Shadowless black box device for packaging bag surface detection

Abstract

The invention discloses a packaging bag surface detection shadowless black box device which comprises a box body, the box body is made of a light-proof material, an inlet is formed in the side wall of the front end of the box body, and an outlet is formed in the side wall of the rear end of the box body, so that a conveying belt and a to-be-detected packaging bag located on the conveying belt can penetrate through the box body along the inlet and the outlet; the inner wall surface of the box body has a light reflecting function; photographing holes are formed in the left side wall, the right side wall and the top surface of the box body, and industrial cameras for photographing packaging bags on the conveying belt in the box body are mounted at the photographing holes, the inlet and the outlet; the illuminating lamps are fixedly connected to the bottom of the inner left side and the bottom of the inner right side of the box body respectively, so that the illuminating lamps are arranged on the left side and the right side of the conveying belt, the device is simple in structure, a light source cannot form light spots on the surface of a to-be-detected packaging bag, and the imaging effect is good.

Description

Technical Field

[0001] The invention relates to the field of surface quality detection equipment, in particular to a shadowless black box device for packaging bag surface detection. Background Art

[0002] Surface quality inspection of packaging bags, such as tissue paper, sanitary napkin and other packaging bags. After the packaging bags are filled and sealed, it is necessary to inspect the seals of the packaging bags and the surface printed patterns to prevent products with loose seals or incorrect printed patterns from entering the market.

[0003] Currently, surface inspection of such packaging bags is usually carried out in a box in a dark environment. A conveyor belt is provided in the box that runs through the front and rear ends of the box. Light sources are provided on both sides of the conveyor belt in the box to illuminate the packaging bags on the conveyor belt. Multiple industrial cameras are fixedly connected in the box to take pictures of each side of the packaging bag.

[0004] The above-mentioned equipment is a conventional equipment in this field, and the equipment has the following shortcomings: first, it is necessary to adjust the irradiation direction of the light source for different packaging bags so that the industrial camera can obtain the best imaging; second, in order to avoid the formation of light spots when the light source irradiates on the surface of the packaging bag, it is necessary to add a polarizer in front of the light source. When changing packaging bags of different sizes, it is still necessary to adjust the position and angle of the light source and the polarizer to avoid the formation of light spots on the surface of the packaging bag.

[0005] Although polarizing films are added to the light source, it is inevitable that large and small light spots will form on the surface of packaging bags made of materials with good reflective effects, resulting in poor final imaging effects and affecting the detection effect. At the same time, when testing packaging bags of different sizes, the light source angle needs to be adjusted, which is time-consuming and labor-intensive, and it is impossible to achieve a result without light spots. In addition, the light sources need to be arranged on both sides of the conveyor belt. In order to ensure sufficient lighting effects (the light intensity of a single light source cannot be too high), a large number of light sources are required to eliminate shadows and illuminate various parts of the packaging bag. The arrangement of the light sources takes up a large space, resulting in an increase in the volume of the entire equipment. Summary of the invention

[0006] In view of this, it is necessary to provide a shadowless black box device for detecting the surface of a packaging bag with a simple structure, no light spots on the surface of the packaging bag, and good imaging effect.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: a shadowless black box device for packaging bag surface detection, comprising:

[0008] A box body, wherein the box body is made of an opaque material, the front side wall of the box body has an entrance, and the rear side wall of the box body has an exit, so that the conveyor belt and the packaging bags to be detected on the conveyor belt can pass through the box body along the entrance and the exit, and the inner wall surface of the box body has a reflective function; the left side wall, the right side wall and the top surface of the box body are all provided with photographic holes, and the photographic holes, the entrance and the exit are all equipped with industrial cameras for photographing the packaging bags on the conveyor belt in the box body;

[0009] The lighting fixtures are respectively fixedly connected to the left bottom and the right bottom of the box body, so that the left and right sides of the conveyor belt are provided with the lighting fixtures; the lighting fixtures are arranged upwards so that the light emitted by the lighting fixtures is irradiated upwards onto the inner wall surface of the box body, and the light is diffusely reflected by the inner wall surface and illuminates the entire internal space of the box body.

[0010] Furthermore, the inner wall of the box is coated with a nano-reflective coating.

[0011] Furthermore, the lighting fixture is lower than the top surface of the conveyor belt so that the light emitted by the lighting fixture will not directly shine on the surface of the packaging bag.

[0012] Furthermore, the box and the conveyor belt are both fixedly connected to a machine platform, and the lighting fixture is located on the bottom surface of the box, so that the light emitted by the lighting fixture will not directly shine on the industrial cameras located at the exit and the entrance.

[0013] Furthermore, the lighting fixture is an LED light strip, and the lighting fixture is the same length as the box.

[0014] Furthermore, the camera holes on the left and right walls of the box are higher than the top surface of the conveyor belt, so that the light emitted by the lighting fixture will not directly hit the industrial camera at the camera holes on the left and right walls of the box.

[0015] Furthermore, the machine platform has a light-proof outer shell that covers the conveyor belt and the box.

[0016] Furthermore, the camera hole on the top surface of the box is located above the middle of the conveyor belt, so that the light emitted by the lighting fixture will not directly hit the industrial camera located at the camera hole on the top surface of the box.

[0017] Furthermore, a downward-facing backlight is provided on the top of one end of the box body, and the backlight is located directly above the connection between the two conveyor belts. An industrial camera for photographing the bottom surface of the packaging bag is provided below the connection.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the device sets a box on the conveyor belt, and the light from the light source in the box illuminates the entire box through diffuse reflection, and then illuminates the surface of the packaging bag. The disordered diffuse reflected light illuminates various positions of the packaging bag without forming a shadow or a light spot on the surface of the packaging bag, thereby obtaining the best imaging effect and ensuring the accuracy of detection.

[0019] In order to make the above and other purposes, features and advantages of the present invention more clearly understood, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a stereogram of an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the use status of an embodiment of the present invention.

[0022] In the figure: 1-box, 11-entrance, 12-exit, 13-photographic holes on the left and right walls of the box, 14-photographic holes on the top surface of the box, 2-lighting fixture, 3-conveyor belt, 4-industrial camera, 5-second box, 51-backlight fixture. DETAILED DESCRIPTION

[0023] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0024] like Figure 1 As shown, a shadowless black box device for packaging bag surface detection includes: a box body 1 and a lighting fixture 2.

[0025] The box body 1 is made of an opaque material (such as aluminum alloy, plastic, etc.); the front end side wall of the box body 1 has an entrance 11, and the rear end side wall of the box body 1 has an exit 12, and the conveyor belt 3 and the packaging bags to be inspected on the conveyor belt can pass through the box body 1 along the entrance 11 and the exit 12; the left and right side walls of the box body 1 each have a photographic hole 13, and the top surface of the box body 1 has a photographic hole 14, and the photographic hole, entrance and exit are all equipped with an industrial camera 4 for photographing the packaging bags on the conveyor belt in the box.

[0026] The inner wall surface of the box body 1 has a reflective function. In this embodiment, the inner wall surface of the box body 1 is coated with a nano-reflective coating so that the light from the light source can be diffusely reflected on the nano-reflective coating.

[0027] The lighting fixtures 2 are fixedly connected to the bottom of the left side and the bottom of the right side of the box 1, respectively, so that there are lighting fixtures 2 on both sides of the conveyor belt 3; the lighting fixtures 2 are arranged upward, so that the light emitted by the lighting fixtures 2 is irradiated upward on the inner wall surface of the box 1, and the light is diffusely reflected by the inner wall surface and illuminates the entire internal space of the box 1. In this way, it is ensured that all positions of the packaging bags on the conveyor belt in the box 1 are illuminated, and the packaging bags will not form shadows under the irradiation of diffusely reflected light, and no light spots will be formed on the surface of the packaging bags.

[0028] In this embodiment, the lighting fixture 2 is an LED light strip, and the lighting fixture 2 is the same length as the box 1 .

[0029] In order to prevent the light of the lighting fixture 2 from directly shining on the surface of the packaging bag to form a light spot, the lighting fixture 2 is arranged below the top surface of the conveyor belt 3 so that the light of the lighting fixture 2 directed toward the packaging bag is blocked by the side wall of the conveyor belt. At the same time, in order to further prevent the light of the lighting fixture 2 from directly shining on the industrial cameras located at the entrance and exit of the box, resulting in exposure in the imaging, the installation position of the lighting fixture 2 should be lower, that is, the box and the conveyor belt are fixedly connected to a machine platform, and the lighting fixture is located on the bottom surface of the box, so that the light emitted by the lighting fixture will not directly shine on the industrial cameras located at the entrance and exit.

[0030] In this embodiment, the camera holes 13 located on the left and right walls of the box are higher than the top surface of the conveyor belt, and the camera hole 14 on the top surface of the box is located above the middle of the conveyor belt; so that the light emitted by the lighting fixture will not directly shine on the industrial camera located at the camera holes on the left and right walls of the box, and the industrial camera located at the camera holes on the top surface of the box.

[0031] In this embodiment, the machine has an opaque outer shell (not shown in the figure) that covers the conveyor belt and the box, and the interior of the outer shell constitutes a dark environment, further ensuring that the box is not affected by external light; the outer shell has a channel for the conveyor belt and the packaging bags on the conveyor belt to enter and exit.

[0032] The device sets light sources on the bottom surfaces of both sides of the box. The light from the light sources is diffusely reflected by the inner wall of the box to illuminate the inside of the box, so that there will be no shadows or light spots on the surface of the packaging bag to be inspected in the box, and the light from the light source will not directly shine on the surface of the packaging bag and the industrial camera, further avoiding the formation of light spots and exposure of imaging, ensuring imaging quality and detection accuracy.

[0033] The device can be used for packaging bags of any external size. There is no need to adjust the angle and position of the light source when detecting packaging bags of different sizes. The device can be used directly after being assembled as a prefabricated part without the need for subsequent debugging, and has wide applicability.

[0034] like Figure 2As shown, it is a schematic diagram of the use state of the device. In some specific scenarios, it is also necessary to detect the bottom surface of the packaging bag, so two conveyor belts are required. There is a gap between the two conveyor belts, and the gap can allow the packaging bag to cross safely. At the same time, an industrial camera is installed at the bottom of the gap. In order to provide a light source for the bottom surface, two boxes are designed in this use state. One box is the box mentioned above, and the other box is a second box 5. The top of one end of the second box 5 has a backlight fixture 51 facing downwards. The backlight fixture 51 is located directly above the gap between the two conveyor belts. The left and right side walls of the second box do not have camera holes, but there are lighting fixtures at the bottom of the left and right sides inside.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A shadowless black box device for packaging bag surface detection, characterized in that: include: A box body, wherein the box body is made of an opaque material, the front side wall of the box body has an entrance, and the rear side wall of the box body has an exit, so that the conveyor belt and the packaging bags to be detected on the conveyor belt can pass through the box body along the entrance and the exit, and the inner wall surface of the box body has a reflective function; the left side wall, the right side wall and the top surface of the box body are all provided with photographic holes, and the photographic holes, the entrance and the exit are all equipped with industrial cameras for photographing the packaging bags on the conveyor belt in the box body; The lighting fixtures are respectively fixedly connected to the left bottom and the right bottom of the box body, so that the left and right sides of the conveyor belt are provided with the lighting fixtures; the lighting fixtures are arranged upwards so that the light emitted by the lighting fixtures is irradiated upwards onto the inner wall surface of the box body, and the light is diffusely reflected by the inner wall surface and illuminates the entire internal space of the box body.

2. The shadowless black box device for packaging bag surface detection according to claim 1, characterized in that: The inner wall surface of the box is coated with a nano reflective coating.

3. The shadowless black box device for packaging bag surface detection according to claim 1, characterized in that: The lighting fixture is lower than the top surface of the conveyor belt so that the light emitted by the lighting fixture will not directly hit the surface of the packaging bag.

4. The shadowless black box device for packaging bag surface detection according to claim 3 is characterized in that: The box body and the conveyor belt are both fixedly connected to a machine platform, and the lighting fixture is located on the bottom surface of the box body, so that the light emitted by the lighting fixture will not directly shine on the industrial cameras located at the exit and the entrance.

5. The shadowless black box device for packaging bag surface detection according to claim 1, characterized in that: The lighting fixture is an LED light strip, and the lighting fixture is as long as the box.

6. The shadowless black box device for packaging bag surface detection according to claim 1, characterized in that: The camera holes on the left and right walls of the box are higher than the top surface of the conveyor belt, so that the light emitted by the lighting fixture will not directly hit the industrial camera at the camera holes on the left and right walls of the box.

7. The shadowless black box device for packaging bag surface detection according to claim 4, characterized in that: The machine platform is provided with an opaque outer shell which covers the conveyor belt and the box.

8. The shadowless black box device for packaging bag surface detection according to claim 1, characterized in that: The camera hole on the top surface of the box is located above the middle of the conveyor belt, so that the light emitted by the lighting fixture will not directly hit the industrial camera located at the camera hole on the top surface of the box.

9. The shadowless black box device for packaging bag surface detection according to claim 1, characterized in that: A downward-facing backlight is provided on the top of one end of the box body. The backlight is located directly above the connection between the two conveyor belts. An industrial camera for photographing the bottom surface of the packaging bag is provided below the connection.

Images