Granule quality detection equipment

Abstract

The utility model discloses granule quality detection equipment, and the equipment comprises a machine base which comprises a light-transmitting table top for placing to-be-detected granules and a containing space located at the lower side of the light-transmitting table top; the light source assembly is arranged in the containing space and used for providing first-intensity light and second-intensity light. The grating component is arranged in the accommodating space in parallel with the light-transmitting table top, is positioned between the light source component and the light-transmitting table top, and is provided with light and shade stripes which correspond to the particle size of the to-be-detected granules and are used for dividing light provided by the light source component; the reflecting cover is arranged between the camera device and the light-transmitting table top, is provided with a window corresponding to the camera device, and is used for reflecting the segmented transmitted light to form multi-angle reflected light so as to construct an image acquisition environment for eliminating a false target by using the multi-angle reflected light and the segmented transmitted light; and the camera device is suspended on the upper side of the light-transmitting table top and is used for shooting a detection image of the to-be-detected aggregate.

Description

Technical Field

[0001] The present application relates to the technical field of visual quality inspection, and in particular to a pellet quality inspection device. Background Art

[0002] Resin products (such as resin crafts, resin parts, resin films, etc.) and plastic products (such as plastic containers, plastic toys, plastic parts, etc.) can be made from granules (or granular materials) of corresponding materials. However, due to the influence of raw materials or the inevitable addition of impurities during preparation, there are often impurity defects (also called discolored spots) in the prepared granules. For example, transparent plastic granules usually have black spots or defects of other colors that are different from the color of the granules themselves. Granules are raw materials for preparing other products. In order to ensure the quality of products produced using granules, it is necessary to test the quality of the granules, especially the defect rate in the same batch of granules.

[0003] At present, pellets are usually illuminated by a lighting environment provided by special equipment, and pellet images are collected and analyzed to detect the defect rate of the pellets. However, since light irradiates the pellets, shadows of the pellets are often formed around the pellets. In particular, when many pellets are laid together, the shadows between the pellets will interfere with the black spot detection of the pellets. In addition, when the pellets are transparent, light between the pellets or between the uneven textures inside the pellets will form insufficient light areas on the surface of the particles due to mutual refraction and / or reflection, thereby presenting black spots. The black spots will also interfere with the black spot detection of the pellets. In particular, in the subsequent image analysis, the above-mentioned shadows or black spots are often identified as physical defects contained in the pellets, thereby causing interference from false targets, resulting in the inability to accurately obtain detection results.

[0004] Therefore, when using the principle of illumination to detect the quality of pellets, how to eliminate the interference of shadows and black spots derived from illumination on the detection of pellet defects so as to accurately detect the physical defects of pellets is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] In view of the shortcomings of the related technologies mentioned above, the purpose of the present application is to provide a pellet quality detection device to solve the technical problem of how to eliminate the interference of shadows and black spots derived from illumination on pellet defect detection when detecting pellet quality using the principle of illumination so as to accurately detect physical defects of pellets.

[0006] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present application provides a pellet quality detection device, comprising: a machine base, comprising a light-transmitting table for placing the pellets to be detected and a storage space located below the light-transmitting table; a light source component, arranged in the storage space, for providing a first intensity light and a second intensity light, wherein the distribution area of ​​the first intensity light corresponds to the distribution area of ​​the pellets to be detected and the intensity of the first intensity light is less than the intensity of the second intensity light; a grating component, arranged in the storage space in parallel with the light-transmitting table, and located between the light source component and the light-transmitting table. There are light and dark stripes corresponding to the particle size of the granular material to be inspected for dividing the light provided by the light source assembly; a reflector is arranged on the upper side of the light-transmitting table, and is used to reflect the divided transmitted light to form multi-angle reflected light so as to use the multi-angle reflected light and the divided transmitted light to construct an image acquisition environment for eliminating false targets; and a camera device is suspended on the upper side of the light-transmitting table to capture the detection image of the granular material to be inspected under the condition that the granular material to be inspected is in the image acquisition environment for eliminating false targets, so as to highlight the image features of the true target of the granular material to be inspected in the detection image.

[0007] In certain embodiments disclosed in the first aspect of the present application, the true target is a physical defect in the inspected granular material; the false target includes at least one of the following: a shadow produced by light irradiating the inspected granular material, a shadow produced on the edge of the inspected granular material due to mutual influence between the inspected granular materials, and a black spot produced by local insufficient illumination due to refraction and / or reflection of light on the inspected granular material made of transparent material.

[0008] In certain embodiments disclosed in the first aspect of the present application, the light source assembly includes a planar light source for emitting second-intensity light and a dark light-transmitting plate covering the upper side of the planar light source for reducing the second-intensity light to provide first-intensity light.

[0009] In certain embodiments disclosed in the first aspect of the present application, the dark light-transmitting plate covers the surface of the planar light source or is disposed between the planar light source and the grating component.

[0010] In certain embodiments disclosed in the first aspect of the present application, the dark light-transmitting plate covers the lower surface of the grating assembly to move synchronously with the grating assembly.

[0011] In certain embodiments disclosed in the first aspect of the present application, the length and width of the dark light-transmitting plate are larger than the length and width of the distribution area of ​​the particles to be inspected on the light-transmitting table and smaller than the length and width of the planar light source.

[0012] In certain embodiments disclosed in the first aspect of the present application, the dark light-transmitting plate is a light-transmitting black film.

[0013] In certain embodiments disclosed in the first aspect of the present application, the light transmittance of the dark light-transmitting plate is 10%-30%.

[0014] In certain embodiments disclosed in the first aspect of the present application, the light source assembly includes a planar light source, and the planar light source is provided with a dark light area for emitting light of a first intensity and a bright light area surrounding the dark light area for emitting light of a second intensity.

[0015] In certain embodiments disclosed in the first aspect of the present application, the length and width of the dark light area are greater than the length and width of the distribution area of ​​the to-be-tested granular material on the light-transmitting table.

[0016] In certain embodiments disclosed in the first aspect of the present application, the grating assembly includes a grating plate having light and dark stripes and a lateral movement mechanism for driving the grating plate to move laterally so that the light and dark stripes thereof dynamically divide the transmitted light.

[0017] In certain embodiments disclosed in the first aspect of the present application, the grating assembly includes a lifting and adjusting mechanism for driving the grating plate to move vertically to adjust the distance between the grating plate and the light-transmitting table.

[0018] In certain embodiments disclosed in the first aspect of the present application, the grating assembly includes a mounting mechanism disposed in the base for fixing the grating plate, and the mounting mechanism is connected to the lateral movement mechanism to drive the grating plate to move laterally under the drive of the lateral movement mechanism.

[0019] In certain embodiments disclosed in the first aspect of the present application, the light and dark stripes include light stripes and dark stripes that are parallel to each other, wherein the light stripes and the dark stripes are arranged alternately and the light and dark stripes include at least one stripe direction.

[0020] In certain embodiments disclosed in the first aspect of the present application, the contour of at least one of the light and dark stripes is different from the contour of the granular material to be inspected, and / or the stripe direction of at least one of the light and dark stripes is different from the contour direction of the granular material to be inspected.

[0021] In certain embodiments disclosed in the first aspect of the present application, the bottom of the reflector is close to the upper surface of the light-transmitting table to provide reflected light of sufficient intensity for the surface of the granular material to be inspected.

[0022] In certain embodiments disclosed in the first aspect of the present application, the reflector is disposed on a frame that is adjustable in height so as to adjust the distance between the reflector and the granular material to be inspected.

[0023] In summary, the pellet quality detection equipment provided by the present application provides a first intensity light and a second intensity light through a light source component, which not only ensures that the reflector can reflect light of sufficient intensity but also avoids excessive light intensity in the distribution area of ​​the pellets to be detected, which may cause overexposure of the detection image of the pellets to be detected. The light divided by the reflector and the grating component can form multi-angle reflected light, so that the divided transmitted light and the multi-angle reflected light construct an image acquisition environment that eliminates false targets. Furthermore, when the pellets to be detected are in an image acquisition environment that eliminates false targets, the image features of the false targets are weakened or even eliminated, and the image features of the true targets are reduced by adjusting the height of the grating plate in the up and down directions, the distance between the reflector and the light-transmitting table, and the brightness of the light source component. Under the premise of the technical effect of manifestation, by driving the grating plate laterally, the black and white stripes and the granular material to be inspected are relatively moved, so that the residual shadows and / or the black light spots of the granular material to be inspected produce dynamic changes in image grayscale and / or stripe deformation characteristics in the relative movement of the black and white stripes. On this basis, by using multiple characteristic images taken by the camera device for detection and analysis, the interference of shadows and black light spots on the detection of granular defects can be eliminated or reduced; in addition, the outline of the stripes in the grating assembly provided by the present application is different from the outline of the granular material to be inspected, so that it can avoid the inability to distinguish whether the light change position is on the granular material to be inspected or outside the granular material to be inspected due to the same stripe outline as the granular material to be inspected, thereby improving the accuracy of the quality detection results of the granular material. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The specific features of the present application are shown in the attached claims. The features and advantages of the invention involved in the present application can be better understood by referring to the exemplary embodiments and drawings described in detail below. The drawings are briefly described as follows:

[0025] Figure 1 It is a schematic diagram showing the principle of a pellet quality detection device in one embodiment of the present application.

[0026] Figure 2 Shown is a schematic diagram of the distribution area of ​​the first and second intensity lights in one embodiment of the present application.

[0027] Figure 3 Shown is a schematic diagram of light and dark stripes arranged on a light source assembly in one embodiment of the present application.

[0028] Figure 4 Shown is a schematic diagram of light and dark stripes arranged on a light source assembly in another embodiment of the present application.

[0029] Figure 5a Shown is a schematic diagram of light propagation in one embodiment of the present application.

[0030] Figure 5bShown is a schematic diagram of light propagation in another embodiment of the present application. DETAILED DESCRIPTION

[0031] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0032] In the following description, reference is sometimes made to the accompanying drawings, which describe several embodiments of the present application. It should be understood that other embodiments may also be used, and that changes in module or unit composition, electrical, and operation may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present application is limited only by the claims that are published. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0033] It will be understood that when a part or element is referred to as being "on" or extending "onto" another element, the element may be directly on or directly extending onto the other element, or intervening elements may also be present. Conversely, when an element is referred to as being "directly on" or "extending directly onto" another element, there are no intervening elements. It will also be understood that when an element is referred to as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intervening elements. Conversely, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements.

[0034] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe the relationship between one element, layer or region and another element, layer or region as shown in the figure. It will be understood that these terms are intended to cover different device orientations other than the orientation depicted in the figure. In the present application, the "vertical", "horizontal" and "parallel" are defined as: including the situation of ±10% on the basis of the standard definition. For example, vertical usually refers to an angle of 90° relative to the reference line, but in the present application, vertical refers to the situation within 80° to 100°. In the following embodiments of the present application, in order to clearly illustrate the positional relationship between the various devices, components, parts, structures, or mechanisms of the pellet quality detection device in the embodiments of the present application, the side of the camera device close to the pellet quality detection device in the various devices, components, parts, structures, or mechanisms in the embodiments of the present application is referred to as the upper side, upper end, or top, and the side away from the camera device is referred to as the lower side, lower end, or bottom.

[0035] The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. When used herein, the singular forms "a", "an", and "the" are intended to also include the plural forms unless the context clearly indicates otherwise. It will also be understood that when used herein, the terms "comprise", "include", "include" and / or "comprising" specify the presence of stated features, integers, steps, operations, elements and / or parts, but do not exclude the presence or increase of one or more other features, integers, steps, operations, elements, parts and / or combinations thereof.

[0036] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It will also be understood that the terms used herein should be interpreted as having the meaning consistent with their meaning in the context of this specification and the relevant field, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0037] Unless explicitly stated otherwise, comparative quantitative terms such as "above" and "below" are intended to encompass the concept of equality. As an example, "above" may not only mean "greater than" in a mathematical sense, but may also mean "equal to".

[0038] Although in some instances the terms first, second, etc. are used herein to describe various elements or parameters, these elements or parameters should not be limited by these terms. These terms are only used to distinguish one element or parameter from another element or parameter. For example, a first intensity ray can be referred to as a second intensity ray, and similarly, a second intensity ray can be referred to as a first intensity ray without departing from the scope of the various described embodiments. Both the first intensity ray and the second intensity ray are describing a ray of one intensity, but unless the context clearly indicates otherwise, they are not rays of the same intensity.

[0039] In view of the technical problems mentioned in the background technology, the present application discloses a pellet quality detection device, which provides a first intensity light and a second intensity light through a light source component, which not only ensures that the reflector can reflect light of sufficient intensity but also avoids excessive light intensity in the distribution area of ​​the pellet to be inspected, which makes the detection image of the pellet to be inspected overexposed. The light divided by the reflector reflection grating component can form multi-angle reflected light. In this way, the divided light (or transmitted light) and the multi-angle reflected light construct an image acquisition environment for eliminating false targets. Furthermore, when the pellet to be inspected is in the image acquisition environment for eliminating false targets, the number of shadows and black spots in the detection image captured by the camera device is greatly reduced, thereby reducing the interference of shadows and black spots on the detection of pellet defects.

[0040] The pellet quality detection device described in the present application is a device that can capture the detection image of the pellet to be detected. The control device in the pellet quality detection device or the computer device connected to the pellet quality detection device can use the detection image to obtain the pellet quality detection result. Among them, the pellet to be detected refers to granular particles produced by the polymer granulation process, which can be used to produce products of corresponding materials. The pellet to be detected can be a resin material or a plastic material. For example, the pellet to be detected of resin material can be used to produce resin products, such as resin crafts, resin parts, resin films, etc.; for another example, the pellet to be detected of plastic material can be used to produce plastic products, such as plastic containers, plastic toys, plastic parts, etc. The pellet to be detected can be a pellet of natural or colored transparent material, translucent material, or non-transparent material. The detection image includes the image features of the pellet to be detected. In the subsequent description, the pellet to be detected can also be referred to as the pellet to be detected or the pellet to be detected.

[0041] See also Figure 1 , which is a schematic diagram of the principle of a pellet quality detection device in one embodiment of the present application. As shown in the figure, the pellet quality detection device includes: a base 1, a light source assembly 2, a grating assembly 3, a reflector 4, and a camera device 5.

[0042] In one embodiment, the base 1 includes a light-transmitting table 10 and a receiving space 11. The light-transmitting table 10 is located at the top of the base 1 and is used to place the pellets to be inspected; further, the light-transmitting table 10 is located in the middle area of ​​the top of the base 1.

[0043] In one embodiment, the light-transmitting table 10 is made of a light-transmitting material. For example, in one example, the light-transmitting material is glass, PMMA, PC, or PET with a high light transmittance. For example, the light transmittance of the light-transmitting material is greater than 90%. In another embodiment, the light-transmitting table 10 may also be a table with a frame-shaped structure and only a light-transmitting material is provided in the middle area to form a light-transmitting window, and the pellets 6 to be inspected may be placed in the light-transmitting middle area.

[0044] In another embodiment, the light-transmitting table top 10 may also be in the form of a frame-shaped structure but with a hollow window in the middle area, which is used to cooperate with the placement of a carrier vessel with a light-transmitting bottom. For example, in order to facilitate the placement, removal or replacement of the pellets 6 to be tested, the pellets 6 to be tested may be placed in a carrier vessel with a light-transmitting bottom, such as a tray, in advance, and then the carrier vessel with a light-transmitting bottom may be placed on the hollow window of the light-transmitting table top 10; of course, based on the inspiration of the above embodiment, in order to facilitate the placement and removal of the pellets to be tested, a carrier vessel such as a tray with a light-transmitting material at the bottom may be directly placed on the light-transmitting table top 10 to carry the pellets to be tested.

[0045] The accommodating space 11 formed in the base 1 is located at the lower side of the light-transmitting table 10, and is used to accommodate the light source assembly 2 and the grating assembly 3. In addition, the accommodating space 11 forms a closed space to shield the influence of the light source outside the equipment, thereby forming an independent light source projection unit with an independent closed space to provide transmitted light for the granular material to be inspected; in a specific embodiment, the base 1 is also provided with a heat dissipation assembly for dissipating heat for the light source assembly 2 arranged in the accommodating space 11, such as a heat sink and / or a heat dissipation fan.

[0046] In a specific embodiment, the base 1 includes a housing 12, the top of the housing 12 is provided with an opening, and the interior thereof is the accommodating space 11. The light-transmitting table 10 is arranged at the opening and connected to the housing 12. Further, the light-transmitting table 10 can be connected to the housing 12 by snapping or buckling, so that the light-transmitting table 10 can be detached from the base 1 without using a disassembly tool, so as to facilitate the removal of the pellets 6 to be inspected placed on the light-transmitting table 10.

[0047] In one embodiment, the peripheral side of the light-transmitting table 10 has a convex structure (not shown) to prevent the pellets to be inspected from falling into the accommodation space 11 when the light-transmitting table 10 is detached from the base 1; further, in order to prevent the light from propagating to the outside of the pellet quality inspection device through the shell 12, in other words, in order to make the light only pass through the light-transmitting table 10, the shell 12 is made of an opaque material. The light transmittance of the opaque material is close to 0. For example, the opaque material is metal.

[0048] It should be noted that, in other embodiments, if the convenience of taking out the granular material 6 to be inspected is not considered, the light-transmitting table 10 can also be fixed to the housing 12 by screws or bonding, etc., which requires the use of loading and unloading tools.

[0049] A light source assembly 2 is provided in the accommodation space 11 of the base 1. In one embodiment, the light source assembly 2 is used to provide a first intensity light and a second intensity light, and the intensity of the first intensity light is less than the intensity of the second intensity light. For example, the intensity of the first intensity light is about 5%-30% of the intensity of the second intensity light, and specifically, the intensity of the first intensity light is about 5%, 15%, 20%, 25%, or 30% of the intensity of the second intensity light. In this embodiment, the distribution area of ​​the first intensity light corresponds to the distribution area of ​​the granular material to be tested. In other words, the projection area of ​​the distribution area of ​​the first intensity light at the bottom of the base 1 includes the projection area of ​​the distribution area of ​​the granular material to be tested at the bottom of the base 1, and the distribution area of ​​the second intensity light is located outside the distribution area of ​​the first intensity light. Wherein, the distribution area of ​​the granular material to be tested is the area that directly carries the granular material to be tested, which can be a tray area (or a carrier vessel area), a light-transmitting window area in the light-transmitting table 10, or the entire light-transmitting table 10 area. The light source assembly 2 can prevent the light intensity in the distribution area of ​​the inspected granular material from being too high, which may cause the inspection image of the inspected granular material of transparent material to be overexposed, by providing the first intensity light and the second intensity light. It can also use the second intensity light to ensure that the reflector can reflect light of sufficient intensity so that the camera device 5 can capture a clear inspection image.

[0050] In one example, see Figure 2 , which is a schematic diagram of the distribution area of ​​the first and second intensity light in one embodiment of the present application. As shown in the figure, the distribution area G of the first intensity light is a rectangular area, and the distribution area H of the second intensity light is a square ring area located outside the rectangular area. It should be noted that the present application does not limit the shape of the distribution area of ​​the first and second intensity light, for example. The distribution area of ​​the first intensity light can also be a circular area, and the distribution area of ​​the second intensity light can be a circular ring area.

[0051] In one embodiment, if Figure 1 As shown, the light source assembly 2 includes a plane light source 20 for emitting a second intensity light and a dark light-transmitting plate 21 covering the upper side of the plane light source 20 for reducing the second intensity light to provide a first intensity light. In other words, in this embodiment, the second intensity light is emitted by the plane light source 20, and the dark light-transmitting plate 21 covers the upper side of the plane light source 20. After the second intensity light is irradiated on the dark light-transmitting plate 21, the dark light-transmitting plate 21 absorbs part of the light intensity, so that the intensity of the first intensity light passing through the dark light-transmitting plate 21 is less than the intensity of the second intensity light, and thus the light source assembly 2 can provide the first intensity light and the second intensity light.

[0052] The dark light-transmitting plate 21 covers the upper side of the planar light source 20, which means that the dark light-transmitting plate 21 can be Figure 1 As shown, it is located between the plane light source 20 and the grating component 3, and can also cover the upper surface of the plane light source 20, or cover the lower surface of the grating component 3. In one embodiment, the dark light-transmitting plate 21 covers the upper side of the plane light source 20 and keeps a preset gap with the plane light source 20; in another embodiment, the dark light-transmitting plate 21 can also cover or lay on the upper surface of the plane light source 20 at zero distance; for example, the dark light-transmitting plate 21 covers the central area of ​​the upper surface of the plane light source 20. In another embodiment, the dark light-transmitting plate 21 covers the lower surface of the grating component 3 (for example, the lower surface of the grating plate described later) to move synchronously with the grating component 3 (for example, the grating plate described later).

[0053] In the embodiment where the main distribution area of ​​the first intensity light is a rectangular area or a square area, in order to ensure that the projection area of ​​the distribution area of ​​the first intensity light at the bottom of the machine base 1 includes the projection area of ​​the distribution area of ​​the to-be-detected granular material at the bottom of the machine base 1, and the dark light-transmitting plate 21 cannot cover all the plane light sources 20, the length and width of the dark light-transmitting plate 21 are greater than the length and width of the distribution area of ​​the to-be-detected granular material on the light-transmitting table 10, and smaller than the length and width of the plane light source 20. For example, the length of the dark light-transmitting plate 21 is set to a, and the width is set to b; the length of the distribution area of ​​the to-be-detected granular material is set to c, and the width is set to d; the length of the plane light source is set to e, and the width is set to f, then a>c, b>d, a<e, and b<f.

[0054] In one embodiment, the transmittance of the dark light-transmitting plate 3 is about 5%-30%. For example, the transmittance of the dark light-transmitting plate 3 is about 5%, 10%, 15%, 20%, 25%, or 30%. In a specific embodiment, the dark light-transmitting plate is a light-transmitting black film. In one example, the transmittance requirement can be achieved by adjusting the grayscale (RGB value) of the black film, the thickness of the black film, or the material of the black film.

[0055] In one embodiment, the planar light source 20 is an LED planar light source, and further, the LED planar light source is a light source with adjustable light intensity. In other embodiments, the planar light source 20 may also be other types of planar light sources, for example, the planar light source 20 may also be an OLED planar light source.

[0056] The light source assembly 2 of the present application provides light of the first intensity and light of the second intensity by arranging a dark light-transmitting plate 21 on the planar light source 20, thereby reducing the cost of the light source assembly.

[0057] In another embodiment, in order to reduce the complexity of the light source assembly and reduce the difficulty of assembly, the light source assembly can also provide the first intensity light and the second intensity light by only using a plane light source whose light intensity can be controlled in different zones. Specifically, the plane light source is provided with a dark light area for emitting the first intensity light and a bright light area surrounding the dark light area for emitting the second intensity light. The projection area of ​​the dark light area at the bottom of the base includes the projection area of ​​the distribution area of ​​the pellets to be inspected at the bottom of the base. In the embodiment where the dark light area is a rectangular area or a square area, the length and width of the dark light area are greater than the length and width of the distribution area of ​​the pellets to be inspected on the light-transmitting table.

[0058] In another embodiment, in order to reduce the complexity of the light source assembly and reduce the difficulty of assembly, the light source assembly can also be implemented by a DLP (Digital Light Procession, DLP for short) projection device or an LCD (Liquid Crystal Display, LCD for short) projection device. The DLP projection device, for example, includes a DMD chip, a controller and a storage module. The storage module stores a projection image that will be used to emit light with a first intensity and a second intensity. After receiving a control signal from the controller, the DMD chip irradiates the light source corresponding to each pixel on the projection image onto the light-transmitting table. The DMD chip looks like a small mirror encapsulated in a closed space composed of metal and glass. In fact, this mirror is composed of hundreds of thousands or even millions of micro mirrors, each of which represents a pixel, and the projected image is composed of these pixels. The DMD chip can be simply described as a semiconductor optical switch and micro lens corresponding to the pixel point. The controller allows / disables each microchip to reflect light by controlling each optical switch in the DMD chip, thereby irradiating the corresponding projection image onto the light-transmitting table surface, so that the camera device located on the upper side of the pellet quality detection device can receive the light reflected from the surface of the pellet to be detected and the light transmitted by the pellet to be detected to capture the detection image of the pellet to be detected. For another example, the LCD projection device may include an LCD light source system, and the LCD light source system includes an LED light source and an LCD liquid crystal screen. The control chip in the LCD projection device projects the projection image with the first intensity light and the second intensity light onto the light-transmitting table surface through the LCD liquid crystal screen.

[0059] like Figure 1As shown, the first intensity light and the second intensity light emitted by the light source assembly 2 propagate upward and irradiate the grating assembly 3. The grating assembly 3 is arranged in parallel with the light-transmitting table 10 in the accommodating space 11 and is located between the light-transmitting table 10 and the light source assembly 2. The grating assembly 3 is provided with light and dark stripes corresponding to the particle size of the granular material 6 to be inspected, and the light and dark stripes are used to divide the light provided by the light source assembly, that is, dividing the first intensity light will also divide the second intensity light.

[0060] Specifically, the light stripes and the dark stripes in the light and dark stripes are alternately arranged on the light source component 3. The light stripes are used to transmit light, and the dark stripes are used to absorb light. In other words, the dark stripes prevent light from transmitting through the grating component 3 to a certain extent, so that the light stripes can divide the light provided by the light source component 2 into alternating light areas and no light or dark light areas. In an example, the light stripes are white stripes, and the dark stripes are black stripes. For example, see Figure 3 and Figure 4 , respectively show schematic diagrams of light and dark stripes provided on the light source assembly in different embodiments of the present application. As shown in the figures, the light and dark stripes on the light source assembly are white stripes and black stripes arranged alternately.

[0061] In one embodiment, the light and dark stripes are parallel to each other. In other words, the light stripes and the dark stripes are parallel to each other. Figure 3 As shown, the light and dark stripes are black and white stripes parallel to each other. In another embodiment, the light and dark stripes are arc stripes placed parallel to each other. In another embodiment, the light and dark stripes can also be concentric ring stripes. For example, Figure 4 As shown, the light and dark stripes are concentric black and white circular stripes.

[0062] In one embodiment, the light and dark stripes correspond to the particle size of the granular material 6 to be inspected, so as to avoid the difficulty in distinguishing the background image features and the image features of the granular material 6 to be inspected in the inspection image due to the light and dark stripes being too large. The background image features are the alternating light and dark features presented in the inspection image by the light that passes through the light-transmitting table but does not pass through the granules to be inspected.

[0063] Specifically, the light and dark stripes correspond to the particle size of the granular material to be tested, which means that the width of the light and dark stripes in the alternating arrangement direction corresponds to the particle size of the granular material to be tested. In other words, the width of the light and dark stripes in the alternating arrangement direction is close to the particle size of the granular material to be tested. For example, the width of the light and dark stripes in the alternating arrangement direction is 0.5 to 3 times the particle size of the granular material to be tested. Among them, the particle size is used to indicate the size of the granular material to be tested. In this embodiment, the staff can replace the light and dark stripes of different widths according to the particle size of the granular material to be tested. For example, directly replace the grating plate described in the following embodiment.

[0064] In order to avoid the difficulty in distinguishing the background image features and the image features of the granular material to be inspected in the detection image due to the stripe contour being the same as the contour of the granular material to be inspected made of transparent material, the contour of at least one of the light and dark stripes is different from the contour of the granular material to be inspected. In one embodiment, the contour of each of the light and dark stripes is different from the contour of the granular material to be inspected. For example, the contour of a spherical granular material to be inspected is roughly circular, and the contour of a cylindrical granular material to be inspected is roughly rectangular. In the embodiment where the granular material to be inspected is spherical, the contour of each of the light and dark stripes can be as follows: Figure 3 In the embodiment where the pellet to be inspected is cylindrical, the outline of each stripe in the light and dark stripes may be in the shape of an arc or as shown. Figure 4 The circular shape shown.

[0065] In order to avoid the difficulty in distinguishing the background image features and the image features of the granular material to be detected in the detection image due to the stripe direction of the stripes being the same as the contour direction of the granular material to be detected made of transparent material, the stripe direction of at least one of the light and dark stripes is different from the contour direction of the granular material to be detected. In other words, the stripe direction of at least one of the light and dark stripes is at an angle to the contour direction of the granular material to be detected. The stripe direction is the extension direction of the stripes. The contour direction of the granular material to be detected refers to one or more directions where the contour of the granular material to be detected is located. For example, the contour of the granular material to be detected is a rectangle, and the contour direction includes the directions where the four sides of the rectangle are located.

[0066] It should be noted that the light and dark stripes may also include at least two stripe directions to form a plurality of stripe groups arranged alternately in parallel, so as to adapt to a plurality of transparent materials to be inspected with a plurality of contour shapes, thereby avoiding synchronous changes between the stripe changes in the transparent area of ​​the inspected particles and the stripe changes in the background area. Figure 3 The stripe shown has only one extension direction, but a stripe may have two or more extension directions due to bending. In other words, the stripes may cross themselves or each other at a certain angle.

[0067] In one embodiment, the light and dark stripes are described in detail by taking the light and dark stripes including stripes in two directions as an example. In one example, a portion of the light and dark stripes are parallel to each other and all stripe directions are in a first direction, and another portion of the light and dark stripes are parallel to each other and all stripe directions are in a second direction, and the first direction and the second direction are two stripe directions at an angle. According to the description of the above embodiment, three or more stripe directions can be configured in the light and dark stripes.

[0068] Since the physical defects to be detected are close in color to the shadow and black light spots of the pellets to be inspected, which makes them difficult to distinguish, in order to assist in identifying the shadow, black light spots, and physical defects through the change of light, the light and dark stripes in the grating component will also move horizontally. Among them, horizontal refers to the alternating arrangement direction of the light and dark stripes. The shadow is the shadow formed by the light irradiating on the pellets to be inspected or the shadow produced on the edge of the pellets to be inspected due to the mutual influence between the pellets to be inspected. The black light spot is the area of ​​insufficient light formed on the surface of the pellets to be inspected after the light is refracted and / or reflected on the pellets to be inspected of the transparent material. Specifically, the black light spot refers to the light refracted and / or reflected inside the pellets to be inspected of the transparent material when the light irradiates the pellets to be inspected of the transparent material. The physical defects are inherent heterochromatic spots (such as black spots) on the pellets to be inspected. The heterochromatic spots are usually defective spots formed by poor preparation process or impurities in the pellets to be inspected.

[0069] In one embodiment, the grating assembly includes a grating plate with light and dark stripes and a transverse movement mechanism. The transverse movement mechanism is used to drive the grating plate to move transversely so that its light and dark stripes dynamically divide the light provided by the light source assembly, so that the alternating light areas and light-free areas are dynamically changed. In one example, the grating assembly includes a mounting mechanism for fixing the grating plate and a transverse movement mechanism, and the transverse movement mechanism includes a driving motor, and the transverse movement mechanism is connected to the mounting structure to drive the mounting mechanism to drive the grating plate to move in the alternating arrangement direction. The present application does not limit the specific form and structure of the transverse movement mechanism, and it is only required that the transverse movement mechanism can drive the grating plate to move in the alternating arrangement direction.

[0070] In one embodiment, the lateral moving mechanism is a lateral moving mechanism that performs periodic reciprocating linear motion. For example, due to the limitation of the accommodating space 11, the lateral moving mechanism drives the grating plate to move a certain distance toward one side, and then moves toward the other opposite side. In this way, the grating plate is periodically and repeatedly driven to move laterally so that its light and dark stripes dynamically divide the light provided by the light source assembly, so that the alternating light areas and light-free areas are in a dynamically changing state.

[0071] In one embodiment, the grating assembly further comprises a lifting and adjusting mechanism for driving the grating plate to move vertically to adjust the distance between the grating plate and the light-transmitting table. The vertical direction refers to the up-down direction. In one embodiment, the lifting and adjusting structure is connected to the mounting mechanism of the grating plate to drive the grating plate to move vertically. The lifting and adjusting structure can be a screw rod or a rack structure or a synchronous belt structure.

[0072] like Figure 1 As shown, the reflector 4 is arranged on the upper side of the light-transmitting table 10 to reflect the light divided by the grating component 3 (or the light transmitted after being divided by the grating component 3). Specifically, the reflector 4 is arranged between the camera device 5 and the light-transmitting table 10, so that the light divided by the grating component 3 is reflected by the inner wall of the reflector 4 after propagating to the inner wall of the reflector 4. The structure of the reflector 4 can be as follows: Figure 1 The cone shape shown may also be a square brick shape, a hemispherical shape, or a square cone shape, etc. The present application does not limit the structure of the reflector, and any reflector that can provide a reflective surface for reflecting the light divided by the grating assembly 3 may be sufficient. In one example, the inner wall of the reflector 4 is coated with a coating that enhances light reflection, and in another example, the diffuse reflection material coated on the inner side of the reflector 4 can also change the reflection angle of the light to provide a richer reflection light angle.

[0073] In one embodiment, see Figure 5a Combined with Figure 1 , Figure 5a The figure shows a schematic diagram of light propagation in an embodiment of the present application. As shown in the figure, the arrow direction is the propagation direction of the light. Specifically, the first intensity light A in the light provided by the light source component 2 is indicated by a dotted arrow, and the second intensity light B is indicated by a solid arrow. After the first intensity light A and the second intensity light B are divided by the grating component 3, part of the light passes through the grating component 3 (for example Figure 5a The light passing through the grating component 3 further passes through the light-transmitting table 10 and then shines on the reflector 4. After being reflected by the reflector 4, it forms reflected light and shines on the surface of the granular material 6 to be inspected. The light reflected by the surface of the granular material 6 to be inspected is transmitted to the camera device 5 and received by the camera device 5. The light passing through the grating component 3 can also directly pass through the light-transmitting table 10 or pass through the light-transmitting table 10 and the granular material 6 to be inspected and then be received by the camera device 5.

[0074] In order to allow the light to be received by the camera device 5, the reflector 4 has a window 41 corresponding to the camera device 5. For example, the window 41 is located at the top of the reflector 4. The window 41 is, for example, an opening formed on the reflector 4. In one embodiment, the opening is sleeved on the lower side of the camera device.

[0075] In one embodiment, the bottom of the reflector is close to the upper surface of the light-transmitting table to provide reflected light of sufficient intensity for the surface of the granular material to be inspected.

[0076] In one embodiment, in order to avoid the influence of ambient light, the bottom of the reflector is buckled onto the light-transmitting table to shield the light outside the reflector. Figure 5b FIG. 1 is a schematic diagram of light propagation in another embodiment of the present application. As shown in the figure, the bottom of the reflector 4 is buckled on the light-transmitting table 10 to shield the light outside the reflector 4 to provide a closed light reflection environment. In other embodiments, the bottom of the reflector can also be as Figure 5a For example, in an embodiment of controlling ambient light (such as turning off the light source in the detection environment), the bottom of the reflector can also be kept at a certain distance from the light-transmitting surface.

[0077] In one embodiment, in order to adjust the distance between the reflector 4 and the light-transmitting table 10 or the granular material to be inspected 6, the reflector 4 is arranged on a lifting and adjustable frame. For example, the lifting and adjustable frame is a screw rod structure or a synchronous belt structure. In another embodiment, in order to adjust the distance between the reflector 4 and the light-transmitting table 10 or the granular material to be inspected 6, the reflector can be spirally arranged on the lens extension part of the camera device 5 in a threaded connection manner, so as to adjust the distance between the reflector 4 and the light-transmitting table 10 or the granular material to be inspected 6 in a spiral manner.

[0078] In the embodiment of the present application, the light divided by the grating component 3 is reflected by the reflector 4 to form multi-angle reflected light, and the multi-angle reflected light and the light divided by the grating component 3 construct an image acquisition environment for eliminating pseudo targets. Among them, the image acquisition environment for eliminating pseudo targets is the lighting environment of the granular material to be inspected. When the granular material 6 to be inspected is in the image acquisition environment for eliminating pseudo targets, the pseudo targets that interfere with quality detection can be reduced. In the present application, the pseudo target includes a black light spot generated by the refraction of light on the granular material 6 to be inspected, or the pseudo target includes a shadow generated around the granular material 6 to be inspected by the reflection of light, or the pseudo target includes both the above-mentioned black light spot and the shadow generated around the granular material 6 to be inspected; in other words, the pseudo target is not an inherent physical defect on the granular material to be inspected, but a false defect caused by illumination. Correspondingly, the true target to be detected is a physical defect in the granular material to be inspected, and the shadow, black light spot, and physical defect are the same or similar to those described above, and will not be repeated here.

[0079] In one embodiment, if Figure 1As shown, the camera device 5 is suspended on the upper side of the light-transmitting table 10 to capture the detection image of the granular material 6 to be inspected. For example, the camera device 5 is arranged at the window 41 of the reflector 4. Specifically, the camera device 5 receives the light reflected by the surface of the granular material 6 to be inspected, the light divided after passing through the light-transmitting table 10, and the light divided after passing through the light-transmitting table 10 and the granular material 6 to be inspected, so as to capture the detection image of the granular material 6 to be inspected. In one example, the camera device 5 is suspended on the upper side of the light-transmitting table 10 through a column (not shown) arranged on one side of the machine base 1. It should be noted that when the granular material 6 to be inspected is made of non-transparent material, the camera device 5 only receives the light reflected by the surface of the granular material 6 to be inspected and the light divided after passing through the light-transmitting table 10.

[0080] The camera device captures the detection image of the granular material 6 to be detected when the granular material 6 to be detected is in the image acquisition environment for eliminating false targets, so as to highlight the image features of the true target of the granular material 6 to be detected in the detection image. In other words, the number of false targets in the detection image captured by the camera device is greatly reduced or even completely eliminated when the granular material 6 to be detected is in the image acquisition environment for eliminating false targets.

[0081] In one embodiment, when the granular material 6 to be inspected is in an image acquisition environment for eliminating false targets, and when the light and dark stripes of the grating assembly 3 and the granular material 6 to be inspected move relative to each other (for example, relative movement in the horizontal direction), the camera device 5 captures multiple (two or more) inspection images of the granular material to be inspected. In one example, the camera device 5 captures the inspection image when the granular material quality inspection device controls the light and dark stripes to move horizontally and the granular material to be inspected is stationary, for example, when the granular material quality inspection device controls the horizontal movement mechanism to drive the grating plate to move horizontally so that the light and dark stripes on the grating plate move horizontally relative to the granular material 6 to be inspected. The camera device 5 captures the inspection image. In another example, the camera device 5 can also capture the inspection image when the granular material quality inspection device controls the granular material 6 to be inspected to move horizontally but the light and dark stripes are stationary, for example, the granular material quality inspection device drives the light-transmitting table 10 or the tray on the light-transmitting table 10 to move horizontally. In one embodiment, the camera device 5 can capture multiple inspection images at preset time intervals.

[0082] In one embodiment, the camera device 5 includes a photosensitive sensor (such as CCD or CMOS), and the camera device 5 uses the photosensitive sensor to convert the light received by the camera device 5 into a detection image. It should be noted that the number of the camera devices 5 can be one or two or more. Using two or more camera devices to obtain detection images from different positions can improve detection accuracy. In the following embodiments, the number of the camera device 5 is described as one.

[0083] In one embodiment, in order to display the detection image captured by the camera device 5 in real time, the pellet quality detection device also includes a display device that is connected to the camera device for displaying the detection image. The display device is exemplified by a display screen or a touch screen, or a computer device including a display screen, such as a desktop computer, a laptop computer, or a tablet computer. In one example, the display device is configured on the base. In another example, the display device can also be configured separately as an auxiliary device independent of the pellet quality detection device, so that the operator can operate it to browse the detection image captured by the camera device in real time.

[0084] In one embodiment, when the light and dark stripes of the grating component 3 and the granular material 6 to be inspected move relative to each other (for example, relative movement in the horizontal direction), the detection image displayed in real time on the display screen is a dynamic picture. In the detection image captured by the camera device 5, due to the effects of the transmitted light and the reflected light, the refracted grating stripe features are presented on the transparent granular material to be inspected. The image features of the granular material to be inspected that are presented as grating stripe features will show dynamic changes in the picture due to the relative movement of the light and dark stripes of the grating component 3 and the granular material to be inspected 6. For example, different feature changes appear in the same position or the same granular material to be inspected in the detection image at different times. In this process, even if the granular material to be inspected 6 is in the image acquisition environment for eliminating pseudo targets, the detection image captured by the camera device still has residual features. There are some pseudo targets that are shadows and / or black spots. Since they are pseudo targets derived from illumination, when the light and dark stripes of the grating component 3 and the granular material 6 to be inspected move relative to each other and present dynamic changes in the picture, these pseudo targets will be completely eliminated or undergo grayscale changes or changes in the direction of the grayscale changes. On the contrary, in the inspection image captured by the camera device, the physical defects inherent in the granular material to be inspected will not disappear as the light and dark stripes of the grating component 3 and the granular material 6 to be inspected move relative to each other, but will remain in a fixed position and can be easily identified by the algorithm.

[0085] In one embodiment, the pellet quality detection device further includes a control device, which includes an interface unit, a storage unit, and a processing unit. The interface unit is used to communicate with the display device and the camera device to obtain the detection image captured by the camera device, and output a control signal for displaying the detection image to the display device. Further, the interface unit can also communicate with the input device of the pellet quality detection device to obtain information input by the staff. The storage unit is used to store at least one program. The processing unit is connected to the storage device to call the at least one program from the storage device and realize the recognition of the detection image to identify the image features of the true target when executing it.

[0086] In one embodiment, the control device or staff in the pellet quality detection equipment will also adjust the height of the grating plate in the up and down directions, the distance between the reflector and the light-transmitting table, and the brightness of the light source assembly, so that the image features of the pseudo target in the detection image captured by the camera device are weakened or completely eliminated.

[0087] In summary, the pellet quality detection device provided by the present application provides a first intensity light and a second intensity light through a light source component, which not only ensures that the reflector can reflect light of sufficient intensity but also avoids excessive light intensity in the distribution area of ​​the pellets to be detected, which causes overexposure of the detection image of the pellets to be detected. The light divided by the reflector and the grating component can form multi-angle reflected light, so that the divided transmitted light and the multi-angle reflected light construct an image acquisition environment that eliminates false targets. Then, under the condition that the pellets to be detected are in an image acquisition environment that eliminates false targets, by adjusting the height of the grating plate in the up and down directions, the distance between the reflector and the light-transmitting table, and the brightness of the light source component, Under the premise of achieving the technical effect of weakening or even eliminating the image features of the false target and showing the image features of the real target, the detection and analysis are carried out using the detection image captured by the camera device, thereby reducing the interference of shadows and black spots on the detection of particle defects; in addition, the present application also drives the grating plate horizontally to identify possible residual shadows and black spots through multiple detection images; furthermore, the outline of the stripes in the grating component provided by the present application is different from the outline of the transparent material to be inspected particle, so that it can avoid the inability to distinguish whether the light change position is above the particle to be inspected or outside the particle to be inspected due to the stripe outline being the same as the particle outline to be inspected, thereby improving the accuracy of the quality inspection results of the transparent material to be inspected particle.

[0088] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A pellet quality detection device, characterized in that: include: A machine base, comprising a light-transmitting table for placing the granular materials to be inspected and a receiving space located below the light-transmitting table; A light source assembly is arranged in the accommodating space, and is used to provide a light beam of a first intensity and a light beam of a second intensity, wherein the distribution area of ​​the light beam of the first intensity corresponds to the distribution area of ​​the granular material to be inspected and the intensity of the light beam of the first intensity is less than the intensity of the light beam of the second intensity; A grating component is arranged in the accommodation space in parallel with the light-transmitting table and is located between the light source component and the light-transmitting table, and is provided with light and dark stripes corresponding to the particle size of the granular material to be inspected and used to divide the light provided by the light source component; a reflector, arranged on the upper side of the light-transmitting table, for reflecting the split transmitted light to form multi-angle reflected light, so as to construct an image acquisition environment for eliminating false targets by using the multi-angle reflected light and the split transmitted light; and A camera device is suspended on the upper side of the light-transmitting table to capture a detection image of the particle to be detected when the particle to be detected is in the image acquisition environment for eliminating false targets, so as to highlight the image features of the true target of the particle to be detected in the detection image.

2. The pellet quality detection device according to claim 1, characterized in that: The true target is a physical defect in the granular material to be inspected; the false target includes at least one of the following: a shadow produced by light irradiating the granular material to be inspected, a shadow produced on the edge of the granular material to be inspected due to the mutual influence between the granular materials to be inspected, and a black spot produced by local insufficient illumination caused by refraction and / or reflection of light on the granular material to be inspected made of transparent material.

3. The pellet quality detection device according to claim 1, characterized in that: The light source assembly comprises a planar light source for emitting light of second intensity and a dark light-transmitting plate covering the upper side of the planar light source for reducing the light of second intensity to provide light of first intensity.

4. The pellet quality detection device according to claim 3, characterized in that: The dark light-transmitting plate covers the surface of the planar light source or is arranged between the planar light source and the grating component.

5. The pellet quality detection device according to claim 3, characterized in that: The dark light-transmitting plate covers the lower surface of the grating component to move synchronously with the grating component.

6. The pellet quality detection device according to claim 3, characterized in that: The length and width of the dark light-transmitting plate are larger than the length and width of the distribution area of ​​the to-be-tested granular material on the light-transmitting table and smaller than the length and width of the planar light source.

7. The pellet quality detection device according to claim 3, characterized in that: The dark light-transmitting plate is a light-transmitting black film.

8. The pellet quality detection device according to claim 1, characterized in that: The light source assembly comprises a planar light source, wherein the planar light source is provided with a dark light region for emitting light of a first intensity and a bright light region surrounding the dark light region for emitting light of a second intensity.

9. The pellet quality detection device according to claim 8, characterized in that: The length and width of the dark light area are greater than the length and width of the distribution area of ​​the to-be-tested granular material on the light-transmitting table.

10. The pellet quality detection device according to claim 1, characterized in that: The grating assembly includes a grating plate with light and dark stripes and a lateral movement mechanism for driving the grating plate to move lateraly so that the light and dark stripes thereof dynamically divide the light provided by the light source assembly.

11. The pellet quality detection device according to claim 10, characterized in that: The grating assembly comprises a lifting and adjusting mechanism for driving the grating plate to move vertically so as to adjust the distance between the grating plate and the light-transmitting table.

12. The pellet quality detection device according to claim 10, characterized in that: The grating assembly includes a mounting mechanism disposed in the base for fixing the grating plate, and the mounting mechanism is connected to the lateral movement mechanism to drive the grating plate to move lateraly under the drive of the lateral movement mechanism.

13. The pellet quality detection device according to claim 1, characterized in that: The light and dark stripes include light stripes and dark stripes that are parallel to each other, wherein the light stripes and the dark stripes are arranged alternately and the light and dark stripes include at least one stripe direction.

14. The pellet quality detection device according to claim 1, characterized in that: The contour of at least one of the light and dark stripes is different from the contour of the granular material to be inspected, and / or the stripe direction of at least one of the light and dark stripes is different from the contour direction of the granular material to be inspected.

15. The pellet quality detection device according to claim 1, characterized in that: The bottom of the reflector is close to the upper surface of the light-transmitting table to provide reflected light of sufficient intensity for the surface of the granular material to be inspected.

16. The pellet quality detection device according to claim 1, characterized in that: The reflector is arranged on a frame which can be raised and lowered to adjust the distance between the reflector and the granular material to be inspected.

Images