Control method and system for preventing strip steel from deviating and hanging up in annealing furnace

Abstract

The invention relates to the technical field of automatic control of annealing furnaces, and discloses a control method for preventing strip steel from deviating and hanging up in an annealing furnace, which comprises the following steps: identifying that the strip steel enters a hot galvanizing unit annealing furnace, detecting the position of the strip steel and acquiring the state information of the strip steel; calculating the position deviation of the strip steel in the annealing furnace based on the strip steel position; performing deviation degree comparison based on the position deviation and a preset deviation threshold value, and performing automatic classification judgment; and based on the automatic classification judgment result, a deviation alarm is given out and / or the running speed of the strip steel is automatically adjusted in combination with the strip steel state information. The invention further provides a system and an annealing furnace with the system. Through automatic detection and adjustment, belt breakage accidents caused by deviation of the strip steel are avoided, the running speed of the strip steel can be differentially adjusted according to the width and the deviation degree of the strip steel, frequent manual adjustment of an operator on the deviation rectifying device is reduced, the working intensity and the labor intensity of the operator are reduced, and the automation degree is high.

Description

Technical Field

[0001] The present invention relates to the technical field of annealing furnace automatic control, and in particular to a control method and system for preventing strip steel from deviating and breaking in an annealing furnace. Background Art

[0002] The galvanizing process requires numerous pieces of equipment and long lines, and continuous operation requires no downtime. Any downtime generates significant waste and defective products, consumes significant amounts of raw materials, and increases production costs. The strip travels over two thousand meters between the uncoiler and coiler. In actual production, especially when the line is operating at high speeds, the strip can deviate significantly due to factors such as the strip material, annealing furnace temperature, and the presence of rollers. This can cause strip breakage and sudden shutdown, resulting in significant waste and potentially serious damage to the equipment. For example, the annealing furnace section is a crucial step in the galvanizing process. Due to factors such as the strip material and furnace temperature, strip deviation often occurs, leading to strip edges cracking within the furnace. If operators fail to reduce the speed promptly, the strip can deviate and catch on the furnace wall, causing cracking or even breakage. Once the strip breaks, the furnace must be cooled, shut down, and purged. The strip must then be reconnected and reheated before being reopened for purge and reheating. A belt break in a furnace can cause a loss of more than 24 hours, resulting in huge economic losses.

[0003] Therefore, there is a need in the prior art to improve the control method for preventing the strip from running off course and getting hung up in the annealing furnace. Summary of the Invention

[0004] In view of this, the purpose of the embodiment of the present invention is to propose a control method for preventing the strip from running off and breaking in the annealing furnace. Through automatic detection and adjustment, the strip is prevented from running off and breaking in the annealing furnace of the continuous hot-dip galvanizing unit, thereby improving the operating rate of the galvanizing unit and the yield rate of the product.

[0005] Based on the above objectives, an embodiment of the present invention provides a control method for preventing strip steel from deviating and breaking in an annealing furnace, comprising: S1 identifies the strip entering the annealing furnace of the hot-dip galvanizing unit, detects the strip position and obtains the strip status information; S2 calculates the position deviation of the strip in the annealing furnace based on the strip position; S3 compares the position deviation with the preset deviation threshold and performs automatic classification and judgment; S4 issues a deviation alarm and / or automatically adjusts the running speed of the strip based on the automatic classification judgment results and combined with the strip status information.

[0006] In some embodiments, in S1, detecting the position of the strip includes: starting from identifying the position where the strip enters the annealing furnace of the hot-dip galvanizing unit, detecting the position coordinates of the strip in the annealing furnace, and identifying the position area of the strip, which includes a preheating section, a heating section, and a soaking section.

[0007] In some embodiments, in S1, the status information includes the strip coil number, steel type, strip width, thickness, and steel rod running speed.

[0008] In some embodiments, in S2, calculating the position deviation of the steel strip in the annealing furnace based on the steel strip position includes: The real-time position deviation is calculated based on the comparison between the actual position of the strip and the preset strip centerline position, as well as the comparison between the frame displacement of the correction device.

[0009] In some embodiments, in S3, the deviation threshold includes: a deviation threshold between the actual position of the steel strip and the center line of the steel strip, and a displacement threshold of the correction device frame.

[0010] In some embodiments, in S4, the automatic classification determination result includes: If the position deviation is less than the preset deviation threshold, it is judged as qualified; If the position deviation is greater than the preset deviation threshold but less than twice the deviation threshold, it is judged as a level one deviation; If the position deviation is greater than twice the deviation threshold, it is judged as a level 2 deviation.

[0011] In some embodiments, when the judgment result is a first-level deviation, the running speed of the strip is automatically adjusted to a low-speed deviation correction gear or an ultra-low-speed deviation correction gear in combination with the width information of the strip; When the judgment result is a second-level deviation, a deviation alarm is issued and the speed is automatically adjusted to 0.

[0012] In some embodiments, the low-speed correction gear is to reduce the speed to 30 m / min, and the ultra-low-speed correction gear is to reduce the speed to 10 m / min.

[0013] Another aspect of the present invention provides a control system for preventing strip steel from deviating and breaking in an annealing furnace, which is used to implement the above method, including: An identification module configured to identify the strip steel entering the annealing furnace of the hot-dip galvanizing unit, detect the position of the strip steel and obtain the strip steel status information; a calculation module configured to calculate a position deviation of the strip in the annealing furnace based on the position of the strip; A classification module is configured to compare the deviation degree with a preset deviation threshold based on the position deviation and perform automatic classification judgment; The speed control module is configured to issue a deviation alarm and / or automatically adjust the running speed of the strip based on the automatic classification judgment result and in combination with the strip state information.

[0014] In another aspect, the present invention provides an annealing furnace having the above control system for preventing the strip steel from deviating and breaking in the annealing furnace.

[0015] The present invention has at least the following beneficial technical effects: The present invention provides a control method for preventing the strip steel from deviating and breaking in the annealing furnace. Through automatic detection and adjustment, the strip breakage accident caused by the strip steel deviating is avoided, and the time loss of a series of complex operations such as cooling, stopping the furnace, purging, splicing, and heating required for strip breakage is reduced. In addition, the strip steel running speed can be adjusted differentially according to the strip steel width and the degree of deviation, thereby reducing the operator's frequent manual adjustment of the correction device, reducing the operator's work intensity and labor intensity, and having a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of an embodiment of a control method for preventing strip steel from deviating and breaking in an annealing furnace provided by the present invention. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present invention pertains; the terms used in the specification herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention; for example, the directions or positions indicated by the terms "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are for ease of description only and should not be construed as limiting the present technical solution.

[0020] The terms "including," "having," and any variations thereof in the present specification, claims, and accompanying drawings are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the present specification, claims, and accompanying drawings are used to distinguish between different items, not to describe a particular order. "Multiple" means two or more, unless otherwise expressly specified.

[0021] In the specification and claims of the present invention and the above-mentioned description of the drawings, when an element is referred to as being “fixed to,” “mounted on,” “disposed on,” or “connected to” another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being “connected to” another element, it may be directly or indirectly connected to the other element.

[0022] Furthermore, references herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] The production process of a continuous hot-dip galvanizing unit mainly includes the following main processes: uncoiling, welding, cleaning, annealing, hot-dip galvanizing, post-galvanizing cooling, finishing, surface treatment, trimming, inspection, oiling and coiling. In the production process of a continuous hot-dip galvanizing unit, the annealing furnace is one of the key equipment. Its main function is to complete the annealing process of the strip, eliminate rolling stress, improve mechanical properties, and provide good surface conditions for the subsequent galvanizing process. Specifically, the strip enters the furnace through the sealing rollers at the entrance of the annealing furnace. The annealing furnace is usually equipped with a tensioning roller to give the strip a certain tension to ensure its stable operation in the furnace. In the furnace, the strip passes through multiple zones such as the preheating section, heating section, and soaking section, gradually heating up and completing the annealing process.

[0024] However, strip deviation in the annealing furnace has always been a major factor affecting production efficiency and product quality. The reasons for strip deviation are diverse, including poor strip shape, weld defects, insufficient equipment accuracy, and delayed operator response.

[0025] If the strip deviates significantly, it may catch on the furnace wall, causing the strip to crack or even break, leading to downtime. Currently, the industry has several technologies in place to prevent strip deviation. For example, real-time monitoring of strip tension differences and adjustment of the mill roll gap enable dynamic strip deviation correction. Furthermore, infrared thermal imaging technology is being used in annealing furnaces to monitor the condition of the furnace lining in real time, preventing equipment failures caused by lining damage. However, these technologies often rely on manual operation or single monitoring methods, making them difficult to completely prevent strip deviation.

[0026] Therefore, the present invention proposes a control method for preventing strip steel from deviating and breaking in an annealing furnace, comprising the following steps: S1 identifies the strip entering the annealing furnace of the hot-dip galvanizing unit, detects the strip position and obtains the strip status information; S2 calculates the position deviation of the strip in the annealing furnace based on the strip position; S3 compares the position deviation with the preset deviation threshold and performs automatic classification and judgment; S4 issues a deviation alarm and / or automatically adjusts the running speed of the strip based on the automatic classification judgment results and combined with the strip status information.

[0027] Furthermore, in S1, detecting the strip position includes: starting from the position where the strip enters the annealing furnace of the hot-dip galvanizing unit, detecting the strip's position coordinates in the annealing furnace, and identifying the strip's position area, which includes the preheating section, heating section, and soaking section. Status information includes the strip's coil number, steel grade, strip width, thickness, and steel bar running speed.

[0028] Furthermore, in S2, calculating the position deviation of the steel strip in the annealing furnace based on the steel strip position includes: The real-time position deviation is calculated based on the comparison between the actual position of the strip and the preset strip centerline position, as well as the comparison between the frame displacement of the correction device.

[0029] Furthermore, in S3, the deviation threshold includes: a deviation threshold between the actual position of the strip and the center line of the strip, and a displacement threshold of the correction device frame.

[0030] Furthermore, in S4, the automatic classification judgment result includes: If the position deviation is less than the preset deviation threshold, it is judged as qualified; If the position deviation is greater than the preset deviation threshold but less than twice the deviation threshold, it is judged as a level one deviation; If the position deviation is greater than twice the deviation threshold, it is judged as a level 2 deviation.

[0031] In some embodiments, when the judgment result is a first-level deviation, the running speed of the strip is automatically adjusted to a low-speed deviation correction gear or an ultra-low-speed deviation correction gear in combination with the width information of the strip; When the judgment result is a second-level deviation, a deviation alarm is issued and the speed is automatically adjusted to 0.

[0032] In some embodiments, the low-speed correction gear is to reduce the speed to 30 m / min, and the ultra-low-speed correction gear is to reduce the speed to 10 m / min.

[0033] Another aspect of the present invention provides a control system for preventing strip steel from deviating and breaking in an annealing furnace, which is used to implement the above-mentioned method, comprising: An identification module configured to identify the strip steel entering the annealing furnace of the hot-dip galvanizing unit, detect the position of the strip steel and obtain the strip steel status information; a calculation module configured to calculate a position deviation of the strip in the annealing furnace based on the position of the strip; A classification module is configured to compare the deviation degree with a preset deviation threshold based on the position deviation and perform automatic classification judgment; The speed control module is configured to issue a deviation alarm and / or automatically adjust the running speed of the strip based on the automatic classification judgment result and in combination with the strip state information.

[0034] In another aspect, the present invention provides an annealing furnace having the above-mentioned control system for preventing the strip steel from deviating and breaking in the annealing furnace.

[0035] The present invention will be further described below with reference to specific embodiments.

[0036] The annealing furnace includes two guide rails along the rollers, a control system, and an HMI (Human Machine Interface). The system verifies data for guide rails No. 1 and No. 2 within the annealing furnace, accurately determines the displacement of the guide rails to the limit, and corrects the strip centerline to ensure it aligns as closely as possible with the centerline of the mill. Data is also available for determining the deviation thresholds at which strip centerlines of varying widths are susceptible to snagging on the furnace wall. The galvanizing unit's HMI (Human Machine Interface) has been updated with a function that flashes red to alert the operator if the strip centerline of the No. 1 guide rail deviates by more than ±20cm or the guide rail displacement exceeds ±140°. The galvanizing unit's HMI has also been updated with a function that flashes red to alert the operator if the strip centerline of the No. 2 guide rail deviates by more than ±20cm or the guide rail deviates by more than ±50°. Automatic control has been added to enable automatic speed reduction based on strip width and deviation. When strip steels of different widths deviate to different degrees, instructions are issued to reduce the speed of the central section to 30m / min or 10m / min respectively.

[0037] The specific control method includes the following steps: S1 identifies the strip entering the annealing furnace of the hot-dip galvanizing unit, detects the strip position and obtains strip status information, including the strip coil number, steel type, strip width, thickness and steel bar running speed. The strip width is divided into three categories: 1250mm ≤ plate width, 960mm < plate width < 1250mm, and plate width ≤ 960mm; S2 calculates the position deviation of the strip in the annealing furnace based on the strip position, specifically, identifies the strip centerline deviation and / or frame deviation; S3 compares the position deviation with the preset deviation threshold and performs automatic classification and judgment; Based on the automatic classification results and combined with strip status information, S4 issues deviation alerts and / or automatically adjusts the strip's running speed. The specific speed adjustments are shown in Table 1. When the center section speed exceeds 30 m / min, a command to reduce the speed to 30 m / min is triggered, issuing a rising edge command to reduce the center section speed to 30 m / min. The unit then enters a low-speed correction mode to prevent the strip from catching on the furnace wall and causing breakage or tearing. Once the strip deviation condition improves, the operator sets the center section speed value on the operation screen and gradually increases the speed. When the center section speed exceeds 10 m / min, a command to reduce the speed to 10 m / min is triggered, issuing a rising edge command to reduce the center section speed to 10 m / min. The unit then enters an ultra-low-speed correction mode to prevent the strip from catching on the furnace wall and causing breakage or tearing. Once the strip deviation condition improves, the operator sets the center section speed value on the operation screen and gradually increases the speed.

[0038]

[0039] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope of the embodiments disclosed in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless expressly limited to the singular.

[0040] It should be understood that, as used herein, the singular forms "a" and "an" are intended to include the plural forms as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" is intended to include any and all possible combinations of one or more of the associated listed items.

[0041] The serial numbers of the embodiments disclosed in the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0042] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to limit the scope of the disclosure of the present invention (including the claims) to these examples. Within the spirit of the present invention, the technical features of the above embodiments or different embodiments may be combined, and many other variations exist in different aspects of the above embodiments, which are not provided in detail for the sake of clarity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for preventing strip steel from running off course and breaking in an annealing furnace, characterized in that: include: S1 identifies the strip entering the annealing furnace of the hot-dip galvanizing unit, detects the strip position and obtains the strip status information; S2 calculating the position deviation of the steel strip in the annealing furnace based on the position of the steel strip; S3 compares the position deviation with a preset deviation threshold and performs automatic classification and judgment; S4 issues a deviation alarm and / or automatically adjusts the running speed of the strip based on the automatic classification judgment result and in combination with the strip state information.

2. The control method for preventing strip steel from deviating and breaking in an annealing furnace according to claim 1, characterized in that: In S1, detecting the position of the steel strip includes: starting from identifying the position where the steel strip enters the annealing furnace of the hot-dip galvanizing unit, detecting the position coordinates of the steel strip in the annealing furnace, and identifying the position area of the steel strip, wherein the position area includes a preheating section, a heating section, and a soaking section.

3. The control method for preventing strip steel from deviating and breaking in an annealing furnace according to claim 1, characterized in that: In S1, the status information includes the strip coil number, steel type, strip width, thickness and steel rod running speed.

4. The control method for preventing strip steel from deviating and breaking in an annealing furnace according to claim 1, characterized in that: In S2, calculating the position deviation of the steel strip in the annealing furnace based on the steel strip position includes: Based on the comparison between the actual position of the strip and the preset strip centerline position, and the comparison between the frame displacement of the correction device, the real-time position deviation is calculated.

5. The control method for preventing strip steel from deviating and breaking in an annealing furnace according to claim 1, characterized in that: In S3, the deviation threshold includes: a deviation threshold between the actual position of the strip and the center line of the strip, and a displacement threshold of the correction device frame.

6. The control method for preventing strip steel from deviating and breaking in an annealing furnace according to claim 1, characterized in that: In S4, the automatic classification judgment result includes: If the position deviation is less than the preset deviation threshold, it is judged as qualified; If the position deviation is greater than the preset deviation threshold but less than twice the deviation threshold, it is determined to be a first-level deviation; The position deviation is greater than twice the deviation threshold and is determined to be a level 2 deviation.

7. The control method for preventing strip steel from deviating and breaking in an annealing furnace according to claim 6, characterized in that: When the judgment result is a first-level deviation, the running speed of the strip is automatically adjusted to a low-speed deviation correction gear or an ultra-low-speed deviation correction gear in combination with the width information of the strip; When the judgment result is a second-level deviation, a deviation alarm is issued and the speed is automatically adjusted to 0.

8. The control method for preventing strip steel from deviating and breaking in an annealing furnace according to claim 7, characterized in that: The low-speed correction gear is used to reduce the speed to 30 m / min, and the ultra-low-speed correction gear is used to reduce the speed to 10 m / min.

9. A control system for preventing strip steel from deviating and breaking in an annealing furnace, used to implement the method according to any one of claims 1 to 8, characterized in that: include: An identification module configured to identify the strip steel entering the annealing furnace of the hot-dip galvanizing unit, detect the position of the strip steel and obtain the strip steel status information; a calculation module configured to calculate a position deviation of the steel strip in the annealing furnace based on the position of the steel strip; A classification module configured to compare the deviation between the position deviation and a preset deviation threshold and perform automatic classification judgment; The speed regulating module is configured to issue a deviation alarm and / or automatically adjust the running speed of the strip based on the automatic classification judgment result and in combination with the strip state information.

10. An annealing furnace having the control system for preventing strip steel from deviating and breaking in the annealing furnace as claimed in claim 9.

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