Appearance detection device

Abstract

The embodiment of the invention provides an appearance detection device which comprises a rack, a shooting mechanism and a lighting mechanism, and the rack comprises lower platforms arranged on the two sides of a conveying track, an upper platform arranged above the lower platforms and a plurality of supporting parts; the supporting component is connected with at least one of the upper platform and the lower platform; the shooting mechanism comprises a first camera used for shooting a first side surface of the to-be-detected material, a plurality of second cameras used for shooting a second side surface of the to-be-detected material, and a third camera used for shooting a third side surface of the to-be-detected material; the plurality of second cameras are connected with a liftable first supporting component through a first mounting frame; the first supporting part penetrates through the lower platform and is connected with the lifting driving mechanism; the lighting mechanism comprises a top lamp used for irradiating the first side face, a plurality of side lamps used for irradiating the second side face and a bottom lamp used for irradiating the third side face. The top lamp is connected with the upper platform, the side lamps are connected with the first installation frame so that the side lamps and the corresponding second cameras can move synchronously, and the bottom lamp is connected with the lower platform. According to the technical scheme, the shooting height of the shooting mechanism is automatically adjusted, and the adaptability and universality of the external inspection equipment are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of chemical fiber production, and particularly to an appearance detection device. Background Art

[0002] In the field of chemical fiber production, strict appearance detection of different types of chemical fiber cakes or spindles such as POY (Pre-Oriented Yarn), DTY (Draw Textured Yarn), and FDY (Fully Drawn Yarn) is an important link to ensure product quality and timely detect and remove defective products. Appearance detection equipment usually mounts industrial cameras and, through image acquisition and analysis technologies, inspects the forming, color, surface defects, etc. of the cakes. These different types of silk products have differences in size, winding density, and surface characteristics due to their different processing technologies and uses.

[0003] Existing appearance detection equipment usually integrates multiple industrial cameras and supporting light sources, and takes pictures of products from different angles to obtain comprehensive appearance information. These cameras and light sources are often independently positioned and fixed according to products of specific specifications during installation, and their positions and angles usually do not have the ability to be adjusted during the operation of the equipment. Summary of the Invention

[0004] Embodiments of the present disclosure provide an appearance detection device to solve or alleviate one or more technical problems in the prior art.

[0005] As an aspect of the embodiments of the present disclosure, embodiments of the present disclosure provide an appearance detection device, including:

[0006] A frame, including a lower platform disposed on both sides of a conveyor track, an upper platform disposed above the lower platform, and a plurality of equipment support components; the equipment support components are connected to at least one of the upper platform and the lower platform;

[0007] A shooting mechanism, including a first camera for shooting a first side of the material to be detected, a plurality of second cameras for shooting a second side of the material to be detected, and a third camera for shooting a third side of the material to be detected; the plurality of second cameras are connected to a liftable first support component through a first mounting frame; the first support component passes through the lower platform and is connected to a lift driving mechanism;

[0008] Wherein, the second side is a circumferential surface, and the plurality of second cameras are arranged at intervals around the circumferential surface; the plurality of second cameras are at the same shooting height, and the shooting height is determined according to the type or size of the material to be detected;

[0009] The lighting mechanism includes a ceiling lamp for irradiating the first side surface, a plurality of side lamps for irradiating the second side surface, and a bottom lamp for irradiating the third side surface; the ceiling lamp is connected to the upper platform, the plurality of side lamps are connected to the first mounting bracket, so that the side lamps move synchronously with the corresponding second cameras, and the bottom lamp is connected to the lower platform.

[0010] In one implementation, the plurality of second cameras include edge cameras disposed in the side regions of the lower platform, and two such edge cameras are provided on each side of the lower platform; the edge cameras are arranged facing the detection station on the conveyor track, and the distances from the detection station to the plurality of second cameras are the same.

[0011] In one implementation, the plurality of second cameras include a middle camera, and at least one middle camera is provided on each side of the lower platform, and the middle camera is arranged facing the detection station on the conveyor track; the angles formed between every two adjacent second cameras in the plurality of second cameras and the detection station are the same.

[0012] In one implementation, the first support member includes a first vertical rod, the first vertical rod passes through the lower platform through a bushing and is connected to the lifting drive mechanism disposed below the lower platform; the top of the first vertical rod corresponding to the edge camera is slidably connected to the upper platform.

[0013] In one implementation, the first support member for mounting the edge camera further includes a first cross bar, the first cross bar is connected to the first vertical rod through a connecting member, the first end of the first cross bar is closer to the conveyor track, and the first end is connected to the first mounting bracket.

[0014] In one implementation, the first mounting bracket includes a bottom plate and side plates provided on both sides of the bottom plate, and the second camera is disposed on the bottom plate; both sides of the second camera are respectively connected to a side lamp through the side plates.

[0015] In one implementation, there is a first angle of 1° to 30° between the outer surfaces of the two side plates of each group of first mounting brackets, and there is a second angle between a pair of side lamps connected to the side plates, and the second angle is complementary to the first angle.

[0016] In one implementation, the ceiling lamp is an annular lamp, and the first camera captures the material to be detected below through the hollow part of the annular lamp.

[0017] In one implementation, the bottom lamp includes a pair of arc lamps respectively provided on the two lower platforms.

[0018] In one implementation, the arc-shaped lamp is connected to the slide rail of the lower platform through a connecting component, and the extending direction of the slide rail is perpendicular to the material conveying direction; the end of the arc-shaped lamp extends above the conveying track; wherein, the distance between the ends of the pair of arc-shaped lamps is greater than the diameter of the corresponding part of the tray for carrying the material to be detected.

[0019] In one implementation, the third camera is connected to the second supporting component through the second mounting bracket; the second supporting component includes a second cross bar and a second vertical bar, the second vertical bar passes through the lower platform through a bushing and is connected to a lifting drive mechanism arranged under the lower platform; the third camera rotates around the vertical bar as the center.

[0020] In one implementation, the conveying track includes a conveying roller for carrying and conveying the material to be detected and a guide rail connected to the end of the conveying roller; there is a gap between the lower platform and the guide rail.

[0021] The embodiments of the present disclosure adopt the above technical solutions, which can automatically adjust the shooting height of the shooting mechanism according to the change of the material to be detected, so that one detection device can be compatible with the detection requirements of multiple products, improving the adaptability and versatility of the external inspection device, reducing the trouble of replacing or adjusting the whole set of equipment due to product switching, and improving the production efficiency.

[0022] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present disclosure will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments provided by the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0024] Figure 1 is a schematic structural view of an appearance detection device according to an embodiment of the present disclosure;

[0025] Figure 2 is a top view schematic diagram of an appearance detection device according to an embodiment of the present disclosure;

[0026] Figure 3 is a schematic structural view of a part of the first mounting bracket according to an embodiment of the present disclosure.

[0027] Description of reference numerals: 100, frame; 110, lower platform; 111, bushing; 120, upper platform; 130, equipment support member; 131, first support member; 131a, first vertical rod; 131b, first horizontal rod; 131c, connecting member; 132, second support member; 132a, second horizontal rod; 132b, second vertical rod; 200, conveying track; 201, conveying roller; 202, guide rail; 210, detection station; 300, photographing mechanism; 310, first camera; 320, second camera; 320a, side camera; 320b, middle camera; 321, first mounting bracket; 321a, bottom plate; 321b, side plate; 330, third camera; 331, second mounting bracket; 400, lighting mechanism; 410, top light; 420, side light; 430, bottom light; 432, connecting member; 433, slide rail. Detailed implementation manners

[0028] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and the description are regarded as exemplary rather than restrictive in nature.

[0029] In the description of the present application, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0030] In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0031] In the solution of the embodiments of the present disclosure, the main types of filaments involved may include one or more of partially oriented yarns (POY), fully drawn yarns (FDY), draw textured yarns (DTY) (or called low elastic yarns), etc. For example, the types of filaments may specifically include polyester partially oriented yarns, polyester fully drawn yarns, polyester drawn yarns, polyester draw textured yarns, etc.

[0032] This embodiment provides an appearance detection device, which can be used for appearance detection of filament cakes or ingots (hereinafter collectively referred to as "materials to be detected") such as POY, DTY, FDY, etc. in chemical fiber production.

[0033] Figure 1 The structural schematic diagram of the appearance detection device according to the embodiments of the present disclosure is shown. Figure 2 The top view schematic diagram of the appearance detection device according to the embodiments of the present disclosure is shown. Combining Figure 1 and Figure 2 As shown, the appearance detection device includes a frame 100, a photographing mechanism 300, and an illumination mechanism 400.

[0034] The frame 100 includes a lower platform 110 disposed on both sides of the conveying track 200, an upper platform 120 disposed above the lower platform 110, and a plurality of equipment support members 130. The equipment support members 130 are used to support the photographing mechanism 300 and the illumination mechanism 400, and are connected to at least one of the upper platform 120 and the lower platform 110 to ensure the stability and rigidity of the equipment. The conveying track 200 is used to convey the materials to be detected.

[0035] The photographing mechanism 300 is used to photograph the materials to be detected from multiple angles. The photographing mechanism 300 includes:

[0036] A first camera 310, which is used to photograph the first side of the material to be detected (for example, the top surface of the filament cake).

[0037] Multiple second cameras 320 are used to photograph the second side of the material to be detected (for example, the circumferential surface of the cake). The multiple second cameras 320 are connected to the liftable first support member 131 through the first mounting bracket 321. The first support member 131 passes through the lower platform 110 and is connected to a lift drive mechanism (such as an electric cylinder, a servo motor cooperating with a lead screw, etc.) provided below the lower platform 110. By driving the first support member 131 to lift and lower through the lift drive mechanism, the first mounting bracket 321 and the multiple second cameras 320 mounted thereon are driven to lift and lower synchronously. The second side is a circumferential surface, and the multiple second cameras 320 are arranged around the circumferential surface of the material to be detected at intervals in the circumferential direction to achieve a complete photograph of the circumferential surface. The multiple second cameras 320 are at the same photographing height, and this photographing height can be determined and adjusted according to the type of the material to be detected (such as POY, DTY or FDY) or the specific dimensions (such as diameter, height).

[0038] A third camera 330 is used to photograph the third side of the material to be detected (for example, the bottom end surface of the cake).

[0039] The lighting mechanism 400 provides lighting for the photographing mechanism 300. The lighting mechanism 400 includes:

[0040] A top lamp 410 is used to irradiate the first side of the material to be detected, and the top lamp 410 is connected to the upper platform 120.

[0041] Multiple side lamps 420 are used to irradiate the second side of the material to be detected. Crucially, the multiple side lamps 420 are connected to the first mounting bracket 321. Such a design enables the side lamps 420 to move synchronously with the corresponding second cameras 320 when the first mounting bracket 321 lifts and lowers with the first support member 131, ensuring that regardless of how the photographing height changes, the second cameras 320 can always obtain a stable and appropriate lighting effect from the side lamps 420.

[0042] A bottom lamp 430 is used to irradiate the third side of the material to be detected, and the bottom lamp 430 is connected to the lower platform 110.

[0043] According to the solution of the embodiment of the present disclosure, by arranging a plurality of second cameras 320 for photographing the circumferential surface of the material to be detected and a plurality of side lights 420 cooperating therewith on the liftable first support member 131 and driving by a lift driving mechanism, automatic adjustment of the photographing height is achieved. This means that when it is necessary to detect bobbins of different types (such as POY, DTY, FDY) or different sizes, the heights of the second cameras 320 and the side lights 420 can be conveniently adjusted to adapt to the changes in the material. Thus, one device can be compatible with the detection requirements of multiple products, improving the adaptability and versatility of the external inspection device, reducing the trouble of replacing or adjusting the entire set of equipment due to product switching, and improving production efficiency. At the same time, the side lights and the second cameras are lifted and lowered synchronously to maintain the consistency of the relative position and angle between the two, which can avoid light problems caused by position changes between the two, such as the second camera being directly irradiated by the side light on the opposite side.

[0044] It should be noted that, in terms of the overall structure of the appearance detection device, the entire device is preferably completely arranged inside a chassis. The chassis provides necessary protection for the internal detection mechanism, photographing mechanism, lighting mechanism, control system, etc., and helps to form a relatively enclosed and controlled detection environment. The upper platform 120 and the lower platform 110 in the device are fixedly connected to the inner wall or the internal frame structure of the chassis to ensure the stability and rigidity of the overall structure. In order to realize the continuous passing and automatic detection of the material to be detected, the chassis is provided with notches at both the inlet and outlet of the material conveying path. The shapes and sizes of these notches are designed to be roughly matched with the outer contour of the material to be detected (such as bobbins or ingots of POY, DTY, FDY, etc.). This matching notch design, on the one hand, ensures that the material to be detected can smoothly enter and leave the detection area, and on the other hand, helps to minimize the interference of external light entering the chassis on the lighting environment, and can also prevent external dust and other pollutants from entering to a certain extent, thus ensuring the accuracy of the detection results and the long-term stable operation of the device. In addition, the appearance detection device can be installed on the side of the existing conveying track, that is, the conveying track 200 can be a part of the existing production line.

[0045] In a possible implementation manner, the plurality of second cameras 320 include edge cameras 320a arranged in the side regions of the lower platform 110. In a preferred arrangement, two of the edge cameras 320a are provided on each side of the lower platform 110 (i.e., on each side of the conveying track 200). The edge cameras 320a are arranged towards the detection station 210 on the conveying track 200 (the conveying track is a part of the production line conveying mechanism). The detection station is a predetermined position where the material to be detected is detected on the conveying track 200. Importantly, the shooting distances from the detection station to the plurality of second cameras 320 (including the edge cameras 320a) are designed to be the same to ensure the consistency of imaging.

[0046] According to the solution of the embodiment of the present disclosure, by symmetrically arranging side cameras 320a on both sides of the detection station and ensuring that the distances from each second camera 320 to the detection station are the same, the image information of the circumferential surface of the material to be detected can be captured more comprehensively and evenly. This symmetric and equidistant arrangement helps to eliminate image distortion or information omission that may be caused by inconsistent shooting angles or distances, especially for detecting defects (such as lint, oil stains, etc.) on the circumferential surface, with higher coverage and accuracy, improving the detection quality of the circumferential surface of the material.

[0047] In a possible implementation manner, the plurality of second cameras 320 further include middle cameras 320b in addition to the side cameras 320a. At least one middle camera 320b is provided on each lower platform 110 on each side (i.e., on each side of the conveying track 200), and the middle camera 320b is also arranged facing the detection station 210 on the conveying track. Further, the angle formed by the center of the detection station 210 and each two adjacent second cameras 320 among the plurality of second cameras 320 (including side cameras 320a and middle cameras 320b) is the same. This means that the plurality of second cameras 320 (including side cameras and middle cameras) are distributed in a uniform annular array centered on the detection station 210. For example, on both sides of the conveying track 200, two side cameras 320a and one middle camera 320b are respectively installed, and the six second cameras are spaced 60° from each other centered on the detection station 210. It should be noted that Figure 1 only 3 second cameras on one side of the conveying track 200 are shown, and the 3 second cameras on the other side are not shown. Figure 2 3 second cameras on the other side are shown.

[0048] According to the solution of the embodiment of the present disclosure, all second cameras 320 (side and middle) are arranged at equal angular intervals around the detection station 210, and the information acquisition of the circumferential surface of the material to be detected is more uniform and complete. Shooting from multiple optimized angles reduces the shooting blind area, enabling any position on the circumferential surface to be effectively imaged. This is crucial for identifying and locating subtle defects that are only easily detectable at specific angles, thereby further improving the comprehensiveness and accuracy of the detection and ensuring the product quality.

[0049] In a possible implementation, the first support member 131 includes at least one first vertical rod 131a. The first vertical rod 131a passes through the lower platform 110 through a bushing 111 (provided on the lower platform 110) and is connected to the lifting drive mechanism provided below the lower platform 110. For the middle-position camera 320b, the corresponding first mounting bracket is directly provided at the top of the first vertical rod 131a. That is to say, the first vertical rod 131a directly supports at the bottom of the middle-position camera 320b and the first mounting bracket, with better stability. Even during the lifting movement, the middle-position camera 320b will not produce large fluctuations. For the side-position camera 320a, since the conveying track 200 has a certain width, the side-position camera 320a needs to extend towards the conveying track 200 through a cross bar, so that there is a certain distance between the side-position camera 320a and the corresponding first vertical rod 131a. To increase the stability during the lifting process, the top of the first vertical rod 131a corresponding to the side-position camera 320a is preferably slidably connected to the upper platform 120, for example, by a slider cooperating with a guide rail on the upper platform 120.

[0050] According to the solution of the embodiment of the present disclosure, the first vertical rod 131a passes through the bushing 111 and is connected to the lifting drive mechanism, providing a stable and reliable vertical lifting guide for the side-position camera 320a. At the same time, its sliding connection with the upper platform 120 constitutes a stable support similar to a gantry structure, significantly enhancing the stiffness and anti-vibration ability of the first support member 131 during the lifting process. This ensures that even after adjusting the shooting height, the side-position camera 320a can still maintain accurate focusing and a stable imaging posture, avoiding image blurring or detection errors caused by vibration or skew, which is of great significance for ensuring the consistency and reliability of the detection results of products in different batches and of different specifications.

[0051] In a possible implementation, the first support member 131 for mounting the side-position camera 320a, in addition to including the first vertical rod 131a, further includes a first cross bar 131b. The first cross bar 131b is connected to the first vertical rod 131a through a connecting member 131c (such as an L-shaped connecting plate or welding). The first end of the first cross bar 131b is designed to be closer to the conveying track, and the first mounting bracket 321 (for fixing the side-position camera 320a) is connected to this first end of the first cross bar 131b.

[0052] According to the solution of the embodiment of the present disclosure, by adding a first cross bar 131b and connecting it to the first vertical bar 131a, the position of the side camera 320a in the horizontal direction relative to the first vertical bar 131a can be adjusted more flexibly. In particular, by extending its first end towards the conveying track, the side camera 320a can be more accurately positioned at an ideal shooting point, such as closer to the edge of the material to be detected or avoiding interference from other structures. This structure optimizes the camera layout, helps to obtain the best shooting perspective and working distance, thereby improving the detection ability of defects in a specific area (such as the edge of the cake).

[0053] In a possible implementation, as Figure 3 shown, the first mounting bracket 321 includes a bottom plate 321a and two side plates 321b symmetrically arranged on both sides of the bottom plate 321a. The second camera 320 (whether it is the side camera 320a or the middle camera 320b) is fixedly mounted on the bottom plate 321a. The two side lights 420 cooperating with the second camera 320 are respectively connected to the bottom plate 321a through the side plates 321b

[0054] According to the solution of the embodiment of the present disclosure, the integrated design of mounting the second camera 320 on the bottom plate 321a and mounting the side lights 420 on the side plates 321b makes each second camera 320 and its corresponding lighting unit (side lights 420) form a compact module. Since the side lights 420 are fixed on the first mounting bracket 321 integrated with the camera, when the first mounting bracket 321 is lifted and lowered by the first support member 131 to adjust the height, the relative position between the camera and the light source remains unchanged. This ensures that regardless of how the shooting height is adjusted, the irradiation angle of the light source and its cooperation with the camera can be maintained in the best state, thereby ensuring stable lighting conditions and high-quality image acquisition, which is very beneficial for identifying subtle defects sensitive to lighting conditions.

[0055] In a preferred design, there is a preset first included angle between the outer surfaces (or their symmetric centerlines) of the two side plates 321b of each group of first mounting brackets 321, and the range of this first included angle is usually 1° to 30°. Correspondingly, a second included angle is also formed between a pair of side lights 420 (i.e., the two side lights surrounding the second camera 320) connected to the pair of side plates 321b. The design of the second included angle and the first included angle cooperate with each other. For example, the first included angle and the second included angle are complementary, and the sum of the two is 180°. If the side plates 321b are inclined inward, the optical axes of the side lights 420 are also adjusted accordingly to achieve the best lighting, and the complementarity can also be understood as synergistically optimizing the lighting effect. For example, the optical axes of the side lights can be designed to converge slightly towards the central area of the camera's field of view.

[0056] According to the solution of the embodiment of the present disclosure, by setting a specific first angle for the side plate 321b and making the second angle between the side lights 420 cooperate with it, the illumination angle and range of the side lights 420 for the detection area can be finely adjusted. Such a small angle adjustment, especially for the circumferential surface of the material to be detected with a certain curvature, can effectively converge light, reduce reflection or produce a specific shadow effect, enhance the contrast and visibility of defects, and improve the detection sensitivity and accuracy of the second camera 320. For example, a smaller angle can make the light more concentrated, suitable for detecting small defects; while a slightly larger angle can provide more uniform coverage.

[0057] In one implementation, at the connection between the bottom plate 321a and the side plate 321b of the first mounting bracket 321, or an angle adjustment mechanism is provided for the side plate 321b itself. The angle adjustment mechanism can be configured to allow one or both side plates 321b to deflect within a small range relative to the bottom plate 321a (or relative to the central axis of the second camera 320). This means that the above-mentioned first angle (i.e., the angle between the outer surfaces of the two side plates 321b) is no longer fixed, but can be automatically adjusted within a certain range (e.g., 0° to 45°).

[0058] The angle adjustment mechanism can take various forms, for example:

[0059] Electric adjustment: Drive the worm and gear mechanism or the small connecting rod mechanism through a micro servo motor or a stepper motor to precisely control the deflection angle of the side plate 321b. The control system can automatically command the motor to drive the side plate 321b to the optimal angle according to the type of the material to be detected, the surface characteristics (such as reflectivity) or the preset detection program.

[0060] Pneumatic adjustment: Push the side plate 321b through a micro cylinder to achieve switching between several preset angles.

[0061] When the angle of the side plate 321b changes, the irradiation direction and irradiation angle of the side lights 420 fixed on it also change accordingly. Therefore, the second angle between the side lights 420 will also change correspondingly, so as to realize the dynamic optimization of the illumination conditions of the second side (circumferential surface).

[0062] In this embodiment, by introducing an angle automatic adjustment mechanism for the side plate 321b (and the side lamp 420), the appearance detection device is given higher lighting flexibility and adaptability. For the materials to be detected with different types, glossiness, and texture features (such as highly reflective FDY filaments and relatively diffusely reflective DTY filaments), the system can automatically adjust the irradiation angle of the side lamp 420 to achieve the best defect manifestation effect. For example, for materials prone to specular reflection, the side lamp angle can be adjusted to avoid strong reflection areas, or specific grazing light can be used to highlight minute surface irregularities. This dynamic and intelligent lighting adjustment ability can significantly improve the detection rate of complex surface defects, reduce the limitations caused by fixed lighting angles, and further enhance the versatility and detection accuracy of the device.

[0063] In a possible implementation, the top lamp 410 is preferably an annular lamp. The first camera 310 is disposed in the central hollow part of the annular lamp and shoots downward through this hollow part to capture the first side (top end face) of the material to be detected.

[0064] According to the solution of the embodiment of the present disclosure, using an annular lamp as the top lamp and allowing the first camera 310 to pass through its center for shooting realizes coaxial illumination or approximate coaxial illumination. This illumination method can provide a very uniform and shadowless illumination effect for the top end face of the material to be detected, especially suitable for detecting flat or surfaces with complex textures. It can effectively eliminate the shadow interference that may be caused by lateral light sources, clearly show the forming state, label information, surface dirt, color difference and other defects of the top end face, and improve the accuracy and reliability of the detection of the first side.

[0065] In a possible implementation, the bottom lamp 430 includes a pair of arc lamps respectively disposed on the two lower platforms 110.

[0066] According to the solution of the embodiment of the present disclosure, designing the bottom lamp 430 as a pair of arc lamps and respectively arranging them on the lower platforms 110 on both sides of the conveying track can form an enclosing and wider-angle illumination for the third side (bottom end face) of the material to be detected from below. Compared with a single point light source or a linear light source, the arc lamp can better adapt to the bottom contour of cylindrical or quasi-cylindrical materials such as silk cakes, provide more uniform illuminance, and reduce the dark areas caused by the occlusion of the material itself or the tray carrying the material. This helps to clearly capture and detect the defects of the bottom end face, such as bottom tube damage, oil stains, and poor forming.

[0067] In a possible implementation, the arc lamp is connected to a slide rail 433 provided on the lower platform 110 through a connecting member 432. The extending direction of the slide rail 433 is designed to be perpendicular to the material conveying direction (i.e., perpendicular to the extending direction of the conveying track 200). The end of the arc lamp is designed to slightly intrude into the space above the conveying track 200. In addition, if the material to be detected is carried by a tray, the distance between the ends of the pair of arc lamps is designed to be greater than the diameter or width of the corresponding part of the tray.

[0068] According to the solution of the embodiment of the present disclosure, the arc lamp is installed on the slide rail 433 through the connecting member 432, so that its position can be adjusted along the direction of the slide rail 433 (i.e., perpendicular to the material conveying direction). This adjustability allows optimizing the illumination position of the arc lamp according to the width or size of the material or tray to be detected, ensuring the best bottom illumination effect. Its end extends into the space above the conveying track, enabling it to be closer to the bottom of the material to be detected and providing more direct illumination. At the same time, ensuring that the distance between the lamp ends is greater than the tray diameter avoids collision interference between the arc lamp and the tray and ensures that the light can effectively irradiate the bottom surface of the material on the tray, enhancing the adaptability and practicality of the bottom illumination.

[0069] In a possible implementation, the third camera 330 is connected to a second support member 132 through a second mounting bracket 331. The second support member 132 includes a second cross bar 132a and a second vertical bar 132b. The second vertical bar 132b passes through the lower platform 110 through a bushing 112 (provided on the lower platform 110) and is connected to a lifting drive mechanism provided below the lower platform 110 (this lifting drive mechanism can be independent, or can be linked or share some components with the mechanism driving the first support member). Further, the third camera 330 (or the second mounting bracket 331 connected thereto) is designed to be able to rotate about the axis of the second vertical bar 132b, for example, by providing a rotating mechanism.

[0070] According to the solution of the embodiment of the present disclosure, the third camera 330 is equipped with an independent second support member 132 with lifting and rotating functions, greatly improving its detection flexibility. The lifting function allows precisely adjusting the vertical position of the third camera 330 according to the height of the material to be detected to obtain a clear bottom image. The rotating function allows the third camera 330 to adjust the shooting angle in the horizontal plane, enabling key scanning of a specific area at the bottom or adapting to the bottom characteristics of materials with different shapes. This multi-degree-of-freedom adjustment ability ensures comprehensive and non-blind detection of the third side (bottom end face) of the material, enhancing the adaptability of the device to complex detection tasks.

[0071] In a possible implementation, the transfer track 200 includes a plurality of transfer rollers 201 for carrying and transferring the material to be detected, and a guide rail 202 connected to the ends of the transfer rollers 201 (or serving as their support and guide). Crucially, an appropriate gap is designed between the lower platform 110 and the guide rail 202.

[0072] According to the solution of the embodiment of the present disclosure, the transfer track 200 adopts the structure of transfer rollers 201 and a guide rail 202, providing stable and reliable transportation for the material to be detected. Setting a gap between the lower platform 110 and the guide rail 202 is an important vibration damping and isolation measure. This gap can effectively prevent the vibration generated during the operation of the transfer track 200 from being directly transmitted to the lower platform 110 and the high-precision imaging mechanism 300 and lighting mechanism 400 installed thereon. By reducing such mechanical vibration interference, the stability of the camera at the moment of shooting is ensured, thereby obtaining clearer and jitter-free images, which is crucial for accurately identifying minute defects and improving the stability of the overall detection system and the reliability of the detection results.

[0073] In a possible implementation, each of the plurality of side lights 420 adopts a rectangular array lamp board composed of a plurality of independently controllable LED lamp beads. These LED lamp beads are regularly arranged on the rectangular lamp board (for example, M rows and N columns). The rectangular array lamp board is equipped with a lamp bead control module, which can independently or group-control the turning on, turning off, and brightness of any one or a part of the LED lamp beads on the rectangular lamp board.

[0074] In this way, this embodiment can adaptively illuminate the area according to the height of the material to be detected: before the detection starts or during the detection process, the system can obtain the height information of the material to be detected (for example, through the lifting position sensor of the first support component, or through preset product parameters). The lamp bead control module, based on this height information, only lights up the LED lamp beads in those rows (or areas) on the rectangular array lamp board corresponding to the actual height of the material. For example, if the material is shorter, only the lower few rows of lamp beads on the lamp board are lit; if the material is taller, more rows or even all the lamp beads are lit. It can ensure that the second camera will not be directly irradiated by the side lights on the opposite side, affecting the imaging effect of the material to be detected.

[0075] On the other hand, this example can eliminate false judgments due to reflection through multiple exposures and zonal illumination: To distinguish real surface defects from bright or dark spots caused by surface reflection (especially for smooth or oily surfaces), which may be misjudged as defects, the lamp bead control module can control the LED lamp beads on the rectangular array lamp board to be lit in different areas and successively in a very short time, and cooperate with the second camera 320 for multiple rapid exposures. For example, for the same detection, the following operations can be performed:

[0076] First exposure: Only the upper half of the LED beads on the array light board are lit.

[0077] Second exposure: Only the lower half of the LED beads on the array light board are lit.

[0078] Third exposure: Only the left half of the LED beads on the array light board are lit.

[0079] Fourth exposure: Only the right half of the LED beads on the array light board are lit. (Or more detailed zoning can be adopted, such as scanning and lighting row by row or column by column). By comparing the image information obtained at the same position in these multiple exposures, since real defects (such as pits, filaments, stains) usually maintain their inherent characteristics under different illumination angles, while the position and intensity of the specular reflection points will change significantly with the change of the light source direction. The image processing algorithm can effectively identify and filter out the specular reflection pseudo-defects based on this difference and extract the real defect information.

[0080] According to the solution of the embodiment of the present disclosure, on the one hand, it can accurately match the illumination area with the actual size of the material to be detected, avoiding ineffective illumination of non-detection areas (such as the air above or below the material), thus saving energy. More importantly, it reduces the unnecessary stray light entering the camera lens, improves the signal-to-noise ratio and contrast of the image, and makes the defect detection of the effective area of the material clearer and more accurate.

[0081] On the other hand, the problem of surface detection of high-reflective materials is solved by multiple exposures and zoned illumination. By actively changing the illumination conditions and performing multiple imaging, it can reliably distinguish the real defects on the surface and the artifacts formed by specular reflection, greatly reducing the misjudgment rate (including missed detection and false alarm) caused by reflection. It significantly improves the detection robustness and accuracy of the appearance detection device for various complex surfaces (especially smooth, high-gloss or unevenly reflective surfaces).

[0082] The lifting drive mechanism (such as the lifting drive mechanism corresponding to the first support member 131, or the lifting drive mechanism corresponding to the third camera support member 132) can adopt the following several preferred specific implementation manners:

[0083] Servo / Stepper Motor with Ball Screw Mechanism: The lifting drive mechanism may mainly include a precision motor, such as a servo motor or a stepper motor. The output shaft of the motor is connected to a ball screw through a coupling (not shown). The ball screw is vertically installed. A ball nut is threadedly engaged with the ball screw, and the bottom or side of the ball nut is firmly connected to the lower end of the first vertical rod 131a (or the second vertical rod 132b). When the motor rotates, it drives the ball screw to rotate. Since the rotation of the ball nut is restricted by its connection to the vertical rod, the ball nut will move linearly along the axial direction of the ball screw, thereby driving the first vertical rod 131a (or the second vertical rod 132b) and the camera components (such as the first mounting bracket 321 or the second mounting bracket 331) carried thereon to achieve precise vertical lifting. To ensure the smoothness and guiding property of the movement, an auxiliary support and guiding can also be provided by cooperating with a linear guide near the lower end of the vertical rod or outside the ball nut, and the linear guide is fixed below the lower platform 110.

[0084] Electric Cylinder (Linear Actuator): Another way is to directly use an electric cylinder as the lifting drive mechanism. An electric cylinder is a modular product that directly converts the rotational motion of a servo motor or a stepper motor into a linear reciprocating motion through an internal screw or other mechanical structures. In this solution, the cylinder body of the electric cylinder is fixed below the lower platform 110 or at a suitable position on the frame, and the end of its extending rod (piston rod) is connected to the lower end of the first vertical rod 131a (or the second vertical rod 132b). By controlling the rotation of the motor built into the electric cylinder, the extending rod can be driven to perform precise linear lifting motion, thereby driving the camera components to lift.

[0085] The other components of the above embodiments can adopt various technical solutions known to those of ordinary skill in the art now and in the future, and will not be described in detail here.

[0086] In the description of this specification, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present disclosure.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present disclosure, "a plurality of" means two or more unless otherwise specifically defined.

[0088] In the present disclosure, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure may be understood according to specific circumstances.

[0089] In the present disclosure, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0090] The above disclosure provides many different embodiments or examples for implementing different structures of the present disclosure. To simplify the disclosure of the present disclosure, components and settings of specific examples are described above. Of course, they are only examples and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0091] The above is only the specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present disclosure, and these should all be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. An appearance detection device, comprising: A frame (100), including a lower platform (110) disposed on both sides of a conveying track (200), an upper platform (120) disposed above the lower platform (110), and a plurality of device support components (130); the device support components (130) are connected to at least one of the upper platform (120) and the lower platform (110); A photographing mechanism (300), including a first camera (310) for photographing a first side of a material to be detected, a plurality of second cameras (320) for photographing a second side of the material to be detected, and a third camera (330) for photographing a third side of the material to be detected; the plurality of second cameras (320) are connected to a liftable first support component (131) through a first mounting frame (321); the first support component (131) passes through the lower platform (110) and is connected to a lift driving mechanism; Wherein, the second side is a circumferential surface, and the plurality of second cameras (320) are arranged at intervals around the circumferential surface; the plurality of second cameras (320) are at the same photographing height, and the photographing height is determined according to the type or size of the material to be detected; A lighting mechanism (400), including a top lamp (410) for irradiating the first side, a plurality of side lamps (420) for irradiating the second side, and a bottom lamp (430) for irradiating the third side; the top lamp (410) is connected to the upper platform (120), the plurality of side lamps (420) are connected to the first mounting frame (321), so that the side lamps (420) move synchronously with the corresponding second cameras (320), and the bottom lamp (430) is connected to the lower platform (110).

2. The appearance detection device according to claim 1, wherein, The plurality of second cameras (320) include edge cameras (320a) disposed in the side regions of the lower platform (110), and two edge cameras (320a) are provided on each side of the lower platform (110); the edge cameras (320a) are arranged towards a detection station (210) on the conveying track (200), and the detection station (210) is at the same distance from the plurality of second cameras (320).

3. The appearance detection device according to claim 2, wherein, The plurality of second cameras (320) include middle cameras (320b), at least one middle camera (320b) is provided on the lower platform (110), and the middle camera (320b) is arranged towards the detection station (210) on the conveying track (200); the included angles formed between each two adjacent second cameras (320) in the plurality of second cameras (320) and the detection station (210) are the same.

4. The appearance detection device according to claim 2, wherein, The first support component (131) includes a first vertical rod (131a), the first vertical rod (131a) passes through the lower platform (110) through a bushing (111), and is connected to the lift driving mechanism disposed below the lower platform (110); the top of the first vertical rod (131a) corresponding to the edge camera (320a) is slidably connected to the upper platform (120).

5. The appearance detection device according to claim 4, wherein, The first support member (131) for mounting the side camera (320a) further includes a first cross bar (131b). The first cross bar (131b) is connected to the first vertical bar (131a) through a connecting member (131c). The first end of the first cross bar (131b) is closer to the conveying track (200), and the first end is connected to the first mounting bracket (321).

6. The appearance detection device according to claim 1, wherein, The first mounting bracket (321) includes a bottom plate (321a) and side plates (321b) provided on both sides of the bottom plate (321a). The second camera (320) is disposed on the bottom plate (321a). Both sides of the second camera (320) are respectively connected to one side lamp (420) through the side plates (321b).

7. The appearance detection device according to claim 6, wherein, There is a first included angle of 1° to 30° between the outer surfaces of the two side plates (321b) of each group of first mounting brackets (321). There is a second included angle between a pair of side lamps (420) connected to the side plates (321b), and the second included angle is complementary to the first included angle.

8. The appearance detection device according to claim 1, wherein, The top lamp (410) is an annular lamp, and the first camera (310) takes pictures of the material to be detected below through the hollow part of the annular lamp.

9. The appearance detection device according to claim 1, wherein, The bottom lamp (430) includes a pair of arc lamps respectively disposed on two lower platforms (110).

10. The appearance detection device according to claim 9, wherein, The arc lamp is connected to the slide rail (433) of the lower platform (110) through a connecting member (432). The extending direction of the slide rail (433) is perpendicular to the material conveying direction. The end of the arc lamp intrudes above the conveying track (200). Wherein, the distance between the ends of the pair of arc lamps is greater than the diameter of the corresponding part of the tray for carrying the material to be detected.

11. The appearance detection device according to claim 1, wherein, The third camera (330) is connected to the second support member (132) through a second mounting bracket (331). The second support member (132) includes a second cross bar (132a) and a second vertical bar (132b). The second vertical bar (132b) passes through the lower platform (110) through a bushing (111) and is connected to a lifting drive mechanism disposed below the lower platform (110). The third camera (330) rotates around the second vertical bar (132b).

12. The appearance detection device according to claim 1, wherein, The conveying track (200) includes a conveying roller (201) for carrying and conveying the material to be detected and a guide rail (202) connected to the end of the conveying roller (201). There is a gap between the lower platform (110) and the guide rail (202).

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