Granule automatic detection equipment

Abstract

The utility model discloses granule automatic detection equipment which comprises a first conveying device for conveying granules to a feeding port of the first conveying device in a granule-by-granule tiling manner, and a second conveying device which is arranged at the feeding port in a bearing manner and is provided with a transparent conveying belt, the detection device is arranged at the detection station and is used for carrying out special-shape and different-color detection on the granules passing through the detection station; wherein the feeding speed of the transparent conveyor belt is greater than the feeding speed of the feeding port, so that the granules passing through the detection station meet the detected granule distance requirement; according to the detection device, provided transmission light with alternate light and shade and multi-direction surface light located above the aggregates are utilized to irradiate combined light on the surfaces of the aggregates, so that an image acquisition environment capable of eliminating false targets is constructed for the to-be-detected aggregates, and the online detection efficiency of the aggregates can be improved while the detection accuracy is improved; and the defective granules are sorted by arranging the sorting unit.

Description

Technical Field

[0001] The present application relates to the technical field of visual quality inspection, and in particular to an automatic inspection device for granular materials. 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 all be made from pellets (or granular materials) of the corresponding materials. However, due to the influence of raw materials or the inevitable inclusion of impurities during preparation, discoloration defects often exist in the prepared pellets. For example, plastic pellets often have black spots or discoloration defects of other colors that are different from the color of the pellets themselves. In addition, in actual production, due to defects in the production process, the prepared pellets may also have shaped defects, such as unusual appearances, internal gels, internal bubbles, and other shaped defects. As the raw materials for preparing other products, pellets need to be inspected for discoloration and shaped defects in order to ensure the quality of the products produced using the pellets (such as the uniformity and consistency of the products) and the operating conditions of the equipment during the production process.

[0003] In the process of pellet inspection, especially in batch online inspection of pellets, pellets entering the inspection station are often stacked or crowded with each other, causing collisions between pellets, which affects the inspection. For example, it is not conducive to the judgment of pellet shape. Although the free fall method can be used to detect shape in related technologies, the different weights of the pellets during free fall will cause contact and affect the shape judgment. Alternatively, in related technologies, shape detection and color detection are separated into two separate processes for inspection. For example, color detection is first carried out, and then the pellets are transported to the next process for shape inspection. This method often makes the equipment required for inspection complex and bulky, increases the difficulty of screening and rejection, and reduces inspection efficiency. Therefore, how to provide an online inspection solution that can detect both color and shape defects of pellets at the same inspection station and improve the efficiency and effectiveness of defective particle detection is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] In view of the shortcomings of the related technologies described above, the purpose of this application is to provide an automatic particle detection device for solving the technical problem of detecting discolored and shaped defects in particle materials described in the prior art.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the present application provides an automatic particle detection device in the first aspect, comprising: a first transmission device for transmitting the received particles to its feeding port in a particle-by-particle flat manner; a second transmission device, which is arranged at the feeding port of the first transmission device, and comprises a transparent conveyor belt for receiving the particles from the feeding port, and the transparent conveyor belt is used to transport the received particles to the discharge end of the second transmission device after detection; wherein the feeding speed of the transparent conveyor belt is greater than the feeding speed of the feeding port of the first transmission device, so that the particles passing through the detection station meet the particle spacing requirements of the detection; the detection device, corresponding to the second The transmission device is configured to detect the granular materials passing through the detection station; it includes a first light source irradiation unit configured at the lower side of the detection station for providing alternating light and dark transmitted light, a second light irradiation unit configured at the upper side of the detection station for providing multi-directional surface light, and a camera device configured at the upper side of the second light irradiation unit for capturing detection images of the granular materials passing through the detection station, wherein the camera device is used to capture the detection images of the granular materials in an image capture environment established by the multi-directional surface light and the alternating light and dark transmitted light to eliminate false targets, so as to highlight the image features of the true targets of the granular materials in the detection images.

[0006] To sum up, the automatic particle detection equipment provided by the present application, through the transparent conveyor belt in the second output device arranged at the feeding port of the first transmission device, transports the received particles to the discharge end of the second transmission device after detection, and the feeding speed of the transparent conveyor belt is greater than the feeding speed of the feeding port of the first transmission device, so that the particles passing through the detection station meet the particle spacing requirements of both special-shaped and special-color detection. In this way, the influence of no spacing between the particles on the detection accuracy of special-colored defects and special-shaped defects is avoided, especially the influence on the detection accuracy of special-shaped defects is avoided, so that the special-colored defects and special-shaped defects of the particles can be detected at the same detection station without the need for separate detection at the front and rear detection stations; and the separate sorting and storage of the special-colored and special-shaped defect particles are realized by configuring the sorting unit, thereby improving the sorting efficiency and effect. In addition, the technical solution provided by the present application establishes an image acquisition environment for eliminating false targets by providing multi-directional surface light and alternating light and dark transmitted light at the detection station, so that the camera device can capture multiple detection images of the granular materials passing through the detection station in the image acquisition environment for eliminating false targets, so as to highlight the image features of the true targets of the granular materials in the detection images, thereby eliminating the interference of shadows and black spots derived from illumination on the detection of granular defects to further improve the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The specific features of the present application are set forth in the appended claims. The features and advantages of the present invention can be better understood by referring to the exemplary embodiments described in detail below and the accompanying drawings. A brief description of the drawings is as follows:

[0008] Figure 1 Shown is a schematic diagram of the principle of an automatic particle detection device in one embodiment of the present application.

[0009] Figure 2 Shown is a schematic diagram of the principle of a second transmission device and a detection device configured corresponding to the second transmission device in one embodiment of the present application.

[0010] Figure 3 Shown is a schematic diagram of the distribution area of ​​the first and second intensity lights in one embodiment of the present application.

[0011] Figure 4 and Figure 5 Schematic diagrams showing light and dark stripes provided on the light source assembly in different embodiments of the present application are shown respectively.

[0012] Figure 6 FIG. 1 is a schematic structural diagram of a light-transmitting cover in one embodiment of the present application at a certain viewing angle.

[0013] Figure 7 Shown is a schematic diagram of the principle of an automatic particle detection device in another embodiment of the present application.

[0014] Figure 8 Shown is a schematic diagram of the principle of a control device in one embodiment of the present application. DETAILED DESCRIPTION

[0015] The following specific embodiments of the present application are illustrated, and those familiar with the technology can easily understand the advantages of the present application and the technical effects that can be achieved from the contents disclosed in this specification. In the following description, some embodiments may refer to the accompanying drawings. It should be understood that other embodiments without accompanying drawings may also be used, and changes in specific structures, parts or mechanisms, components and operations 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 published in this application. The terms used here are only for describing specific embodiments and are not intended to limit the present application.

[0016] It should also be understood that when an element such as a layer, region, or substrate is referred to as being "on" another element or extending "onto" another element, the element may be directly on the other element or directly extend onto the other element, or there may be intermediate elements. Conversely, when an element is referred to as being "directly on" another element or "directly extending onto" another element, there are no intermediate 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 intermediate elements. Conversely, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intermediate elements. Furthermore, the term "coupled" generally means a physical, mechanical, magnetic, and / or electrical coupling or connection, and in the absence of specific language to the contrary, does not exclude the presence of intermediate elements between coupled or associated items.

[0017] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe the relationship of one element, layer or region to another element, layer or region as shown in the figures. It will be understood that these terms are intended to cover different device orientations other than the orientation depicted in the figures. In this application, the terms "vertical", "horizontal" and "parallel" are defined as including ±10% of the standard definition. For example, vertical usually refers to an angle of 90° relative to a reference line, but in this application, vertical refers to a situation within 80° to 100°. Unless otherwise expressly stated, comparative quantitative terms (such as "above" and "below") are intended to cover the concept of equality. As an example, "above" can mean not only "greater than" in a mathematical sense, but also "equal to". "Between" not only refers to the interval, space or distance within two ends, but also includes the two ends themselves unless otherwise specified. 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 automatic particle detection equipment in the embodiments of the present application, the side of the camera device of the various devices, components, parts, structures, or mechanisms in the embodiments of the present application that is close to the camera device of the automatic particle detection equipment 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.

[0018] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit this application. When used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, 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 preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof.

[0019] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will also be understood that the terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant art, and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such in this document.

[0020] Unless otherwise expressly stated, comparative quantitative terms such as "above" and "below" are intended to encompass equivalent concepts. For example, "above" may not only mean "greater than" in a mathematical sense, but may also mean "equal to."

[0021] 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, and are not used to define the order, priority, or importance of multiple elements. For example, a first transmission device can be referred to as a second transmission device, and similarly, a second transmission device can be referred to as a first transmission device without departing from the scope of the various described embodiments. The first transmission device and the second transmission device are both describing a transmission device, but unless the context clearly indicates otherwise, they are not the same transmission device.

[0022] As described in the background technology, the current method for detecting discolored defects and shaped defects of pellets is to first detect discolored defects and then detect shaped defects, which results in a larger size of the detection equipment and lower detection efficiency. In addition, research has found that since shaped defects require spacing between pellets, if the method for detecting discolored defects and shaped defects of pellets is to first detect discolored defects and then gradually increase the spacing between pellets before detecting shaped defects, it is impossible to detect discolored defects and shaped defects at the same detection station. In particular, when detecting pellets, special equipment is usually used to provide The pellets are illuminated in a lighting environment and the pellet images are collected for detection and analysis. However, since the light irradiates the pellets, shadows of the pellets or shadows of the edges of the pellets are often formed around the pellets. Moreover, when the pellets are transparent, the light between the pellets or between the uneven textures inside the pellets will form areas of insufficient light on the surface of the pellets due to mutual refraction and / or reflection, thereby presenting black spots. In subsequent image analysis, the above shadows or black spots are often identified as different-colored defects or different-shaped defects of the pellets, thereby causing interference from false targets and reducing the accuracy of defect detection. Therefore, how to make the detection equipment able to eliminate the interference of shadows and black spots derived from light on the detection of pellet defects and detect different-colored and different-shaped defects of the pellets at the same detection station, especially how to make the characteristics of the real target visible and generate feature alienation with the false target, not only to reduce the size of the detection equipment but also to improve the accuracy of detection, and also to create conditions for the simultaneous sorting and screening of different-colored and different-shaped defect particles, is the technical problem that this application focuses on.

[0023] In view of this, some embodiments provided in the present application disclose an automatic particle detection device, which transports the received particles to the discharge end of the second transmission device after detection through a transparent conveyor belt in a second output device that is arranged at the feeding port of the first transmission device, and the feeding speed of the transparent conveyor belt is greater than the feeding speed of the feeding port of the first transmission device, so that the particles passing through the detection station meet the particle spacing requirements of both special-shaped and special-colored detection. In this way, the influence of the lack of spacing between the particles on the detection accuracy of special-colored defects and special-shaped defects is avoided, especially the detection accuracy of special-shaped defects is avoided. The effect of degree is eliminated, and thus the different-color defects and special-shaped defects of the granular materials can be detected at the same inspection station, thereby reducing the size of the inspection equipment; the inspection device arranged at the inspection station establishes an image acquisition environment that eliminates false targets through multi-directional surface light and alternating light and dark transmitted light, and then the camera device of the inspection device can capture the inspection image of the granular materials passing through the inspection station in the image acquisition environment that eliminates false targets to highlight the image features of the true targets of the granular materials in the inspection image, thereby eliminating the interference of shadows derived from illumination and black spots of transparent granular materials on the granular material defect detection to further improve the accuracy of detection.

[0024] The automatic pellet detection equipment described in this application is a device that can automatically transfer pellets to a detection station and can capture detection images of the pellets at the detection station. The control device in the automatic pellet detection equipment or the computer device connected to the automatic pellet detection equipment can use the detection image to obtain the detection results of the pellets.

[0025] The term "pellets" refers to granular particles produced by a polymer granulation process, which can be used to produce products of the corresponding material. The granules can be made of resin or plastic. For example, resin granules can be used to produce resin products such as resin crafts, resin parts, and resin films; for another example, plastic granules can be used to produce plastic products such as plastic containers, plastic toys, and plastic parts. The granules can be transparent, translucent, or opaque, in either natural or colored form.

[0026] In this application, the term "particle distance" refers to the distance between particles. For example, if multiple particles are scattered or distributed in a plane or in the same area, the size of the particle distance between the particles indicates the density of the particles on the surface.

[0027] See also Figure 1 , shows a schematic diagram of the principle of an automatic pellet inspection device in one embodiment of the present application. As shown in the figure, the automatic pellet inspection device includes a first conveyor device 1, a second conveyor device 2, and a detection device 3. The first conveyor device 1 is used to transfer the received pellets 4 to its feed port in a flat manner, one pellet at a time. The feed port is the outlet of the first conveyor device 1 for feeding the pellets to the next level, namely the second conveyor device 2. The second conveyor device 2 includes a transparent conveyor belt 20 for receiving the pellets 4 from the feed port. The transparent conveyor belt 20 is used to transport the received pellets 4 to the discharge end of the second conveyor device 2 after inspection. The detection device 3 is configured to correspond to the second conveyor device 2 and is used to inspect the pellets 4 passing through the inspection station. For ease of explanation, the end of the first conveyor device 1 used to receive the pellets 4 is referred to as the input end, and the end opposite to the input end is referred to as the output end, which can also be referred to as the feed port. The end of the second conveyor device 2 used to receive the pellets 4 is referred to as the feed end, and the end opposite to the feed end is referred to as the discharge end.

[0028] In some embodiments, the user can directly input the pellets into the input end of the first conveying device, or input the pellets into the first conveying device through a feeding device, or input the pellets into the first conveying device through a vibrating conveying device located at the input end of the first conveying device. In the following embodiments, the method of inputting the pellets into the first conveying device through a feeding device is used as an example.

[0029] like Figure 1 As shown, the automatic pellet inspection equipment further includes a discharge device 5 located at the input end of the first conveying device 1. The discharge device 5 is used to convey the pellets to the first conveying device 1. For example, the discharge device 5 conveys the pellets to the input end of the first conveying device 1 (e.g., the input end of the feed trough 10 described below). In one embodiment, the discharge device 5 includes a hopper 50 for receiving the pellets, a discharge pipe 51 connected to the hopper 50, and a height adjustment device 52 mounted on the discharge pipe 51 for adjusting the distance between a discharge port 510 of the discharge pipe 51 and the first conveying device 1. Specifically, the height adjustment device 52 adjusts the distance between the discharge port 510 of the discharge pipe 51 and the first conveying device 1 so that the distance between the discharge port 510 and the first conveying device 1 is greater than zero, thereby allowing the pellets to be conveyed from the discharge port 510 to the first conveying device 1, thereby enabling the discharge device 5 to feed the pellets. When feeding is completed, the height adjustment device 52 is adjusted so that the distance between the discharge port 510 and the first transmission device 1 is 0, thereby closing the discharge port 510 and stopping feeding. Furthermore, the height adjustment device 52 adjusts the discharge speed of the discharge port 510 by adjusting the distance. The height adjustment device 52 can also adjust the discharge speed / discharge volume of the discharge port 510 by adjusting the distance between the discharge port 510 and the first transmission device 1. For example, a larger distance means a larger discharge volume and a larger discharge speed, while a smaller distance means a smaller discharge volume and a smaller discharge speed. In other embodiments, in order to reduce the complexity of the equipment, the discharge device may also include only a hopper and a discharge pipe connected to the hopper.

[0030] In one embodiment, the hopper 50 is used to receive pellets. For example, the user delivers the pellets into the hopper 50 and the pellets are then delivered to the discharge pipe 51 through the hopper 50. The hopper 50 may be Figure 1 The conical hopper shown may also be a square-conical hopper or other hopper, and the shape of the hopper is not limited.

[0031] In one embodiment, the feed pipe 51 is connected to the hopper 50 and is used to convey the pellets through the feed opening 510 of the feed pipe 51 to the first conveying device 1. Furthermore, in one example, the feed pipe 51 is a curved feed pipe, thereby forming a curved feed channel, improving the fluidity of the pellets and preventing blockage or impact during pellet feeding. For example, the feed pipe 51 includes, from top to bottom, a first vertical pipe, an inclined pipe connected to the first vertical pipe, and a second vertical pipe connected to the inclined pipe, thereby forming a curved feed pipe.

[0032] Furthermore, to reduce dust or impurities transported to the first conveying device, the unloading device 5 further includes a dust removal pipeline 53 connected to the unloading pipe 51 for dust removal. Specifically, in addition to the unloading pipe 51, an additional dust removal pipeline 53 is provided in the unloading device. The connection between the dust removal pipeline 53 and the unloading pipe 51 is configured with a mesh structure, so that dust or impurities carried by the pellets can be discharged from the mesh structure to the dust removal pipeline 53.

[0033] In one embodiment, the height adjustment device 52 is sleeved on the feeding tube 51 to drive the feeding tube 51 and the hopper 50 to move up and down. Figure 1 As shown, the height adjustment device 52 includes a support column 520, an adjustment member 521, and a connecting member 522. Specifically, the support column 520 is configured on the automatic granular material detection device, for example, it is configured on the base (not shown) of the automatic granular material detection device. One end of the connecting member 522 is sleeved on the support column 520 and the other end is sleeved on the discharge pipe 51. The adjustment member 521 is connected to the connecting member 522, and the connecting member 522 can be moved on the support column 520 through the adjustment member 521 to adjust the distance between the discharge port 510 of the discharge pipe 51 and the first transmission device 1. It should be noted that the present application does not limit the structure of the height adjustment device 52. In other embodiments, the height adjustment device can also be an adjustment device based on a screw rod and a knob, or an adjustment device based on a motor drive. For example, the user inputs the required distance between the discharge port 510 and the first transmission device 1 into the automatic granular material detection device, and the control device of the automatic granular material detection device automatically controls the height adjustment device to move up and down.

[0034] The first transmission device is used to transmit the received pellets to its feeding port in a particle-by-particle flat manner. Specifically, the first transmission device receives pellets from its input end and transmits the received pellets to its feeding port in a particle-by-particle flat manner. Wherein, the particle-by-particle flat manner refers to arranging the pellets into a layer instead of stacking them together. It should be noted that the present application does not limit the pellets to being in a particle-by-particle flat state at every position during the transmission process. It only requires that the pellets be in a particle-by-particle flat state at the feeding port. Moreover, the present application does not limit all pellets to being strictly arranged in a layer at the feeding port without overlap. It only requires that the number of overlaps does not affect the detection accuracy of the automatic pellet detection equipment. For example, during the transmission process, due to the interaction between the pellets, the accuracy limitation of the first transmission device, etc., there may be overlap between a very small amount of pellets. It should be noted that the first transmission device can be a transmission device that uses vibration transmission or a transmission device that uses a conveyor belt transmission. In the following embodiments, the first transmission device is described as a transmission device that uses vibration transmission.

[0035] like Figure 1 As shown, in one embodiment, the first transmission device 1 includes a feeding trough 10 and a driving device 11 for driving the feeding trough 10 to vibrate. The driving device 11 is used to drive the feeding trough 10 to vibrate by direct vibration so as to transmit the pellets 4 to the feeding port in a flat manner. Specifically, the driving device drives the feeding trough 10 to vibrate by direct vibration so as to enable the feeding trough 10 to vibrate the pellets 4 along the feeding direction ( Figure 1 The first conveying device 1 moves in the direction indicated by the arrow, thereby transferring the pellets 4 to the feeding port of the first conveying device 1 in a flat, pellet-by-pellet manner. In one embodiment, the driving device 11 is configured as a linear vibrator. The feed trough 10 is configured as a linear trough arranged along the feeding direction. In one example, the surface of the feed trough 10 is smooth to reduce the resistance to transferring the pellets 4.

[0036] In order to reduce the influence of dust, external impurities, etc. on the detection, the feed trough is also equipped with a dust removal section for dust removal. The number of the dust removal sections can be one or more. In the following embodiments, the feed trough is equipped with a dust removal section as an example. Figure 1 As shown, the dust removal section 100 is provided on the feed trough 10 adjacent to the feed opening of the first conveying device 1 (i.e., the feed opening of the feed trough 10). In other examples, the dust removal section can be located elsewhere on the feed trough. By providing the dust removal section, dust or foreign matter that falls off the pellets as they pass through it can be removed, thereby improving the accuracy of the automatic pellet inspection equipment in detecting discolored and shaped defects.

[0037] In one embodiment, the dust removal section 100 is a mesh structure disposed on the feed chute 10. Dust, impurities, and fine particles that fall off during the vibrating movement of the pellets 4 can be discharged through the mesh structure. The mesh openings of the mesh structure are smaller than the size of the pellets 4 to prevent the pellets 4 from being discharged through the mesh structure. It should be noted that due to the high friction between the pellets 4 and the mesh structure, the mesh-structured dust removal section can also serve as a damping section to differentiate the pellet movement speed, thereby facilitating the separation of the pellets.

[0038] In one embodiment, a dust collection channel 101 for collecting dust is further provided on the lower side of the dust removal section 100. The dust collection channel has a dust exhaust outlet, which can discharge dust or impurities in the dust collection channel 101 from the dust exhaust outlet to a dust box provided inside or outside the automatic particle detection equipment for collection.

[0039] In one embodiment, the dust collection channel may be connected to a negative pressure device such as a vacuum pump to remove dust or impurities attached to the surface of the granular material 4 by generating negative pressure adsorption.

[0040] See also Figure 2 Combined with Figure 1 , Figure 2 A schematic diagram illustrating the principle of a second conveying device and a corresponding detection device configured for the second conveying device in one embodiment of the present application is shown. As shown in the figure, pellets 4, which are delivered to the feed opening of the first conveying device 1 in a flat, one-by-one manner, fall into the feed end of the second conveying device 2. Specifically, the second conveying device 2 is disposed adjacent to the feed opening of the first conveying device 1 to receive the pellets 4 that fall from the feed opening of the first conveying device 1. For example, the feed end of the second conveying device 2 is adjacent to the feed opening of the first conveying device 1 to receive the pellets 4 that fall.

[0041] like Figure 2As shown, the second conveyor 2 includes a transparent conveyor belt 20 for receiving pellets 4 from the feed port. The transparent conveyor belt 20 is used to transport the received pellets 4 to the discharge end of the second conveyor 2 after inspection. Specifically, the transparent conveyor belt 20 moves in the feeding direction to drive the pellets 4 received from the feed port of the first output device 1 through the inspection station and then to the discharge end of the second conveyor 2. The feeding speed of the transparent conveyor belt 20 is greater than the feeding speed of the feed port of the first conveyor 1, so that the pellets 4 passing through the inspection station meet the inspection requirements. In other words, by controlling the feeding speed of the transparent conveyor belt 20 to be greater than the feeding speed of the feed port of the first conveyor 1, the spacing between the pellets 4 when they fall into the transparent conveyor belt 20 is greater than the spacing between the pellets 4 on the first conveyor 1. This ensures that the spacing between the pellets 4 on the transparent conveyor belt 20 is widened, so that the pellets 4 passing through the inspection station meet the particle spacing requirements for both irregular shape and irregular color inspection. The feeding speed refers to the speed of movement of the transparent conveyor belt 20, that is, the speed of movement of the pellets relative to the stationary transparent conveyor belt 20. The feeding speed refers to the speed of movement of the pellets 4 at the feeding port of the first transmission device 1. The particle spacing requirement refers to the spacing between two adjacent pellets 4. In this way, by preventing the pellets passing through the inspection station from touching and affecting the detection of discolored and shaped defects, especially avoiding the impact on the detection of shaped defects, it is ensured that discolored and shaped defects can be detected at the same inspection station, thereby improving the accuracy of discolored and shaped defect detection, increasing the integration of the equipment, and reducing the size of the equipment. In addition, because the pellets meet the particle spacing requirement, the accuracy of locating the target pellets (pellets with discolored defects and pellets with shaped defects) is improved, facilitating classification and collection. Furthermore, because the pellets do not move relative to the transparent conveyor belt on the transparent conveyor belt, the accuracy of locating the target pellets can be further improved, and the position of the pellets arriving at the sorting point can be more accurately located.

[0042] In one embodiment, considering that the pellets may move relative to each other on the transparent conveyor belt due to their own moving speed when they just fall into the second conveyor, in order to avoid the relative movement affecting the detection accuracy and positioning of the target pellets, the detection station (the position where the pellets can be detected by the detection device) can be located in the middle area of ​​the second conveyor, or close to the discharge end of the second conveyor, so as to improve the accuracy of detecting and positioning the target pellets. For example, Figure 2 As shown, the detection station is located in the middle area of ​​the transparent conveyor belt 20.

[0043] In one embodiment, the transparent conveyor belt has a high light transmittance, allowing the alternating light and dark light provided by the first light source illumination unit to pass through, thereby irradiating the pellets on the transparent conveyor belt. In one example, the light transmittance of the transparent conveyor belt is greater than 80%. To ensure the high light transmittance of the transparent conveyor belt, the transparent conveyor belt is made of a light-transmitting material such as polyurethane (TPU), polyethylene terephthalate (PET), or polyvinyl chloride (PVC).

[0044] In one embodiment, the second transmission device 2 further comprises a shaft assembly, which drives the transparent conveyor belt 20 to move in the feeding direction under the drive of a motor. Figure 2 As shown, the shaft assembly includes a driving shaft 21 and a passive shaft 22. The driving shaft 21 is used to drive the transparent conveyor belt 20 to move under the drive of the motor. The passive shaft 22 is used to support the transparent conveyor belt 20 and rotate along with the movement of the transparent conveyor belt 20 so that an installation space 23 for installing the first light source irradiation unit 30 is formed inside the supported transparent conveyor belt 20. The number of the passive shafts 22 can be multiple, such as Figure 2 As shown, there are four passive shafts 22, the active shaft 21 abuts against the outer side of the transparent conveyor belt 20 and the four passive shafts 22 abut against the inner side of the transparent conveyor belt 20 to support the transparent conveyor belt 20 and form the installation space 23 on the inner side of the transparent conveyor belt 20. Figure 2 In the illustrated embodiment, disposing the driving shaft 21 outside the transparent conveyor belt 20 can structurally form a specific discharge port space for disposing subsequent conveying channels and sorting devices for air-jet sorting.

[0045] In one embodiment, one of the passive shafts 22 can be configured to be movable in the horizontal direction. For example, the passive shaft 22 can be configured to be horizontally adjustable to adjust the tension of the transparent conveyor belt 20 during operation to compensate for the relaxation of the transparent conveyor belt 20 due to long-term stress during long-term operation, which is not conducive to ensuring the unevenness of the transparent conveyor belt 20 at the detection station. The unevenness of the detection station may cause the particles to gather toward the lower area, resulting in the particles not meeting the particle spacing requirements for both irregular shape and irregular color detection. In this embodiment, the tension adjustment or control of the transparent conveyor belt 20 can be achieved by providing a tension sensor or a passive tension compensation mechanism.

[0046] like Figure 1As shown, the transparent conveyor belt 20 drives the pellets 4 to move so that the pellets 4 pass through the inspection station and are inspected by the inspection device 3, and then are conveyed to the discharge end of the second conveyor device 2 (i.e., the discharge end of the transparent conveyor belt 20). In one embodiment, the inspection device 3 is configured to correspond to the second conveyor device 2 and is used to inspect the pellets 4 passing through the inspection station. Specifically, the inspection device 3 captures an inspection image of the pellets 4 passing through the inspection station to obtain an inspection result. For example, the control device of the automatic pellet inspection device or a computer device connected to the automatic pellet inspection device performs image recognition based on the inspection image detected by the inspection device to obtain an inspection result. The inspection result includes whether the pellets have defects. Further, the inspection result of the pellets can also include the type of defect, including discolored defects and / or irregularly shaped defects. Furthermore, the inspection result of the pellets can also include the type of discolored defects and / or irregularly shaped defects, and examples of the type of discolored defects include black spots, impurities, or colored spots. Examples of the types of irregular defects include large particles, small particles, snake-skin particles, tailing particles, flocs, or particles with bubbles.

[0047] In one embodiment, the basis for judging the irregular defects can refer to the definition of the Chinese national standard SH / T1541-2006 Thermoplastic Plastic Granule Appearance Test Method, but is not limited thereto. Other irregular defect particles can be identified, such as forked particles, glass fiber particles, holes, depressions, core-coated particles, broken particles, etc.

[0048] In one embodiment, if Figure 2 As shown, the detection device 3 includes a first light source irradiation unit 30, a second light source irradiation unit 31, and a camera device 32. The first light source irradiation unit 30 is configured at the lower side of the detection station to provide alternating light and dark transmitted light, the second light source irradiation unit 31 is configured at the upper side of the detection station to provide multi-directional surface light, and the camera device 32 is configured at the upper side of the second light source irradiation unit 31 to capture detection images of the granular material 4 passing through the detection station. The multi-directional surface light and the alternating light and dark transmitted light establish an image acquisition environment that eliminates false targets. Furthermore, the detection image of the granular material 4 captured by the camera device 32 in the false target elimination image acquisition environment can highlight the image features of the true target of the granular material 4 in the detection image, thereby improving the accuracy of detecting heterochromatic defects and irregular-shaped defects. It should be noted that the transmitted light refers to the light that irradiates the pellets from the bottom side, and the transmitted light can be received by the camera device through the transparent conveyor belt and the pellets; the surface light refers to the light that irradiates the pellets from the top side, and the surface light is received by the camera device after being reflected by the surface of the pellets.

[0049] In one embodiment, the first light source irradiation unit 30 is configured at the lower side of the detection station. Specifically, the first light source irradiation unit 30 is located at the lower side of the detection station and is arranged in the installation space 23 on the inner side (lower side) of the transparent conveyor belt 20. The first light source irradiation unit 30 includes a shell, a light source assembly, and a grating assembly. In order to distinguish it from the shell of the second light irradiation unit described later, the shell of the first light source irradiation unit is referred to as the first shell, and the shell of the second light irradiation unit is referred to as the second shell. Figure 2 As shown, the light source assembly 301 is arranged in the accommodating space of the first shell 300, and is used to provide light of first intensity and light of second intensity. The grating assembly 302 is located between the light source assembly 301 and the light-transmitting surface of the first shell 300. The grating assembly 302 is provided with light and dark stripes related to the particle size of the granular material 4 for dividing the light provided by the light source assembly 301 to provide the alternating light and dark transmitted light, and then the light passes through the granular material 4 from the bottom of the granular material 4 and is received by the camera device 32.

[0050] The first shell includes a light-transmitting surface and a storage space. The first shell is used to store the light source assembly and the grating assembly. Furthermore, the first shell can also be used to prevent dust. In order to distinguish them from the light-transmitting surface and storage space of the second light irradiation unit described later, the light-transmitting surface and storage space of the first light source irradiation unit are referred to as the first light-transmitting surface and the first storage space, and the light-transmitting surface and storage space of the second light irradiation unit are referred to as the second light-transmitting surface and the second storage space. Figure 2 As shown, the first light-transmitting surface 3000 is located at the top of the first shell 300 and is used to transmit light; further, the first light-transmitting surface 3000 is located in the middle area of ​​the top of the first shell 300 corresponding to the detection station.

[0051] In one embodiment, the first light-transmitting surface 3000 is made of a light-transmitting material, such as glass, polymethyl methacrylate (PMMA), polyurethane (TPU), polyethylene terephthalate (PET), or polyvinyl chloride (PVC) with high light transmittance. For example, the light transmittance of the light-transmitting material is greater than 80%.

[0052] like Figure 2As shown, the first accommodating space 3001 formed in the first shell 300 is located on the lower side of the first light-transmitting surface 3000, which is used to accommodate the light source assembly 301 and the grating assembly 302. In addition, the first accommodating space 3001 forms a closed space to shield the influence of the light source outside the device, thereby forming an independent light source projection unit with an independent closed space to provide the granular material with alternating light and dark transmitted light; in a specific embodiment, the first shell 300 is also provided with a heat dissipation assembly for dissipating heat for the light source assembly 301, such as a heat sink and / or a heat dissipation fan.

[0053] The first receiving space 3001 is provided with the light source assembly 301. The light source assembly 301 is configured to provide a light beam of a first intensity and a light beam of a second intensity. The intensity of the first intensity light beam is less than the intensity of the second intensity light beam. For example, the intensity of the first intensity light beam is approximately 20%-70% of the intensity of the second intensity light beam. Specifically, the intensity of the first intensity light beam is approximately 20%, 22.5%, 25%, 30%, 32.5%, 35%, 37.5%, 40%, 42.5%, 45%, 47.5%, 50%, 52.5%, 55%, 57.5%, 60%, 62.5%, or 65%, 67.5%, or 70% of the intensity of the second intensity light beam. In this embodiment, the distribution area of ​​the first intensity light beam includes the projection area of ​​the area where the inspected granular material is located on the bottom of the first housing 300, and the distribution area of ​​the second intensity light beam is located outside the distribution area of ​​the first intensity light beam. The light source assembly 301 can prevent the light intensity in the area where the detected granules are located from being too high, which may cause the detection image of the granules 4 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 light irradiated on the granules has sufficient surface light effect, so that the camera device 32 can capture a clear detection image.

[0054] In one example, see Figure 3 , shows a schematic diagram of the distribution areas of the first and second intensity light beams in one embodiment of the present application. As shown in the figure, the distribution area G of the first intensity light beam is a rectangular area, and the distribution area H of the second intensity light beam is a square ring area located outside the rectangular area. It should be noted that the present application does not limit the shapes of the distribution areas of the first and second intensity light beams. For example, the distribution area of ​​the first intensity light beam can also be a circular area, and the distribution area of ​​the second intensity light beam can be a circular ring area.

[0055] In one embodiment, the light source assembly includes a planar light source and a dark light-transmitting plate. In order to distinguish it from the dark light-transmitting plate of the second light irradiation unit described later, the dark light-transmitting plate of the first light irradiation unit is referred to as the first dark light-transmitting plate, and the dark light-transmitting plate of the second light irradiation unit is referred to as the second dark light-transmitting plate. Figure 2 As shown, the light source assembly 301 includes a plane light source 3010 for emitting a second-intensity light and a first dark light-transmitting plate 3011 located between the plane light source 3010 and the grating assembly 302 for reducing the second-intensity light to provide a first-intensity light. For example, the first dark light-transmitting plate 3011 is located between the plane light source 3010 and the grating plate described later. In other words, in this embodiment, the second-intensity light is emitted by the plane light source 3010, and the first dark light-transmitting plate 3011 is located between the plane light source 3010 and the grating assembly 302. After the second-intensity light is irradiated on the first dark light-transmitting plate 3011, the first dark light-transmitting plate 3011 absorbs part of the light intensity, so that the intensity of the first-intensity light passing through the first dark light-transmitting plate 3011 is less than the intensity of the second-intensity light, and thus the light source assembly 301 can provide the first-intensity light and the second-intensity light.

[0056] It should be noted that the first dark light-transmitting plate 3011 is located between the planar light source 3010 and the grating component 302, which means that the first dark light-transmitting plate 3011 can be Figure 2 The planar light source shown is located on the upper side of the planar light source 3010 and maintains a preset gap with the planar light source 3010; it can also cover the upper surface of the planar light source 3010, for example, the first dark light-transmitting plate 3011 covers the central area of ​​the upper surface of the planar light source 3010; or it covers the lower surface of the grating component 302 to move synchronously with the grating component 302, for example, it covers the lower surface of the grating plate to move synchronously with the grating plate.

[0057] In an embodiment in which 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 first shell 300 includes the projection area of ​​the area where the detected granular material is located at the bottom of the first shell 300, and the first dark light-transmitting plate 3011 cannot cover the entire planar light source 3010, the length and width of the first dark light-transmitting plate 3011 are smaller than the length and width of the planar light source 3010 but larger than the length and width of the area where the detected granular material is located.

[0058] In one embodiment, the light transmittance of the first dark light-transmitting plate 3011 is approximately 20%-70%. For example, the light transmittance of the first dark light-transmitting plate 3011 is approximately 20%, 22.5%, 25%, 30%, 32.5%, 35%, 37.5%, 40%, 42.5%, 45%, 47.5%, 50%, 52.5%, 55%, 57.5%, 60%, 62.5%, or 65%, 67.5%, or 70%. In a specific embodiment, the first dark light-transmitting plate 3011 is a light-transmitting black film. In one example, the required light transmittance 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.

[0059] In one embodiment, the planar light source 3010 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 3010 can also be other types of planar light sources, for example, the planar light source 3010 can also be an OLED planar light source.

[0060] The light source assembly 301 of the present application provides light of the first intensity and light of the second intensity by providing a first dark light-transmitting plate 3011 , thereby reducing the cost of the light source assembly.

[0061] In one embodiment, the first dark light-transmitting plate can also be moved up and down. For example, the first dark light-transmitting plate is disposed on a vertically movable lifting mechanism. Adjusting the lifting mechanism to move the first dark light-transmitting plate up and down can produce different surface image effects on the pellet surface, facilitating the identification of true defects.

[0062] By adjusting or setting the vertical / vertical position of the first darkened light-transmitting plate, different surface lighting effects can be achieved, facilitating the detection of discolored defects in materials with varying light transmittances. Specifically, adjusting or setting the vertical / vertical position of the first darkened light-transmitting plate not only affects the light intensity on the surface of the material but also enhances the surface grayscale of white or light-colored materials. This, in turn, enhances the grayscale of the material's texture, facilitating the detection and extraction of discolored defects, particularly black defects.

[0063] In another embodiment, to reduce the complexity of the light source assembly and thus ease assembly difficulty, the light source assembly may also utilize only a planar light source with zoned controllable light intensity to provide light of the first intensity and the second intensity. Specifically, the planar light source is provided with a dark light region for emitting light of the first intensity and a bright light region surrounding the dark light region for emitting light of the second intensity. The projection area of ​​the dark light region on the bottom of the first housing includes the projection area of ​​the first light-transmitting surface on the bottom of the first housing. In embodiments where the dark light region is a rectangular or square region, the length and width of the dark light region are greater than the length and width of the first light-transmitting surface.

[0064] In yet another embodiment, in order to reduce the complexity of the light source assembly and thus ease assembly difficulty, the light source assembly may also be implemented using a DLP (Digital Light Processing, 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 having a first intensity and a second intensity. Upon receiving a control signal from the controller, the DMD chip illuminates the light source corresponding to each pixel in the projected image onto a light-transmitting surface. The DMD chip appears to be just a small mirror enclosed in a sealed space made of metal and glass. In reality, this mirror is composed of hundreds of thousands or even millions of micromirrors, each of which represents a pixel. 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 controls each optical switch in the DMD chip to enable or disable each micro-lens to reflect light, thereby illuminating the corresponding projected image onto the light-transmitting surface. This allows the camera device located above the automatic particle inspection equipment to receive light reflected from the particle surface and light transmitted by the particle surface, thereby capturing the particle inspection image. For another example, an LCD projection device may include an LCD light source system, wherein the LCD light source system includes an LED light source and an LCD liquid crystal display. The control chip in the LCD projection device projects a projection image having a first intensity and a second intensity onto the light-transmitting surface via the LCD liquid crystal display.

[0065] The light beams of the first intensity and the second intensity emitted by the light source assembly 301 propagate upward and illuminate the grating assembly 302. The grating assembly 302 is disposed in the first receiving space 3001, parallel to the first light-transmitting surface 3000, and located between the first light-transmitting surface 3000 and the light source assembly 301. The grating assembly 302 is provided with light and dark stripes corresponding to the particle size of the granular material 4. These stripes are used to divide the light provided by the light source assembly 301, namely, dividing the light beams of the first intensity and the second intensity simultaneously, thereby forming the alternating light and dark transmitted light beams. The alternating light and dark transmitted light beams refer to alternating bright light regions (white light) and dark light regions (black light).

[0066] Specifically, the light stripes and dark stripes in the light and dark stripes are alternately arranged on the light source assembly 301. 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 passing through the grating assembly 302 to a certain extent, so that the light and dark stripes can divide the light provided by the light source assembly 301 into alternating bright light areas and dark light areas. In one example, the light stripes are white stripes, and the dark stripes are black stripes. For example, see Figure 4 and Figure 5 , which are schematic diagrams showing light and dark stripes provided on the light source assembly in different embodiments of the present application. As shown in the figure, the light and dark stripes on the light source assembly are white stripes and black stripes arranged alternately.

[0067] 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 4 As shown, the light and dark stripes are parallel black and white stripes. In another embodiment, the light and dark stripes are parallel arc stripes. In another embodiment, the light and dark stripes can also be concentric ring stripes. For example, Figure 5 As shown, the light and dark stripes are concentric black and white circular stripes.

[0068] In one embodiment, the light and dark fringes are related to the particle size of the particles to avoid the difficulty in distinguishing between background image features and particle image features in the detection image due to the light fringes being too large. The background image features are the alternating light and dark features in the detection image that appear due to light that has passed through the light-transmitting surface but not through the particles to be detected.

[0069] Specifically, the correlation between the light and dark stripes and the particle size of the granules means that the width of the light and dark stripes in the alternating direction is correlated with the particle size of the granules. For example, the width of the light and dark stripes in the alternating direction is 0.5 to 3 times the particle size of the granules. The particle size represents the size of the granules. In this embodiment, personnel can replace light and dark stripes of different widths based on the particle size of the granules. For example, this can be accomplished by directly replacing the grating plate described in the following embodiments.

[0070] In order to avoid the difficulty in distinguishing the background image features and the image features of the particles in the detection image due to the stripe contour being the same as the contour of the transparent material particles, the contour of at least one stripe in the light and dark stripes is different from the contour of the particles. In one embodiment, the contour of each stripe in the light and dark stripes is different from the contour of the particles. For example, the contour of a spherical particle is approximately circular, and the contour of a cylindrical particle is approximately rectangular. In the embodiment where the particles are spherical, the contour of the stripes in the light and dark stripes can be as follows: Figure 4 In the embodiment where the pellets are cylindrical, the outline of the stripes in the light and dark stripes can be arc-shaped or as shown. Figure 5 The circular shape shown.

[0071] To avoid difficulty distinguishing between background image features and pellet image features in the detection image due to the stripe direction being the same as the outline direction of the transparent material, the stripe direction of at least one of the light and dark stripes is different from the outline direction of the material. In other words, the stripe direction of at least one of the light and dark stripes is at an angle to the outline direction of the material. The stripe direction is the direction in which the stripe extends. The outline direction of the material refers to one or more directions along which the outline of the material lies. For example, if the outline of the material is a rectangle, the outline direction includes the directions of the four sides of the rectangle.

[0072] It should be noted that the light and dark stripes may also include at least two stripe directions to form a more variety of alternately arranged parallel stripe groups to accommodate more transparent material particles with a variety of contour shapes, thereby avoiding synchronous changes between the stripe changes in the transparent area of ​​the particles and the stripe changes in the background area. Figure 4 The stripes shown have 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.

[0073] In one embodiment, the light and dark stripes are described in detail using an example in which the light and dark stripes include stripes in two directions. In one example, a portion of the light and dark stripes are parallel to each other and all stripes are oriented in a first direction, while another portion of the light and dark stripes are parallel to each other and all stripes are oriented in a second direction, with the first and second directions being angled. Based on the description of the above embodiment, the light and dark stripes can be configured in three or more directions.

[0074] In one example, the grating assembly includes a grating plate having the light and dark stripes, and the granular material driven by the transparent conveyor belt moves relative to the grating plate, that is, moves relative to the light and dark stripes of the grating plate.

[0075] Since the black defects to be detected are close in color to the shadows and black spots of the pellets, it is difficult to distinguish them. In addition, the shadows and black spots of the pellets will also affect the detection of irregular defects. However, since the pellets in this application can move relative to the grating assembly under the drive of the transparent conveyor belt, the obvious changes in light can be used to assist in identifying shadows, black spots, irregular color defects, and irregular shaped defects. The shadow is the shadow formed by the light shining on the pellets or the shadow produced on the edge of the pellets due to the mutual influence between the pellets. The black spots are the areas of insufficient light formed on the surface of the pellets after the light is refracted and / or reflected on the pellets of the transparent material. Specifically, the black spots refer to the areas produced by the refraction and / or reflection of light inside the pellets of the transparent material when the light shines on the pellets of the transparent material. The irregular color defects are inherent irregular color spots (such as black spots) on the pellets. The irregular color spots are usually defects caused by poor preparation process or impurities in the pellets.

[0076] In one embodiment, the grating assembly further includes a lifting and adjusting mechanism for driving the grating plate to move vertically to adjust the distance between the grating plate and the first light-transmitting surface. The vertical direction refers to the up-down direction. In one embodiment, the lifting and adjusting mechanism is connected to the mounting mechanism of the grating plate to drive the grating plate to move vertically. The lifting and adjusting mechanism can be a screw, rack, or synchronous belt structure.

[0077] Adjusting the vertical height of the grating plate equipped with black and white stripes affects the light effect on the surface of the particles, especially producing an image effect of striped light changes on shadows or edges of particles or transparent areas of transparent particles, so that the image features of true defects on the particle surface are visible and have different image features from false defects, which is conducive to the detection and identification of true defect targets.

[0078] See also Figure 2 Combined with Figure 1As shown in the figure, the second light irradiation unit 31 is arranged on the upper side of the detection station to provide multi-directional surface light. The multi-directional surface light is irradiated to the surface of the granular material 4 and is reflected by the surface and then received by the camera device 32. The multi-directional surface light can provide the granular material 4 with richer surface light to improve the accuracy of detection. In one embodiment, the second light irradiation unit 31 includes a second shell 310, a light source 311, and a light-transmitting cover 312. The light source 311 is arranged in the accommodating space of the second shell 310, and is used to emit light to be reflected by the inner surface of the second shell 310. The light-transmitting cover 312 is arranged on the upper side of the light-transmitting surface of the second shell 310, and is used to transmit the light reflected by the inner surface of the second shell 310 to provide the multi-directional surface light.

[0079] like Figure 2 As shown, the second shell 310 includes a second light-transmitting surface 3100 and a second accommodating space 3101 . The second shell 310 is used to accommodate the light source 311 and the light-transmitting cover 312 . The second shell 310 can also be used for dust prevention.

[0080] The second light-transmitting surface 3100 is located at the bottom of the second housing 310 and is used to transmit light. Specifically, the second light-transmitting surface 3100 is adapted to the bottom area of ​​the light-transmitting cover 312. Furthermore, in one embodiment, the top of the second housing 310 also has a third light-transmitting surface 3102 corresponding to the camera device 32. The third light-transmitting surface 3102 is formed on the second housing. In one embodiment, the second light-transmitting surface 3100 or the third light-transmitting surface 3102 is made of a light-transmitting material that is the same or similar to the light-transmitting material described for the first light-transmitting surface 3000 and is not further described here. In another embodiment, the second and third light-transmitting surfaces can be configured as a fully open structure.

[0081] like Figure 2 As shown, the second accommodating space 3101 is located on the upper side of the second light-transmitting surface 3100. In addition, the second accommodating space 3101 forms a closed space to shield the influence of the external light source of the device. In other words, the areas outside the third light-transmitting surface 3102 and the second light-transmitting surface 3100 on the second shell 310 are all non-light-transmitting areas; in a specific embodiment, a heat dissipation component for dissipating heat for the light source 311, such as a heat sink and / or a cooling fan, is also provided in the second shell 310.

[0082] The light source 311 is provided in the second receiving space 3101. The number of the light sources 311 can be one or more. In the following embodiments, the number of the light sources 311 is multiple as an example. Figure 2As shown, two light sources 311 are symmetrically arranged at the bottom of the second accommodating space 3101 . The two light sources 311 are located outside the light-transmitting cover 312 and are used to emit light upwards to be reflected by the inner surface of the second shell 310 .

[0083] In one embodiment, the light source 311 is an LED light source, and further, the LED light source is a light source with adjustable light intensity. In other embodiments, the light source 311 can also be other types of light sources, such as LED lamp beads, light bulbs or fluorescent lamps, and the light source 311 can also be an OLED light source.

[0084] The light-transmitting cover 312 is arranged on the upper side of the second light-transmitting surface 3100, and is used to transmit the light reflected by the inner surface of the second shell 310 to provide the multi-directional surface light to illuminate the surface of the pellets. The multi-directional surface light means that the light passing through the light-transmitting cover 312 includes light from multiple directions, rather than light from the same direction. In one embodiment, the light-transmitting cover includes a lampshade bracket and a light diffuser plate arranged on the lampshade bracket. The lampshade bracket is arranged on the upper side of the second light-transmitting surface. Specifically, the bottom of the lampshade bracket is arranged on the second light-transmitting surface, and the top of the lampshade bracket is arranged around the outside of the third light-transmitting surface 3102; the lampshade bracket has windows around it for installing the light diffuser plate.

[0085] In one embodiment, the lampshade bracket can be in a square brick shape, a square cone shape, or a cone shape. The present application does not limit the structure of the lampshade bracket, as long as the lampshade bracket can provide a window for installing the light diffuser plate and the light diffuser plate disposed on the lampshade bracket can provide multi-directional surface light. In one example, refer to Figure 6 , which is a schematic structural diagram of a light-transmitting cover in one embodiment of the present application at a certain viewing angle. As shown in the figure, the lampshade bracket 3120 of the light-transmitting cover is a square cone, and four light diffusers 3121 are respectively installed around the lampshade bracket 3120. The light diffusers 3121 are used to transmit the reflected light to provide multi-directional surface light.

[0086] In one embodiment, the light diffuser plate is a planar plate-like structure, but is not limited thereto. For example, if the lampshade bracket is conical, the light diffuser plate may also be a curved structure. In one example, the light diffuser plate has a high light transmittance to provide a good light transmission effect and reduce defects such as glare caused by direct light. The light transmittance of the light diffuser plate is, for example, between 70% and 90%. For example, the light transmittance of the light diffuser plate is approximately 70%, 75%, 80%, 85%, or 90%. The material of the light diffuser plate is, for example, polymethyl methacrylate (PMMA), polycarbonate (PC), or polyethylene (PE). Furthermore, in order to make the light passing through the light diffuser plate have more different directions, the light diffuser plate may also be configured as a light diffuser plate with different thicknesses. For example, the light diffuser plate is composed of multiple areas with different thicknesses.

[0087] In one embodiment, the second light irradiation unit 31 further includes a second dark light-transmitting plate (not shown) disposed within the second receiving space 3101 to reduce the intensity of the multi-directional surface light. In one example, the second dark light-transmitting plate is disposed parallel to the light source 311, above the light source 311, and outside the light-transmitting cover 312. In another example, the second dark light-transmitting plate is disposed inside or outside the light-transmitting cover 312, with a predetermined spacing therebetween. In yet another example, the second dark light-transmitting plate is attached to the inside or outside of the light-transmitting cover 312.

[0088] In other embodiments, the second light irradiation unit may also only include a second shell and a reflector. The second shell includes a second light-transmitting surface and a second accommodating space located above the second light-transmitting surface. The second shell in this embodiment is the same as or similar to the second shell described above and will not be described in detail here. The reflector is provided on the upper side of the second light-transmitting surface to reflect the alternating light and dark transmitted light to form multi-directional surface light. Specifically, the alternating light and dark transmitted light propagates to the inner wall of the reflector and is reflected by the inner wall to form multi-directional reflected light. In one example, a reflective coating is coated on the inner side of the reflector. The reflective coating is, for example, a diffuse reflective material, which can change the reflection angle of the light to provide a richer range of reflected light directions.

[0089] In one embodiment, in order to design a simpler structure, the second light irradiation unit may only use a reflector to reflect the alternating light and dark transmitted light, which is reflected by the reflector and then irradiated onto the surface of the pellets.

[0090] Furthermore, in order to adjust the distance between the reflector and the pellets, thereby adjusting the intensity of the multi-directional surface light irradiating the pellets, in one embodiment, the reflector is mounted on a liftable and adjustable frame, for example, the liftable and adjustable frame having a screw structure or a synchronous belt structure. In another embodiment, the reflector can also be screwed onto the lens extension portion of the camera device or the inner top of the second housing, thereby adjusting the distance between the reflector and the pellets.

[0091] The second light source irradiation unit, equipped with the reflector, forms a pair of transmitted and reflected light corresponding to the first light source irradiation unit, jointly illuminating the surface of the pellets. Adjusting the spacing between the reflector, the first dark light-transmitting plate, and the grating plate can achieve a favorable lighting effect on the pellet surface and eliminate shadows between pellets or along the edges of pellets. This further helps eliminate interference from false target points.

[0092] In an embodiment of the present application, the alternating light and dark transmitted light provided by the first light irradiation unit and the multi-directional surface light provided by the second light irradiation unit create an image acquisition environment that eliminates false targets. The image acquisition environment that eliminates false targets is the lighting environment of the pellets. When the pellets are in the image acquisition environment that eliminates false targets and when the pellets move along the transparent belt, the alternating light and dark transmitted light provided by the first light irradiation unit produces grayscale variations in the background of the pellet inspection station, the edges between the pellets, or the transparent areas of the transparent pellets. The characteristics of the deformation of the light and dark stripes and their grayscale variations enable the background, the edges between the pellets, or the transparent areas of the transparent pellets to be identified, respectively. This reduces false targets that interfere with pellet quality inspection. Thus, by creating an image acquisition environment that eliminates false targets and utilizing the relative movement between the pellets and the light and dark stripes, the accuracy of detecting different-color and different-shaped defects is further improved, while preventing pellets passing through the inspection station from contacting and affecting the detection of different-color and different-shaped defects, thereby ensuring that different-color and different-shaped defects can be detected at the same inspection station. In this application, the pseudo target includes a black spot produced by the refraction of light on the pellets, or the pseudo target includes a shadow produced around the pellets by the reflection of light on the pellets, or the pseudo target includes both the aforementioned black spot and the shadow produced around the pellets. In other words, the pseudo target is not a true defect inherent in the pellets (a defect of different color and / or shape), but a false defect caused by illumination. Correspondingly, the true target to be detected is the true defect in the pellets. The shadow, black spot, and defect are the same or similar to those described above and will not be repeated here.

[0093] See also Figure 1 Combined with Figure 2, the camera device 32 is arranged on the upper side of the second light irradiation unit 31 to collect detection images of the granular material 4 passing through the detection station. For example, the camera device 32 is arranged on the third light-transmitting surface 3102 on the top of the second shell 310. In one example, the camera device 32 is suspended on the upper side of the second light irradiation unit 31 through a column (not shown) arranged on the base. In the embodiment where the granular material is transparent or translucent, the camera device 32 is used to receive light that passes through the granular material and is reflected by the granular material to realize the collection of detection images of the granular material 4. In the embodiment where the granular material is non-transparent, the camera device 32 is used to receive light that is reflected by the granular material to realize the collection of detection images of the granular material 4.

[0094] The camera device 32 is used to capture a test image of the granular material 4 in an image acquisition environment that eliminates false targets, established by the multi-directional surface light and the alternating light and dark transmitted light, so as to highlight the image features of the true target of the granular material 4 in the test image. Furthermore, in one embodiment, to reduce the impact of false targets, the camera device 32 captures multiple (two or more) test images of the granular material to determine whether the same granular material in the multiple test images has defects. Specifically, the camera device captures multiple test images while the granular material 4 is in the image acquisition environment that eliminates false targets. The relative movement between the granular material and the alternating light and dark transmitted light can be used to obtain image features of different areas. Furthermore, through an algorithm, the number of false targets identified through the test images is greatly reduced, or even completely eliminated.

[0095] In one embodiment, the imaging device 32 includes a photosensor (e.g., a CCD or CMOS), which converts the light received by the imaging device 32 into a detection image. It should be noted that the number of imaging devices 32 can be one, two, or more. Using two or more imaging devices to capture detection images from different positions can improve detection accuracy and / or increase the processing capacity of pellets. In the following embodiments, the number of imaging devices 32 is one.

[0096] In one embodiment, to display the detection images captured by the camera 32 in real time, the automatic granular material detection equipment further includes a display device in communication with the camera for displaying the detection images. Examples of the display device include 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 disposed on the base. In another example, the display device can be configured as a separate auxiliary device independent of the automatic granular material detection equipment, allowing an operator to operate and view the detection images captured by the camera in real time.

[0097] In the detection image captured by the camera device 32, due to the effect of the light from the particles passing through the particles and the light reflected from the particle surface, the transparent particles show refracted grating stripe features. The image features of the particles showing 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 302 and the particles. For example, different feature changes appear on the same particles in the detection images at different times. In this process, even if the particles 4 are in the image acquisition environment for eliminating false targets, the detection images captured by the camera device still have residual features. Some pseudo targets that are shadows and / or black spots are pseudo targets derived from illumination. Therefore, when the light and dark stripes of the grating component 302 and the granular material move relative to each other and present dynamic changes in the image, 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, defects inherent in the granular material will not change significantly or disappear as the light and dark stripes of the grating component 302 and the granular material move relative to each other. Therefore, it is easy to distinguish and identify pseudo targets and true targets on the granular material through the algorithm.

[0098] In one embodiment, the second light irradiation unit is movably disposed above the inspection station so as to facilitate necessary cleaning and maintenance of the inspection station after being moved and opened.

[0099] In one embodiment, the automatic granular material inspection device further comprises a control device in communication with the camera device, wherein the control device acquires the inspection image captured by the camera device and uses the inspection image to detect the discolored defects and / or the discolored defects. Figure 8 , which is a schematic diagram showing the principle of a control device in one embodiment of the present application. As shown in the figure, the control device 7 includes an interface unit 70, a storage unit 71, and a processing unit 72 connected through a bus.

[0100] The bus may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, among others. Buses can be categorized as address buses, data buses, and control buses. For ease of illustration, the figure shows only one line, but this does not imply a single bus or type of bus. A bus may include a pathway for transmitting information between various components of a computing device (e.g., memory, processor, and communication interface).

[0101] The interface unit 70 is used to communicate with the camera device to obtain the detection image captured by the camera device. In some embodiments, the interface unit 70 includes at least one interface, each of which is used to output a visual interface, receive human-computer interaction events generated according to the staff's operation, etc. For example, the interface unit 70 includes but is not limited to: a serial interface such as an HDMI interface or a USB interface, or a parallel interface, etc. In one embodiment, the interface unit 70 also includes a network communication unit, which is a device for data transmission using a wired or wireless network, examples of which include but are not limited to: an integrated circuit including a network card, a local area network module such as a WiFi module or a Bluetooth module, a wide area network module such as a mobile network, etc.

[0102] Furthermore, in embodiments where the automatic granular material detection device includes a display device, the interface unit 70 is further configured to output control signals for displaying the detection image to the display device. Furthermore, the interface unit 70 may be communicatively connected to an input device of the automatic granular material detection device to obtain information input by a worker. The interface unit 70 utilizes a transceiver module, such as, but not limited to, a network interface card or transceiver, to facilitate communication between the computing device and other devices or a communication network.

[0103] In some embodiments, the storage unit 71 is used to store at least one program, and the at least one program can be executed by the processing unit 72 to coordinate the storage unit 71, the first transmission device, the second transmission device, the camera device, the jet assembly, etc. of the automatic pellet inspection equipment to realize the pellet transportation to the inspection station and perform defect detection of the pellet based on the acquired inspection image.

[0104] Here, the storage unit 71 includes, but is not limited to, read-only memory, random access memory, and non-volatile memory. For example, the storage unit 71 includes a flash memory device or other non-volatile solid-state storage device. In some embodiments, the storage unit 71 may also include a memory remote from one or more processing units 72. The memory may include volatile memory, such as random access memory (RAM). The processor may also include non-volatile memory, such as read-only memory (ROM), random access memory (RAM), flash memory, programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), hard disk drive (HDD), or solid state drive (SSD). The memory is used to store executable program code, and the processor executes the program after receiving an execution instruction.

[0105] In some embodiments, the processing unit 72 includes one or more processors. The processing unit 72 is operable to perform data read and write operations with the storage unit 71. The processing unit 72 includes one or more processors. The processor may include any one or more of a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor (MP), or a digital signal processor (DSP). For another example, an application-specific integrated circuit (ASIC), a discrete gate or transistor logic device, or a discrete hardware component may be used to control the automatic granular material inspection device to automatically detect defects in the granular material and collect the granular material.

[0106] In one embodiment, the automatic granular material detection device further includes an input device, such as a touch screen or a keyboard connected to the control device, etc. The input device is used to provide a human-computer interaction interface for input by a worker.

[0107] In one embodiment, the control device or staff in the automatic particle detection equipment will also adjust the height of the grating plate and / or the first dark light-transmitting plate in the up and down directions, as well as the brightness of the light source assembly, so that the image features of the false target in the detection image captured by the camera device are weakened or completely eliminated.

[0108] In one embodiment, see Figure 7, which is a schematic diagram of the principle of an automatic pellet inspection device in another embodiment of the present application, as shown in the figure, the automatic pellet inspection device further includes a collection mechanism 6 disposed at the discharge end of the second conveying device 2 for collecting the pellets 4 inspected by the inspection device 3. For example, the collection mechanism 6 is disposed adjacent to the discharge end to collect the inspected pellets.

[0109] In one embodiment, the collecting mechanism 6 includes at least two conveying channels 60 for receiving the discharge end, and a container 61 docking with each of the conveying channels 60. Figure 7 As shown, the collection mechanism 6 includes three transfer channels 60, which are used to transfer pellets with color defects, pellets with shape defects, and pellets without defects (e.g., pellets that meet good product / yield requirements) to corresponding containers 61 for classified collection. Container 61 is where the user collects the pellets. In other words, the user can collect the pellets in container 61.

[0110] In another embodiment, there is no need to classify and collect defective pellets. Instead, only one transmission channel and corresponding container are required for transporting the inspected pellets. In other embodiments, based on the inspiration of this application, three or more transmission channels can be provided to classify and collect different discolored and / or shaped defects. For example, large pellets, small pellets, snakeskin pellets, tailing pellets, flocculent particles, and particles with bubbles can be transported through different transmission channels. In the following embodiments, the collection mechanism 6 is described as including three transmission channels 60.

[0111] In a specific embodiment, if Figure 7 As shown, the collection mechanism 6 includes three transfer channels 60. The transfer channel 60 for collecting defect-free pellets is located along the pellets' free-fall trajectory to collect inspected pellets moving along the free-fall trajectory. The two transfer channels 60 for collecting pellets with discolored defects and pellets with irregularly shaped defects are located at different positions at the front end of the pellets' free-fall trajectory, respectively, to collect inspected pellets with discolored defects and pellets with irregularly shaped defects. In other embodiments, the two transfer channels for collecting pellets with discolored defects and pellets with irregularly shaped defects may also be located at different positions at the rear end of the pellets' free-fall trajectory.

[0112] To ensure that corresponding pellets can enter corresponding transfer channels 60, in one embodiment, the collection mechanism 6 further includes a sorting device 62 disposed within the collection mechanism 6 and electrically connected to a control device (not shown). The sorting device 62 is configured to sort the target pellets identified by the control device into corresponding transfer channels 60 within the collection mechanism 6. For example, if the control device identifies a target pellet with an irregular shape, the control device controls the sorting device 62 to sort the target pellet into the transfer channel 60 for pellets with irregular shapes. For another example, if the control device identifies a target pellet with a discolored defect, the control device controls the sorting device 62 to sort the target pellet into the transfer channel 60 for pellets with discolored defects. For another example, if the control device identifies a large pellet as the target pellet, the control device controls the sorting device 62 to sort the large pellet into the transfer channel 60 for pellets with large defects.

[0113] In one embodiment, the sorting device 62 includes an air jet assembly 620 for changing the moving direction (or falling direction) of the target pellets according to the sorting instruction. Figure 7 As shown, the sorting device 62 includes two jet assemblies 620. In one example, the jet assembly is composed of multiple jet nozzles designed according to precision requirements and arranged in a straight line across the width of the transparent conveyor belt. The position of each jet nozzle approximately corresponds to a coordinate position across the width of the conveyor belt. The sorting instructions are determined based on the position of the target pellets in the detection image detected by the automatic pellet detection equipment and the moving speed of the transparent conveyor belt. Specifically, the control device of the automatic pellet detection equipment determines the time when the target pellets, after leaving the discharge end, reach the corresponding jet position of the jet assembly based on the position of the target pellets in the detection image, the time when the detection image is captured, and the moving speed of the transparent conveyor belt. The control device determines the corresponding time as the jet time, and then controls the jet assembly to jet during the jet time to change the movement direction of the target pellets, so that the target pellets enter the corresponding transmission channel.

[0114] In one example, the jet assembly 620 includes an air compressor for providing high-pressure gas, a pipeline connected to the air compressor for transmitting the high-pressure gas, and a nozzle connected to the pipeline for injecting air / air. The number of the jet assemblies 620 is equal to the number of the transmission channels 60 for classifying and collecting defective pellets.

[0115] To prevent the airflow ejected by the jet assembly 620 from bouncing off the transmission channel and affecting subsequent pellet collection, an airflow absorption device 600 is further provided at the entrance of the transmission channel 60 for collecting defective particles. The airflow absorption device 600 is exemplified by a screen plate having through holes. In one example, the screen plate has through holes of a predetermined shape arranged in a regular pattern. To increase the service life of the screen plate, the screen plate is made of a wear-resistant material. For example, the screen plate is made of stainless steel, aluminum alloy, or plastic.

[0116] In another example, with Figure 7 The jet assembly and the transmission channel are arranged in different directions. The jet assembly and the transmission channel can be arranged in an interchangeable direction. Figure 7 As shown, the pellets are on the left side of the free fall, and the air jet assembly jets to the right, that is, the corresponding pellet conveying channel is arranged on the right side of the free fall of the pellets to receive the pellets screened by the air jet.

[0117] In one embodiment, if Figure 7 As shown, a weighing device 63 is further provided at the bottom of each container 61, and the weighing device 63 is used to detect the weight of the pellets in the container 61. Furthermore, when the control device determines that the weight of the pellets in the container 61 reaches a preset weight, the pellet automatic detection device is controlled to stop working.

[0118] It should be noted that, in other embodiments, the collection mechanism at the discharge end of the automatic particle detection device may not perform classified collection. In other words, the collection mechanism may only include a transmission channel and a container corresponding to the transmission channel. The collection mechanism may also not be provided at the discharge end of the automatic particle detection device, and the user may collect the detected particles at the discharge end through manual operation.

[0119] Although the automatic particle detection equipment in the embodiment of the present application can perform both color and shape detection on the particles at the same detection station, according to different needs of users, the automatic particle detection equipment can be used only for shape detection on the particles or only for color detection on the particles, and can also perform both color and shape detection on the particles at the same time. In this way, the automatic particle detection equipment of the present application can not only realize multi-functional detection in a centralized manner but also be configured according to different needs.

[0120] In summary, the automatic particle inspection equipment provided by the present application transports the received particles to the discharge end of the second transmission device after inspection through a transparent conveyor belt in a second output device which is arranged at the feeding port of the first transmission device, and the feeding speed of the transparent conveyor belt is greater than the feeding speed of the feeding port of the first transmission device, so that the particles passing through the inspection station meet the particle spacing requirements of both special-shaped and special-colored inspections. In this way, the influence of no spacing between particles on the detection accuracy of special-colored defects and special-shaped defects is avoided, especially the influence on the detection accuracy of special-shaped defects is avoided, so that the special-shaped defects of particles can be inspected at the same inspection station. There is no need to conduct separate inspections of color defects and irregular-shaped defects at the front and rear inspection stations, which reduces the size of the inspection equipment. The inspection device arranged at the inspection station establishes an image acquisition environment that eliminates false targets through multi-directional surface light and alternating light and dark transmitted light. The camera device of the inspection device can capture the inspection image of the granular material passing through the inspection station in the image acquisition environment that eliminates false targets to highlight the image features of the true targets of the granular material in the inspection image. The change of image features during the movement of the granular material can eliminate the interference of shadows and black spots derived from illumination on the detection of granular defects, thereby further improving the accuracy of detection. Furthermore, under the condition that the granules are in an image acquisition environment that eliminates false targets, by adjusting the height of the grating plate and / or the first dark translucent plate in the vertical direction, as well as the brightness of the light source assembly, and the distance between the reflector and the granules, the image features of the false targets are weakened or even eliminated, and the image features of the true targets are revealed. Under the premise of the technical effect, the characteristic changes of multiple detection images of the granules in motion captured by the camera device are used for detection and analysis, thereby reducing the interference of shadows and black spots on defect detection; the outline of the stripes in the grating assembly provided by the present application is different from the outline of the granules of transparent material, so that it can avoid the synchronous change of the image features of the transparent area on the granules due to the same stripe outline as the granule outline, and it is impossible to distinguish whether the position of the light change is above or outside the granules, thereby improving the accuracy of the detection of granules of transparent material.

[0121] To sum up, the automatic particle detection equipment provided by the present application transports the received particles to the discharge end of the second transmission device after detection through a transparent conveyor belt in the second output device which is arranged at the feeding port of the first transmission device, and the feeding speed of the transparent conveyor belt is greater than the feeding speed of the feeding port of the first transmission device, so that the particles passing through the detection station meet the particle spacing requirements of both special-shaped and special-colored detection. In this way, the influence of no spacing between the particles on the detection accuracy of special-colored defects and special-shaped defects is avoided, especially the influence on the detection accuracy of special-shaped defects is avoided, so that the special-colored defects and special-shaped defects of the particles can be detected at the same detection station without the need for separate detection at the front and rear detection stations, thereby reducing the size of the detection equipment and realizing the sorting and collection of special-colored and special-shaped defects at the same time.

[0122] In addition, the technical solution provided by the present application establishes an image acquisition environment for eliminating false targets through multi-directional surface light and alternating light and dark transmitted light by the detection device configured at the detection station, and then the camera device of the detection device can capture the detection image of the granular material passing through the detection station in the image acquisition environment for eliminating false targets to highlight the image features of the true target of the granular material in the detection image, thereby eliminating the interference of shadows and black spots derived from illumination on the detection of granular defects to further improve the accuracy of detection; and then, under the condition that the granular material is in the image acquisition environment for eliminating false targets, by adjusting the height of the grating plate and / or the first dark light-transmitting plate in the up and down directions, as well as the light source Under the premise of the technical effect of the brightness of the component and the spacing between the reflector and the granular material, the image features of the false target are weakened or even eliminated, and the image features of the true target are revealed, the detection analysis is performed using the detection image captured by the camera device, reducing the interference of shadows and black spots on defect detection; in addition, under the condition that the granular material is in the image acquisition environment for eliminating false targets, the camera device captures multiple detection images, and uses the relative movement between the granular material and the alternating light and dark transmitted light to make the shadows not exist at the same time in different detection images, and the black spots appear at different grayscales in different detection images, thereby greatly reducing the number of false targets identified by the detection image through the algorithm, or even completely eliminating them. The outline of the stripes in the grating component provided by the present application is different from the outline of the transparent material granular material, so that it can avoid the inability to distinguish whether the light change position is on the granular material or outside the granular material due to the same stripe outline as the granular material, thereby improving the accuracy of transparent material granular material detection.

[0123] The above embodiments are merely illustrative of the invention and the beneficial effects achieved by this application and are not intended to limit this application. Anyone familiar with the art may modify or alter the above embodiments without departing from the principles and scope of this application. Therefore, all equivalent modifications or alterations accomplished by a person of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. An automatic pellet detection device, characterized in that: include: A first conveying device is used to convey the received pellets to its feeding port in a pellet-by-pellet manner; a second conveying device, disposed at the feed port of the first conveying device, comprising a transparent conveyor belt for receiving pellets from the feed port, the transparent conveyor belt being used to convey the received pellets to a discharge end of the second conveying device after inspection; wherein the feeding speed of the transparent conveyor belt is greater than the feeding speed of the feed port of the first conveying device, so that the pellets passing through the inspection station meet the inspection particle spacing requirements; A detection device, configured corresponding to the second transmission device, is used to detect the granular materials passing through the detection station; it includes a first light source irradiation unit configured at the lower side of the detection station for providing alternating light and dark transmitted light, a second light irradiation unit configured at the upper side of the detection station for providing multi-directional surface light, and a camera device configured at the upper side of the second light irradiation unit for capturing detection images of the granular materials passing through the detection station, wherein the camera device is used to capture the detection images of the granular materials in an image capture environment established by the multi-directional surface light and the alternating light and dark transmitted light to eliminate false targets, so as to highlight the image features of the true targets of the granular materials in the detection images.

2. The automatic granular material detection equipment according to claim 1, characterized in that: The first transmission device includes a feed trough and a driving device for driving the feed trough to vibrate, wherein the driving device is used to drive the feed trough to vibrate by direct vibration to transmit the pellets to the feeding port in a pellet-by-pellet manner.

3. The automatic granular material detection equipment according to claim 2, characterized in that: The feeding trough is provided with a dust removal section for dust removal adjacent to the feeding port, and the dust removal section is also used as a damping section for differentiating the moving speed of the pellets.

4. The automatic granular material detection equipment according to claim 3, characterized in that: The dust removal section is a mesh structure, which facilitates the discharge of granular ash layers or fine particles through the mesh structure.

5. The automatic granular material detection equipment according to claim 1, characterized in that: The automatic granular material detection equipment further includes a material discharge device located at an input end of the first transmission device, for delivering the granular material to the first transmission device.

6. The automatic granular material detection equipment according to claim 5, characterized in that: The unloading device includes a hopper for receiving the granular material, a unloading pipe connected to the hopper, and a height adjustment device mounted on the unloading pipe for adjusting the distance between the unloading port of the unloading pipe and the first transmission device, wherein the height adjustment device adjusts the unloading speed of the unloading port by adjusting the distance.

7. The automatic granular material detection equipment according to claim 6, characterized in that: The feeding device further comprises a dust removal pipeline connected to the feeding pipe for removing dust.

8. The automatic granular material detection equipment according to claim 1, characterized in that: The first light source irradiation unit includes: The housing comprises a light-transmitting surface and a receiving space located below the light-transmitting surface; a light source assembly, disposed in the accommodating space, for providing light of a first intensity and light of a second intensity, wherein a distribution area of ​​the light of the first intensity corresponds to the light-transmitting surface and an intensity of the light of the first intensity is less than an intensity of the light of the second intensity; The grating component is arranged in the accommodating space in parallel with the light-transmitting surface and is located between the light source component and the light-transmitting surface. It is provided with light and dark stripes for dividing the light provided by the light source component to provide the alternating light and dark transmitted light.

9. The automatic granular material detection equipment according to claim 8, characterized in that: The light source assembly includes a planar light source for emitting light of second intensity and a dark light-transmitting plate located between the planar light source and the grating assembly for reducing the second intensity of the light to provide light of first intensity.

10. The automatic granular material detection equipment according to claim 8, characterized in that: The grating assembly includes a grating plate with light and dark stripes, wherein the granular material driven by the transparent conveyor belt moves relative to the grating plate.

11. The automatic granular material detection equipment according to claim 1, characterized in that: The second light irradiation unit includes: The housing comprises a light-transmitting surface and a receiving space located above the light-transmitting surface; a light source, located in the accommodation space, for emitting light to be reflected by the inner surface of the housing; A light-transmitting cover is arranged on the upper side of the light-transmitting surface and is used to transmit the light reflected by the inner surface of the shell to provide the multi-directional surface light to irradiate the surface of the granular material.

12. The automatic granular material detection equipment according to claim 11, characterized in that: The light-transmitting cover includes a lampshade bracket and a light diffusion plate arranged on the lampshade bracket. The lampshade bracket is arranged on the upper side of the light-transmitting surface. The light diffusion plate is used to transmit the light reflected by the inner surface of the shell to provide the multi-directional surface light to irradiate the surface of the granular material.

13. The automatic granular material detection device according to claim 11, characterized in that: The second light irradiation unit further includes a dark light-transmitting plate disposed in the accommodating space and used for reducing the intensity of the multi-directional surface light.

14. The automatic granular material detection equipment according to claim 1, characterized in that: The second light irradiation unit includes: The housing comprises a light-transmitting surface and a receiving space located above the light-transmitting surface; A reflector is provided on the upper side of the light-transmitting surface and is used for reflecting the alternating light and dark transmitted light to form multi-directional surface light.

15. The automatic granular material detection equipment according to claim 1, characterized in that: The automatic pellet inspection device is used to perform shape detection and / or color detection on the pellets.

16. The automatic granular material detection device according to claim 15, characterized in that: The true target is a discolored defect and / or a discolored defect in the granular material; the false target includes at least one of the following: a shadow produced by light irradiating the granular material, a shadow produced on the edge of the granular material due to the mutual influence between the granular materials, and a black spot produced by local insufficient illumination caused by refraction and / or reflection of light on granular materials of transparent material.

17. The automatic granular material detection equipment according to claim 1, characterized in that: It also includes a collecting mechanism configured at the discharge end of the second transmission device for collecting the pellets detected by the detection device.

18. The automatic granular material detection device according to claim 17, characterized in that: The collecting mechanism includes at least one conveying channel for receiving the discharge end, and a container for collecting granular materials connected to each of the conveying channels.

19. The automatic granular material detection device according to claim 18, characterized in that: It also includes a sorting device configured in the collecting mechanism and electrically connected to the control device, for sorting the target particles determined by the control device to the corresponding conveying channel in the collecting mechanism.

20. The automatic granular material detection device according to claim 19, characterized in that: The sorting device includes an air jet assembly for changing the moving direction of target granular materials according to a sorting instruction.

Images