Package foreign matter detection system

Abstract

The embodiment of the utility model provides a packaging foreign matter detection system which comprises a conveying unit used for conveying a packaging body, a first identification line and a second identification line are arranged on the outer surface of a sealing part of the packaging body, and a conveying assembly comprises a first conveying assembly and a second conveying assembly, the first conveying assembly comprises a first conveying belt with a first conveying surface, the second conveying assembly comprises a second conveying belt with a second conveying surface, the second conveying surface supports the main body part, and the sealing part is attached to the first conveying surface; the image acquisition unit is configured to acquire images of the first identification line and the second identification line through an image acquisition device, acquire maximum curvatures of the first identification line and the second identification line and compare the maximum curvatures with a threshold value so as to judge that the sealing part contains foreign matters; through the arrangement, foreign matters or badness of the pillow packaging body at the packaging seal can be easily detected, meanwhile, the mode can adapt to different packaging materials, the speed is high, and the efficiency is high.

Description

Technical Field

[0001] The utility model relates to a packaging foreign body detection system. Background Art

[0002] Liquid foods such as milk and beverages are usually filled in packaging bodies formed by multi-layer composite packaging materials. When thinner or lower-stiffness multi-layer composite packaging materials are used for packaging, the packaging bodies formed are usually pillow-shaped, also known as Tetra Pak bags or Tetra Pak pillows.

[0003] During packaging, the packaging material is usually formed into a bag, which is then filled and sealed to form a pillow-shaped package. However, during the sealing process, foreign matter may enter the sealing area, or unexpected sealing defects may occur. In particular, for Bailibao products formed from relatively thin composite materials with multiple layers of polyolefins, unexpected foreign matter or sealing defects may occur during the hot-melt sealing due to excessively high or low hot-melt temperatures. Conventional detection methods only detect defects caused by breaks or excessive hot-melt, and cannot detect foreign matter or sealing defects sandwiched between the seals.

[0004] Therefore, it is necessary to develop and implement a solution to solve the above technical problems. Utility Model Content

[0005] To this end, the present invention provides a packaging foreign body detection system to solve the above technical problems.

[0006] A packaging foreign body detection system, comprising:

[0007] A conveying unit for conveying a packaging body having a main body and a sealing portion, wherein the sealing portion includes an outer surface provided with a plurality of first identification lines arranged at equal intervals and a plurality of second identification lines perpendicular to the first identification lines and arranged at equal intervals, the conveying unit including a first conveying assembly and a second conveying assembly, wherein the first conveying assembly includes a first conveyor belt having a first conveying surface, the second conveying assembly includes a second conveyor belt having a second conveying surface, the first conveyor belt and the second conveyor belt move synchronously, the first conveying surface is located above the second conveying surface, and the second conveying surface supports the main body, and the sealing portion is attached to the first conveying surface;

[0008] The image acquisition unit includes an image acquisition device located above the first conveying surface, and the image acquisition unit is configured to acquire images of the first identification line and the second identification line and acquire the maximum curvatures of the first identification line and the second identification line through the image acquisition device. If the maximum curvature of at least one first identification line is greater than a threshold value and / or the maximum curvature of at least one second identification line is greater than a threshold value, it is determined that foreign matter is contained in the sealing portion.

[0009] Wherein, in the horizontal direction, the first conveying surface and the second conveying surface are arranged side by side.

[0010] Wherein, the distance between the first conveying surface and the second conveying surface in the vertical direction is adjustable.

[0011] Among them, an adsorption device is also provided under the first conveying surface 1130, and the adsorption device includes a first suction box. The first suction box is connected to a negative pressure device, and the first suction box includes a first suction port facing the first conveying surface.

[0012] Wherein, the first conveyor belt includes a plurality of mesh holes, and the aperture of the mesh holes is less than 0.2 mm.

[0013] Among them, the first conveying assembly includes a first bracket and a first driving wheel and a first front supporting wheel arranged on the first bracket. The first conveyor belt is wound around the first driving wheel and the first front supporting wheel. One end of the first bracket is pivotally connected to the frame, and the other end is adjustably connected to the frame through a first adjusting rod. The length of the first adjusting rod is adjustable.

[0014] In which, the second conveying assembly includes a second bracket and a second driving wheel and a second front supporting wheel arranged on the second bracket, the second conveyor belt is wound around the second driving wheel and the second front supporting wheel, one end of the second bracket is pivotally connected to the frame, and the other end is adjustably connected to the frame through a second adjusting rod, the length of the second adjusting rod is adjustable, the first bracket is configured to rotate around the rotation axis of the first driving wheel, and the second bracket is configured to rotate around the rotation axis of the second driving wheel.

[0015] The spacing between the first marking lines is equal to the spacing between the second marking lines.

[0016] Wherein, the line width of the first identification line and the second identification line is 0.01mm-0.2mm.

[0017] The width between adjacent first identification lines is 2 to 15 mm, and the width between adjacent second identification lines is 2 to 15 mm.

[0018] Beneficial effects: The embodiment of the present invention provides a packaging foreign body detection system, comprising a conveying unit for conveying a packaging body having a main body and a sealing portion, wherein the sealing portion comprises an outer surface, and the outer surface is provided with a plurality of first identification lines arranged at equal intervals and a plurality of second identification lines perpendicular to the first identification lines and arranged at equal intervals, the conveying unit comprises a first conveying assembly and a second conveying assembly, wherein the first conveying assembly comprises a first conveyor belt having a first conveying surface, the second conveying assembly comprises a second conveyor belt having a second conveying surface, the first conveyor belt and the second conveyor belt move synchronously, the first conveying surface is located above the second conveying surface, and The second conveying surface supports the main body, and the sealing part is attached to the first conveying surface; the image acquisition unit includes an image acquisition device located above the first conveying surface, and the image acquisition unit is configured to obtain images of the first identification line and the second identification line and obtain the maximum curvature of the first identification line and the second identification line through the image acquisition device. If the maximum curvature of at least one first identification line is greater than a threshold value and / or the maximum curvature of at least one second identification line is greater than a threshold value, it is determined that foreign matter is contained in the sealing part. Through the above-mentioned arrangement, foreign matter or defects at the packaging sealing part of the pillow packaging body can be easily detected. At the same time, this method can adapt to different packaging materials, is fast, and has high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of a packaging foreign body detection system according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 The simplified schematic diagram of the packaging foreign body detection system from the left side is shown in FIG.

[0021] Figure 3 is a first identification line and a schematic diagram of the first identification line;

[0022] Figure 4 This is a schematic diagram of a foreign object being caught in the seal.

[0023] Figure 5 Schematic diagram of the image acquisition unit;

[0024] Description of components in the picture:

[0025] First conveying assembly 11; first driving wheel 111; first front supporting roller 112; first conveyor belt 113; first conveying surface 1130; first bracket 114; first adjusting rod 115; first suction box 116; first interface 1161; second conveying assembly 12; second driving wheel 121; second front supporting roller 122; second conveyor belt 123; second conveying surface 1230; second bracket 124; second adjusting rod 125; second suction box 126; second interface 1261; image acquisition device 21; packaging body 30; packaging sheet 301; main body 31; sealing portion 32; first identification line 321; second identification line 322. DETAILED DESCRIPTION

[0026] In the following description, terms such as "upper," "lower," "inner," "outer," and "top / bottom" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Please refer to Figure 1-Figure 5 An embodiment of the present invention provides a packaging foreign body detection system for detecting foreign objects or defects at the sealing portion of a packaging body 30 formed by packaging materials. The packaging body 30 is generally pillow-shaped, having a main body portion for accommodating products and a closed main body portion so that the packaging body 30 forms a sealed sealing portion 32. The packaging foreign body detection system includes a conveying unit and an image acquisition unit.

[0028] The sealing portion 32 is formed by combining two pieces of packaging sheets 301. The combination refers to the connection of the combined materials to form a whole. Usually, it can be formed by hot melting. The hot melting can be achieved by heating the material itself to reach the melting point, locally melting it, and solidifying it to form a connection, or by applying external energy such as ultrasound to the material to cause the material to locally melt at high temperature and solidify it to form a connection. It can be understood that the packaging sheet 301 is a part of the packaging material.

[0029] In this embodiment, the packaging material includes at least two layers, more specifically, at least an inner layer and an outer layer formed of a hot-melt resin, and the sealing portion 32 is formed by combining the inner layer or combining the inner layer and the outer layer.

[0030] In a specific embodiment, the hot-melt resin is an olefin resin such as polyethylene and polypropylene, and more specifically includes low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, high-density polyethylene, medium-density polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethyl acrylate copolymer and other resins, which can also be used in appropriate combinations. Preferably, the inner layer and outer layer are mainly polyethylene.

[0031] In some other embodiments, a base layer may be further provided between the inner layer and the outer layer. Typically, the base layer has a greater stiffness so that the packaging body 30 can form a fixed shape or maintain a fixed shape.

[0032] Specifically, the base layer is a paper layer, and the paper layer can be natural paper, synthetic paper or mixed paper. The natural paper refers to paper formed by wet-laid web forming using natural fibers, the synthetic paper refers to paper formed by wet-laid web forming using synthetic fibers, dry-laid web forming using spunlace or needle punching, and the mixed paper refers to paper formed by wet-laid web forming using natural fibers and synthetic fibers, dry-laid web forming using spunlace or needle punching. It can be understood that the natural fiber can be at least one of wood pulp fiber, bamboo fiber, straw pulp fiber, sugarcane pulp fiber and cotton pulp fiber.

[0033] In addition, the paper layer may also be a multi-layer laminated structure, including 2, 3, or 4 fiber-containing layers, and may further include a coating layer. In a specific embodiment, the paper layer includes a coating layer, a surface layer, a core layer, and a bottom layer.

[0034] In addition, a metal or metal oxide coating may be provided between the outer layer and the base layer or between the base layer and the inner layer to further block oxygen and water vapor. At the same time, the metal or metal oxide coating is used to block light.

[0035] When the coating is a metal or a metal oxide, the metal may be copper, aluminum, titanium, chromium, etc., and the oxide may be aluminum oxide, copper oxide, titanium oxide, chromium oxide, etc.

[0036] A plurality of first identification lines 321 arranged at equal intervals and a plurality of second identification lines 322 perpendicular to the first identification lines 321 and arranged at equal intervals are further provided on the outer surface of the formed sealing portion 32 .

[0037] More specifically, the first identification lines 321 are arranged parallel to the conveying direction, and the second identification lines 322 are perpendicular to the first identification lines 321 . The first identification lines 321 and the second identification lines 322 are arranged in a grid shape.

[0038] Furthermore, the spacing between the first marking lines 321 is equal to the spacing between the second marking lines 322 , so that the grid formed by the first marking lines 321 and the second marking lines 322 is a square.

[0039] Furthermore, the line widths of the first identification line 321 and the second identification line 322 are equal. At the same time, the widths of the first identification line 321 and the second identification line 322 cannot be too large or too small. When the first identification line 321 and the second identification line 322 are too wide, they are difficult to distinguish when a small deformation occurs. When the first identification line 321 and the second identification line 322 are too narrow, it will be difficult to distinguish the first identification line 321 and the second identification line 322 in subsequent image recognition.

[0040] Furthermore, the line width of the first identification line 321 and the second identification line 322 is 0.01 mm to 0.2 mm.

[0041] Furthermore, the colors of the first identification line 321 and the second identification line 322 are black or red. Specifically, when the first identification line 321 and the second identification line 322 are black, the RGB values ​​of the first identification line 321 and the second identification line 322 are 0, 0, 0. When the first identification line 321 and the second identification line 322 are red, the RGB values ​​of the first identification line 321 and the second identification line 322 are 255, 0, 0.

[0042] Furthermore, the width between adjacent first identification lines 321 is 2 to 15 mm. Similarly, the width between adjacent second identification lines 322 is 2 to 15 mm.

[0043] It is understandable that the first identification line 321 and the second identification line 322 can be realized by printing on the outer layer.

[0044] The conveying unit includes a first conveying component 11 and a second conveying component, wherein the first conveying component 11 includes a first conveying belt 113 having a first conveying surface 1130, and the second conveying component includes a second conveying belt 123 having a second conveying surface 1230. The first conveying belt 113 and the second conveying belt 123 move synchronously, the first conveying surface 1130 is located above the second conveying surface 1230, and the second conveying surface 1230 supports the main body 31, and the sealing part 32 is attached to the first conveying surface 1130.

[0045] Specifically, the first conveying assembly 11 includes a first bracket 114 and a first driving wheel 111 and a first front supporting wheel 112 arranged on the first bracket 114. The first conveyor belt 113 is wound around the first driving wheel 111 and the first front supporting wheel 112, and moves under the drive of the first driving wheel 111. The first conveying surface 1130 is the upper side of the first conveyor belt 113, which is used to support the sealing part 32.

[0046] The second conveying assembly includes a second bracket 124 and a second driving wheel 121 and a second front supporting wheel 122 arranged on the second bracket 124. The second conveyor belt 123 is wound around the second driving wheel 121 and the second front supporting wheel 122, and moves under the drive of the second driving wheel 121. The second conveying surface 1230 is the upper side of the second conveyor belt 123, which is used to support the main body 31.

[0047] At the same time, in the horizontal direction, the first conveying surface 1130 and the second conveying surface 1230 are arranged side by side, so that the main body 31 and the sealing part 32 of the packaging body 30 are respectively located on the second conveying surface 1230 and the first conveying surface 1130, that is, the main body 31 and the sealing part 32 of the same packaging body 30 are supported by the second conveying surface 1230 and the first conveying surface 1130 respectively. The parallel arrangement means that the first conveying surface 1130 and the second conveying surface 1230 are parallel in the horizontal direction.

[0048] At the same time, in the vertical direction, the height of the first conveying surface 1130 is greater than the height of the second conveying surface 1230, so that the first conveying surface 1130 is located above the second conveying surface 1230, so that when the main body 31 is located on the second conveying surface 1230, the sealing part 32 can be located in a flat state on the first conveying surface 1130.

[0049] It can be understood that an adsorption device is also provided under the first conveying surface 1130 to make the sealing part 32 adhere to the first conveying surface 1130. At the same time, the adsorption of the adsorption device can make the sealing part 32 appear flat, so that the image acquisition device 21 can capture a suitable image.

[0050] Furthermore, the first conveying surface 1130 should be a flat surface so that the sealing portion 32 attached to the first conveying surface 1130 can be more flat.

[0051] Furthermore, the first conveyor belt 113 includes a plurality of mesh holes so that the adsorption device located below the first conveying surface 1130 can produce an adsorption effect on the sealing portion 32. The aperture of the mesh holes should be smaller than the size of the grid. Preferably, the aperture of the mesh holes is less than 0.2 mm, and more preferably, the aperture of the mesh holes is 0.02 mm to 0.15 mm.

[0052] Furthermore, the adsorption device includes a first suction box 116, which is connected to a negative pressure device through a first interface 1161, thereby forming a negative pressure in the first suction box 116, and the first suction box 116 includes a first suction port facing the first conveying surface 1130, and an adsorption effect is formed on the first conveying surface 1130 through the first suction port.

[0053] Furthermore, an adsorption device is also provided below the second conveying surface 1230. The adsorption device below the second conveying surface 1230 includes a second suction box 126. The second suction box 126 is connected to the negative pressure device through a second interface 1261, and the second suction box 126 includes a second suction port facing the second conveying surface 1230, and an adsorption effect is formed on the second conveying surface 1230 through the second suction port.

[0054] Furthermore, the vertical spacing between the first conveying surface 1130 and the second conveying surface 1230 is adjustable. Specifically, in this embodiment, one end of the first bracket 114 is pivotally connected to the frame, and the other end is adjustably connected to the frame through the first adjusting rod 115. The length of the first adjusting rod 115 is adjustable. By adjusting the length of the first adjusting rod 115, the angle of one end of the first bracket 114 is changed, thereby adjusting the position of the first conveying surface 1130. Similarly, one end of the second bracket 124 is pivotally connected to the frame, and the other end is adjustably connected to the frame through the second adjusting rod 125. The length of the second adjusting rod 125 is adjustable. By adjusting the length of the second adjusting rod 125, the angle of one end of the second bracket 124 is changed, thereby adjusting the position of the second conveying surface 1230. It can be understood that adjusting the positions of the first conveying surface 1130 and the second conveying surface 1230 can adapt to different packaging bodies 30 and enable the image acquisition device 21 to more accurately obtain image information of the first identification line 321 and the second identification line 322.

[0055] Furthermore, the first bracket 114 is configured to rotate around the rotation axis of the first driving wheel 111 , and the second bracket 124 is configured to rotate around the rotation axis of the second driving wheel 121 .

[0056] Furthermore, the first driving wheel 111 and the second driving wheel 121 are arranged back to back.

[0057] The image acquisition unit includes an image acquisition device 21 located above the first conveying surface 1130, and the image acquisition unit is configured to acquire images of the first identification line 321 and the second identification line 322 and acquire the maximum curvatures of the first identification line 321 and the second identification line 322 through the image acquisition device 21. If the maximum curvature of at least one first identification line 321 is greater than a threshold value and / or the maximum curvature of at least one second identification line 322 is greater than a threshold value, it is determined that foreign matter is contained in the sealing portion 32.

[0058] It is understandable that the image acquisition unit may further include components such as a light source, which will not be described in detail here.

[0059] The image acquisition device 21 is used to obtain optical image information of the first marking line 321 and the second marking line 322. Specifically, the image acquisition device 21 includes an image sensor, which can convert the optical image information obtained by the lens into image information of an electrical signal, thereby obtaining the curvature of the first marking line 321 and the curvature between the second marking lines 322. The image sensor can be a complementary metal oxide semiconductor (CMOS) sensor or a charge-coupled device (CCD) sensor, etc. At the same time, the image sensor should have a resolution of more than 2 million pixels.

[0060] Please refer to Figure 4 When there is a foreign object or a poor bonding between the two combined packaging sheets 301, the packaging sheet 301 located on the upper side of the bonding area will appear in a convex state at the corresponding position, and the shape of the convexity corresponds to the shape of the foreign object or the shape of the poor bonding. At the same time, when a foreign object or a poor bonding occurs, the first identification line 321 or the second identification line 322 on the outer surface will change, and the shape of the first identification line 321 and the second identification line 322 when forming a plane will change, that is, the first identification line 321 or the second identification line 322 will be bent, and the curvature of the first identification line 321 and the second identification line 322 after bending and deformation is related to the size of the foreign object. At the same time, the maximum curvature is formed at the protruding position where the foreign object is formed, that is, when the maximum curvature of at least one first identification line 321 is greater than the threshold value and / or the maximum curvature of at least one second identification line 322 is greater than the threshold value, it can be judged that there is a foreign object or a poor bonding.

[0061] Furthermore, the curvature is the maximum curvature after the first marking line 321 and the second marking line 322 are bent and deformed.

[0062] Furthermore, the curvature should be greater than or equal to 1, that is, the threshold is 1. In other embodiments, the threshold can be 2, 3, 4 or greater, but the threshold should be less than or equal to 80 to eliminate unexpected wrinkles on the packaging sheet 301.

[0063] In another embodiment, the curvature of the first identification line 321 or the second identification line 322 after the foreign matter or defective protrusion is formed can be statistically analyzed through manual inspection, and a threshold value can be determined based on the statistical value to more accurately identify the foreign matter. The above description is only an embodiment of the present invention and does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, is also included in the scope of patent protection of the present invention.

Claims

1. A packaging foreign body detection system, characterized in that: include, A conveying unit for conveying a packaging body having a main body and a sealing portion, wherein the sealing portion includes an outer surface provided with a plurality of first identification lines arranged at equal intervals and a plurality of second identification lines perpendicular to the first identification lines and arranged at equal intervals, the conveying unit including a first conveying assembly and a second conveying assembly, wherein the first conveying assembly includes a first conveyor belt having a first conveying surface, the second conveying assembly includes a second conveyor belt having a second conveying surface, the first conveyor belt and the second conveyor belt move synchronously, the first conveying surface is located above the second conveying surface, and the second conveying surface supports the main body, and the sealing portion is attached to the first conveying surface; The image acquisition unit includes an image acquisition device located above the first conveying surface, and the image acquisition unit is configured to acquire images of the first identification line and the second identification line and acquire the maximum curvatures of the first identification line and the second identification line through the image acquisition device. If the maximum curvature of at least one first identification line is greater than a threshold value and / or the maximum curvature of at least one second identification line is greater than a threshold value, it is determined that foreign matter is contained in the sealing portion.

2. The packaging foreign body detection system according to claim 1, characterized in that: In the horizontal direction, the first conveying surface and the second conveying surface are arranged side by side.

3. The packaging foreign body detection system according to claim 2, characterized in that: The distance between the first conveying surface and the second conveying surface in the vertical direction is adjustable.

4. The packaging foreign body detection system according to claim 3, characterized in that: An adsorption device is further provided below the first conveying surface. The adsorption device includes a first suction box. The first suction box is connected to a negative pressure device. The first suction box includes a first suction port facing the first conveying surface.

5. The packaging foreign body detection system according to claim 4, characterized in that: The first conveyor belt includes a plurality of meshes, and the aperture of the meshes is less than 0.2 mm.

6. The packaging foreign body detection system according to claim 4, characterized in that: The first conveying assembly includes a first bracket and a first driving wheel and a first front supporting wheel arranged on the first bracket. The first conveyor belt is wound around the first driving wheel and the first front supporting wheel. One end of the first bracket is pivotally connected to the frame, and the other end is adjustably connected to the frame through a first adjusting rod. The length of the first adjusting rod is adjustable.

7. The packaging foreign body detection system according to claim 6, characterized in that: The second conveying assembly includes a second bracket and a second driving wheel and a second front supporting wheel arranged on the second bracket. The second conveyor belt is wound around the second driving wheel and the second front supporting wheel. One end of the second bracket is pivotally connected to the frame, and the other end is adjustably connected to the frame through a second adjusting rod. The length of the second adjusting rod is adjustable. The first bracket is configured to rotate around the rotation axis of the first driving wheel, and the second bracket is configured to rotate around the rotation axis of the second driving wheel.

8. The packaging foreign body detection system according to claim 1, wherein: The spacing between adjacent first identification lines is equal to the spacing between adjacent second identification lines.

9. The packaging foreign body detection system according to claim 8, characterized in that: The line width of the first identification line and the second identification line is 0.01mm to 0.2mm.

10. The packaging foreign matter detection system according to claim 9, characterized in that: The width between adjacent first identification lines is 2 to 15 mm, and the width between adjacent second identification lines is 2 to 15 mm.

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