CN115400959A - Machine vision-specific defect detection and sorting system for plastic parts with flip function - Google Patents

Abstract

The invention is suitable for the technical field of plastic piece sorting, and provides a machine vision specific plastic piece defect detecting and sorting system with a turning function, which comprises specific plastic pieces and a conveyor belt module; an illumination photographing module; the clamping and overturning device is electrically connected with the lighting and photographing module; the image acquisition module is electrically connected with the illumination photographing module; the PC is electrically connected with the image acquisition module; the sorting module is electrically connected with the PC. The invention solves the problems of high labor cost, low sorting efficiency, poor detection quality and the like in the existing manual sorting detection. The invention realizes the defect detection of the surfaces of the specific plastic piece except the bottom, so that the defect detection of the specific plastic piece is more comprehensive and the defect detection quality is higher. The surface defect detection of the specific plastic part is effectively realized. Simple structure, convenient operation and lower cost.

Description

Machine vision-specific defect detection and sorting system for plastic parts with flip function

technical field

The invention belongs to the technical field of sorting and detection of plastic parts, and in particular relates to a defect detection and sorting system for specific plastic parts of machine vision with a flipping function.

Background technique

There are many kinds of takeaway boxes on the market today, and as a representative of non-standard plastic parts - plastic takeaway boxes are better suitable for a variety of foods due to their outstanding sealing and oil resistance performance, so plastics stand out among many materials. There are many kinds of plastic takeaway boxes, and their sorting and testing mainly rely on manual work. However, manual sorting and testing has problems such as high labor costs, low sorting efficiency, and poor testing quality. In addition, at present, in domestic universities and research institutes, more studies are being made on the classification of different plastic materials through near-infrared hyperspectral image matching and then the establishment of classification models to achieve classification, but most of them stay at the theoretical point of view and lack of practice. Therefore, the research on automatic sorting and detection system for plastic parts has important practical significance.

Contents of the invention

The present invention provides a defect detection and sorting system for specific plastic parts with machine vision and a flipping function, aiming to solve the above-mentioned problems in the background technology.

The present invention is achieved in this way, the defect detection and sorting system for specific plastic parts of machine vision with flipping function, including specific plastic parts, also includes:

a conveyor belt module for conveying the particular plastic part;

an illumination camera module, the illumination camera module collects the surface image of the specific plastic part;

Clamping and turning device, the clamping and turning device is electrically connected with the lighting camera module, and is used to cooperate with the lighting camera module to clamp and turn the specific plastic part to change the surface position of the specific plastic part, so that the The lighting camera module collects the surface image of the specific plastic part;

An image acquisition module, the image acquisition module is electrically connected to the lighting camera module, and is used to convert the image analog signal captured by the lighting camera module into a digital signal that is easy to process;

a PC, the PC is electrically connected to the image acquisition module, and is used to process the surface image of the specific plastic part collected by the lighting and photographing module according to the digital signal transmitted by the image acquisition module; defect detection;

A sorting module, the sorting module is electromechanically connected with the PC, and is used for sorting the specific plastic parts with defects according to the detection results transmitted by the PC.

Preferably, the conveyor belt module is photographed by a CCD camera, and a ring-shaped LED light is used as an illumination source.

Preferably, the clamping and turning device includes a carrying module, a turning module arranged on the carrying module, and a clamping module arranged on the turning module.

Preferably, the flipping module has the functions of flipping 90° to the front, 90° to the rear, 90° to the left, and 90° to the right.

Preferably, the clamping and turning devices are correspondingly arranged on the conveyor belt module, and the number of the clamping and turning devices is consistent with the number of the specific plastic parts.

Preferably, the PC includes an image enhancement module, an image denoising module, a standard qualified library module, and a defect detection module.

Preferably, the image enhancement module modifies the gray value of the image through linear operation to perform gray scale transformation.

Preferably, the image denoising module denoises the image through weighted mean.

Preferably, the defect detection module compares the standard-qualified non-defective image in the standard-qualified library module with the image to be detected obtained after the image denoising module to detect defects, and if a defective image is found, the to mark.

Preferably, the sorting module is specifically a sorting robot arm.

Compared with the prior art, the beneficial effect of the present invention is: the machine vision specific plastic part defect detection and sorting system with the flip function of the present invention,

1. The present invention solves the problems of high labor cost, low sorting efficiency and poor detection quality existing in the existing manual sorting and detection.

2. The present invention enables specific plastic parts to be rotated through the provided clamping and flipping device, and realizes defect detection on the surface of the specific plastic part except the bottom, so that the defect detection of the specific plastic part is more comprehensive and the defect detection Higher quality.

3. The present invention effectively realizes the detection of surface defects of specific plastic parts through machine vision technology and image detection technology.

4. The present invention adopts an integrated and modular design, so that the structure is simple, the operation is convenient, and the cost is low.

Description of drawings

Fig. 1 is a structural block diagram of the present invention;

Fig. 2 is the structural block diagram of clamping and turning device among the present invention;

Fig. 3 is the structural block diagram of PC among the present invention.

In the picture:

1. Specific plastic parts;

2. Conveyor belt module;

3. Lighting camera module;

4. Clamping and turning device; 41. Carrying module; 42. Turning module; 43. Clamping module;

5. Image acquisition module;

6. PC; 61. Image enhancement module; 62. Image denoising module; 63. Standard qualified library module; 64. Defect detection module;

7. Sorting module.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to Figures 1-3, the present invention provides a technical solution: machine vision specific plastic defect detection and sorting system with flip function, including specific plastic parts 1, conveyor belt module 2, lighting camera module 3, clamping and flipping device 4. Image acquisition module 5, PC 6, sorting module 7.

There are several specific plastic parts 1 , and the conveyor belt module 2 is used to transport the specific plastic parts 1 . The start-stop and speed parameters of the conveyor belt module 2 can be operated and set on the PC 6 . The lighting and photographing module 3 is used to collect the surface image of the specific plastic part 1, and the clamping and turning device 4 is electrically connected to the lighting and photographing module 3, and is used to cooperate with the lighting and photographing module 3 to clamp and turn the The specific plastic part 1 changes the surface position of the specific plastic part 1, so that the lighting and photographing module 3 collects the surface image of the specific plastic part 1. The image acquisition module 5 is electrically connected with the illumination camera module 3, and is used for converting the image analog signal captured by the illumination camera module 3 into a digital signal for processing. The PC 6 is electrically connected to the image acquisition module 5, and is used for performing the surface image of the specific plastic part 1 collected by the illumination camera module 3 according to the digital signal transmitted by the image acquisition module 5. processing and defect detection. The sorting module 7 is electrically connected with the PC 6 and is used for sorting the specific plastic parts 1 with defects according to the detection results transmitted by the PC 6 .

As a further improvement of this embodiment, specifically, the lighting and photographing module 3 adopts a CCD camera to take pictures, and adopts a ring-shaped LED lamp as a lighting source.

As a further improvement of this embodiment, the clamping and turning device 4 includes a carrying module 41 , a turning module 42 arranged on the carrying module 41 , and a clamping module 43 arranged on the turning module 42 . The clamping module 43 can clamp the bottom of the specific plastic part 1, and the overturning module 42 can drive the clamping module 43 clamping the specific plastic part 1 to overturn around the carrying module 41 , so that the other surfaces of the specific plastic part 1 face upwards sequentially except for the bottom, so that the illumination camera module 3 can take pictures.

More specifically, the carrying modules 41 in the clamping and turning device 4 are correspondingly arranged on the conveyor belt module 2 , and the number of the clamping and turning devices 4 is consistent with the number of the specific plastic parts 1 .

More specifically, the flipping module 42 has the functions of flipping 90° to the front, 90° to the rear, 90° to the left, and 90° to the right.

More specifically, the bearing module 41 can be a bearing seat or a bearing plate, which can be fixed and installed on the conveyor belt module 2 by bolts or screws; The mounting plate and the flipping cylinders correspondingly connected around the bottom of the mounting plate. When flipping, the two flipping cylinders on the same side are simultaneously pulled down and lifted, so that the mounting plate is flipped with the ball hinge point as the rotation center. The clamping module 43 may be a clamping plate with a clamping cylinder.

As a further improvement of this embodiment, the PC 6 includes an image enhancement module 61 , an image denoising module 62 , a standard qualified library module 63 , and a defect detection module 64 . The standard qualified library module 63 contains images of standard and non-defective specific plastic parts 1, and the collected images can be detected by comparing the collected images with the standard images in the standard qualified library module 63. Whether the image is defective.

Specifically, the image enhancement module 61 modifies the grayscale value of the image through linear operations to perform grayscale transformation. Next, according to the comparison between the gray value of the specific plastic part 1 to be tested and the gray value of the surrounding background, the image is grayscale processed, and a threshold is set to determine whether the pixel in the image belongs to the specific plastic part 1 to be tested .

Specifically, the image denoising module 62 processes and denoises the image through a weighted mean value. Set a window for the template pixels on the image, the window is square or rectangular, the window includes the pixels adjacent to the target pixel, and the target pixel is centered by calculating the average value of all pixels in the window row by row or column by row to replace the original pixel value, keeping the window Shape and size, each pixel in the original image is used as the center pixel and replaced with the average value one by one.

Specifically, the defect detection module 64 compares the standard qualified non-defective image in the standard qualified library module 63 with the image to be detected obtained after the image denoising module 62 to detect defects, such as finding a defective image , to mark it.

As a further improvement of this embodiment, the sorting module 7 is specifically a sorting robot arm, and the sorting robot arm is controlled by the signal of the PC 6, and the sorting operation process of the sorting module 7 can be performed on the PC 6 .

Principle of work of the present invention and use process:

During use, the specific plastic part 1 to be tested is placed on the clamping module 43 in the clamping turning device 4, the bottom of the specific plastic part 1 is clamped by the clamping module 43, and the specific plastic part 1 is fixed. Set the transmission speed of the conveyor belt module 2 on the PC and start the conveyor belt module 2. After the clamping and turning device 4 with the specific plastic part 1 is sent to the lighting and photographing module 3 station, the conveyor belt module 2 pauses, and the lighting and photographing module 3 cooperates with the clamping The overturning of the overturning device 4 takes pictures of the other surfaces of the specific plastic part 1 except the bottom surface. After the lighting and photographing module 3 takes pictures, the obtained image analog voltage signal is transmitted to the image acquisition module 5, and the image acquisition module 5 converts it It is a digital signal, and then the digital signal corresponding to the specific plastic part 1 to be tested is transmitted to the PC 6. After the PC 6 performs image enhancement and image denoising on the received digital signal, the defect detection module 64 compares the processed image with the The standard-qualified non-defective images in the standard qualified library module 63 are compared, and if a defective image is found, it is marked, and then the PC 6 sends the marked defective image information and corresponding control instructions to the sorting module 7, the sorting module 7 sorts the defective specific plastic parts 1 according to the marked defective image information and the corresponding control instructions. During sorting, the clamping module 43 will loosen the grip on the specific plastic parts 1 clamping.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. Machine vision specific plastic part defect detecting and sorting system with overturning function comprises specific plastic parts (1), and is characterized in that: further comprising:

a conveyor belt module (2), said conveyor belt module (2) being adapted to convey said specific plastic part (1);

the lighting photographing module (3), the lighting photographing module (3) is used for collecting the surface image of the specific plastic part (1);

the clamping and overturning device (4) is electrically connected with the illumination photographing module (3) and is used for matching with the illumination photographing module (3) to clamp and overturn the specific plastic part (1) to change the surface position of the specific plastic part (1), so that the illumination photographing module (3) collects the surface image of the specific plastic part (1);

the image acquisition module (5) is electrically connected with the illumination photographing module (3) and is used for converting an image analog signal shot by the illumination photographing module (3) into a digital signal convenient for processing;

the PC (6) is electrically connected with the image acquisition module (5) and is used for processing and detecting the defects of the surface image of the specific plastic part (1) acquired by the illumination photographing module (3) according to the digital signal transmitted by the image acquisition module (5);

the sorting module (7) is electrically connected with the PC (6) and is used for sorting the specific plastic parts (1) with defects according to the detection result transmitted by the PC (6).

2. The machine vision specific plastic part defect inspection and sorting system with flipping capability of claim 1, further comprising: the illumination photographing module (3) adopts a CCD camera to photograph and adopts an annular LED lamp as an illumination light source.

3. The machine vision specific plastic part defect inspection and sorting system with flipping capability of claim 1, further comprising: the clamping and overturning device (4) comprises a bearing module (41), an overturning module (42) arranged on the bearing module (41), and a clamping module (43) arranged on the overturning module (42).

4. The machine-vision, specific plastic part defect detecting and sorting system of claim 3, wherein: the overturning module (42) has the functions of overturning by 90 degrees to the front side, overturning by 90 degrees to the rear side, overturning by 90 degrees to the left side and overturning by 90 degrees to the right side respectively.

5. The machine-vision, specific plastic part defect detecting and sorting system of claim 3, wherein: the clamping and overturning device (4) is correspondingly arranged on the conveyor belt module (2), and the clamping and overturning device (4) is provided with a plurality of plastic parts which are consistent with the specific plastic parts (1).

6. The machine vision specific plastic part defect inspection and sorting system with flipping capability of claim 1, further comprising: the PC (6) comprises an image enhancement module (61), an image denoising module (62), a standard qualified library module (63) and a defect detection module (64).

7. The machine vision specific plastic part defect inspection and sorting system with flipping function of claim 6 further comprising: the image enhancement module (61) modifies the gray value of the image through linear operation to carry out gray level transformation.

8. The machine vision specific plastic part defect inspection and sorting system with flipping function of claim 6 further comprising: the image denoising module (62) processes and denoises the image through the weighted mean value.

9. The machine vision specific plastic part defect inspection and sorting system with flipping function of claim 6 further comprising: and the defect detection module (64) compares the standard qualified defect-free image in the standard qualified library module (63) with the image to be detected obtained after the image denoising module (62) to detect defects, and marks the defective image if the defective image is found.

10. The machine vision specific plastic part defect inspection and sorting system with flipping capability of claim 1, further comprising: the sorting module (7) is specifically a sorting mechanical arm.

Images