A method for measuring and judging the morphology of strip holes

Abstract

The present application provides a method for measuring and determining the morphology of strip holes, which relates to the field of cigarettes. The morphology determination method includes obtaining the contour line of the strip hole with an image acquisition device, and obtaining the length, width, uniformity and discreteness of the strip hole based on the contour line; judging whether the morphology of the strip hole meets the standard according to the length, width, uniformity and discreteness of the strip hole; the present application constructs quantifiable indicators for the morphological characteristics of the strip holes, which can comprehensively and effectively evaluate the quality level of the strip punching morphology and the stability between different strip holes, and further guide the adjustment of the online strip punching process of heated cigarettes, which is of great significance for improving and stabilizing product quality.

Description

Technical Field

[0001] The present application relates to the field of cigarettes, and in particular to a method for measuring and determining the morphology of strip-shaped holes. Background Art

[0002] Heated cigarettes often achieve the purpose of reducing smoke temperature by drilling holes on the filter rod and introducing cold air from the outside when smoking. At present, some heated cigarette products have strip-shaped holes. One way to make strip-shaped holes is to make multiple circular holes in sequence along a certain direction. Multiple circular holes are adjacent to each other and two adjacent circular holes partially overlap. The holes formed by the combination of the punched multiple circular holes are approximately quadrilateral holes, which are strip-shaped holes. This hole shape is significantly different from traditional circular holes and one-time formed strip holes. However, there is currently a lack of reasonable quantitative indicators and detection methods to evaluate the quality of the holes, resulting in a lack of judgment and control of the quality of strip-shaped perforated heated cigarettes during the production process. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a method for measuring and judging the morphology of strip holes, which can construct quantifiable indicators, comprehensively and effectively evaluate the morphology of strip holes, and guide the improvement and optimization of the punching process.

[0004] The technical solution of this application is as follows: A method for measuring and determining the morphology of a strip hole, comprising: The contour line of the strip hole is obtained by an image acquisition device. The strip hole includes a plurality of strip holes which are sequentially opened along a predetermined direction. circular holes, two adjacent circular holes at least partially overlap; Obtain the length, width, uniformity and dispersion of the strip holes based on the contour line; Whether the shape of the strip holes meets the standards is determined based on the length, width, uniformity and dispersion of the strip holes.

[0005] Preferably, obtaining the length of the strip-shaped hole includes: Get the first circular hole and the The distance between the centers of the circular holes , get the first circular hole and the The radius of the circular hole ; Through the center distance And the radius Get the length of the strip hole, as shown in formula 1): 1); In formula 1), Indicates the length of the strip hole; Indicates the radius of the first circular hole; Indicates The radius of the circular hole.

[0006] Preferably, obtaining the width of the strip hole includes: Get the actual area of ​​the closed figure enclosed by the contour line ; Based on actual area and the length of the strip hole Get the width of the bar hole , as shown in formula 2): 2).

[0007] Preferably, obtaining the uniformity of the strip-shaped holes includes: Based on the contour of the strip hole, get the largest circular hole diameter in the strip hole and the minimum hole diameter ; based on and Obtaining the uniformity of strip holes , as shown in formula 3): 3).

[0008] Preferably, obtaining the discreteness of the strip-shaped holes includes: Get the fitted quadrilateral of the contour line, and then get the area of ​​the fitted quadrilateral ; Based on the area of ​​the fitted quadrilateral The actual area of ​​the closed figure enclosed by the contour line Get Discreteness , as shown in formula 4): 4).

[0009] Preferably, obtaining a fitting quadrilateral of the contour line includes: Based on the contour line, get the contour line corresponding to the first circular hole and The contour lines corresponding to the circular holes ; Get the contour line and contour lines The two outer common tangents of ; Get the contour line Tangent to both external common tangent lines First side tangent of intersection ; Get the contour line Tangent to both external common tangent lines Intersecting second side tangent ; Through two external tangent lines , first side tangent , Second side tangent Enclose to form a fitting quadrilateral; The first side tangent and the second side tangent Not related to the 2nd to The contour lines corresponding to the holes intersect.

[0010] Preferably, determining whether the morphology of the strip-shaped holes meets the standards includes: Determine the length of the strip hole With set length Is the absolute value of the difference less than the first threshold? If so, let the length The corresponding weight , otherwise let the length The corresponding weight ; Determine the width of the strip hole With set width Is the absolute value of the difference less than the second threshold? If so, let the width The corresponding weight , otherwise let the width The corresponding weight ; Determine the uniformity of strip holes With setting uniformity Is the absolute value of the difference less than the third threshold If yes, let the uniformity The corresponding weight , otherwise the uniformity The corresponding weight ; Determine the discreteness of the strip hole With set discreteness Is the absolute value of the difference less than the fourth threshold If so, let the discreteness The corresponding weight , otherwise let the discreteness The corresponding weight ; Get the total weight , as shown in Formula 5): 5); According to the sum of weights With setting weights Compare and judge whether the morphology meets the standard, as shown in formula 6): 6).

[0011] Preferably, the uniformity is set ; The third threshold ; Set the discreteness ; The fourth threshold .

[0012] The present application provides a method for measuring and judging the morphology of strip holes, including obtaining the contour line of the strip holes with an image acquisition device, and obtaining the length, width, uniformity and discreteness of the strip holes based on the contour line; judging whether the morphology of the strip holes meets the standards according to the length, width, uniformity and discreteness of the strip holes; the present application constructs quantifiable indicators for the morphological characteristics of the strip holes, which can comprehensively and effectively evaluate the quality level of the strip punching morphology and the stability between different strip holes, and further guide the adjustment of the online strip punching process of heated cigarettes, which is of great significance for improving and stabilizing product quality.

[0013] To sum up, the detection indicators constructed by the determination method provided in this application are intuitive, scientific and strongly related to the punching process. The determination method is simple, efficient and highly operational, filling the gap in quality inspection in the field of strip punching. It is an important technical means to determine the quality of strip punched heated cigarettes and guide the improvement and optimization of the punching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 is the first plan view of the strip-shaped hole to be tested in the embodiment of the present application; Figure 2 is a flow chart of a method for determining a morphology in an embodiment of the present application; Figure 3 is a second plan view of the strip-shaped hole to be tested in the embodiment of the present application; Figure 4 is a third plan view of the strip-shaped hole to be tested in the embodiment of the present application; Figure 5 is a third plan view of the strip-shaped hole to be tested in the embodiment of the present application; Figure 6 It is a flowchart of step S300 in an embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0018] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application 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, and therefore should not be understood as a limitation on the present application.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0020] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0021] like Figure 1 As shown, this embodiment provides a method for measuring and determining the morphology of a strip hole. The strip hole of this embodiment is opened on a cigarette, and the strip hole includes a plurality of strip holes that are opened on the cigarette in sequence along a predetermined direction (for example, the axial direction of the cigarette). The circular holes are arranged on the cigarette, and two adjacent circular holes along a predetermined direction at least partially overlap. The combination of the circular holes forms a nearly rectangular strip hole, in which is a natural number greater than 1, The specific value of is determined according to the actual production parameters. Figure 1 As shown, in actual production, the aperture of the superimposed circular holes may become smaller and smaller due to the influence of various factors.

[0022] like Figure 2 As shown, the determination method of this embodiment includes: Step S100: using an image acquisition device to obtain the contour line of the strip hole, the contour line can reflect the edge contour of the strip hole on a two-dimensional plane.

[0023] After punching the strip hole on the cigarette, the image acquisition device is used to take a photo of the strip hole on the cigarette to obtain a target photo, and the existing algorithm can be directly used to extract the outer contour line of the strip hole in the target photo. In this embodiment, it is preferred to arrange points on the contour edge of the strip hole displayed on the target picture, and the number of points arranged on the edge contour of each circular hole shall not be less than 8. The points on the circular holes are connected in sequence to obtain a closed and approximately rectangular contour line, that is, the contour line of the strip hole in the two-dimensional plane. In this embodiment, when obtaining the contour line, the number of points on the contour of each circular hole is not less than 8, which can effectively improve the accuracy of the obtained contour line and can more accurately feedback the shape of the punched strip hole.

[0024] Step S200, obtaining the length, width, uniformity and discreteness of the strip holes based on the contour line, using existing equipment to obtain the length, width, uniformity and discreteness of the strip holes based on the contour line of the strip holes to reflect the geometric characteristics of the strip holes, which has the advantages of being intuitive and concise.

[0025] In some embodiments, Figure 3 As shown, obtaining the length of the strip hole includes: Get the first circular hole and the The distance between the centers of the circular holes , get the first circular hole and the The radius of the circular hole ; Through the center distance And the radius Get the length of the strip hole, as shown in formula 1): 1); In formula 1), Indicates the length of the strip hole; Indicates the radius of the first circular hole; Indicates In this embodiment, the length of the strip hole can be obtained by adding the center distance of the two farthest circular holes in the strip hole to the radius of the two circles, where the center distance The radii of the two circles can be obtained by measuring the contour lines of the strip holes using existing geometric graphics software.

[0026] In this embodiment, the length of the strip hole is used as one of the evaluation indicators. The indicator is intuitive and concise to measure, easy to implement when using graphic measurement, and can accurately reflect the overall length of the measured strip hole.

[0027] In some embodiments, obtaining the width of the strip-shaped hole includes: First, obtain the actual area of ​​the closed figure formed by the contour line , the area of ​​the closed figure formed by the contour line can be automatically calculated through the existing geometric graphics software, and then the actual area can be obtained ; Then, based on the actual area and the length of the strip hole Get the width of the bar hole , as shown in formula 2): 2); In this embodiment, the actual area of ​​the strip hole With length The ratio of represents the width of the strip hole This indicator does not directly measure the width of the graphic, which avoids the measurement of the trough width at each overlapping circular hole and the peak width of the circular hole diameter, and also avoids the problem of different diameters between different overlapping circular holes, which makes the width of the overlapping circular holes difficult to measure.

[0028] In some embodiments, Figure 4 As shown, obtaining the uniformity of the strip holes includes: First, based on the contour of the strip hole, obtain the largest circular hole diameter in the strip hole and the minimum hole diameter Among them, the existing geometric graphics software has a point set annotation function. The internal algorithm of the geometric graphics software can automatically select the largest and smallest circular holes in the strip hole contour line, and use its mapping function to measure the largest circular hole diameter. and the minimum hole diameter .

[0029] Then, based on and Obtaining the uniformity of strip holes , as shown in formula 3): 3); In this embodiment, the difference between the diameter of the largest circular hole and the diameter of the smallest circular hole forming a single strip hole is used to reflect the uniformity of the width of the strip holes. This indicator makes up for the limitation of using the area method to characterize the width of the strip holes.

[0030] In some embodiments, Figure 5 As shown, obtaining the discreteness of the bar hole includes: First, get the fitted quadrilateral of the contour line, and then get the area of ​​the fitted quadrilateral ; In this embodiment, the area of ​​the fitted quadrilateral is obtained This can be achieved through the closed figure area calculation algorithm provided in the geometry software; In this embodiment, Figure 5 As shown, obtaining the fitting quadrilateral of the contour line includes: The first step is to obtain the contour line corresponding to the first circular hole in the geometry software. and The contour lines corresponding to the circular holes , that is, obtain the contour lines corresponding to the first and last circular holes respectively; The second step is to obtain the contour line and contour lines The two outer common tangents of , two outer tangent lines As the two long sides and two external tangent lines of the fitted quadrilateral respectively They are respectively located on the upper and lower sides of the central axis of the strip hole; The third step is to obtain the contour line Tangent to both external common tangent lines First side tangent of intersection , first side tangent Two external tangent lines Intersecting in a two-dimensional plane, two external tangent lines The first side tangent between As the short side of the fitted quadrilateral, where the first side tangent Located on the contour line Divergence from the contour line One side, also known as the first side tangent Only with contour lines Tangent, only one tangent point, first side tangent It does not intersect with the contour lines corresponding to other circular holes; Get the contour line Tangent to both external common tangent lines Second side tangent line of intersection , the second side tangent Two external tangent lines Intersecting in a two-dimensional plane, two external tangent lines The second side tangent between As the other short side of the fitted quadrilateral, the second side tangent Located on the contour line Divergence from the contour line side, which is the second side tangent Only with contour lines Tangent, only one tangent point, second side tangent It does not intersect with the contour lines corresponding to other circular holes. The fourth step is Figure 5 As shown, through two external tangent lines , first side tangent , Second side tangent Enclose to form a fitting quadrilateral.

[0031] Then, based on the area of ​​the fitted quadrilateral The actual area of ​​the closed figure enclosed by the contour line Get Discreteness , as shown in formula 4): 4).

[0032] In this embodiment, the actual area of ​​the strip hole The area of ​​the fitted quadrilateral that approximates it The ratio is used as one of the evaluation indicators to reflect the degree of discreteness between adjacent circular holes in the strip hole. This indicator can effectively reflect the degree of closeness between the morphology of the strip hole formed by superposition and the morphology of the quadrilateral, which is of great significance for judging the quality of the strip hole morphology.

[0033] Step S300: determining whether the shape of the strip holes meets the standards according to the length, width, uniformity and dispersion of the strip holes.

[0034] like Figure 6 As shown, in this embodiment, whether the morphology of the strip-shaped hole meets the standard is judged by the following rules: Step S310: determine whether the error of each indicator is within the range. If so, give the indicator a weight with actual weight. Otherwise, if not, set the weight corresponding to the indicator to 0. Specifically, as follows: Determine the length of the strip hole With set length Is the absolute value of the difference less than the first threshold? , that is, set the length The length of the strip hole to be measured Take the difference and take the absolute value. If the absolute value is less than the first threshold , it means that it is within the allowable error range. If it is within the allowable error range, then the length The corresponding weight , otherwise let the length The corresponding weight , that is, if it is not within the error range, the weight is configured to 0, so that the total weight of the bar hole can be reduced in the subsequent process, so that the tested bar hole is marked as unqualified; Determine the width of the strip hole With set width Is the absolute value of the difference less than the second threshold? If so, let the width The corresponding weight , otherwise let the width The corresponding weight ; Determine the uniformity of strip holes With setting uniformity Is the absolute value of the difference less than the third threshold If yes, let the uniformity The corresponding weight , otherwise the uniformity The corresponding weight ; Determine the discreteness of the strip hole With set discreteness Is the absolute value of the difference less than the fourth threshold If so, let the discreteness The corresponding weight , otherwise let the discreteness The corresponding weight ; In this embodiment, , , as well as They are all constants that can be adjusted according to actual needs. Different weight values ​​can be assigned to each indicator according to its importance in actual production or other characteristics. For example, assuming that the uniformity and dispersion of the strip holes are more important indicators, the size of each weight value can be selected as: .

[0035] Step S320: After the above judgment, add the weights corresponding to each indicator to obtain the total weight , as shown in Formula 5): 5); Step S330: According to the weight sum With setting weights Compare and judge whether the morphology meets the standard, as shown in formula 6): 6); In formula 6), if the sum of weights Greater than or equal to the set weight , then the shape of the tested strip hole is determined to be up to standard, otherwise, the weight sum Less than the set weight It is determined that the morphology of the tested strip hole does not meet the standard.

[0036] The judgment rules of this embodiment are simple, efficient, and flexible, and the weights can be set according to actual production conditions. And by adjusting each weight value, the probability of misjudgment can be reduced, with high flexibility.

[0037] In some preferred embodiments, the uniformity is set , the third threshold The closer the uniformity is to 0, the smaller the difference between the superimposed round holes of the strip holes, and the more standard the strip holes are. By setting the uniformity to 0, the judgment standard can be strictly controlled, and the allowable floating error is within Within the range of , both production efficiency and quality can be taken into account.

[0038] In some preferred embodiments, the discreteness is set ; The fourth threshold The closer the discreteness is to 1, the closer the strip hole is to a quadrilateral, and the more standard the shape of the strip hole is. By setting the discreteness to 1, the judgment standard can be strictly controlled, and the allowable floating error is within the range of 0.25, which can take into account both production efficiency and quality.

[0039] It should be noted that the geometric graphics software in this embodiment is Analysis application software in the prior art.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for measuring and determining the morphology of strip holes, characterized in that: include: The contour line of the strip hole is obtained by an image acquisition device. The strip hole includes a plurality of strip holes which are sequentially opened along a predetermined direction. circular holes, two adjacent circular holes at least partially overlap; Obtain the length, width, uniformity and dispersion of the strip holes based on the contour line; Whether the shape of the strip holes meets the standards is determined based on the length, width, uniformity and dispersion of the strip holes.

2. The method for measuring and determining the morphology of strip-shaped holes according to claim 1, characterized in that: Obtaining the length of the strip hole includes: Get the first circular hole and the The distance between the centers of the circular holes , get the first circular hole and the The radius of the circular hole ; Through the center distance And the radius Get the length of the strip hole, as shown in formula 1): 1）； In formula 1), Indicates the length of the strip hole; Indicates the radius of the first circular hole; Indicates The radius of the circular hole.

3. The method for measuring and determining the morphology of strip-shaped holes according to claim 2, characterized in that: Obtaining the width of the strip hole includes: Get the actual area of ​​the closed figure enclosed by the contour line ; Based on actual area and the length of the strip hole Get the width of the bar hole , as shown in formula 2): 2）。 4. The method for measuring and determining the morphology of strip-shaped holes according to claim 1, characterized in that: Obtaining the uniformity of the strip-shaped holes includes: Based on the contour of the strip hole, get the largest circular hole diameter in the strip hole and the minimum hole diameter ; based on and Obtaining the uniformity of strip holes , as shown in formula 3): 3）。 5. The method for measuring and determining the morphology of strip-shaped holes according to any one of claims 1 to 4, characterized in that: Obtaining the discreteness of the strip-shaped holes includes: Get the fitted quadrilateral of the contour line, and then get the area of ​​the fitted quadrilateral ; Based on the area of ​​the fitted quadrilateral The actual area of ​​the closed figure enclosed by the contour line Get Discreteness , as shown in formula 4): 4）。 6. The method for measuring and determining the morphology of strip-shaped holes according to claim 5, characterized in that: Obtaining the fitted quadrilateral of the contour line includes: Based on the contour line, obtain the contour line corresponding to the first circular hole and The contour lines corresponding to the circular holes ; Get the contour line and contour lines The two outer common tangents of ; Get the contour line Tangent to both external common tangent lines First side tangent of intersection ; Get the contour line Tangent to both external common tangent lines Intersecting second side tangent ; Through two outer tangent lines , first side tangent , Second side tangent Enclosing to form the fitting quadrilateral; The first side tangent and the second side tangent Not related to the 2nd to The contour lines corresponding to the holes intersect.

7. The method for measuring and determining the morphology of strip-shaped holes according to claim 1, characterized in that: Determining whether the morphology of the strip hole meets the standard includes: Determine the length of the strip hole With set length Is the absolute value of the difference less than the first threshold? If so, let the length The corresponding weight Otherwise, let the length The corresponding weight ; Determine the width of the strip hole With set width Is the absolute value of the difference less than the second threshold? If so, let the width The corresponding weight , otherwise let the width The corresponding weight ; Determine the uniformity of strip holes With setting uniformity Is the absolute value of the difference less than the third threshold? If yes, let the uniformity The corresponding weight , otherwise the uniformity The corresponding weight ; Determine the discreteness of the strip hole With set discreteness Is the absolute value of the difference less than the fourth threshold If so, let the discreteness The corresponding weight , otherwise let the discreteness The corresponding weight ; Get the total weight , as shown in Formula 5): 5）； According to the sum of weights With setting weights Compare and judge whether the morphology meets the standard, as shown in formula 6): 6）。 8. The method for measuring and determining the morphology of strip-shaped holes according to claim 7, characterized in that: The setting uniformity ; The third threshold ; The setting discreteness ; The fourth threshold .

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