CN220983032U - Particulate matter outward appearance detection device based on machine vision - Google Patents
Particulate matter outward appearance detection device based on machine vision Download PDFInfo
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Abstract
The utility model provides a particulate matter outward appearance detection device based on machine vision, this system forms the route that two particulate matters freely fall through first hopper, first transport mechanism, second hopper, second transport mechanism, material collector, shoots the image that is used for special-shaped detection through first camera, shoots the color image that is used for the heterochrosis detection through second camera, the third camera that stagger relatively and set up, carries out analysis, processing, statistics to the image through detecting system, obtains the testing result of heterochrosis. The special-shaped heterochromatic detection is carried out by the particle appearance detection device, so that subjectivity and difference of manual operation can be reduced, and the detection accuracy and repeatability are improved; the problem of visual fatigue of the detection personnel, which is frequently existing at present, is avoided; reduces the cost of manual operation and time, and greatly improves the effect of detecting the particulate matters.
Description
Technical Field
The application relates to the technical field of detection, in particular to a particulate matter appearance detection device based on machine vision.
Background
The thermoplastic granular resin has the characteristics of better mechanical property and chemical corrosion resistance, higher service temperature, high strength and hardness, mechanical property (excellent fracture toughness and damage tolerance), excellent fatigue resistance, capability of molding complex geometric shapes and structures, adjustable thermal conductivity, recoverability, good stability in severe environment, repeated molding, welding, repairing and the like. Therefore, the thermoplastic particulate resin is widely used in aspects of human life and work.
In practical applications, thermoplastic granular resins are often displayed in front of users in direct natural color, and detection and screening of the resin granules is a necessary option in order to reduce the content of impurities in the granules and improve the yield of the granules.
The petrochemical industry has strict standard requirements on the appearance quality of plastic particles. Currently, the main method of verifying the appearance properties of products still relies on manual visual inspection. According to the petrochemical industry standard SH/T1541.1-2019 plastic particle appearance test method part 1: in the visual inspection method (hereinafter, abbreviated as 1541 standard), a manual visual inspection method is mainly used as a test means. The test method carries out classification definition on the appearance of the defect:
1. Black particles: the visible part of the whole particle is black or dark brown particle;
2. black speck particles: in addition to the black particles, particles of black or dark brown speckles are visually visible;
3. And (3) color particles: particles of a color other than black particles, black specks, and the color to which the resin should be;
4. large particles: screen residue particles with the size of more than 5mm, and various types of continuous particles and elongated particles with two or more particles adhered;
5. And (3) small particles: screen reject particles of less than 2mm in size, including chips and nibs;
6. Snake skin particles: a snake skin-like ribbon resin;
7. Tailing particles: particles with cone angles or burrs caused by poor dicing;
8. Floc: cotton-like, fiber-like or ribbon-like resin having a certain width.
Further, the above plastic particle appearance defects can be classified into three main categories:
1. Different colors: black particles, black specks, colored particles, i.e., particles of a color other than the color to which the resin should be colored;
2. Size class: large, small, i.e. plastic granules with a sieving size of more than 5mm and less than 2 mm;
3. Shape class: snake skin particles, tailing particles and floccules, namely abnormal shapes of plastic particles outside the original appearance.
In addition to the classification definition, the 1541 standard requires: "1000 g of the resin pellets were screened out of the large and small pellets specified in the definition by a pilot screen. Thereafter, at most, 1000g of other types of particles in the pellets were sorted out with tweezers in a period of 10 minutes, and the sorting was counted (the weight of 1 plastic particle was about 0.025g, and the number of 1000g plastic particles was about 4 ten thousand) ".
However, the testing procedure using the artificial visual method has some disadvantages. According to the 1541 standard, 4 tens of thousands of plastic particles are inspected within 10 minutes and various abnormal particles are selected therefrom, which requires high attention and visual judgment of the operator. However, the manual visual method is easily affected by problems such as subjectivity, operator-to-operator variability, and fatigue caused by long-time visual, so that the accuracy and repeatability of the test results are difficult to ensure.
Disclosure of utility model
The specification provides a particulate matter outward appearance detection device based on machine vision to solve the relatively poor problem of accuracy and repeatability of current particulate matter detection method.
To solve the above technical problem, a first aspect of the present disclosure provides a particulate matter appearance detection device based on machine vision, including: the first hopper is used for receiving the particles to be detected; the first conveying mechanism is positioned below the first hopper and is used for conveying the particles falling in the first hopper to the upper part of the second hopper and enabling the particles to freely fall into the second hopper above the second hopper; a second hopper disposed below the first conveying mechanism for collecting particulate matters falling from the first conveying mechanism; the second conveying mechanism is positioned below the second hopper and is used for conveying the particles falling in the second hopper to the position above the material collector and enabling the particles to freely fall into the material collector above the material collector; a material collector arranged below the second conveying mechanism and used for collecting particles falling from the second conveying mechanism; the first camera is used for detecting abnormal shapes, is arranged between the first conveying mechanism and the second hopper, is provided with a light source, and is used for shooting images of particles freely falling from the first conveying mechanism; the first camera is a linear array scanning camera; the second camera and the third camera for detecting the different colors are arranged between the second conveying mechanism and the material collector; the second camera and the third camera are oppositely arranged at two sides of the free falling path of the particles, are staggered in the direction of the free falling path of the particles, and are respectively provided with a light source; the second camera and the third camera are used for shooting images of the particles from two sides of the free-falling particles respectively; the second camera and the third camera are color linear array scanning cameras; the detection system is connected with the first camera, the second camera and the third camera; the detection system is used for receiving images shot by the first camera, the second camera and the third camera, analyzing and processing statistical data and displaying detection results; and the control system is used for controlling the operation of equipment in the particulate matter appearance detection device.
The present utility model is not particularly limited as to whether the first camera for the profile detection is a black-and-white camera or a color camera, as long as it is a line scan camera, but the present utility model particularly recommends the use of a black-and-white camera. In some embodiments, the first camera is a black and white line scan camera.
The black-and-white camera can save computing resources and improve the abnormal detection rate under the condition of consuming minimum resources. Under the same configuration, the black-and-white camera can provide detection efficiency according to the special shape, and the special shape detection result can be obtained more quickly.
In some embodiments, the first camera for profile detection is provided with a backlight source to enable the first camera to take the particulate matter in backlight; the control system controls the on-off state and/or brightness of the backlight source.
The backlight source is adopted to supplement light on one hand, and the outline characteristics of the particles can be highlighted on the other hand, so that the accuracy of special-shaped detection is improved.
The second camera and the third camera for detecting the different colors are respectively provided with a diffuse reflection light source, and the diffuse reflection light sources are used for shooting particles; the control system controls the on-off state and/or brightness of the different diffuse reflection light sources respectively.
The transmission mode of the present utility model is not particularly limited, and in some embodiments, the first conveying mechanism and/or the second conveying mechanism may be a vibrating table or a conveyor belt.
The utility model is not particularly limited in the form of a control system, and the control of instruments and meters and the control of computers can be realized as long as the operation of equipment in the particulate matter appearance detection device can be controlled. The equipment in the particle appearance detection device can be a transmission mechanism, a camera, a light source, a computer and the like.
The present utility model is not particularly limited to a detection system for receiving images photographed by the first, second, and third cameras, analyzing and processing statistical data according to image data, and finally counting the situations of large particles, small particles, snake skin particles, tailing particles, floccules, black particles, black speckles, and color particles, displaying detection results, and generally, mainly, a computer and a printing device having software for data processing installed therein.
In some embodiments, the particulate matter appearance detection device further comprises: the weighing sensor is arranged below the material collector and connected with the detection system, and is used for detecting the total weight of the particles collected in the material collector; the weighing sensor is controlled by the control system to start and close, and data is transmitted to the detection system.
In some embodiments, the particulate matter appearance detection device further comprises: the first removing mechanism is arranged between the first camera and the second hopper; the first removing mechanism is connected with the detection system and the control system, and the control system is used for removing the special-shaped particles according to the identification result of the detection system.
In some embodiments, the particulate matter appearance detection device further comprises: the second removing mechanism is arranged between the second camera and the material collector and/or between the third camera and the material collector; the second removing mechanism is connected with the detection system and the control system, and the control system is used for removing the heterochromatic particles according to the identification result of the detection system.
The particulate matter outward appearance detection device based on machine vision that this specification provided is used for the dysmorphism to detect through first camera shooting, and through the second camera of relative staggered setting, third camera shooting be used for the color image of heterochrosis detection, carry out analysis, processing, statistics to the image through detecting system, obtain the testing result of dysmorphism heterochrosis. The special-shaped heterochromatic detection is carried out by the particle appearance detection device, so that subjectivity and difference of manual operation can be reduced, and the detection accuracy and repeatability are improved; the problem of visual fatigue of the detection personnel, which is frequently existing at present, is avoided; reduces the cost of manual operation and time, and greatly improves the effect of detecting the particulate matters.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some of the embodiments described in the application, and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic diagram of a machine vision-based particulate matter appearance detection device provided in the present specification.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, based on the embodiments of the application, which would be apparent to one of ordinary skill in the art without undue burden are intended to be within the scope of the application.
The specification provides a particulate matter outward appearance detection device based on machine vision, as shown in fig. 1, includes first hopper 1, first transport mechanism 2, second hopper 3, second transport mechanism 4, material collector 5, be used for special-shaped detection's first camera 6, be used for different-color detection's second camera 7 and third camera 8, detecting system 9 and control system 10.
The first hopper 1 is used for containing the particulate matter to be detected.
The first conveying mechanism 2 is located below the first hopper 1, and is used for conveying the particles falling in the first hopper 1 to the position above the second hopper 3, and enabling the particles to freely fall into the second hopper 3 above the second hopper 3.
Particulate matter in this specification can include thermoplastic particulate resins such as: polyethylene (PE), polypropylene (PP), polystyrene (PS), impact polystyrene (PS-I), acrylonitrile-butadiene-styrene (ABS), styrene-acrylonitrile (SAN), ethylene-vinyl acetate (EVAC), etc., or modified particulate plastics thereof.
The first conveyor 2 may be a vibrating table or a motor driven conveyor.
The conveying surface (i.e., the surface on which the particulate matter is placed) in the first conveying mechanism 2 may be a flat surface or an inclined surface. In the case of a planar conveying surface, the planar movement is driven by the motor, so that the particles move from below the first hopper 1 to above the second hopper 3. In the case where the conveying surface is a slope, the particulate matter may be moved above the second hopper 3 under the support and guide of the slope.
"Free fall" in this specification means falling without any object support.
The second hopper 3 is provided below the first conveyor 2 for collecting particulate matter falling from the first conveyor 2. The second hopper 3 and the first hopper 1 are arranged in a staggered manner in the horizontal direction.
The second conveying mechanism 4 is located below the second hopper 3 and is used for conveying the particles falling in the second hopper 3 to the position above the material collector 5 and enabling the particles to freely fall into the material collector 5 above the material collector 5.
The second conveyor 4 may be a vibrating table or a motor driven conveyor.
The conveying surface (i.e., the surface on which the particulate matter is placed) in the second conveying mechanism 4 may be a flat surface or an inclined surface. In the case of a planar conveying surface, the planar movement is driven by the motor so that the particles move from below the second hopper 3 to above the material collector 5. In the case of a ramp, the particles can be moved above the material collector 5 under the support and guidance of the ramp.
"Free fall" in this specification means falling without any object support.
A material collector 5 is provided below the second conveyor 4 for collecting particulate matter falling from the second conveyor 4.
A first camera 6 for profile detection is arranged between the first conveyor 2 and the second hopper 3 and is provided with a light source for taking a first image of the particulate matter falling freely from the first conveyor 2. The first camera 6 is a line scan camera.
The first camera 6 may be a black-and-white camera or a color camera. Preferably, the first camera 6 is a black and white line scan camera capable of capturing black and white images. The black-and-white camera can save computing resources and improve the abnormal detection rate under the condition of consuming minimum resources. Under the same configuration, the black-and-white camera can provide detection efficiency according to the special shape, and the special shape detection result can be obtained more quickly.
The present utility model is not particularly limited as to whether the first camera for the profile detection is a black-and-white camera or a color camera, as long as it is a line scan camera, but the present utility model particularly recommends the use of a black-and-white camera.
The second camera 7 and the third camera 8 for detecting the different colors are arranged between the second conveying mechanism 4 and the material collector 5. The second camera 7 and the third camera 8 are arranged on two sides of the free falling path of the particles in opposite directions, are staggered in the direction of the free falling path of the particles, and are respectively provided with a light source. The second camera 7 and the third camera 8 are used to take images of the particles from both sides of the free falling particles, respectively.
The second camera 7 and the third camera 8 are arranged in a staggered mode in the direction of a free falling path of the particles, so that shooting interference between the second camera 7 and the third camera 8 can be reduced, and particle images can be shot from the front side and the back side respectively, and accordingly whether the particles are heterochromatic particles or not can be detected according to the front side and the back side, and the problem that detection results are inaccurate due to the fact that the color of one side surface is not shot is prevented.
The second camera 7 and the third camera 8 are color line scan cameras capable of capturing color images.
The detection system 9 is connected to the first camera 6, the second camera 7, and the third camera 8. The detection system 9 is configured to receive images captured by the first camera 6, the second camera 7, and the third camera 8, analyze and process statistical data, and display a detection result.
The detection system 9 can identify abnormal particles based on the images shot by the first camera 6, identify abnormal particles based on the images shot by the second camera 7 and the third camera 8, and then count the detection results of the abnormal particles and the abnormal particles to form a detection report and display the detection report.
The method for detecting the special-shaped particles from the image and the method for detecting the heterochromatic particles from the image are all existing in the prior art, and the novel improvement of the method is not aimed at improving the detection method, so the detection method of the special-shaped particles and the heterochromatic particles is not described in detail.
The irregularly shaped particles refer to particles having a shape different from that of normal particles. Such as the large, small, snake skin, tailing, and floe described in the background.
The heterochromatic particles refer to particles having a color different from that of normal particles. Such as black particles, black specks, colored particles as described in the background.
In the prior art, a large number of target detection algorithms exist for detecting abnormal particles and abnormal color particles from images, and the detection method adopted by the detection system 9 can be the existing method in the prior art, and the specific detection method is not described in detail in this scheme.
The control system 10 is used to control the operation of the equipment in the particulate matter appearance inspection device. The device may be a transmission, camera, light source, computer, etc.
The particulate matter outward appearance detection device based on machine vision that this specification provided is used for the dysmorphism to detect through first camera shooting, and through the second camera of relative staggered setting, third camera shooting be used for the color image of heterochrosis detection, carry out analysis, processing, statistics to the image through detecting system, obtain the testing result of dysmorphism heterochrosis. The special-shaped heterochromatic detection is carried out by the particle appearance detection device, so that subjectivity and difference of manual operation can be reduced, and the detection accuracy and repeatability are improved; the problem of visual fatigue of the detection personnel, which is frequently existing at present, is avoided; reduces the cost of manual operation and time, and greatly improves the effect of detecting the particulate matters.
A first camera for dysmorphism detects sets up the backlight source to make first camera backlight shoot particulate matter. As shown in fig. 1, the backlight source 11 and the first camera 6 may be disposed on both sides of the particulate matter falling path so that the parallel light of the backlight source 11 is irradiated toward the first camera 6.
The image shot by the first camera 6 is used for detecting special-shaped particles, the shape of the particles is focused more, and the outline characteristics of the particles can be highlighted by shooting the image particles by adopting the backlight of the first camera 6, so that the accuracy of special-shaped detection is improved.
The on-off state and/or brightness of the backlight source is controlled by the control system 10.
For example, when the particulate matter appearance detection device based on machine vision starts the detection mode, the control system 10 may automatically control the backlight source 11 to start, and after the detection is completed, the control system 10 may automatically control the backlight source 11 to shut down.
For another example, in the case where the brightness of the picture taken by the first camera is less than the predetermined threshold, a signal may be sent to the control system 10, and the control system 10 may control the brightness of the backlight source 11 to be increased by one level. The control system 10 may divide the brightness of the backlight source 11 into a plurality of levels in advance.
In some embodiments, the second camera 7 and the third camera 8 for detecting the abnormal color are respectively provided with a diffuse reflection light source, so that the diffuse reflection light source photographs the particles.
The diffuse reflection light source is a light source that emits light based on the diffuse reflection principle. The diffuse reflection light source has the characteristic of uniform brightness. As shown in fig. 1, 12 and 13 are schematic diagrams of two diffuse reflection light sources, one for each camera, respectively. The diffuse reflection light source and the camera are arranged at two sides of the falling path of the particulate matters. The diffuse reflection light source includes a light source and a diffuse reflection plate. The light source is positioned on one side of the diffuse reflection plate facing the particulate matters and irradiates towards the diffuse reflection plate. The diffuse reflection plate is a plate with uneven surface, light emitted by the light source is diffusely reflected on the surface of the diffuse reflection plate, and reflected light irradiates the particulate matters.
The images shot by the second camera 7 and the third camera 8 are used for detecting the heterochromatic particles, the color of the particles is more concerned, and the cambered surfaces on the surfaces of the particles generally form specular reflection under the irradiation of parallel light, so that the heterochromatic detection result is disturbed. This scheme can be so through setting up diffuse reflection light source, can improve the inside light transmissivity of particulate matter on the one hand, is convenient for detect out the inside impurity colour of particulate matter, and on the other hand can make the particulate matter by even light irradiation, prevents that specular reflection from appearing, improves the accuracy that the heterochrosis detected.
The on-off status and/or brightness of two different diffuse reflecting light sources are controlled by the control system 10, respectively. The second camera 7 and the third camera 8 respectively correspond to a diffuse reflection light source.
For example, when the machine vision-based particulate matter appearance detection device starts the detection mode, the control system 10 may automatically control the diffuse reflection light source to start, and after the detection is completed, the control system 10 may automatically control the diffuse reflection light source to turn off.
For another example, in the case where the brightness of the picture taken by the camera is less than a predetermined threshold, a signal may be sent to the control system 10, and the control system 10 may control the brightness of the diffuse reflection light source to be increased by one level. The control system 10 may divide the brightness of the diffuse reflection light source into a plurality of levels in advance.
The on-off states and the brightness of the diffuse reflection light sources corresponding to the second camera 7 and the third camera 8 respectively can be synchronously controlled or respectively controlled but not synchronously controlled. The brightness of the diffuse reflection light sources corresponding to the second camera 7 and the third camera 8 may be the same or different.
In the present specification, "first", "second" and "third" in the first, second and third cameras are used only to distinguish between different cameras, and do not indicate the order-related meaning such as the order of operation of the cameras.
In some embodiments, as shown in fig. 1, the machine vision-based particulate matter appearance detection device further includes: the weighing sensor 14 is arranged below the material collector 5 and is connected with the detection system 9 for detecting the total weight of the particles collected in the material collector 5. The load cell 14 is controlled by the control system 10 to be activated and deactivated. The load cell 14 transmits data to the detection system.
In some embodiments, as shown in fig. 1, the machine vision-based particulate matter appearance detection device further includes: the first rejecting mechanism is arranged between the first camera 6 and the second hopper 3. The first removing mechanism is connected with the detection system 9 and the control system 10, and the control system 10 is used for controlling the removal of the special-shaped particles according to the identification result of the detection system 9.
In some embodiments, as shown in fig. 1, the machine vision-based particulate matter appearance detection device further includes: a second reject mechanism is arranged between the second camera 7 and the material collector 5 and/or between the third camera 8 and the material collector 5.
The second removing mechanism is connected with the detecting system 9 and the control system 10, and is used for removing the heterochromatic particles under the control of the control system 10 according to the identification result of the detecting system 9.
The first removing mechanism and/or the second removing mechanism can remove the particles by controlling the baffle to rotate so as to change the movement path of the particles, and can remove the particles by controlling the blowing-up mechanism to blow.
Based on the detection result of the detection system 9, the particulate matter appearance detection device based on machine vision can automatically detect indexes such as a thousandth abnormal rate, a kilogram abnormal rate and the like, and obtain a relatively perfect particulate matter detection report.
While the present application has been described by way of embodiments, those of ordinary skill in the art will recognize that there are many variations and modifications of the present application without departing from the spirit of the application, and it is intended that the appended claims encompass such variations and modifications as do not depart from the spirit of the application.
Claims (8)
1. A machine vision-based particulate matter appearance detection device, comprising:
The first hopper is used for receiving the particles to be detected;
the first conveying mechanism is positioned below the first hopper and is used for conveying the particles falling in the first hopper to the upper part of the second hopper and enabling the particles to freely fall into the second hopper above the second hopper;
a second hopper disposed below the first conveying mechanism for collecting particulate matters falling from the first conveying mechanism;
The second conveying mechanism is positioned below the second hopper and is used for conveying the particles falling in the second hopper to the position above the material collector and enabling the particles to freely fall into the material collector above the material collector;
a material collector arranged below the second conveying mechanism and used for collecting particles falling from the second conveying mechanism;
The first camera is used for detecting abnormal shapes, is arranged between the first conveying mechanism and the second hopper, is provided with a light source, and is used for shooting images of particles freely falling from the first conveying mechanism; the first camera is a linear array scanning camera;
The second camera and the third camera for detecting the different colors are arranged between the second conveying mechanism and the material collector; the second camera and the third camera are oppositely arranged at two sides of the free falling path of the particles, are staggered in the direction of the free falling path of the particles, and are respectively provided with a light source; the second camera and the third camera are used for shooting images of the particles from two sides of the free-falling particles respectively; the second camera and the third camera are color linear array scanning cameras;
The detection system is connected with the first camera, the second camera and the third camera; the detection system is used for receiving images shot by the first camera, the second camera and the third camera, analyzing and processing statistical data and displaying detection results;
and the control system is used for controlling the operation of equipment in the particulate matter appearance detection device.
2. The particulate matter appearance inspection device of claim 1, wherein the first camera is a black and white line scan camera.
3. The particulate matter appearance inspection device according to claim 1 or 2, wherein the first camera for profile inspection is provided with a backlight source so that the first camera photographs particulate matter in backlight; the control system controls the on-off state and/or brightness of the backlight source.
4. The particulate matter appearance inspection device according to claim 1, wherein the second camera and the third camera for the heterochromatic inspection are respectively provided with a diffuse reflection light source, and the particulate matter is photographed by the diffuse reflection light source; the control system controls the on-off state and/or brightness of the different diffuse reflection light sources respectively.
5. The particulate matter appearance inspection device of claim 1, wherein the first conveyor mechanism and/or the second conveyor mechanism is a vibrating table or a conveyor belt.
6. The particulate matter appearance inspection device according to claim 1, further comprising:
The weighing sensor is arranged below the material collector and connected with the detection system, and is used for detecting the total weight of the particles collected in the material collector; the weighing sensor is controlled by the control system to start and close, and data is transmitted to the detection system.
7. The particulate matter appearance inspection device according to claim 1, further comprising:
The first removing mechanism is arranged between the first camera and the second hopper; the first removing mechanism is connected with the detection system and the control system, and the control system is used for removing the special-shaped particles according to the identification result of the detection system.
8. The particulate matter appearance inspection device according to claim 1, further comprising:
The second removing mechanism is arranged between the second camera and the material collector and/or between the third camera and the material collector; the second removing mechanism is connected with the detection system and the control system, and the control system is used for removing the heterochromatic particles according to the identification result of the detection system.
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| CN202323086426.7U CN220983032U (en) | 2023-11-15 | 2023-11-15 | Particulate matter outward appearance detection device based on machine vision |
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| CN202323086426.7U CN220983032U (en) | 2023-11-15 | 2023-11-15 | Particulate matter outward appearance detection device based on machine vision |
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2023
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