Antibacterial plastic packaging film bag-making defective product real-time positioning device based on optical detection

Abstract

The invention relates to an antibacterial plastic packaging film bag-making defective product real-time positioning device based on optical detection, and belongs to the technical field of new material optical detection, the antibacterial plastic packaging film bag-making defective product real-time positioning device is characterized in that a thermal imaging camera is connected above a die head, and the thermal imaging camera is arranged on the inner side of a hollow core rod; the reflection assembly is arranged at the top of the core rod, and the thermal imaging camera identifies a thermal image of a film outside the core rod through the reflection assembly; the processor is in communication connection with the thermal imaging camera, and the processor generates defective product real-time positioning information based on a thermal image; the bar code printer is in communication connection with the processor, and the bar code printer generates a bar code according to the real-time positioning information of the defective product; the technical problems that in the prior art, materials need to be completely spread through the spreading function of equipment, and the real-time positioning precision of defective products in a continuous annular film formed in the film blowing stage cannot be met can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optical detection of new materials, and particularly relates to a real-time positioning device for defective products of antibacterial plastic packaging film bag making based on optical detection. BACKGROUND

[0002] The existing film blowing process adopts single or multiple detection heads arranged in rows to rotate and detect the outer side of the annular film. Such a detection method is based on multiple detection points to form a detection line, and then a surface detection is formed through scanning of the detection line. However, the density of the detection points causes insufficient detection accuracy, and it is difficult to ensure the real-time positioning of defective products. Therefore, the technical personnel in the field need to use a more comprehensive optical detection method to realize real-time positioning of defective products.

[0003] The existing patent with the publication number CN113310988A discloses an optical film surface defect detection equipment and method based on machine vision, which comprises a device shell for hoisting the overall equipment. A belt conveyor is installed on the inner lower wall right side of the device shell, and a rolling shaft penetrates through the front and rear walls of the device shell. A first electric sliding rail is fixedly installed on the inner lower wall left side of the device shell, and a first multi-section hydraulic cylinder is installed on the upper end of the first electric sliding rail.

[0004] The existing technology has the following problems: The flat function of the equipment is needed to completely spread the material, but the continuous annular film formed in the film blowing stage cannot be spread, and the overlapped film cannot be recognized by the camera to identify defects, which cannot meet the real-time positioning accuracy of defective products. SUMMARY

[0005] The application provides a real-time positioning device for defective products of antibacterial plastic packaging film bag making based on optical detection, which can solve the technical problem in the prior art that the flat function of the equipment is needed to completely spread the material, and the real-time positioning accuracy of defective products in the continuous annular film formed in the film blowing stage cannot be met.

[0006] In order to achieve the above purpose, the application realizes the technical scheme as follows: The application provides a real-time positioning device for defective products of antibacterial plastic packaging film bag making based on optical detection, which comprises: A thermal imaging camera is connected above the die head, and the thermal imaging camera is arranged on the inner side of a hollow core rod; A reflection assembly is arranged on the top of the core rod, and the thermal imaging camera identifies the thermal imaging image of the film outside the core rod through the reflection assembly; A processor is in communication connection with the thermal imaging camera, and the processor generates real-time positioning information of defective products based on the thermal imaging image; A barcode printer is communicatively connected to the processor, and the barcode printer generates a barcode based on the real-time positioning information of the defective product.

[0007] By the above technical solution, the heat imaging camera is arranged in the mandrel, and the heat imaging image of the annular film is obtained through the reflection assembly, so that the defect position is comprehensively monitored from the inner side of the annular film, and the real-time positioning of the defect position is realized in combination with the barcode, and the accuracy of real-time positioning of the defective product is improved.

[0008] In the present application, the reflection assembly comprises a distance separation cylinder connected to the top of the mandrel. A first mirror is conical, and the first mirror is connected to the inner top of the distance separation cylinder, and the conical surface of the first mirror is a metal mirror surface. A plurality of collection windows are arranged on the side wall of the reflection assembly, and the first mirror reflects the infrared waves excited by the film to the heat imaging camera through the collection window.

[0009] By the above technical solution, the conical metal mirror surface is adopted to improve the reflection efficiency of the infrared waves and the definition of the heat imaging image, and the defect position is more easily identified.

[0010] In the present application, the reflection assembly comprises a second mirror, which is annular, and the second mirror is connected to the bottom of the distance separation cylinder, and the side of the second mirror facing the heat imaging camera is provided with an inclined surface, and the inclined surface is a metal mirror surface, and the second mirror reflects the heat source of the film to the heat imaging camera through the collection window.

[0011] By the above technical solution, two mirrors are adopted to realize the detection and comparison of annular films with different heights and different temperatures, and the defect misjudgment rate is reduced.

[0012] In the present application, the real-time positioning device further comprises an extension support rod, which is detachably connected to the die.

[0013] By the above technical solution, the extension support rod is adopted to move the heat imaging camera away from the die, so as to reduce the influence of the temperature of the die on the heat imaging camera and improve the running stability of the equipment.

[0014] In the present application, the real-time positioning device has a plurality of extension support rods, and the lengths of the plurality of extension support rods are different.

[0015] By the above technical solution, a plurality of extension support rods with different lengths are adopted to improve the adjustability of the distance of the heat imaging camera under different die temperatures.

[0016] In the present application, the above-mentioned lengthened support rod is formed by splicing a plurality of units end to end, and the length of the lengthened support rod can be adjusted.

[0017] By the above technical solution, the modular splicing unit is adopted, the number of lengthened support rods is reduced, and the selection mode of installation distance is simplified.

[0018] In the present application, the above-mentioned real-time positioning device further comprises: an extension cylinder connected between the die and the reflection assembly, and the distance between the thermal imaging camera and the reflection assembly is adjusted by replacing the extension cylinder with different lengths.

[0019] By the above technical solution, the distance between the thermal imaging camera and the reflection assembly is adjusted by the extension cylinder, and better thermal imaging effect is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Figure 1 The isometric view of the real-time positioning device for defective products of antibacterial plastic packaging film made of bags based on optical detection provided by the embodiment of the present application when connected to the die; Figure 2 The front view of the real-time positioning device for defective products of antibacterial plastic packaging film made of bags based on optical detection provided by the embodiment of the present application when connected to the die; Figure 3 The cross-sectional view of A-A in Figure 2 Figure 4 The cross-sectional view of B-B in Figure 2 Figure 5 The exploded view of the real-time positioning device for defective products of antibacterial plastic packaging film made of bags based on optical detection provided by the embodiment of the present application; Figure 6 The thermal imaging schematic diagram of the product when qualified in the front view; Figure 4 The thermal imaging schematic diagram of the product when unqualified in the front view. Figure 7 Figure 4

[0022] ​​​​Icon: 1 - die; 2 - core rod; 201 - thermal imaging camera; 202 - reflection assembly; 2021 - first mirror; 2022 - second mirror; 2023 - distance separation cylinder; 2024 - acquisition window; 2025 - adapter tube; 2026 - back pull screw; 203 - extension cylinder; 204 - extension support rod; 205 - support seat; 3 - feeding pipe. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described in detail below with reference to the drawings.

[0024] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0025] The terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0026] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be welding, or bolted connection, or riveting; it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Example 1: Please refer to Figures 1 to 7 , Figures 1 to 7 An embodiment of the present application is shown.

[0028] The present embodiment provides a real-time positioning device for defect products of antibacterial plastic packaging film bag making based on optical detection, which comprises: The thermal imaging camera 201 is connected above the die head 1, and the thermal imaging camera 201 is arranged inside the hollow core rod 2. The thermal imaging camera 201 is selected according to the bubble diameter of the film blowing device, the melting temperature variation range of the raw material, and the inner diameter of the core rod 2. Those skilled in the art can select the appropriate model or brand through public channels. The technical improvement point of the embodiment is not the thermal imaging camera 201 itself, but the synergy generated by the setting position of the thermal imaging camera 201. As shown in Figures 1 to 3 , the reflection assembly 202 is arranged at the top of the core rod 2, and the thermal imaging camera 201 identifies the thermal imaging image of the film outside the core rod 2 through the reflection assembly 202. As shown in Figure 6 and Figure 7 , the processor is in communication connection with the thermal imaging camera 201, and the processor generates real-time positioning information of defective products based on the thermal imaging image. The bar code printer is in communication connection with the processor, and the bar code printer generates a bar code of the real-time positioning information of the defective products.

[0029] In use, the extruder is connected through the feeding pipe 3, the molten PE inorganic antibacterial master batch enters the die head 1, and the bubble is pulled out through the upper discharge ring. After the stable annular film is formed (the existing process, which will not be further described here), detection is performed. As shown in Figure 6 , the infrared wave of the film reflected by the inclined surface and the conical surface is imaged by the thermal imaging camera 201, and then it is determined whether there is a defective product through the processor, Figure 6 When there is no defect, the thermal imaging image gradually cools down as the film gradually moves away from the die head 1. When there is a defect, it will be as shown in Figure 7 When it just comes out of the die head 1, the defect point does not appear or does not produce obvious temperature difference, and the temperature change of the outer ring is relatively uniform. After being cooled by the cooling air ring of the film blowing device, the defective product appears as a yellow bright spot (caused by the accumulation of metal oxide particles in the PE inorganic antibacterial master batch, etc.) or a blue bright spot (caused by the local temperature drop due to the thinning or hole of the cooled film).

[0030] It should be noted that the principle of traditional infrared light thickness measurement is to calculate the thickness by the correlation between infrared light penetration / reflection intensity and film thickness. However, in the PE inorganic antibacterial master batch film blowing scene, the defects of this technology are concentrated in signal interference, dynamic deviation and detection blind area. The "material source signal interference" caused by inorganic antibacterial agent. PE inorganic antibacterial master batch usually contains silver (Ag2O), zinc (ZnO), copper (Cu2O) and other metal oxide fillers. There is an essential difference between such inorganic particles and pure PE resin in the effect of infrared light: Reflection / scattering interference: the infrared reflectivity of metal oxide is much higher than PE (PE mainly absorbs mid-infrared light, and inorganic particles mainly reflect / scatter), which causes the "effective signal" received by the infrared probe to be overwhelmed by the stray light of the particles. For example: in the same thickness, the area with a higher concentration of antibacterial master batch will be misjudged as "film thickness is too thin" (transmission method) or "film thickness is too thick" (reflection method) due to enhanced particle reflection. The cumulative error of uneven concentration: during the blowing process, the antibacterial master batch may form "local agglomeration" (micron-sized particle clusters) due to poor dispersion. The sudden change in infrared signal in the agglomeration area is difficult to distinguish from the "true thickness deviation", causing the linear relationship between the measured thickness data and the actual thickness to break down; the processor and the barcode printer are specific manifestations of the real-time positioning of the technical solution of the present embodiment, but as long as they can meet the final technical effect, those skilled in the art can purchase existing equipment through public channels for use. In the present embodiment, the necessary parts for achieving the corresponding technical effect are the specific settings of the thermal imaging camera 201 and the infrared waves of the reflective annular film.

[0031] Through the above technical solution, the thermal imaging camera 201 is built-in in the mandrel 2, and the thermal imaging image of the annular film is obtained through the reflection assembly 202, thereby realizing comprehensive monitoring of the defect position from the inside of the annular film. Combined with the real-time positioning of the defect product position by the barcode, the accuracy of real-time positioning of the defect product is improved.

[0032] As a more preferred embodiment, as shown in Figure 3 The reflection assembly 202 includes a distance separating cylinder 2023 connected to the top of the mandrel 2. A first reflector 2021 in the shape of a cone is connected to the inner top of the distance separating cylinder 2023. The conical surface of the first reflector 2021 is a metal mirror surface. The reflectivity of the metal mirror surface (such as aluminum, stainless steel, gold / silver plated mirror surface) to long-wave infrared is usually up to 80%-95%, almost no absorption of infrared radiation, and can efficiently reflect the infrared signal of the target, which is an ideal carrier for thermal imaging reflection. As shown in Figure 3 and Figure 5 A plurality of collection windows 2024 are provided on the side wall of the reflection assembly 202. The first reflector 2021 reflects the infrared waves excited by the film to the thermal imaging camera 201 through the collection windows 2024. The adjacent side walls of the collection windows 2024 should be thin enough to reduce the blind area of thermal imaging under the condition of meeting the supportability. At the position of the side wall shielding, as shown in Figure 7As shown, the thermal imaging distribution of the defect point will not present a linear distribution, but a reflection distribution, so even if the side wall causes partial loss, the thermal imaging collected can be completed by the processor, and the specific completion method can refer to the intelligent picture completion function of PS. The completion method is an existing function of a specific graphics processing software, which is not within the protection scope of the present application and will not be further described and limited.

[0033] By the above technical solution, the cone-shaped metal mirror is adopted to improve the reflection efficiency of infrared waves and the definition of the thermal imaging diagram, and the defect position is more easily identified.

[0034] As a preferred embodiment, as shown in the drawings, Figures 3 to 5 The above-mentioned reflection assembly 202 includes a second mirror 2022 in the form of a ring, which is connected to the bottom of the distance cylinder 2023. The second mirror 2022 is provided with a slope on the side facing the thermal imaging camera 201, and the slope is a metal mirror. The second mirror 2022 reflects the heat source of the film to the thermal imaging camera 201 through the collection window 2024.

[0035] By the above technical solution, two mirrors are adopted to realize the detection and comparison of the annular film with different heights and temperatures, and the defect misjudgment rate is reduced.

[0036] As a preferred embodiment, the above-mentioned real-time positioning device further includes an extension support rod 204, which is detachably connected to the die 1.

[0037] By the above technical solution, the extension support rod 204 is adopted to move the thermal imaging camera 201 away from the die 1, reduce the influence of the temperature of the die 1 on the thermal imaging camera 201, and improve the running stability of the equipment.

[0038] As a preferred embodiment, the above-mentioned real-time positioning device has a plurality of extension support rods 204 with different lengths. During manufacturing, a plurality of extension support rods 204 with different lengths are prefabricated according to the parameters of the specific film blowing equipment to replace the film produced by different raw materials with different parameters.

[0039] By the above technical solution, a plurality of extension support rods 204 with different lengths are adopted to improve the adjustability of the distance of the thermal imaging camera 201 under different temperatures of the die 1.

[0040] As a preferred embodiment, the real-time positioning device further comprises an extension cylinder 203 connected between the die head 1 and the reflection assembly 202, and the distance between the thermal imaging camera 201 and the reflection assembly 202 is adjusted by replacing the extension cylinder 203 with different lengths, and different lengths of the extension cylinder 203 are replaced according to the specific parameters of the selected thermal imaging camera 201 and the different lengths of the extension support rod 204 during manufacturing.

[0041] It should be noted that the device is a customized device, and the universality and the like are not considered unless otherwise specified.

[0042] Through the above technical solution, the distance between the thermal imaging camera 201 and the reflection assembly 202 is adjusted by the extension cylinder 203, and better thermal imaging effect has been obtained.

[0043] Embodiment 2: The embodiment provides a real-time positioning device for antibacterial plastic packaging film bag making defect products based on optical detection, which is substantially the same as embodiment 1, except that the extension support rod 204 is a plurality of units that can be connected end to end, and the length of the extension support rod 204 can be adjusted.

[0044] The end-to-end unit first satisfies the threading hole in the inside of the extension support rod 204 as shown in Figure 3 Then the units are spliced by thread connection, and the specific connection mode of the thermal imaging camera 201 and the extension support rod 204 can be set according to the adapter of the thermal imaging camera 201 after purchase by those skilled in the art, and the specific connection mode does not affect the realization of the technical effect, so it is not further described and limited here.

[0045] Through the above technical solution, the modular splicing unit is used, the number of extension support rods 204 is reduced, and the selection mode of the installation distance is simplified.

[0046] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A device for real-time positioning of defective bags in antibacterial plastic packaging film bagging based on optical detection, characterized in that, The application relates to a hot film defect real-time positioning device for a film blowing machine, which comprises the following parts: a thermal imaging camera (201) connected to the top of a die head (1), wherein the thermal imaging camera (201) is arranged inside a hollow core rod (2); a reflection assembly (202) arranged on the top of the core rod (2), wherein the thermal imaging camera (201) identifies a thermal imaging image of a film outside the core rod (2) through the reflection assembly (202); a processor in communication connection with the thermal imaging camera (201), wherein the processor generates real-time positioning information of a defective product based on the thermal imaging image; a barcode printer in communication connection with the processor, wherein the barcode printer generates a barcode of the real-time positioning information of the defective product.

2. The real time locating device for bagging defects of antibacterial plastic packaging film based on optical detection according to claim 1, characterized in that, The reflection assembly (202) comprises a distance separating cylinder (2023) connected to the top of the core rod (2); a first reflecting mirror (2021) in a conical shape, wherein the first reflecting mirror (2021) is connected to the inner top of the distance separating cylinder (2023), and the conical surface of the first reflecting mirror (2021) is a metal mirror surface; a plurality of collecting windows (2024) arranged on the side wall of the reflection assembly (202), wherein the first reflecting mirror (2021) reflects infrared waves excited by the film to the thermal imaging camera (201) through the collecting windows (2024).

3. The real time locating device for bagging defects of antibacterial plastic packaging film based on optical detection according to claim 2, characterized in that, The reflection assembly (202) comprises: a second reflecting mirror (2022) in a ring shape, wherein the second reflecting mirror (2022) is connected to the bottom of the distance separating cylinder (2023), and the side of the second reflecting mirror (2022) facing the thermal imaging camera (201) is provided with an inclined surface, and the inclined surface is a metal mirror surface; the second reflecting mirror (2022) reflects heat sources of the film to the thermal imaging camera (201) through the collecting windows (2024).

4. The real time locating device for bagging defects of antibacterial plastic packaging film based on optical detection according to claim 3, characterized in that, Further comprising: an extended supporting rod (204) detachably connected to the die head (1).

5. The real time locating device for bagging defects of antibacterial plastic packaging film based on optical detection according to claim 4, characterized in that, A plurality of extended supporting rods (204) with different lengths.

6. The real time locating device for bagging defects of antibacterial plastic packaging film based on optical detection according to claim 4, characterized in that, The extended supporting rod (204) is composed of a plurality of units connected in a head-to-tail mode, and the length of the extended supporting rod (204) can be adjusted.

7. The apparatus for real-time locating of defective bags of an antibacterial plastic packaging film made by bagging according to any one of claims 5 or 6, characterized in that, Further comprising: an extended cylinder (203) connected between the die head (1) and the reflection assembly (202), wherein the distance between the thermal imaging camera (201) and the reflection assembly (202) is adjusted by replacing the extended cylinder (203) with different lengths.

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