Visual inspection system and method for defects of packaging bag
By using a visual inspection system and a tic-tac-toe structure to detect the shape and thickness deviation of packaging bags, the problem of defects in packaging bag production is solved, product quality and production efficiency are improved, and maintenance costs are reduced.
Patent Information
- Application Number
- CN202510932643.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-07
- Publication Date
- 2025-10-03
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
During the production process, packaging bags often have uneven cutting lines, warping after heat sealing, bubbles in the heat-sealed area, or surface unevenness defects, which affect the quality and appearance and even lead to product damage and waste.
A visual inspection system is used, with industrial cameras and graphics processors used for 3D modeling. A conveyor belt, horizontal and vertical comparison rods are combined to form a tic-tac-toe structure to detect the external dimensions and thickness deviation of the packaging bags. The thickness is measured by a laser sensor to eliminate defective products.
It achieves efficient detection of shape and thickness defects of packaging bags, improves product quality, reduces waste, adapts to the detection needs of various sizes and reduces maintenance costs.
Smart Images
Figure CN120741471A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of packaging bag production inspection, and in particular to a packaging bag defect visual inspection system and method. Background Art
[0002] Packaging bags are widely used items in industrial production and daily life. They can provide important packaging and protection functions for various products. The production of packaging bags is a complex process that requires many different processes and technologies. For example, the printing process can print various patterns, texts and trademarks on the packaging bags. The cutting process can cut the printed materials into the required shape and size. The splicing process can splice different materials together to form a complete packaging bag. The coating process can apply a layer of material to the surface of the packaging bag to improve the strength, waterproofness, moisture resistance and other properties of the packaging bag. The laminating process can bond two materials together to make multi-layer composite materials.
[0003] However, various defects often occur during the production of packaging bags. For example, uneven cutting lines lead to edge dimensions that are too long or too short, bag warping after heat sealing, bubbles in the heat-sealed area, or uneven surfaces. These defects affect the quality and appearance of the packaging bags, and in severe cases may even lead to product damage and waste. Therefore, they do not meet existing needs. We have proposed a packaging bag defect visual inspection system and method. Summary of the Invention
[0004] The present invention provides a system and method for visually inspecting packaging bag defects, which have the beneficial effect of optimizing the processing steps and solve the various defects that often occur in the production of packaging bags mentioned in the above background technology, such as uneven cutting lines resulting in edge dimensions that are too long or too short, warping of bags after heat sealing, bubbles generated in the heat-sealed area, or uneven surfaces. These defects will affect the quality and appearance of the packaging bags and, in severe cases, may also lead to damage and waste of products.
[0005] The present invention provides the following technical solutions: a packaging bag defect visual detection system and method thereof, wherein a packaging bag defect visual detection system comprises A visual shooting unit, used to shoot and collect the appearance of target graphics in a specific area; An edge comparison module, wherein the area formed by the tic-tac-toe pattern is used for comparison with the area of the packaging bag. The edge comparison module is used for visually comparing the dimensional deviation of the packaging bag and adjusting the detection area; A conveying module, wherein the conveying module conveyor belt is used to provide support conditions for packaging bag inspection; A lateral pushing module includes a push rod and a cylinder. The push rod is used to push defective packaging bags out of the upper area of the conveyor belt.
[0006] As an optional solution of the packaging bag defect visual inspection system of the present invention, wherein: the horizontal comparison rod and the vertical comparison rod are included, and there are two horizontal comparison rods and two vertical comparison rods, and the two horizontal comparison rods and the two vertical comparison rods are used to form a tic-tac-toe shape; The horizontal comparison rod and the vertical comparison rod are located below the packaging belt conveyor.
[0007] As an optional solution of the packaging bag defect visual inspection system of the present invention, wherein: the visual shooting unit includes a graphics processor, a storage module, an industrial camera and a control panel; An industrial camera is placed vertically above the packaging belt conveyor. The industrial camera is used for image acquisition and identifies the area data of the packaging bag, as well as the length and width data of the packaging bag, and stores them in a storage module.
[0008] As an optional solution of the packaging bag defect visual inspection system described in the present invention, the graphics processor is electrically connected to the industrial camera, and the graphics processor is used to perform three-dimensional modeling of the data obtained from the storage module.
[0009] As an optional solution of the packaging bag defect visual inspection system of the present invention, there is a control panel, which is used to issue control instructions to the industrial camera, graphics processor and storage module.
[0010] As an optional solution of the packaging bag defect visual inspection system described in the present invention, the control panel includes a control keyboard and a display, the three-dimensional modeling is displayed through the display, and the size data of the packaging bag is pre-input into the industrial camera through the control panel.
[0011] As an optional solution of the packaging bag defect visual inspection system of the present invention, the transmission module includes a conveyor belt and a power system, and the packaging belt conveyor belt is made of transparent material.
[0012] As an optional solution of the packaging bag defect visual inspection system of the present invention, wherein: a lateral push module, the lateral push module further includes a contact roller, a limit support column, a laser sensor and a limit ring; a contact roller, wherein the packaging bag is placed on the upper surface of the conveyor belt, and the contact roller is used to roll on the upper surface of the conveyor belt and roll over the upper surface of the packaging bag; A limiting support column, the lower end of which is connected to the contact roller, and the upper end of which is used to fix the laser sensor.
[0013] As an optional solution of the packaging bag defect visual detection system of the present invention, wherein: a laser sensor, the laser sensor is directed toward the area directly below and detects the distance between the upper end of the limit support column and the upper surface of the packaging bag in real time; A limiting ring sleeve is used to position the limiting support column in the working area.
[0014] As an optional solution of the packaging bag defect visual inspection system and method described in the present invention, wherein: S1. The finished packaging bag is transported by the conveyor belt. When the industrial camera moves to the lower end, the industrial camera will record the size data of the packaging bag and transmit it to the storage module. It will then compare it with the pre-entered size. If the size data is within the normal range, the conveyor belt will drive the packaging bag backward. If the packaging bag is unqualified, the cylinder will provide driving power to the push rod and push the unqualified packaging bag out. S2. Through the combined effect of two horizontal comparison rods and a vertical comparison rod, the two horizontal comparison rods are placed in parallel, while the vertical comparison rod is placed vertically and parallel, and is in contact with the lower surface of the two vertical comparison rods. The two vertical comparison rods and the horizontal comparison rod are combined and installed at the contact point using an integrated pipe sleeve to form an integrated structure in the shape of a well. The middle area of the well needs to be pre-adjusted to a size consistent with the perimeter of the packaging bag, so that the periphery of the packaging bag is consistent with the middle of the well, and the edges overlap. When the conveyor belt transports the packaging bag to the bottom of the industrial camera, the industrial camera scans it directly vertically downward. If the edge of the packaging bag appears to be submerged in the edge of the well, it is determined that the packaging bag has a defect and will be pushed out by the push rod; S3. When the bag moves to the bottom of the industrial camera via the conveyor belt, the contact roller will roll to the upper surface of the bag and fluctuate according to the height of the bag on the upper surface of the conveyor belt. While rolling on the upper surface of the bag, if there are wrinkles or defects, the contact roller will fall and rise while rolling, and drive the limit support column to rise. The laser sensor is supported by the limit support column, and the limit support column is limited by the limit collar so that it can only be located here. The ground clearance is calculated by the laser sensor. If it exceeds the bag thickness data previously entered into the control panel, the item will be judged as a defective product.
[0015] The present invention also provides a packaging bag defect visual detection system and method thereof. The present invention has the following beneficial effects: 1. This packaging bag defect visual inspection system uses a tic-tac-toe structure formed by two horizontal and vertical comparison rods to compare the packaging bag with the center area of the tic-tac-toe. If the edge of the packaging bag does not exceed or is less than the center area of the tic-tac-toe, it will be scanned by the industrial camera, determined to be a defective product, and rejected. At the same time, the combination of the horizontal comparison rod and the vertical comparison rod can be changed in area according to the usage. It is flexible in operation and can adapt to scans of various sizes. For the covering scanning method of packaging bags and criss-cross structures, other photosensitive devices can be used instead to save costs and facilitate subsequent maintenance and replacement, thereby realizing the detection of external dimension deviations during packaging bag production and processing operations that are difficult to adapt to various packaging bag sizes.
[0016] 2. This packaging bag defect visual inspection system utilizes the leaking area of the defective packaging bag, adopts a contact roller to directly roll in contact with the packaging bag, and uses the supporting laser sensor to measure the height difference data. If it exceeds the thickness dimension of the packaging bag, it will be judged as a defective product. In this way, it can achieve the uniform detection of the thickness of the packaging bag, as well as the situation of bubbles or uneven surface after heat sealing. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall process of the present invention. DETAILED DESCRIPTION
[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0019] Example 1, please refer to Figure 1 , and discloses a packaging bag defect visual detection system, including A visual shooting unit, used to shoot and collect the appearance of target graphics in a specific area; An edge comparison module, wherein the area formed by the tic-tac-toe pattern is used for comparison with the area of the packaging bag. The edge comparison module is used for visually comparing the dimensional deviation of the packaging bag and adjusting the detection area; A conveying module, wherein the conveying module conveyor belt is used to provide support conditions for packaging bag inspection; A lateral push module, comprising a push rod and a cylinder, wherein the push rod is used to push defective packaging bags out of the upper area of the conveyor belt; The device comprises a horizontal comparison rod and a vertical comparison rod, wherein there are two horizontal comparison rods and two vertical comparison rods, and the two horizontal comparison rods and the two vertical comparison rods are used to form a tic-tac-toe shape; The horizontal comparison rod and the vertical comparison rod are located below the packaging belt conveyor; The visual shooting unit includes a graphics processor, a storage module, an industrial camera and a control panel; An industrial camera is placed vertically above the packaging conveyor belt. The industrial camera is used to capture images and identify the area data, length and width data of the packaging bag, and store them in a storage module. A graphics processor, the graphics processor being electrically connected to the industrial camera and configured to perform three-dimensional modeling on the data obtained from the storage module; A control panel, configured to issue control instructions to the industrial camera, the graphics processor, and the storage module; The control panel includes a control keyboard and a display, the three-dimensional model is displayed on the display, and the size data of the packaging bag is pre-input into the industrial camera through the control panel; A conveying module, comprising a conveyor belt and a power system, wherein the packaging conveyor belt is made of a transparent material; Before production, the length, width, and single-layer thickness of the packaging bag are input into the control template. The finished packaging bag is transported by a conveyor belt. When the industrial camera moves to its lower end, the industrial camera will record the packaging bag's dimensional data and transmit it to the storage module. The industrial camera collects light from external objects through the lens and converts it into an electrical signal. It uses a CCD or CMOS photosensitive element to convert the physical image on the photosensitive element into an electronic signal. The photosensitive element adopts an array structure, and each pixel corresponds to a photosensitive element. The electrical signal is converted into an analog signal. The analog circuit inside the industrial camera amplifies and filters the collected electrical signal to enhance the quality and clarity of the image.
[0020] Convert analog signals into digital signals. After being processed by an analog-to-digital converter, the analog signals are converted into digital signals for subsequent digital processing and image analysis; The processed image data is transmitted to the external device to ensure efficient and real-time transmission of the image data, and compared with the pre-entered dimensions. If the dimension data is within the normal range, the conveyor belt will drive the packaging bag backward. If the packaging bag is unqualified, the cylinder will provide driving power to the push rod and push the unqualified packaging bag out of the upper surface of the conveyor belt; Through the combined effect of the two horizontal comparison rods and the vertical comparison rod, the two horizontal comparison rods are placed in parallel, while the vertical comparison rod is placed vertically and parallel, and fits with the lower surface of the two vertical comparison rods. The two vertical comparison rods and the horizontal comparison rod are fitted together at the joints, using an integrated pipe sleeve to combine and install the two structures to form a well-shaped integrated structure. The middle area of the well needs to be pre-adjusted to a size consistent with the perimeter of the packaging bag, so that the periphery of the packaging bag is consistent with the middle of the well, and the edges overlap. When the conveyor belt transports the packaging bag to the bottom of the industrial camera, the industrial camera scans it directly vertically downward. If the edge of the packaging bag appears to be submerged in the edge of the well, it is determined that the packaging bag has a defect and will be pushed out by the push rod; The device uses a tic-tac-toe structure formed by the combination of two horizontal comparison rods and a vertical comparison rod to compare the packaging bag with the middle area of the tic-tac-toe. If the edge of the packaging bag does not exceed or is less than the middle area of the tic-tac-toe, it will be scanned by the industrial camera, determined as a defective product, and ejected. At the same time, the combination of the horizontal comparison rod and the vertical comparison rod can change the area according to the usage. It is flexible to operate and can adapt to scans of various sizes. In addition, for the covering scanning method of the packaging bag and the tic-tac-toe structure, other photosensitive devices can be used instead to save costs and facilitate later maintenance and replacement.
[0021] Example 2: This example is an improvement made on the basis of Example 1. For details, please refer to Figure 1 , a lateral thrust module, the lateral thrust module further comprising a contact roller, a limiting support column, a laser sensor and a limiting ring sleeve; a contact roller, wherein the packaging bag is placed on the upper surface of the conveyor belt, and the contact roller is used to roll on the upper surface of the conveyor belt and roll over the upper surface of the packaging bag; A position-limiting support column, wherein the lower end of the position-limiting support column is connected to the contact roller, and the upper end of the position-limiting support column is used to fix the laser sensor; A laser sensor, the laser sensor facing the area directly below, and detecting the distance between the upper end of the limit support column and the upper surface of the packaging bag in real time; A limiting ring sleeve, the limiting ring sleeve is used to position the limiting support column in the working area; When the packaging bag moves to the bottom of the industrial camera via the conveyor belt, the contact roller will roll to the upper surface of the packaging bag and rise and fall according to the height of the packaging bag on the upper surface of the conveyor belt. While rolling, if there are wrinkles or defects on the upper surface of the packaging bag, the contact roller will fall and rise while rolling, and drive the limit support column to rise. The laser sensor is supported by the limit support column, and the limit support column is limited by the limit collar so that it can only be located there. The ground clearance is calculated by the laser sensor. If it exceeds the packaging bag thickness data previously entered in the control panel, the item will be judged as a defective product. By utilizing the leaking area of the defective packaging bag, the contact roller is used to directly roll with the packaging bag, and the height difference data generated by the support laser sensor is measured. If it exceeds the thickness dimension of the packaging bag, it will be judged as a defective product. In this way, the uniform thickness of the packaging bag can be detected, as well as the bubbles or uneven surface after heat sealing.
[0022] The present invention also provides a packaging bag defect visual detection system and method thereof, wherein: S1. The finished packaging bag is transported by the conveyor belt. When the industrial camera moves to the lower end, the industrial camera will record the size data of the packaging bag and transmit it to the storage module. It will then compare it with the pre-entered size. If the size data is within the normal range, the conveyor belt will drive the packaging bag backward. If the packaging bag is unqualified, the cylinder will provide driving power to the push rod and push the unqualified packaging bag out. S2. Through the combined effect of two horizontal comparison rods and a vertical comparison rod, the two horizontal comparison rods are placed in parallel, while the vertical comparison rod is placed vertically and parallel, and is in contact with the lower surface of the two vertical comparison rods. The two vertical comparison rods and the horizontal comparison rod are combined and installed at the contact point using an integrated pipe sleeve to form an integrated structure in the shape of a well. The middle area of the well needs to be pre-adjusted to a size consistent with the perimeter of the packaging bag, so that the periphery of the packaging bag is consistent with the middle of the well, and the edges overlap. When the conveyor belt transports the packaging bag to the bottom of the industrial camera, the industrial camera scans it directly vertically downward. If the edge of the packaging bag appears to be submerged in the edge of the well, it is determined that the packaging bag has a defect and will be pushed out by the push rod; S3. When the bag moves to the bottom of the industrial camera via the conveyor belt, the contact roller will roll to the upper surface of the bag and fluctuate according to the height of the bag on the upper surface of the conveyor belt. While rolling on the upper surface of the bag, if there are wrinkles or defects, the contact roller will fall and rise while rolling, and drive the limit support column to rise. The laser sensor is supported by the limit support column, and the limit support column is limited by the limit collar so that it can only be located here. The ground clearance is calculated by the laser sensor. If it exceeds the bag thickness data previously entered into the control panel, the item will be judged as a defective product.
[0023] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.
[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.
Claims
1. A packaging bag defect visual inspection system, including A visual shooting unit, used to shoot and collect the appearance of target graphics in a specific area; An edge comparison module, wherein the area formed by the tic-tac-toe pattern is used for comparison with the area of the packaging bag. The edge comparison module is used for visually comparing the dimensional deviation of the packaging bag and adjusting the detection area; A conveying module, wherein the conveying module conveyor belt is used to provide support conditions for packaging bag inspection; A lateral pushing module includes a push rod and a cylinder. The push rod is used to push defective packaging bags out of the upper area of the conveyor belt.
2. The packaging bag defect visual inspection system according to claim 1, characterized in that: The device comprises a horizontal comparison rod and a vertical comparison rod, wherein there are two horizontal comparison rods and two vertical comparison rods, and the two horizontal comparison rods and the two vertical comparison rods are used to form a tic-tac-toe shape; The horizontal comparison rod and the vertical comparison rod are located below the packaging belt conveyor.
3. The packaging bag defect visual inspection system according to claim 2, characterized in that: The visual shooting unit includes a graphics processor, a storage module, an industrial camera and a control panel; An industrial camera is placed vertically above the packaging belt conveyor. The industrial camera is used for image acquisition and identifies the area data of the packaging bag, as well as the length and width data of the packaging bag, and stores them in a storage module.
4. The packaging bag defect visual inspection system according to claim 3, characterized in that: A graphics processor is electrically connected to the industrial camera and is used to perform three-dimensional modeling on the data obtained from the storage module.
5. The packaging bag defect visual inspection system according to claim 4, characterized in that: A control panel is used to issue control instructions to the industrial camera, the graphics processor, and the storage module.
6. The packaging bag defect visual inspection system according to claim 5, characterized in that: The control panel includes a control keyboard and a display, the three-dimensional modeling is displayed through the display, and the size data of the packaging bag is pre-input into the industrial camera through the control panel.
7. The packaging bag defect visual inspection system according to claim 6, characterized in that: The conveying module includes a conveyor belt and a power system, and the packaging conveyor belt is made of transparent material.
8. The packaging bag defect visual inspection system according to claim 7, characterized in that: A lateral thrust module, the lateral thrust module further comprising a contact roller, a limit support column, a laser sensor and a limit ring; a contact roller, wherein the packaging bag is placed on the upper surface of the conveyor belt, and the contact roller is used to roll on the upper surface of the conveyor belt and roll over the upper surface of the packaging bag; A limiting support column, the lower end of which is connected to the contact roller, and the upper end of which is used to fix the laser sensor.
9. The packaging bag defect visual inspection system according to claim 8, characterized in that: A laser sensor, the laser sensor facing the area directly below, and detecting the distance between the upper end of the limit support column and the upper surface of the packaging bag in real time; A limiting ring sleeve is used to position the limiting support column in the working area.
10. The packaging bag defect visual inspection system and method according to claim 9, characterized in that: S1. The finished packaging bag is transported by the conveyor belt. When the industrial camera moves to the lower end, the industrial camera will record the size data of the packaging bag and transmit it to the storage module. It will then compare it with the pre-entered size. If the size data is within the normal range, the conveyor belt will drive the packaging bag backward. If the packaging bag is unqualified, the cylinder will provide driving power to the push rod and push the unqualified packaging bag out. S2. Through the combined effect of two horizontal comparison rods and a vertical comparison rod, the two horizontal comparison rods are placed in parallel, while the vertical comparison rod is placed vertically and parallel, and is in contact with the lower surface of the two vertical comparison rods. The two vertical comparison rods and the horizontal comparison rod are combined and installed at the contact point using an integrated pipe sleeve to form an integrated structure in the shape of a well. The middle area of the well needs to be pre-adjusted to a size consistent with the perimeter of the packaging bag, so that the periphery of the packaging bag is consistent with the middle of the well, and the edges overlap. When the conveyor belt transports the packaging bag to the bottom of the industrial camera, the industrial camera scans it directly vertically downward. If the edge of the packaging bag appears to be submerged in the edge of the well, it is determined that the packaging bag has a defect and will be pushed out by the push rod; S3. When the bag moves to the bottom of the industrial camera via the conveyor belt, the contact roller will roll to the upper surface of the bag and fluctuate according to the height of the bag on the upper surface of the conveyor belt. While rolling on the upper surface of the bag, if there are wrinkles or defects, the contact roller will fall and rise while rolling, and drive the limit support column to rise. The laser sensor is supported by the limit support column, and the limit support column is limited by the limit collar so that it can only be located here. The ground clearance is calculated by the laser sensor. If it exceeds the bag thickness data previously entered into the control panel, the item will be judged as a defective product.