A packaging bag weld visual positioning system

Abstract

The application provides a packaging bag welding seam visual positioning system applied to positioning and cutting of a packaging bag roll with preset welding seams in an automatic packaging line, the packaging bag roll is provided with a plurality of hot melt welding seams in a length direction; the system comprises: a light source assembly 1 installed on a packaging bag roll conveying path, used for projecting uniform light to the roll surface; an image acquisition module 2 arranged above or in front of the conveying path downstream of the light source assembly 1, the lens of the image acquisition module 2 is perpendicular or inclined to the roll surface, used for capturing images containing hot melt welding seams in real time; a visual processing unit 3 electrically connected with the image acquisition module 2 through a signal line, used for receiving image data and identifying position information of the welding seam; a servo driving device 4 connected with a roll unwinding shaft through a transmission mechanism, used for controlling the conveying speed and stop position of the roll; the visual processing unit 3 is also electrically connected with the servo driving device 4, used for receiving the welding seam identification result and issuing a cutting action instruction.

Description

Technical Field

[0001] This application relates to the field of automated packaging technology, and in particular to a visual positioning system for the weld seam of a packaging bag. Background Technology

[0002] Currently, in industrial automated packaging lines, the common practice is to use a hot-melt and cutting system that is integrated with the automated packaging line for hot-melt and cutting operations. This system is characterized by continuous operation and simple requirements for packaging bags.

[0003] However, due to slight deviations in the position of the weld formed by on-site hot melting, subsequent cutting processes struggle to achieve high-precision positioning. Traditional systems typically rely on mechanical limits or simple photoelectric sensors for cutting control, which cannot detect the actual position of the weld in real time. This results in poor alignment between the cutting position and the weld, easily leading to uneven cuts, weld damage, or material waste. This deviation is further amplified, especially on high-speed production lines, severely impacting the appearance and functionality of the packaging bags. Utility Model Content

[0004] To address the aforementioned issues, this application provides a visual positioning system for packaging bag weld seams, which is used in an automated packaging line to position and cut packaging bag rolls with pre-set weld seams. The packaging bag rolls have multiple hot-melt weld seams spaced apart along their length.

[0005] The system includes:

[0006] The light source assembly (1) is installed on the conveying path of the packaging bag roll and is used to project uniform light onto the surface of the roll.

[0007] The image acquisition module (2) is located above or in front of the conveying path downstream of the light source assembly (1), and its lens is perpendicular or inclined to the surface of the roll material to capture images containing hot melt welds in real time.

[0008] The vision processing unit (3) is electrically connected to the image acquisition module (2) via a signal line and is used to receive image data and identify the position information of the weld.

[0009] The servo drive device (4) is connected to the roll unwinding shaft through the transmission mechanism and is used to control the conveying speed and stop position of the roll.

[0010] The vision processing unit (3) is also electrically connected to the servo drive device (4) to receive the weld recognition result and issue a cutting action command.

[0011] In a preferred embodiment, the light source assembly (1) is disposed below the packaging bag roll conveying path;

[0012] The light source assembly (1) includes a uniformly bright LED light source and an adjustable angle bracket. The light source bracket is fixed to the frame by a thread or quick-release structure and its position can be adjusted horizontally and vertically.

[0013] In a preferred embodiment, the image acquisition module (2) is positioned above the packaging bag roll conveying path;

[0014] The image acquisition module (2) is an area array or line array industrial camera, and the center point of its lens coincides with the longitudinal center line of the roll material.

[0015] In a preferred embodiment, the vision processing unit (3) has a built-in reference template database of weld images, calculates the deviation between the actual position and the theoretical position of the weld through an image comparison algorithm, and converts the deviation into a control signal to feed back to its built-in control system. The control system outputs a dynamic compensation command to the servo drive device (4) accordingly.

[0016] In a preferred embodiment, the control system integrates a re-inspection logic module. After the servo drive device (4) stops, the control image acquisition module (2) takes another picture of the weld seam and verifies the weld seam position accuracy through the vision processing unit (3). After the verification is passed, a cutting command is sent to the cutting device.

[0017] In a preferred embodiment, the servo drive device (4) is connected to the unwinding shaft of the roll material via a synchronous belt drive or a roller drive, the transmission ratio of the synchronous belt or roller is 1:1, and the encoder of the servo drive device (4) forms a closed-loop feedback loop with the control system.

[0018] In a preferred embodiment, the light source assembly (1) and the image acquisition module (2) are integrated on an adjustable mounting frame, which is fixed to the frame of the automatic packaging line by bolts or quick-release structure, and can be automatically calibrated in the horizontal and vertical directions by an electric adjustment mechanism. The vision processing unit (3) is installed in the control cabinet.

[0019] In a preferred embodiment, the vision processing unit (3) is equipped with a communication interface and is connected to the PLC control system of the automatic packaging line via Ethernet or industrial bus to realize multi-station collaborative control.

[0020] The technical solutions provided in this application embodiment may include the following beneficial effects:

[0021] This invention replaces the on-site hot-melt process in traditional automated packaging lines by using pre-heat-sealed packaging bag rolls from an external supplier. This fundamentally avoids problems such as uneven weld strength, incomplete welds, and material leakage caused by temperature and pressure fluctuations, significantly improving weld quality and product reliability. Simultaneously, the system eliminates on-site heating devices, reducing energy consumption and equipment maintenance costs.

[0022] Building upon this foundation, the system utilizes a light source component in conjunction with an image acquisition module, along with a vision processing unit and a control system, to achieve high-precision identification and positioning of pre-set weld seams. The control system dynamically adjusts the servo drive to ensure precise alignment of the weld seam with the cutting position, and a re-inspection mechanism guarantees accurate positioning. This vision-based closed-loop control method effectively solves the problem of insufficient positioning accuracy in traditional mechanical systems, significantly improving cutting precision and production automation, making it suitable for high-speed, high-stability packaging requirements. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] Figure 1 This is a schematic diagram of a visual positioning system for the weld seam of a packaging bag provided in an exemplary embodiment of this application;

[0025] Figure 2 This is a schematic diagram of light source illumination provided in an exemplary embodiment of this application;

[0026] Figure 3 This is a schematic diagram of an image acquisition module provided in an exemplary embodiment of this application.

[0027] Figure Labels

[0028] 1-Light source assembly

[0029] 2-Image Acquisition Module

[0030] 3-Vision Processing Unit

[0031] 4-Servo drive device Detailed Implementation

[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0033] This utility model's packaging bag weld seam visual positioning system utilizes a preheated, melt-sealed packaging bag roll provided by an external supplier, with intermittently spaced hot-melt weld seams along its length, to work in conjunction with a positioning device in an automated packaging line, achieving high-precision cutting control. For example... Figure 1As shown, the system provided by this utility model includes a light source component 1, an image acquisition module 2, a vision processing unit 3, a servo drive device 4, and a control system built into the vision processing unit 3. The components are mechanically and electrically connected to form a closed-loop system.

[0034] The light source assembly 1 is installed below the roll material conveying path, uses a highly uniform LED light source, and is mounted on an adjustable angle bracket. For example... Figure 2 As shown, the angle between the light direction and the surface of the roll material can be adjusted according to the actual working mode to ensure that the light evenly covers the weld area. The bracket is fixed to the frame by threads or a quick-release structure, supporting horizontal and vertical adjustment to accommodate roll materials of different thicknesses or widths.

[0035] Image acquisition module 2 is an area array or line array industrial camera. For example, the lens is mounted on a camera bracket, with the lens center point coinciding with the longitudinal centerline of the roll material. The camera bracket is finely adjusted horizontally via a guide rail slider assembly to ensure the lens is aligned with the weld seam extension direction. Vision processing unit 3 is installed inside a control cabinet. The industrial camera is electrically connected to vision processing unit 3 via a signal cable to transmit image data in real time.

[0036] like Figure 3 As shown, the vision processing unit 3 has a built-in reference template database of weld images and calculates the deviation between the actual and theoretical positions of the weld using an image comparison algorithm. The deviation value is fed back to the control system via a control signal, and the control system outputs a dynamic compensation command to the servo drive device 4 accordingly.

[0037] The servo drive unit 4 is connected to the roll unwinding shaft via a synchronous belt drive or roller drive; for example, the transmission ratio can be 1:1. The encoder of the servo drive unit 4 forms a closed-loop feedback loop with the control system to ensure precise control of the roll conveying position.

[0038] The control system integrates a re-inspection logic module: after the servo drive device 4 stops, the control image acquisition module 2 re-captures the weld image and verifies the weld position accuracy through the vision processing unit 3. Upon successful verification, the control system sends a cutting command to the cutting device. The vision processing unit 3 is also equipped with a communication interface such as Ethernet or industrial bus to connect with the PLC control system of the automated packaging line, enabling multi-station collaborative control.

[0039] Through the above implementation methods, this system realizes a complete closed loop from weld seam identification to cutting control, solves the problem of unstable weld seam quality caused by factors such as temperature and pressure in traditional processes, and significantly improves the cutting accuracy and production efficiency of packaging bags.

[0040] The system provided by this utility model will be further described in detail below in conjunction with the system's workflow.

[0041] S1. The light source assembly 1 is activated, projecting uniform light onto the surface of the roll material.

[0042] S2. Servo drive 4 is activated to drive the roll material feed at a set speed.

[0043] S3. Image acquisition module 2 captures images of the roll surface in real time and transmits them to vision processing unit 3.

[0044] S4. The vision processing unit 3 identifies the weld position through an image comparison algorithm and calculates the deviation value.

[0045] S5. The control system generates dynamic compensation commands based on the deviation value, adjusts the speed and start / stop of the servo drive device 4, and aligns the weld seam with the preset cutting position.

[0046] S6. When the weld reaches the preset cutting position, the control system triggers the servo drive 4 to decelerate and stop.

[0047] S7. The control system starts the re-inspection logic module and controls the image acquisition module 2 to take another picture of the weld seam to verify the position accuracy.

[0048] S8. After verification, the control system sends a cutting command to the cutting device to complete the cutting operation.

[0049] The system provided by this utility model uses packaging bag rolls that are pre-heat-sealed and formed at fixed intervals by an external supplier. This avoids problems such as unstable weld strength and material leakage caused by factors such as heating temperature, pressure, and time during on-site heat-sealing, and significantly improves the stability of packaging quality.

[0050] Meanwhile, this system, through the combination of a highly uniform LED light source and an industrial camera, along with the image comparison algorithm of the vision processing unit, achieves millimeter-level precision identification of weld seam positions, ensuring the accuracy of the cutting position. Combined with the dynamic compensation function of the control system, it can correct coil feeding errors in real time, and the re-inspection logic module further verifies the weld seam positioning accuracy, effectively reducing the cutting failure rate caused by mechanical errors or environmental interference.

[0051] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered illustrative only, and the true scope and spirit of this application are indicated by the following claims.

[0052] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A visual positioning system for weld seams of packaging bags, characterized in that, This method is used in automated packaging lines to position and cut packaging bag rolls with pre-set welds, wherein multiple hot-melt welds are spaced apart along the length of the packaging bag roll. The system includes: The light source assembly (1) is installed on the conveying path of the packaging bag roll and is used to project uniform light onto the surface of the roll. The image acquisition module (2) is located above or in front of the conveying path downstream of the light source assembly (1), and its lens is perpendicular or inclined to the surface of the roll material to capture images containing hot melt welds in real time. The vision processing unit (3) is electrically connected to the image acquisition module (2) via a signal line and is used to receive image data and identify the position information of the weld. The servo drive device (4) is connected to the roll unwinding shaft through the transmission mechanism and is used to control the conveying speed and stop position of the roll. The vision processing unit (3) is also electrically connected to the servo drive device (4) to receive the weld recognition result and issue a cutting action command.

2. The visual positioning system for packaging bag weld seams according to claim 1, characterized in that, The light source assembly (1) is located below the packaging bag roll conveying path; The light source assembly (1) includes a uniformly bright LED light source and an adjustable angle bracket. The light source bracket is fixed to the frame by a thread or quick-release structure and its position can be adjusted horizontally and vertically.

3. The visual positioning system for packaging bag weld seams according to claim 1, characterized in that, The image acquisition module (2) is positioned above the packaging bag roll conveying path; The image acquisition module (2) is an area array or line array industrial camera, and the center point of its lens coincides with the longitudinal center line of the roll material.

4. The visual positioning system for packaging bag weld seams according to claim 1, characterized in that, The vision processing unit (3) has a built-in reference template database of weld images. It calculates the deviation between the actual position and the theoretical position of the weld through an image comparison algorithm, and converts the deviation into a control signal to feed back to its built-in control system. The control system outputs dynamic compensation instructions to the servo drive device (4) accordingly.

5. The visual positioning system for packaging bag weld seams according to claim 4, characterized in that, The control system integrates a re-inspection logic module. After the servo drive device (4) stops, the control image acquisition module (2) takes another picture of the weld seam and verifies the weld seam position accuracy through the vision processing unit (3). After the verification is passed, a cutting command is sent to the cutting device.

6. The visual positioning system for packaging bag weld seams according to claim 5, characterized in that, The servo drive device (4) is connected to the unwinding shaft of the roll material via a synchronous belt drive or a roller drive. The transmission ratio of the synchronous belt or roller is 1:1, and the encoder of the servo drive device (4) forms a closed-loop feedback loop with the control system.

7. The visual positioning system for packaging bag weld seams according to claim 1, characterized in that, The light source component (1) and the image acquisition module (2) are integrated on an adjustable mounting frame. The mounting frame is fixed to the frame of the automatic packaging line by bolts or quick-release structure, and can be automatically calibrated in the horizontal and vertical directions by an electric adjustment mechanism. The vision processing unit (3) is installed in the control cabinet.

8. The visual positioning system for packaging bag weld seams according to claim 6, characterized in that, The vision processing unit (3) is equipped with a communication interface and is connected to the PLC control system of the automatic packaging line via Ethernet or industrial bus to realize multi-station collaborative control.

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