A control method for abnormal slab width measurement in continuous casting and rolling production lines

Abstract

The present invention belongs to the technical field of continuous rolling and continuous casting, and discloses a control method for abnormal slab width measurement of a continuous casting and continuous rolling production line, comprising: obtaining an initial width measurement value of a slab and slab classification information, wherein the slab classification information includes: the first slab in a continuous slab or a subsequent slab in a continuous slab; for the first slab in a continuous slab, comparing the initial width measurement value with a preset width threshold range, and determining the final width measurement value of the first slab based on the comparison result; for the subsequent slab in a continuous slab, obtaining the difference between the initial width measurement value and the final width measurement value of the previous slab adjacent to the subsequent slab, and comparing the difference with a preset difference threshold range, and determining the final width measurement value of the subsequent slab based on the comparison result. The control method for abnormal slab width measurement of a continuous casting and continuous rolling production line provided by the present invention can improve the reliability of width measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous casting and rolling, and in particular to a method for controlling abnormal slab width measurement of a continuous casting and rolling production line. Background Art

[0002] In the slab headless rolling production process, affected by the complex working conditions at the casting machine outlet, water spray, iron oxide scale and other factors, the slab width value measured by the width gauge is prone to distortion, which seriously affects the setting of the opening degree of downstream mechanical equipment such as vertical rollers and side guide plates, and even causes steel piling accidents. Summary of the invention

[0003] The present invention provides a method for filtering abnormal measurement values ​​of slab width in a continuous casting and rolling production line, which solves the technical problem in the prior art that the slab width value measured by a width gauge is distorted and abnormally affects the production quality in the slab headless rolling production process.

[0004] In order to solve the above technical problems, the present invention provides a control method for abnormal slab width measurement in a continuous casting and rolling production line, comprising:

[0005] Acquire an initial width measurement value of the slab and slab classification information, wherein the slab classification information includes: a first slab in a continuous slab or a subsequent slab in a continuous slab;

[0006] For a first slab in the continuous slabs, comparing the initial width measurement value with a preset width threshold range, and determining a final width measurement value of the first slab based on the comparison result;

[0007] For a subsequent slab in a continuous slab, the difference between the initial width measurement value and the final width measurement value of the previous slab adjacent to the subsequent slab is obtained, and the difference is compared with a preset difference threshold range, and the final width measurement value of the subsequent slab is determined based on the comparison result.

[0008] Furthermore, the preset width threshold range is determined based on production experience data.

[0009] Further, determining the final width measurement value of the first slab based on the comparison result includes:

[0010] When the initial width measurement value is greater than or equal to an upper limit value of a preset width threshold range, the upper limit value of the preset width threshold range is used as a final width measurement value of the first slab;

[0011] When the initial width measurement value is less than or equal to the lower limit value of the preset width threshold range, the lower limit value of the preset width threshold range is used as the final width measurement value of the first slab;

[0012] When the initial width measurement value falls within the preset width threshold range, the initial width detection value is used as the final width measurement value of the first slab.

[0013] Further, comparing the difference with a preset difference threshold range and determining the final width measurement value of the subsequent slab based on the comparison result includes:

[0014] When the difference is a negative value and the difference is less than or equal to the lower limit of the difference threshold range, the final width measurement value of the previous slab adjacent to the subsequent slab is used as the final width measurement value of the subsequent slab;

[0015] When the difference is a positive value and the difference is greater than or equal to the upper limit of the difference threshold range, obtaining the product of the difference and the empirical coefficient, and taking the sum of the product and the final width measurement value of the previous slab adjacent to the subsequent slab as the final width measurement value of the subsequent slab;

[0016] When the difference falls within the difference threshold range, the initial width detection value is used as the final width measurement value of the subsequent slab.

[0017] Furthermore, the difference threshold range is -5 to 10 mm.

[0018] Furthermore, the empirical coefficient is 50%.

[0019] Furthermore, the empirical coefficient is selected according to the value interval of the difference;

[0020] Wherein, when the difference is greater than 10 mm and less than or equal to 20 mm, the empirical coefficient is 50%;

[0021] When the difference is greater than 20 mm and less than or equal to 50 mm, the empirical coefficient is 20%;

[0022] When the difference is greater than 50 mm, the empirical coefficient is 0.

[0023] Further, the obtaining of the initial width measurement value of the slab includes:

[0024] Obtain the measured value of the casting machine outlet width gauge;

[0025] Comparing the measured value with a preset width limit range;

[0026] When the measured value is greater than the upper limit value of the width limit range, the initial width measurement value is the upper limit value of the width limit range;

[0027] When the measured value is less than the lower limit value of the width limit range, the initial width measurement value is the lower limit value of the width limit range;

[0028] When the measured value falls within the width-limiting range, the initial width measurement value is the measured value.

[0029] Further, the first slab in the continuous slab includes: a single slab, the first slab in semi-endless rolling or the first slab in endless rolling;

[0030] The subsequent slabs in the continuous slabs include: subsequent slabs relative to the first slab in semi-endless rolling or endless rolling.

[0031] Further, the slab classification information is determined based on a length tracking component.

[0032] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0033] The control method for abnormal slab width measurement of continuous casting and rolling production line provided in the embodiment of the present application classifies the slabs in continuous production according to relative positions, namely the first slab and the subsequent slabs, and adopts different associated filtering methods in combination with the initial width measurement value to ensure the reliability of width detection. Specifically, for the first slab, a width threshold range is preset, and by comparing the initial measurement value with the width threshold range, only when it falls within the width threshold range, the actual measurement value is used as the standard, otherwise the final width measurement value of the first slab is determined based on the upper and lower limits of the width threshold range; for the subsequent slabs in the continuous slabs, based on the width difference between the subsequent slab and the adjacent previous slab, the final width measurement value of the subsequent slab is determined for correction; that is, when the difference is within the preset range, the actual measurement value is used as the standard, and when it is greater than the upper limit of the difference, the actual measurement width is greater than the width of the adjacent previous slab to a certain extent, so that the sum of the width of the adjacent previous slab and the compensation value is the final width measurement value; when it is less than the width, the width of the adjacent previous slab is the final width measurement value. Therefore, by making targeted corrections to slabs at different positions, stable and reliable measurement values ​​of the slabs can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A method for controlling abnormal slab width measurement in a continuous casting and rolling production line provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0037] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0039] The present application is described below with reference to specific embodiments in conjunction with the accompanying drawings.

[0040] The embodiment of the present application provides a method for filtering abnormal slab width measurement values ​​in a continuous casting and rolling production line, thereby solving the technical problem in the prior art that in the slab headless rolling production process, the slab width values ​​measured by the width gauge are distorted and abnormal, affecting the production quality.

[0041] In order to better understand the above-mentioned technical scheme, the above-mentioned technical scheme will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical scheme of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0042] See also Figure 1 The embodiment of the present application provides a method for controlling abnormal slab width measurement in a continuous casting and rolling production line, comprising:

[0043] Acquire an initial width measurement value of the slab and slab classification information, wherein the slab classification information includes: a first slab in a continuous slab or a subsequent slab in a continuous slab;

[0044] For a first slab in the continuous slabs, comparing the initial width measurement value with a preset width threshold range, and determining a final width measurement value of the first slab based on the comparison result;

[0045] For a subsequent slab in a continuous slab, the difference between the initial width measurement value and the final width measurement value of the previous slab adjacent to the subsequent slab is obtained, and the difference is compared with a preset difference threshold range, and the final width measurement value of the subsequent slab is determined based on the comparison result.

[0046] Generally speaking, the preset width threshold range is determined based on production experience data; usually, it is statistically determined based on actual production data.

[0047] Further, determining the final width measurement value of the first slab based on the comparison result includes:

[0048] When the initial width measurement value is greater than or equal to an upper limit value of a preset width threshold range, the upper limit value of the preset width threshold range is used as a final width measurement value of the first slab;

[0049] When the initial width measurement value is less than or equal to the lower limit value of the preset width threshold range, the lower limit value of the preset width threshold range is used as the final width measurement value of the first slab;

[0050] When the initial width measurement value falls within the preset width threshold range, the initial width detection value is used as the final width measurement value of the first slab.

[0051] Further, comparing the difference with a preset difference threshold range and determining the final width measurement value of the subsequent slab based on the comparison result includes:

[0052] When the difference is a negative value and the difference is less than or equal to the lower limit of the difference threshold range, the final width measurement value of the previous slab adjacent to the subsequent slab is used as the final width measurement value of the subsequent slab;

[0053] When the difference is a positive value and the difference is greater than or equal to the upper limit of the difference threshold range, obtaining the product of the difference and the empirical coefficient, and taking the sum of the product and the final width measurement value of the previous slab adjacent to the subsequent slab as the final width measurement value of the subsequent slab;

[0054] When the difference falls within the difference threshold range, the initial width detection value is used as the final width measurement value of the subsequent slab.

[0055] In some embodiments, the difference threshold range is -5 to 10 mm.

[0056] In other embodiments, the empirical factor is 50%.

[0057] Of course, in order to improve the smoothness of the correction and the reliability of the data, the empirical coefficient is selected according to the value range of the difference;

[0058] Wherein, when the difference is greater than 10 mm and less than or equal to 20 mm, the empirical coefficient is 50%;

[0059] When the difference is greater than 20 mm and less than or equal to 50 mm, the empirical coefficient is 20%;

[0060] When the difference is greater than 50 mm, the empirical coefficient is 0, that is, the current data is considered unreliable, and the previous slab width data is used for assignment.

[0061] In order to further improve the reliability of width data, a width limit range is set and data screening is performed. The initial width measurement value of the slab is obtained including:

[0062] Obtain the measured value of the casting machine outlet width gauge;

[0063] Comparing the measured value with a preset width limit range;

[0064] When the measured value is greater than the upper limit value of the width limit range, the initial width measurement value is the upper limit value of the width limit range;

[0065] When the measured value is less than the lower limit value of the width limit range, the initial width measurement value is the lower limit value of the width limit range;

[0066] When the measured value falls within the width-limiting range, the initial width measurement value is the measured value.

[0067] Due to the characteristics of the continuous casting and rolling process itself, the slab width will not change significantly based on the lower mouth width of the crystallizer within a rolling period. Therefore, the slab width can be effectively limited to a certain range based on historical production values. The implementation form is: if the measured value exceeds the upper limit, the upper limit value is assigned to the slab width; if the measured value exceeds the lower limit, the lower limit value is assigned to the slab width. In this way, the slab width value can be controlled within a certain range.

[0068] Further, the first slab in the continuous slab includes: a single slab, the first slab in semi-endless rolling or the first slab in endless rolling;

[0069] The subsequent slabs in the continuous slabs include: subsequent slabs relative to the first slab in semi-endless rolling or endless rolling.

[0070] Further, the slab classification information is determined based on a length tracking component.

[0071] The following will be explained in conjunction with a casting machine.

[0072] After the slab width information enters the rolling mill system, the adjacent slab width comparison judgment logic is started to identify the authenticity of the current slab width information. In the case of single, semi-headless and headless first slabs, the incoming material width information is subtracted from the width information in the PDI plan, and a large amount of historical data is used to summarize the range of the difference. If it does not exceed the valid range, the incoming material information is considered correct. If it exceeds the valid range, the incoming material information is considered incorrect and replaced by an empirical value.

[0073] Except for the first slab, all headless slabs are compared with the width information of the adjacent previous slab and the difference is processed. Since the width of the slab is limited in the casting process, the effective range of the difference is limited on this basis. If the difference exceeds the upper limit, the current slab width is assigned a transition value based on the width of the previous slab; if it is less than the lower limit, the width information of the previous slab is assigned to the current slab, that is, the width information of the previous slab is continued; if it is within the range, the transmitted numerical information is used normally.

[0074] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0075] The control method for abnormal slab width measurement of continuous casting and rolling production line provided in the embodiment of the present application classifies the slabs in continuous production according to relative positions, namely the first slab and the subsequent slabs, and adopts different associated filtering methods in combination with the initial width measurement value to ensure the reliability of width detection. Specifically, for the first slab, a width threshold range is preset, and by comparing the initial measurement value with the width threshold range, only when it falls within the width threshold range, the actual measurement value is used as the standard, otherwise the final width measurement value of the first slab is determined based on the upper and lower limits of the width threshold range; for the subsequent slabs in the continuous slabs, based on the width difference between the subsequent slab and the adjacent previous slab, the final width measurement value of the subsequent slab is determined for correction; that is, when the difference is within the preset range, the actual measurement value is used as the standard, and when it is greater than the upper limit of the difference, the actual measurement width is greater than the width of the adjacent previous slab to a certain extent, so that the sum of the width of the adjacent previous slab and the compensation value is the final width measurement value; when it is less than the width, the width of the adjacent previous slab is the final width measurement value. Therefore, by making targeted corrections to slabs at different positions, stable and reliable measurement values ​​of the slabs can be obtained.

[0076] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0077] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0078] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0079] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0081] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0082] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for controlling abnormal slab width measurement in a continuous casting and rolling production line, characterized in that: include: Acquire an initial width measurement value of the slab and slab classification information, wherein the slab classification information includes: a first slab in a continuous slab or a subsequent slab in a continuous slab; For a first slab in the continuous slabs, comparing the initial width measurement value with a preset width threshold range, and determining a final width measurement value of the first slab based on the comparison result; For a subsequent slab in the continuous slab, obtaining a difference between the initial width measurement value and a final width measurement value of a previous slab adjacent to the subsequent slab, and comparing the difference with a preset difference threshold range, and determining a final width measurement value of the subsequent slab based on the comparison result; Determining the final width measurement value of the first slab based on the comparison result includes: When the initial width measurement value is greater than or equal to an upper limit value of a preset width threshold range, the upper limit value of the preset width threshold range is used as a final width measurement value of the first slab; When the initial width measurement value is less than or equal to the lower limit value of the preset width threshold range, the lower limit value of the preset width threshold range is used as the final width measurement value of the first slab; When the initial width measurement value falls within the preset width threshold range, taking the initial width measurement value as the final width measurement value of the first slab; The comparing the difference with a preset difference threshold range and determining the final width measurement value of the subsequent slab based on the comparison result includes: When the difference is a negative value and the difference is less than or equal to the lower limit of the difference threshold range, the final width measurement value of the previous slab adjacent to the subsequent slab is used as the final width measurement value of the subsequent slab; When the difference is a positive value and the difference is greater than or equal to the upper limit of the difference threshold range, obtaining the product of the difference and the empirical coefficient, and taking the sum of the product and the final width measurement value of the previous slab adjacent to the subsequent slab as the final width measurement value of the subsequent slab; When the difference falls within the difference threshold range, the initial width measurement value is used as the final width measurement value of the subsequent slab.

2. The method for controlling abnormal slab width measurement in a continuous casting and rolling production line according to claim 1, characterized in that: The preset width threshold range is determined according to production experience data.

3. The method for controlling abnormal slab width measurement in a continuous casting and rolling production line according to claim 1, characterized in that: The difference threshold range is -5~10mm.

4. The method for controlling abnormal slab width measurement in a continuous casting and rolling production line according to claim 3, characterized in that: The empirical coefficient is 50%.

5. The method for controlling abnormal slab width measurement in a continuous casting and rolling production line according to claim 3, characterized in that: The empirical coefficient is selected according to the value interval of the difference; Wherein, when the difference is greater than 10 mm and less than or equal to 20 mm, the empirical coefficient is 50%; When the difference is greater than 20 mm and less than or equal to 50 mm, the empirical coefficient is 20%; When the difference is greater than 50 mm, the empirical coefficient is 0.

6. The method for controlling abnormal slab width measurement in a continuous casting and rolling production line according to claim 1, characterized in that: The obtaining of the initial width measurement value of the slab comprises: Obtain the measured value of the casting machine outlet width gauge; Comparing the measured value with a preset width limit range; When the measured value is greater than the upper limit value of the width limit range, the initial width measurement value is the upper limit value of the width limit range; When the measured value is less than the lower limit value of the width limit range, the initial width measurement value is the lower limit value of the width limit range; When the measured value falls within the width-limiting range, the initial width measurement value is the measured value.

7. The method for controlling abnormal slab width measurement in a continuous casting and rolling production line according to claim 1, characterized in that: The first slab in the continuous slab includes: a single slab, the first slab in semi-endless rolling or the first slab in endless rolling; The subsequent slabs in the continuous slabs include: subsequent slabs relative to the first slab in semi-endless rolling or endless rolling.

8. The method for controlling abnormal slab width measurement in a continuous casting and rolling production line according to claim 7, characterized in that: The slab classification information is determined based on a length tracking component.

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