阅读说明：本技术 一种pe塑料空瓶瓶身缺陷检测系统及其方法 (PE plastic empty bottle body defect detection system and method ) 是由 刘林杭 赵岩 牛丽萍 于 2019-11-06 设计创作，主要内容包括：本发明提供了一种PE塑料空瓶瓶身缺陷检测系统及其方法,属于机器视觉检测技术领域,用于解决检测工位过多,检测成本较高的问题。其包括工作台,工作台上固定有输送带,输送带上固定有塑料空瓶,工作台上端面设置有背光源系统和拍照系统。本PE塑料空瓶瓶身缺陷检测系统及其方法通过使用四个光源、四个相机异步拍摄,视觉成本降低,检测设备空间紧凑,设备整体成本低,可以更好的安装融入到车间使用,不必预留很大位置。(The invention provides a PE plastic empty bottle body defect detection system and a method thereof, belongs to the technical field of machine vision detection, and is used for solving the problems of excessive detection stations and high detection cost. The automatic plastic bottle taking machine comprises a workbench, wherein a conveying belt is fixed on the workbench, plastic empty bottles are fixed on the conveying belt, and a backlight source system and a photographing system are arranged on the upper end face of the workbench. According to the system and the method for detecting the defects of the empty PE plastic bottle body, the four light sources and the four cameras are used for asynchronous shooting, so that the visual cost is reduced, the space of detection equipment is compact, the overall cost of the equipment is low, the system and the method can be better installed and integrated into a workshop for use, and a large position does not need to be reserved.)

1. The utility model provides a PE plastics empty bottle body defect detecting system, includes workstation (1), its characterized in that, be fixed with conveyer belt (2) on workstation (1), placed plastics empty bottle (3) on conveyer belt (2), workstation (1) up end is provided with backlight system and camera system.

2. The PE plastic empty bottle body defect detecting system according to claim 1, wherein the backlight source system comprises a first light source (4), a second light source (5), a third light source (6) and a fourth light source (7), round holes (8) are formed in the four light sources, the first light source (4) is fixed on the end face of the workbench (1), the first light source (4) is located on one side of the conveyer belt (2), the first light source (4) forms an included angle of 135 degrees with the conveyer belt (2), the second light source (5) is fixed on the end face of the workbench (1), the second light source (5) is located on one side of the conveyer belt (2), the second light source (5) forms an included angle of 45 degrees with the conveyer belt (2), the third light source (6) is fixed on the end face of the workbench (1), the third light source (6) is located on the other side of the conveyer belt (2), and the third light source (6) is located on the conveyer belt (2) and forms, the light source four (7) is fixed on the end face of the workbench (1), the light source four (7) is located on the other side of the conveying belt (2), and an included angle of 135 degrees is formed between the light source four (7) and the conveying belt (2).

3. The PE plastic empty bottle body defect detection system as claimed in claim 2, wherein the photographing system comprises a first camera (9), a second camera (10), a third camera (11) and a fourth camera (12), lenses of the four cameras and a round hole (8) of the backlight system are coaxially arranged, the first camera (9) is fixed on the end face of the workbench (1), the first camera (9) is located on one side of the conveyer belt (2), the lens of the first camera (9) is over against the first light source (4), the second camera (10) is fixed on the end face of the workbench (1), the second camera (10) is located on one side of the conveyer belt (2), the lens of the second camera (10) is over against the second light source (5), the third camera (11) is fixed on the end face of the workbench (1), the third camera (11) is located on the other side of the conveyer belt (2), and the lens of the third camera (11) is over against the third light source (6), the camera IV (12) is fixed on the end face of the workbench (1), the camera IV (12) is located on the other side of the conveying belt (2), and a lens of the camera IV (12) is opposite to the light source IV (7).

4. The system for detecting the defects of the empty PE plastic bottle bodies as claimed in claim 3, wherein the first camera (9), the second camera (10), the third camera (11) and the fourth camera (12) are high-speed industrial cameras with a frame rate of 500 ten thousand pixels and 79.

5. The detection method using the PE plastic empty bottle body defect detection system as claimed in claim 1 is characterized by comprising the following specific steps:

the method comprises the following steps: the plastic empty bottle (3) is placed on the conveyer belt (2), the conveyer belt (2) is started, and the conveyer belt (2) conveys the plastic empty bottle (3) to a specified detection position;

step two: the method comprises the steps of lighting a first light source (4), a second light source (5), a third light source (6) and a fourth light source (7), starting a first camera (9), a second camera (10), a third camera (11) and a fourth camera (12) simultaneously, carrying out 360-degree bright field detection on a plastic empty bottle (3), and transmitting a camera shooting picture to a display screen;

step three: after the detection is finished, lightening a light source III (6) and a light source IV (7), simultaneously starting a camera I (9) and a camera II (10), carrying out 180-degree dark field backlight detection on one surface of the plastic empty bottle (3), and shooting a picture by the camera and transmitting the picture to a display screen;

step four: after the detection is finished, the first light source (4) and the second light source (5) are lightened, the third camera (11) and the fourth camera (12) are started simultaneously, 180-degree dark field backlight detection is carried out on the other surface of the plastic empty bottle (3), and the camera shoots pictures and transmits the pictures to a display screen.

Technical Field

The invention belongs to the technical field of machine vision detection, and relates to a detection system, in particular to a PE plastic empty bottle body defect detection system and a method thereof.

Background

PE transparent/non-transparent packaging products are more and more popular with consumers at present, and are widely applied to the dairy product industry, the daily article washing industry, the chemical product packaging industry and the engine oil and lubricating oil product packaging industry, and due to the production process and other reasons, abnormal defects such as black spots, foreign matters, impurities, thin walls, accumulated materials, piled materials, holes, flash and the like often occur on bottle bodies; conventional testing involves observing the sample by a person at a fixed angle next to the conveyor line.

The traditional mode uses ordinary light source to realize above function, need use eight cameras, eight light sources, three station just can accomplish above-mentioned function, not only detects the cost and rises, and the station is more moreover, and equipment will be longer, and the whole manufacturing cost of equipment increases.

Disclosure of Invention

The invention aims to provide a PE plastic empty bottle body defect detection system and a method thereof aiming at the problems in the prior art, and the device aims to solve the technical problems that: the detection stations are too many, and the detection cost is higher.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a PE plastics empty bottle body defect detecting system, includes the workstation, be fixed with the conveyer belt on the workstation, be fixed with plastics empty bottle on the conveyer belt, the workstation up end is provided with backlight system and the system of shooing.

The working principle of the invention is as follows: the backlight system and the photographing system are matched to detect defects such as black spots, foreign matters, impurities and the like. The product 360-degree bright field detection is realized.

The backlight system comprises a first light source, a second light source, a third light source and a fourth light source, round holes are formed in the four light sources, the first light source is fixed on the end face of the workbench, the first light source is located on one side of the conveying belt and forms a 135-degree included angle with the conveying belt, the second light source is fixed on the end face of the workbench and forms a 45-degree included angle with the conveying belt, the third light source is located on the other side of the conveying belt and forms a 45-degree included angle with the conveying belt, the fourth light source is fixed on the end face of the workbench and forms a four-position with the other side of.

The photographing system comprises a first camera, a second camera, a third camera and a fourth camera, lenses of the four cameras and a round hole of the backlight system are coaxially arranged, the first camera is fixed on the end face of the workbench, the first camera is located on one side of the conveying belt, the lens of the first camera is over against the first light source, the second camera is fixed on the end face of the workbench, the second camera is located on one side of the conveying belt, the lens of the second camera is over against the second light source, the third camera is fixed on the end face of the workbench, the third camera is located on the other side of the conveying belt, the lens of the third camera is over against the third light source, the fourth camera is fixed on the end face of the workbench, the fourth camera is located on the other side of.

By adopting the structure, the four backlight sources are simultaneously lighted for the first time, the four cameras are also used for shooting simultaneously, the product presents a bright-field diffuse reflection mode to detect the product defects (black spots, foreign matters and impurities), the two light sources and the two cameras opposite to the light sources are used for shooting for the second time, and the product presents a dark-field backlight mode to detect the product defects; and the remaining two light sources and two cameras opposite to the light sources are used for photographing for the third time, and the product presents a dark field backlight mode for detecting product defects (thin wall, accumulated material, piled material, holes and flash).

A detection method using a PE plastic empty bottle body defect detection system comprises the following specific steps:

the method comprises the following steps: placing the plastic empty bottles on a conveying belt, starting the conveying belt, and conveying the plastic empty bottles to a specified detection position by the conveying belt;

step two: the first light source, the second light source, the third light source and the fourth light source are lightened, the first camera, the second camera, the third camera and the fourth camera are started simultaneously, 360-degree bright field detection is carried out on the plastic empty bottle, a camera shooting picture is transmitted to a display screen, a visual system presents a surface bright field diffuse reflection mode to shoot a product, the defects of black spots, foreign matters, impurities and the like are mainly detected, and the 360-degree bright field detection of the product is realized;

step three: after the detection is finished, a third light source and a fourth light source are lightened, a first camera and a second camera are started simultaneously, 180-degree dark field backlight detection is carried out on one side of the plastic empty bottle, a camera shooting picture is transmitted to a display screen, a vision system shoots products in a dark field backlight mode, the defects of thin walls, accumulated materials, piled materials, holes, flash and the like are mainly detected, and 180-degree detection on one side of the products is realized;

step four: after the detection is finished, the first light source and the second light source are lightened, the third camera and the fourth camera are started simultaneously, 180-degree dark field backlight detection is carried out on the other surface of the plastic empty bottle, a camera shooting picture is transmitted to a display screen, a vision system shoots products in a dark field backlight mode, the defects of thin walls, accumulated materials, piled materials, holes, flashes and the like are mainly detected, and the 180-degree detection on the other surface of the products is realized.

Compared with the prior art, the PE plastic empty bottle body defect detection system and the method thereof have the following advantages:

asynchronously shooting by using four light sources and four cameras; the visual cost is reduced, the space of the detection equipment is compact, the overall cost of the equipment is low, the installation can be better integrated into a workshop for use, and a large position does not need to be reserved.

Drawings

FIG. 1 is a schematic diagram of a workstation layout of the present invention;

FIG. 2 is a schematic view of a light source according to the present invention;

FIG. 3 is a schematic diagram of the position relationship between the camera and the light source according to the present invention;

FIG. 4 is a schematic diagram of a camera trigger circuit of the present invention;

FIG. 5 is a diagram of a light source control system of the present invention;

FIG. 6 is a layout diagram of a workstation of a prior art inspection system;

in the figure: 1. a work table; 2. a conveyor belt; 3. plastic empty bottles; 4. a first light source; 5. a second light source; 6. a third light source; 7. a fourth light source; 8. a circular hole; 9. a first camera; 10. a second camera; 11. a third camera; 12. and a fourth camera.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1-5, the present embodiment provides a system and a method for detecting defects of a PE plastic empty bottle body, including a workbench 1, a conveyor belt 2 fixed on the workbench 1, a plastic empty bottle 3 fixed on the conveyor belt 2, and a backlight system and a photographing system arranged on an upper end surface of the workbench 1. The product 360-degree bright field detection is realized.

The backlight source system comprises a first light source 4, a second light source 5, a third light source 6 and a fourth light source 7, round holes 8 are formed in the four light sources, the first light source 4 is fixed on the end face of the workbench 1, the first light source 4 is located on one side of the conveying belt 2, the first light source 4 and the conveying belt 2 form a 135-degree included angle, the second light source 5 is fixed on the end face of the workbench 1, the second light source 5 is located on one side of the conveying belt 2, the second light source 5 and the conveying belt 2 form a 45-degree included angle, the third light source 6 is fixed on the end face of the workbench 1, the third light source 6 is located on the other side of the conveying belt 2, the third light source 6 is located on the conveying belt 2 and forms a 45-degree included angle, the fourth light source 7 is fixed on the end face of.

The photographing system comprises a first camera 9, a second camera 10, a third camera 11 and a fourth camera 12, lenses of the four cameras are coaxially arranged with the round hole 8 of the backlight source system, the first camera 9 is fixed on the end surface of the workbench 1, the first camera 9 is positioned on one side of the conveyer belt 2, the lens of the first camera 9 is opposite to the first light source 4, the second camera 10 is fixed on the end surface of the workbench 1, the second camera 10 is positioned on one side of the conveyer belt 2, the lens of the second camera 10 is opposite to the second light source 5, the third camera 11 is fixed on the end surface of the workbench 1, the third camera 11 is positioned on the other side of the conveyer belt 2, the lens of the third camera 11 is opposite to the third light source 6, the fourth camera 12 is fixed on the end surface of the workbench 1, the fourth camera 12 is positioned on the other side of the conveyer belt 2, and the lens of the fourth camera 12 is opposite to the fourth, the product presents a bright field diffuse reflection mode to detect product defects (black spots, foreign matters and impurities), two light sources and two cameras opposite to the light sources are adopted for photographing for the second time, and the product presents a dark field backlight mode to detect the product defects; and the remaining two light sources and two cameras opposite to the light sources are used for photographing for the third time, and the product presents a dark field backlight mode for detecting product defects (thin wall, accumulated material, piled material, holes and flash).

A detection method using a PE plastic empty bottle body defect detection system comprises the following specific steps:

the method comprises the following steps: placing the plastic empty bottle 3 on the conveyer belt 2, starting the conveyer belt 2, and conveying the plastic empty bottle 3 to a specified detection position by the conveyer belt 2;

step two: the method comprises the steps of lighting a first light source 4, a second light source 5, a third light source 6 and a fourth light source 7, starting a first camera 9, a second camera 10, a third camera 11 and a fourth camera 12 simultaneously, carrying out 360-degree bright field detection on a plastic empty bottle 3, transmitting a camera shooting picture to a display screen, shooting a product in a surface bright field diffuse reflection mode by a visual system, mainly detecting defects such as black spots, foreign matters, impurities and the like, and realizing 360-degree bright field detection on the product;

step three: after the detection is finished, the light source III 6 and the light source IV 7 are lightened, the camera I9 and the camera II 10 are started simultaneously, 180-degree dark field backlight detection is carried out on one surface of the plastic empty bottle 3, the camera shooting pictures are transmitted to a display screen, a vision system shoots products in a dark field backlight mode, and the defects of thin walls, accumulated materials, piled materials, holes, flash and the like are mainly detected. 180-degree detection on one side of the product is realized;

step four: after the detection is finished, the first light source 4 and the second light source 5 are lightened, the third camera 11 and the fourth camera 12 are started simultaneously, 180-degree dark field backlight detection is carried out on the other surface of the plastic empty bottle 3, a camera shooting picture is transmitted to a display screen, a vision system shoots a product in a dark field backlight mode, and the defects of thin walls, accumulated materials, piled materials, holes, flash and the like are mainly detected. And 180-degree detection on the other side of the product is realized.

Referring to fig. 6, the present embodiment provides a system and a method for detecting defects of a conventional PE plastic empty bottle body, which includes eight cameras and eight light sources, and the working principle of the system is that the plastic empty bottle sequentially passes through a first station, a second station and a third station along with a conveyor belt, and the detection is completed by taking a picture three times, so that not only the detection cost is increased, but also the more stations, the longer the equipment is, and the overall manufacturing cost of the equipment is increased.

The working principle of the invention is as follows: the equipment spans across a conveying belt, four opening backlight sources and four cameras are adopted, every two cameras present an included angle of 90 degrees, the light sources and the cameras are distributed vertically, the product is photographed by adopting the same station and working for three times, different light sources and cameras are triggered to work through a control circuit, the four backlight sources are simultaneously lighted for the first time, the four cameras are also simultaneously photographed, the product presents a bright field diffuse reflection mode to detect product defects (black spots, foreign matters and impurities), the two cameras opposite to the two light sources and the light sources are used for photographing for the second time, and the product presents a dark field backlight mode to detect the product defects; the third time, the remaining two light sources and two cameras opposite to the light sources are adopted for photographing, and the product presents a dark field backlight mode to detect the defects of the product (thin wall, accumulated material, piled material, holes and flash)

The camera triggering principle: the trigger line is triger + and triger-, for realizing twice same camera trigger signal of different time sequence signal control, even need guarantee when two signals get into the camera simultaneously, guarantee that the camera is according to the income preface moment of electric current, only accept a trigger signal, guarantee that the direction of the good electric current of mode control that the chronogenesis needed leading-in diode wiring under the normal condition, IO00 is shooing for the first time, IO01 is shooing for the second time, IO02 is shooing for the third time, so that the camera can judge the present trigger signal that is the several times.

The control mode of the light source controller is as follows: each controller has four outputs, each of which controls an apertured backlight.

In conclusion, by using four light sources, four cameras capture asynchronously; the visual cost is reduced, the space of the detection equipment is compact, the overall cost of the equipment is low, the installation can be better integrated into a workshop for use, and a large position does not need to be reserved.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.