阅读说明：本技术 包装袋次品剔除方法 (Defective packaging bag eliminating method ) 是由 张福 刘敏 包成云 贺军鑫 张海涛 马金龙 杨静 冉浩 胡明华 于 2020-03-08 设计创作，主要内容包括：本发明公开了一种包装袋次品剔除方法,包括以下步骤：对包装袋印刷膜进行检测,在有瑕疵的包装袋上贴瑕疵标签,然后收卷；将成卷的包装袋印刷膜置于制袋机上,放卷加工包装袋；在制袋机的出袋端衔接剔除装置,在制袋机或剔除装置上检测识别瑕疵标签；有瑕疵标签的包装袋到达剔除装置的剔除位置时,剔除装置对有瑕疵标签的包装袋进行剔除。本发明能够准确的检测识别有瑕疵的包装袋,进而实现准确的次品剔除。(The invention discloses a method for removing defective packaging bags, which comprises the following steps: detecting a packaging bag printing film, pasting a flaw label on a defective packaging bag, and then rolling; placing the coiled packaging bag printing film on a bag making machine, and unreeling to process packaging bags; connecting a bag outlet end of the bag making machine with an eliminating device, and detecting and identifying a flaw label on the bag making machine or the eliminating device; when the packaging bags with the defective labels reach the removing position of the removing device, the removing device removes the packaging bags with the defective labels. The invention can accurately detect and identify the defective packaging bags, thereby realizing accurate defective product elimination.)

1. A method for removing defective packaging bags is characterized in that: the method comprises the following steps:

detecting a packaging bag printing film, pasting a flaw label on a defective packaging bag, and then rolling;

placing the coiled packaging bag printing film on a bag making machine, and unreeling to process packaging bags;

connecting a bag outlet end of the bag making machine with an eliminating device, and detecting and identifying a flaw label on the bag making machine or the eliminating device;

when the packaging bags with the defective labels reach the removing position of the removing device, the removing device removes the packaging bags with the defective labels.

2. The defective packaging bag eliminating method according to claim 1, wherein: and detecting the printed film of the packaging bag in a printing section or a quality inspection section.

3. The defective packaging bag eliminating method according to claim 1, wherein: and arranging a visual detection system to detect the packaging bag printing film.

4. The defective packaging bag eliminating method according to claim 3, wherein: the visual detection system comprises an image acquisition device for photographing the printed film of the packaging bag and software for analyzing and judging the image.

5. The defective packaging bag eliminating method according to claim 1, wherein: the defective packaging bag comprises one or more of a packaging bag with printing defects, a contaminated packaging bag, a packaging bag with foreign matters and a packaging bag with seams.

6. The defective packaging bag eliminating method according to claim 1, wherein: the defective label is detected and identified by detecting the thickness, color, conductivity, magnetism, light absorption or light reflection characteristics of the label.

7. The defective packaging bag eliminating method according to claim 6, wherein: and a thickness detection device, a color detection device, a conductivity detection device, a magnetic detection device or a photoelectric detection device is arranged on the bag making machine or the rejecting device to detect and identify the flaw label.

8. The defective packaging bag eliminating method according to claim 7, wherein: the thickness detection device comprises a thickness sensor, and the thickness sensor acquires a thickness signal of the packaging bag; setting a threshold value of the thickness signal according to the thickness of the defective label; and when the thickness signal acquired by the thickness sensor reaches a set threshold value, judging that the flaw label is detected.

9. The defective packaging bag eliminating method according to claim 7, wherein: the thickness detection device comprises a distance sensor, and the distance sensor acquires a distance signal of the surface of the packaging bag in the vertical direction; setting a threshold value of the distance signal according to the thickness of the defective label; and when the distance signal acquired by the distance sensor reaches a set threshold value, judging that the flaw label is detected.

10. The defective packaging bag eliminating method according to claim 7, wherein: the color detection device comprises a color sensor, and the color sensor acquires color signals on the surface of the packaging bag; setting a threshold value of a color signal according to the color of the defective label; and when the color signal acquired by the color sensor reaches a set threshold value, judging that the defective label is detected.

11. The defective packaging bag eliminating method according to claim 7, wherein: the conductivity detection device comprises a conductivity sensor, and the conductivity sensor acquires a conductivity signal on the surface of the packaging bag; setting a threshold value of a conductance signal according to the conductivity of the defective label; and when the conductance signal acquired by the conductance sensor reaches a set threshold value, judging that the flaw label is detected.

12. The defective packaging bag eliminating method according to claim 7, wherein: the magnetic detection device comprises a magnetic sensor, and the magnetic sensor acquires a magnetic signal on the surface of the packaging bag; setting a threshold value of a magnetic signal according to the magnetism of the defective label; and when the magnetic signal acquired by the magnetic sensor reaches a set threshold value, judging that the flaw label is detected.

13. The defective packaging bag eliminating method according to claim 7, wherein: the photoelectric detection device comprises a photoelectric sensor, and the photoelectric sensor acquires an optical signal of the packaging bag; setting a threshold value of an optical signal according to the optical absorption or optical reflection characteristics of the defective label; and when the optical signal acquired by the photoelectric sensor reaches a set threshold value, judging that the flaw label is detected.

14. The defective packaging bag eliminating method according to claim 1, wherein: the removing device comprises a transmission mechanism, a removing channel and a removing mechanism, the removing channel comprises a gap on the transmission mechanism, the removing mechanism is located above the removing channel, and the removing mechanism removes the packaging bags downwards from the removing channel after receiving a removing signal.

15. The defective packaging bag removing method according to claim 14, wherein: the rejecting mechanism comprises a pressing module and/or a guiding module, when the rejecting mechanism receives a rejecting signal, the rejecting mechanism extends downwards, the guiding module guides the packaging bag to the rejecting channel, and the pressing module presses the packaging bag downwards towards the rejecting channel.

16. The defective packaging bag removing method according to claim 14 or 15, wherein: and before the packaging bags with the defective labels reach the removing channel or when the packaging bags reach the removing channel, the removing mechanism receives a removing signal.

Technical Field

The invention relates to the technical field of packaging bag production, in particular to a method for removing defective packaging bags.

Background

The packaging bag is seen everywhere in our life, and the existing packaging bag production flow comprises the steps of printing patterns on a thin film to obtain a packaging bag printing film, then placing the coiled packaging bag printing film on a bag making machine, and unreeling to process the packaging bag.

For defective packaging bags, such as packaging bags with printing defects, contaminated packaging bags and seamed packaging bags, time and labor are wasted if manual removal is adopted, and various defective product removing devices are already arranged in the prior art, such as a patent CN201910528708.7 previously applied by the applicant of the invention, and defective products can be automatically and accurately removed in a mechanical removing mode.

However, how to accurately detect and identify defective packaging bags is a technical problem. Because the defective product eliminating device is usually connected with the bag outlet end of the bag making machine, the bag making machine unreels the coiled packaging bag printing film to process the coiled packaging bag printing film into packaging bags, then cuts the packaging bags into individual packaging bags at the tail ends, and then enters the defective product eliminating device. Therefore, the prior art solutions all focus on how to install a detection device on the bag making machine to detect and identify defective packaging bags, that is, to detect defective packaging bags on line and then reject the defective packaging bags. Because the vibration of the bag making machine is large and the vibration of the printing film of the packaging bag is obvious, accurate image acquisition and accurate detection and identification are difficult to realize.

Disclosure of Invention

The invention aims to provide a defective packaging bag removing method which can accurately detect and identify defective packaging bags and further realize accurate defective product removal.

In order to achieve the above purpose, the invention adopts the technical scheme that:

a method for removing defective packaging bags comprises the following steps: detecting a packaging bag printing film, pasting a flaw label on a defective packaging bag, and then rolling; placing the coiled packaging bag printing film on a bag making machine, and unreeling to process packaging bags; connecting a bag outlet end of the bag making machine with an eliminating device, and detecting and identifying a flaw label on the bag making machine or the eliminating device; when the packaging bags with the defective labels reach the removing position of the removing device, the removing device removes the packaging bags with the defective labels.

Preferably, the detection of the printed film of the packaging bag is performed in a printing section or a quality inspection section.

As a preferable technical scheme, a visual detection system is arranged to detect the printed film of the packaging bag.

As a preferable technical scheme, the visual detection system comprises an image acquisition device for photographing the printed film of the packaging bag and software for analyzing and judging the image.

As a preferable technical scheme, the defective packaging bag comprises one or more of a packaging bag with printing defects, a contaminated packaging bag, a packaging bag with foreign matters and a packaging bag with seams.

Preferably, the defective label is detected and identified by detecting the thickness, color, conductivity, magnetism, light absorption or light reflection characteristics of the label.

Preferably, the bag making machine or the rejecting device is provided with a thickness detection device, a color detection device, a conductivity detection device, a magnetic detection device or a photoelectric detection device for detecting and identifying the flaw label.

According to a preferable technical scheme, the thickness detection device comprises a thickness sensor, and the thickness sensor acquires a thickness signal of the packaging bag; setting a threshold value of the thickness signal according to the thickness of the defective label; and when the thickness signal acquired by the thickness sensor reaches a set threshold value, judging that the flaw label is detected.

As a preferable technical scheme, the thickness detection device comprises a distance sensor, wherein the distance sensor acquires a distance signal of the surface of the packaging bag in the vertical direction; setting a threshold value of the distance signal according to the thickness of the defective label; and when the distance signal acquired by the distance sensor reaches a set threshold value, judging that the flaw label is detected.

As a preferred technical scheme, the color detection device comprises a color sensor, wherein the color sensor acquires a color signal of the surface of the packaging bag; setting a threshold value of a color signal according to the color of the defective label; and when the color signal acquired by the color sensor reaches a set threshold value, judging that the defective label is detected.

As a preferred technical scheme, the conductivity detection device comprises a conductivity sensor, wherein the conductivity sensor acquires a conductivity signal on the surface of the packaging bag; setting a threshold value of a conductance signal according to the conductivity of the defective label; and when the conductance signal acquired by the conductance sensor reaches a set threshold value, judging that the flaw label is detected.

As a preferred technical scheme, the magnetic detection device comprises a magnetic sensor, wherein the magnetic sensor acquires a magnetic signal on the surface of the packaging bag; setting a threshold value of a magnetic signal according to the magnetism of the defective label; and when the magnetic signal acquired by the magnetic sensor reaches a set threshold value, judging that the flaw label is detected.

As a preferred technical scheme, the photoelectric detection device comprises a photoelectric sensor, and the photoelectric sensor collects optical signals of the packaging bag; setting a threshold value of an optical signal according to the optical absorption or optical reflection characteristics of the defective label; and when the optical signal acquired by the photoelectric sensor reaches a set threshold value, judging that the flaw label is detected.

According to the preferable technical scheme, the removing device comprises a transmission mechanism, a removing channel and a removing mechanism, the removing channel comprises a gap in the transmission mechanism, the removing mechanism is located above the removing channel, and the removing mechanism removes the packaging bags downwards from the removing channel after receiving a removing signal.

According to the preferable technical scheme, the removing mechanism comprises a pressing module and/or a guiding module, when the removing mechanism receives a removing signal, the removing mechanism extends downwards, the guiding module guides the packaging bag to the removing channel, and the pressing module presses the packaging bag downwards towards the removing channel.

As an optimized technical scheme, before the packaging bag with the defective label reaches the rejecting channel or when the packaging bag reaches the rejecting channel, the rejecting mechanism receives a rejecting signal.

The invention has the beneficial effects that:

the invention adopts a method of firstly detecting a defective packaging bag off line, pasting a defective label on the defective packaging bag, then detecting and identifying the defective label on line, and then removing. Because the bag making machine is separated during off-line detection, the interference of the bag making machine with larger vibration on image acquisition and detection identification is avoided, and the defective packaging bags can be accurately detected and identified. When the defective label is detected and identified on line, the requirement on detection precision is not high, so that the packaging bag with the defective label can be accurately detected and identified. In conclusion, the invention can accurately detect and identify the defective packaging bags, thereby realizing accurate defective product elimination.

Drawings

FIG. 1 is a schematic structural diagram of unwinding a printed film of a detection packaging bag at a quality inspection section;

FIG. 2 is a schematic view of the construction of the bag machine and the reject apparatus;

FIG. 3 is a schematic view of a thickness detection device provided on the bag making machine;

FIG. 4 is a schematic view of the rejecting apparatus (before the rejecting operation);

fig. 5 is a schematic view of the rejecting apparatus (in rejecting operation).

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings.

The connection means that the two mechanisms are in contact or close to each other, so that the packaging bag of the upstream mechanism can be smoothly conveyed to the downstream mechanism.

According to the invention, the removing mechanism can only comprise the pressing module, only comprise the guiding module, and simultaneously comprise the pressing module and the guiding module.

A method for removing defective packaging bags comprises the following steps:

detecting the printed film of the packaging bag, pasting a defective label 3 on the defective packaging bag, and then rolling the packaging bag, as shown in figure 1;

placing the rolled packaging bag printing film on a bag making machine 1, and unreeling to process the packaging bag as shown in fig. 2;

connecting the removing device 2 at the bag outlet end of the bag making machine 1, and detecting and identifying the flaw label on the bag making machine 1 or the removing device 2, as shown in fig. 2;

when the packaging bag with the defective label reaches the removing position of the removing device 2, the removing device 2 removes the packaging bag with the defective label.

The detection of the printed film of the packaging bag can be carried out in a printing section or a quality inspection section, and the detection is an off-line detection method.

As shown in fig. 1, during the inspection at the quality inspection section, one end of the packaging bag printed film is unwound in a roll form, the other end of the packaging bag printed film is wound in a roll form, and the visual inspection system is arranged to inspect the packaging bag printed film, and comprises an image acquisition device for photographing the packaging bag printed film and software for analyzing and judging the image. The image acquisition device acquires the pattern of the packaging bag, the software compares the acquired pattern with a preset pattern, if the acquired pattern is inconsistent with the preset pattern, such as printing defects, pollution, foreign matters, seams (caused by cutting, splicing and the like of a packaging bag printing film), and the like, the packaging bag is judged to be defective, an automatic labeling device or a manual labeling method can be arranged, and a defective label 3 can be attached to the defective packaging bag.

The defect label can be detected and identified on the bag making machine or the rejecting device through the thickness, color, conductivity, magnetism, light absorption or light reflection characteristics of the label. Although the bag making machine vibrates greatly, the requirement for detection precision of detecting and identifying defective labels is not high, so that the packaging bags with defective labels can be accurately detected and identified.

For example: as shown in fig. 3, a thickness detection device 4 is provided on the bag making machine 1 or the rejecting device to detect the identification defect label 3. The thickness detection device comprises a thickness sensor, and the thickness sensor acquires a thickness signal of the packaging bag; setting a threshold value of the thickness signal according to the thickness of the defective label; and when the thickness signal acquired by the thickness sensor reaches a set threshold value, judging that the flaw label is detected.

For example: and a thickness detection device is arranged on the bag making machine or the removing device to detect and identify the flaw label. The thickness detection device comprises a distance sensor, and the distance sensor acquires a distance signal of the surface of the packaging bag in the vertical direction; setting a threshold value of the distance signal according to the thickness of the defective label; and when the distance signal acquired by the distance sensor reaches a set threshold value, judging that the flaw label is detected.

For example: and a color detection device is arranged on the bag making machine or the removing device to detect and identify the flaw label. The color detection device comprises a color sensor, and the color sensor acquires color signals on the surface of the packaging bag; setting a threshold value of a color signal according to the color of the defective label; and when the color signal acquired by the color sensor reaches a set threshold value, judging that the defective label is detected.

For example: and a conductivity detection device is arranged on the bag making machine or the rejecting device to detect and identify the flaw label. The conductivity detection device comprises a conductivity sensor, and the conductivity sensor acquires a conductivity signal on the surface of the packaging bag; setting a threshold value of a conductance signal according to the conductivity of the defective label; and when the conductance signal acquired by the conductance sensor reaches a set threshold value, judging that the flaw label is detected.

For example: and a magnetic detection device is arranged on the bag making machine or the removing device to detect and identify the flaw labels. The magnetic detection device comprises a magnetic sensor, and the magnetic sensor acquires a magnetic signal on the surface of the packaging bag; setting a threshold value of a magnetic signal according to the magnetism of the defective label; and when the magnetic signal acquired by the magnetic sensor reaches a set threshold value, judging that the flaw label is detected.

For example: and a photoelectric detection device is arranged on the bag making machine or the removing device to detect and identify the flaw label. The photoelectric detection device comprises a photoelectric sensor, and the photoelectric sensor acquires an optical signal of the packaging bag; setting a threshold value of an optical signal according to the optical absorption or optical reflection characteristics of the defective label; and when the optical signal acquired by the photoelectric sensor reaches a set threshold value, judging that the flaw label is detected.

As shown in fig. 4 and 5, the rejecting device 2 includes a transmission mechanism 5, a rejecting channel 6 and a rejecting mechanism 7, the rejecting channel 6 includes a gap on the transmission mechanism 5, the rejecting mechanism 7 is located above the rejecting channel 6, and the rejecting mechanism 7 rejects the packaging bag downwards from the rejecting channel 6 after receiving a rejecting signal.

As a structural form of the rejecting mechanism 7, the rejecting mechanism 7 comprises a pressing module and/or a guiding module, when the rejecting mechanism 7 receives a rejecting signal, the rejecting mechanism 7 extends downwards, the guiding module guides the packaging bag to the rejecting channel 6, and the pressing module presses the packaging bag downwards towards the rejecting channel 6. The removing mechanism 7 may only include a pressing module, a guiding module, and a pressing module and a guiding module, and the guiding module and the pressing module are integrally arranged in the drawing.

The guide module needs to execute the removing action before the packaging bags with the defective labels reach the removing channel 6, and the pressing module needs to execute the removing action when the packaging bags with the defective labels reach the removing channel 6. When the bag removing machine comprises the pressing module and the guiding module, the time precision requirement of removing can be properly relaxed, and when the packaging bags with defective labels reach the removing channel 6 or reach the removing channel 6, the removing mechanism 7 receives a removing signal to perform removing action, so that removing can be completed.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.