accuracy of air leakage detection.

[0054] In some preferred embodiments, step S4 includes: S41. When an air leakage event occurs, transfer the inner cover 8 of the bell-type furnace to the flaw detection station, and the flaw detection assembly 3 is provided at the flaw detection station; S42. Perform flaw detection on the weld of the inner cover 8 of the bell-type furnace based on the flaw detection assembly 3 to generate a flaw detection image; S43. Analyze the flaw detection image based on the threshold analysis method to obtain the air leakage object information, where the air leakage object information includes the graphic information and position information of the air leakage object.

[0055] Specifically, step S41 specifies the execution location of the flaw detection operation. Transfer the bell-type furnace to the flaw detection station equipped with the flaw detection component 3. The flaw detection operation is carried out in an area equipped with equipment, so that the inner covers 8 of different bell-type furnaces can be flaw detected based on the same flaw detection station, making full use of the workshop resources.

[0056] More specifically, the inner cover 8 of the bell-type furnace is generally hoisted and combined on the bottom frame of the bell-type furnace by a crane to wrap the silicon steel coil to be annealed from top to bottom. Therefore, the airtightness detection method of the bell-type furnace in the embodiment of the present application can control the crane to transfer the inner cover 8 of the bell-type furnace to the flaw detection station for flaw detection when an air leakage event occurs.

[0057] More specifically, based on the foregoing content, it can be known that the air leakage points mainly appear in the weld area 81 of the inner cover 8 of the bell-type furnace. Therefore, step S42 performs flaw detection on the welds on the inner cover 8 of the bell-type furnace based on the flaw detection component 3, thereby generating a flaw detection image about the weld area 81 and including the flaw detection situation.

[0058] More specifically, step S43 analyzes the flaw detection image using the threshold analysis method, and distinguishes the regions in the image by setting thresholds. The analysis result obtains the air leakage object information, and the information includes the graphic information and position information of the air leakage object. Among them, the graphic information is used to identify the shape of the air leakage point, and the position information provides the coordinates of the air leakage point in the image. This process provides the air leakage position information and solves the problems of air leakage position identification and positioning.

[0059] More specifically, the process of analyzing the flaw detection image based on the threshold analysis method can perform region division based on a preset pixel intensity threshold to extract the contour of the region that meets the threshold division condition and the central position of the corresponding contour, thereby determining the air leakage object information.

[0060] In some preferred embodiments, the flaw detection component 3 includes: a bottom frame 31, an annular track 32, a displacement driving component 33, and an X-ray flaw detector 34. The annular track 32 is installed on the bottom frame 31, and the X-ray flaw detector 34 is slidably installed on the annular track 32. The displacement driving component 33 is used to drive the X-ray flaw detector 34 to move on the annular track 32 to perform flaw detection on the welds on the inner cover 8 of the bell-type furnace.

[0061] Specifically, the annular track 32 is installed on the bottom frame 31 to provide a preset path for the movement of the X-ray flaw detector 34. As Figure 4As shown, the inner cover 8 of the bell-type furnace generally has two annular weld areas 81 located at the top and bottom. Therefore, the X-ray flaw detector head 34 is slidably mounted on the annular track 32 so that the X-ray flaw detector head 34 can detect the inner cover 8 of the bell-type furnace along an annular path to achieve flaw detection of the weld position. Thus, by driving the X-ray flaw detector head 34 to move along the annular track 32 through the displacement drive assembly 33, scanning of a specific area of the bell-type furnace can be realized, and a flaw detection image can be generated. This structure enables the flaw detector head to perform systematic scanning along the weld, improving the efficiency and accuracy of flaw detection and helping to locate the air leakage object.

[0062] More specifically, the setting of the annular track 32 enables the flaw detector head to continuously scan along the annular weld of the bell-type furnace, overcoming the limitations of manual or unstructured scanning and improving the comprehensiveness and efficiency of detection.

[0063] More specifically, the X-ray flaw detector head 34 is preferably a reflection-type X-ray flaw detector head.

[0064] In some preferred embodiments, such as Figure 2 and Figure 3 shown, the inner side of the annular track 32 has teeth 321. The displacement drive assembly 33 includes a gear 331 meshing with the teeth 321, a sliding frame 332 rotatably connected to the gear 331 and fixedly connected to the X-ray flaw detector head 34, and a reduction motor 333 installed on the sliding frame 332 for driving the gear 331 to rotate. The sliding frame 332 is slidably mounted on the annular track 32.

[0065] Specifically, in this embodiment, driving the gear 331 to rotate by the reduction motor 333 can drive the X-ray flaw detector head 34 to perform circumferential displacement along the annular track 32 to perform circumferential flaw detection on the weld of the inner cover 8 of the bell-type furnace.

[0066] More specifically, the bottom of the chassis 31 has a positioning frame 35 for defining the placement position of the inner cover 8 of the bell-type furnace to ensure that the inner cover 8 of the bell-type furnace is placed centered on the chassis 31, thereby ensuring the effectiveness of the flaw detection image obtained by the X-ray flaw detector head 34.

[0067] In some preferred embodiments, there are multiple annular tracks 32, and each annular track 32 is provided with an X-ray flaw detector head 34.

[0068] Specifically, these multiple annular tracks 32 can be arranged at different vertical positions along the height direction of the inner cover 8 of the bell-type furnace. An X-ray flaw detector head 34 is installed on each annular track 32. The displacement drive assembly 33 is connected to the X-ray flaw detector head 34 and is used to drive the X-ray flaw detector head 34 to move along its annular track 32. This arrangement enables multiple flaw detector heads to simultaneously scan the welds in different areas of the inner cover 8 of the bell-type furnace. Thus, parallel detection of multiple weld areas 81 is achieved. Since multiple flaw detector heads work simultaneously, the total time required to scan all the specified weld areas 81 on the bell-type furnace is reduced. The data collected by all the flaw detector heads is collected for analysis to determine the air leakage position. Thus, the time required to complete the weld flaw detection of the bell-type furnace is reduced, and the efficiency of the flaw detection process is improved.

[0069] More specifically, preferably two annular tracks 32 are provided and are height-adjustable on the chassis 31 to be able to adapt to welds of different heights for detection.

[0070] In some other embodiments, the flaw detection assembly 3 further includes a lifting assembly (not shown in the figure). The annular track 32 is installed on the chassis 31 in a liftable manner, and the lifting assembly is used to drive and adjust the height of the annular track 32 on the chassis 31.

[0071] Specifically, in this embodiment, preferably one annular track 32 is provided, and the lifting assembly is used to drive and adjust the vertical position of the annular track 32 on the chassis 31, realizing the variability of the flaw detection height. These components cooperate to enable the flaw detection assembly 3 to perform flaw detection on welds of different heights on the bell-type furnace. Thus, the flaw detection assembly 3 can perform flaw detection on welds of different heights on the bell-type furnace, improving the comprehensiveness of the flaw detection.

[0072] More specifically, the lifting assembly can be a vertically arranged electric linear module or a linear drive structure such as a cylinder.

[0073] In some preferred embodiments, step S4 further includes: S44. Obtain the spatial position information of the air leakage object according to the position information and the preset spatial conversion rule regarding the inner cover 8 of the bell-type furnace.

[0074] Specifically, after analyzing the flaw detection image to obtain the graphic information and position information of the air leakage object, step S44 uses the obtained position information and the pre-established spatial conversion rule to calculate and obtain the actual spatial position information of the air leakage object on the inner cover 8 of the bell-type furnace.

[0075] More specifically, the position information is the position of the air leakage point obtained by analyzing the flaw detection image in the image coordinate system or the flaw detection system coordinate system. The space conversion rule is established in advance and is used to map the position in the flaw detection image coordinate system or the flaw detection system coordinate system to the three-dimensional space coordinate system of the inner cover 8 of the bell-type furnace. Obtaining the space position information of the air leakage object solves the problem that the air leakage point cannot be accurately located only with the image position information, provides directly available space coordinate data for subsequent maintenance, marking or data recording, and improves the practicability and efficiency of air leakage positioning.

[0076] More specifically, in some embodiments, different partition regions can be preset in the inner cover 8 of the bell-type furnace, and the space conversion rule is the mapping rule for converting the position information to these partition regions, that is, the actual space position information is the identification label of the corresponding partition region. Thus, the maintenance personnel can directly and quickly determine the location area where the air leakage point is located according to the obtained identification label.

[0077] In some preferred embodiments, step S2 includes: S21. Determine whether the hydrogen concentration information is continuously lower than the reference concentration information at a preset number of time points. If so, it is considered that a suspected air leakage event has occurred.

[0078] Specifically, the above judgment method avoids misjudging a single or occasional concentration drop as a suspected air leakage event. Judging whether the hydrogen concentration information is continuous ensures that the concentration drop is a continuous phenomenon rather than a short-term fluctuation. At a preset number of time points, a time window is set, requiring the concentration to continuously be lower than the reference value for a certain duration to further filter out instantaneous interference. Continuously lower than the reference concentration information defines the threshold condition for judgment. Only when the hydrogen concentration information is continuously lower than the reference concentration information at a preset number of time points, the system determines that a suspected air leakage event has occurred. Thus, misjudgment caused by instantaneous fluctuations of the sensor or short-term disturbances in the process is avoided.

[0079] More specifically, by introducing the judgment of continuity and time window, the method of the present application further reduces the false alarm rate, enables the subsequent pressurized air leakage detection to be performed only when there are more reliable suspected signs, improves the efficiency and reliability of the detection process, ensures that the triggering of the subsequent time-consuming detection is based on more reliable preliminary evidence, and optimizes the utilization of detection resources.

[0080] In some preferred embodiments, step S21 includes: S211. Determine whether the hydrogen concentration information is continuously lower than 95% of the reference concentration information at a preset number of time points. If so, it is considered that a suspected air leakage event has occurred.

[0081] Specifically, since the acquisition of hydrogen concentration information is limited by the acquisition accuracy of the hydrogen concentration sensor 1, and in the actual production environment, the acquired hydrogen concentration information is easily affected by environmental factors, this step sets the comparison value to 95% of the reference concentration information to further reduce the false alarm rate.

[0082] In a second aspect, please refer to Figure 5 , some embodiments of the present application further provide a hermeticity detection system for a bell-type furnace, which is applied to a bell-type furnace. The system includes: A hydrogen concentration sensor 1, which is arranged on the exhaust pipe of the bell-type furnace and is used to obtain hydrogen concentration information; A pressurization assembly 2, which is used to pressurize the bell-type furnace; A flaw detection assembly 3, which is used to detect flaws in the inner hood 8 of the bell-type furnace to generate a flaw detection image; A controller 4, which is used to judge whether a suspected air leakage event occurs according to the hydrogen concentration information and the reference concentration information during the annealing process, and is also used to perform a pressurized air leakage detection on the bell-type furnace based on the pressurization assembly 2 when a suspected air leakage event occurs and after the current annealing process is completed, to judge whether the bell-type furnace has an air leakage event, and is used to perform flaw detection on the inner hood 8 of the bell-type furnace based on the flaw detection assembly 3 to generate a flaw detection image when an air leakage event occurs, and analyze the flaw detection image to locate and obtain the air leakage object information.

[0083] The hermeticity detection system for a bell-type furnace in the embodiments of the present application can obtain the hydrogen concentration information of the exhaust gas discharged from the bell-type furnace in real time during the annealing process by arranging the hydrogen concentration sensor 1 on the exhaust pipe of the bell-type furnace. It compares the obtained hydrogen concentration information with the preset reference concentration information, can judge whether a suspected air leakage event occurs in the furnace body, and performs a pressurized air leakage detection on the bell-type furnace to judge whether there is an actual air leakage event. After determining that there is an air leakage event, the information of the air leakage object is located and obtained by analyzing the flaw detection image. Thus, the system combines process monitoring and offline precise detection, improves the timeliness, reliability of the hermeticity detection of the bell-type furnace and the accuracy of air leakage point positioning, realizes the multi-level automatic real-time hermeticity detection of the bell-type furnace, and ensures that the hermeticity detection result has timeliness and accuracy.

[0084] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "certain embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0085] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention.

Claims

1. A method for detecting the airtightness of a bell-type furnace, which is applied to a bell-type furnace, characterized in that, A hydrogen concentration sensor is provided on the exhaust pipe of the bell-type furnace, and the method includes the following steps: S1. Obtain hydrogen concentration information based on the hydrogen concentration sensor during the annealing process; S2. Determine whether a suspected air leakage event occurs according to the hydrogen concentration information and the reference concentration information; S3. When a suspected air leakage event occurs and after the current annealing process ends, perform pressurized air leakage detection on the bell-type furnace to determine whether an air leakage event occurs in the bell-type furnace; S4. When an air leakage event occurs, perform flaw detection on the inner cover of the bell-type furnace based on the flaw detection component to generate a flaw detection image, and analyze the flaw detection image to locate and obtain air leakage object information.

2. The hermeticity detection method of the bell-type furnace according to claim 1, characterized in that, A pressure sensor is provided on the bell-type furnace; The step of performing pressurized air leakage detection on the bell-type furnace to determine whether an air leakage event occurs in the bell-type furnace includes: S31. Control to close the exhaust valve on the exhaust pipe; S32. Inflate and pressurize the bell-type furnace based on a preset intake air volume; S33. Obtain the air pressure change information of the bell-type furnace within a preset time period based on the pressure sensor; S34. Determine whether an air leakage event occurs in the bell-type furnace according to the air pressure change information.

3. The hermeticity detection method of the bell-type furnace according to claim 2, characterized in that, The method further includes the following steps: S5. Analyze the air pressure change information to obtain the first air leakage degree information, and analyze the air leakage object information to obtain the second air leakage degree information; S6. Verify the second air leakage degree information based on the first air leakage degree information to determine whether there are other air leakage objects.

4. The hermeticity detection method of the bell-type furnace according to claim 2, wherein, A temperature sensor is provided inside the bell-type furnace; step S33 includes: S331. Obtain the air pressure change information of the bell-type furnace within a preset time period based on the pressure sensor, and at the same time obtain the temperature change information of the bell-type furnace within the preset time period based on the temperature sensor; Step S34 includes: S341. Compensate the air pressure change information based on the temperature change information, and determine whether an air leakage event occurs in the bell-type furnace according to the compensated air pressure change information.

5. The method for detecting the airtightness of a bell-type furnace according to claim 1, characterized in that, Step S4 includes: S41. When an air leakage event occurs, transfer the inner cover of the bell-type furnace to the flaw detection station, and the flaw detection component is provided at the flaw detection station; S42. Perform flaw detection on the weld seam on the inner cover of the bell-type furnace based on the flaw detection component to generate a flaw detection image; S43. Analyze the flaw detection image based on the threshold analysis method to obtain air leakage object information, and the air leakage object information includes the graphic information and position information of the air leakage object.

6. The hermeticity detection method of the bell-type furnace according to claim 5, wherein, The flaw detection component includes: a chassis, an annular track, a displacement driving component, and an X-ray flaw detector. The annular track is installed on the chassis, the X-ray flaw detector is slidably installed on the annular track, and the displacement driving component is used to drive the X-ray flaw detector to move on the annular track to perform flaw detection on the weld seam on the inner cover of the bell-type furnace.

7. The hermeticity detection method of the bell-type furnace according to claim 6, wherein There are multiple annular tracks, and each annular track is provided with an X-ray flaw detector.

8. The hermeticity detection method of the bell-type furnace according to claim 5, characterized in that, Step S4 further includes: S44. Obtain the spatial position information of the air leakage object according to the position information and the preset spatial conversion rule regarding the inner cover of the bell-type furnace.

9. The hermeticity detection method of the bell-type furnace according to claim 1, characterized in that, Step S2 includes: S21. Determine whether the hydrogen concentration information is continuously lower than the reference concentration information at a preset number of time points. If so, a suspected air leakage event is considered to have occurred.

10. A hermeticity detection system for a bell-type furnace, which is applied in a bell-type furnace, is characterized in that, The system includes: A hydrogen concentration sensor, which is arranged on the exhaust pipe of the bell-type furnace and is used to obtain hydrogen concentration information; A pressurization component, which is used to perform pressurization treatment on the bell-type furnace; A flaw detection component, which is used to perform flaw detection on the inner cover of the bell-type furnace to generate a flaw detection image; A controller, which is used to judge whether a suspected air leakage event occurs according to the hydrogen concentration information and the reference concentration information during the annealing process, and is also used to perform pressurized air leakage detection on the bell-type furnace based on the pressurization component when a suspected air leakage event occurs and after the current annealing process ends, to judge whether an air leakage event occurs in the bell-type furnace, and is also used to perform flaw detection on the inner cover of the bell-type furnace based on the flaw detection component to generate a flaw detection image when an air leakage event occurs, and analyze the flaw detection image to locate and obtain the air leakage object information.

Images