Natural stone texture imitating artificial stone sample color detection device

Abstract

The invention discloses a natural stone texture imitating artificial stone sample color detection device, and relates to the technical field of detection, the natural stone texture imitating artificial stone sample color detection device comprises a vertical machine shell, the vertical machine shell is internally divided into an upper layer mounting area, a middle layer mounting area and a lower layer mounting area along the height direction; the illumination simulation system comprises a first illumination module mounted in the middle-layer mounting area and a second illumination module mounted in the upper-layer mounting area, the first illumination module is used for simulating morning light and evening light in daily life, and the second illumination module is used for simulating noon vertical light; and the sample conveying and positioning mechanism is arranged in the lower-layer mounting area. Through illumination scene precision, detection process automation and module layout rationalization, the core defects of traditional manual detection are effectively overcome, the accuracy and consistency of natural stone imitating artificial stone flower color detection can be improved, the large-scale production requirement can be met, and the method is suitable for large-scale production. The method is of great significance to promotion of industry detection technology upgrading, reduction of user complaints and improvement of product market competitiveness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection, in particular to a kind of imitation natural stone texture artificial stone sample color detection device. BACKGROUND

[0002] In the field of imitation natural stone texture artificial stone production, the consistency and true degree of product color are the core indicators that determine market acceptance, and consumers purchase sample color as a reference, which needs to ensure that the color performance of the product in the actual use environment such as home and commercial space is consistent with the sample, however, the current mainstream color detection method in the industry still mainly relies on traditional manual detection, which has two major defects, which seriously restricts the detection accuracy and product quality stability: First, the color difference between natural stone and artificial stone is essentially the result of the interaction of the incident direction of light, color temperature, stone surface texture concave-convex shape and internal pigment distribution: when morning light is obliquely incident, it will highlight the texture cool tone details, weaken the warm yellow pigment in the stone, and make the base color tend to porcelain white; When the evening light is obliquely incident, it will strengthen the warm tone lines, activate the warm yellow pigment, and make the base color tend to beige and the light brown spots more prominent; When the noon vertical incidence, it weakens the shadow, highlights the overall uniformity, and exposes the subtle defects such as uneven pigment. However, traditional detection is only carried out under a single fixed light source, which cannot reproduce the above-mentioned multiple light scenes, resulting in detection results that cannot match the actual user experience, and frequent complaints of "factory detection qualified but obvious color difference in user's home".

[0003] Second, manual operation is highly dependent, and the detection consistency and efficiency are low. In traditional detection, the sample handling and positioning need to be completed manually, which may cause inconsistent detection angles and distances due to hand shaking and placement position deviation; Color judgment depends on the subjective vision of the detection personnel, which is affected by experience, fatigue and other factors, and the same batch of samples may have different judgments for the same product; At the same time, manual detection can only detect a single sample at a time, and cannot simultaneously cover multiple light scenes, which is low in detection efficiency and difficult to meet the batch detection needs of large-scale production. SUMMARY

[0004] The purpose of the present application is to provide an imitation natural stone texture artificial stone sample color detection device to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose of the application, the following technical solutions are adopted: The imitation natural stone texture artificial stone sample color detection device provided by the present application comprises: A vertical cabinet, the vertical cabinet is divided into an upper installation area, a middle installation area and a lower installation area along the height direction; The lighting simulation system includes a first lighting module installed in the middle layer installation area and a second lighting module installed in the upper layer installation area. The first lighting module is used to simulate the morning light and evening light in daily life, and the second lighting module is used to simulate the midday vertical light. A sample delivery and positioning mechanism is located in the lower installation area and is used to deliver the artificial stone sample to the detection position in the lower installation area. An image acquisition module, located in the upper mounting area, is used to capture color images of samples under different lighting angles; The automatic control module is electrically connected to the illumination simulation system, the sample delivery and positioning mechanism, and the image acquisition module, respectively, and is used to control the coordinated operation of each module to realize the automatic switching of different illumination angles and the automatic acquisition and analysis of pattern images.

[0006] Furthermore, the first lighting module includes at least two sets of angle-adjustable light source groups, which are symmetrically installed on both sides of the middle layer mounting area. Each set of angle-adjustable light source groups includes an LED lamp body and a rotating lamp holder. The rotating lamp holder is used to drive the LED lamp body to rotate around the lamp holder, so that the lighting angle of the LED lamp body can be adjusted to 15°-30°.

[0007] Furthermore, the first illumination module also includes a first lifting drive unit corresponding to the angle-adjustable light source group. The first lifting drive unit is driven and connected to the angle-adjustable light source group to adjust the distance between the angle-adjustable light source group and the sample bearing surface. A first distance sensor is also provided next to the angle-adjustable light source group. The first distance sensor is electrically connected to the automatic control module to provide feedback on the real-time distance between the angle-adjustable light source group and the sample.

[0008] Furthermore, the second illumination module includes at least one set of vertical light sources, which are located in the upper mounting area. The illumination axis of the vertical light sources is perpendicular to the sample bearing surface of the sample delivery and positioning mechanism, and is used to provide 90° vertical illumination.

[0009] Furthermore, the vertical light source group also includes a second lifting drive component, which is connected to the LED lamp body of the vertical light source group for adjusting the distance between the vertical light source group and the sample bearing surface; a second distance sensor is also provided next to the vertical light source group, which is electrically connected to the automatic control module for feedback of the real-time distance between the vertical light source group and the sample.

[0010] Furthermore, the sample delivery and positioning mechanism includes: A synchronous belt conveyor assembly, wherein the surface of the synchronous belt of the synchronous belt conveyor assembly forms a sample bearing surface, and the drive motor of the synchronous belt conveyor assembly is electrically connected to the automatic control module; A photoelectric sensor is located on one side of the lower mounting area to detect whether the sample is in place. The photoelectric sensor is electrically connected to the automatic control module. Adjustable positioning blocks are located on both sides of the lower mounting area to limit the lateral displacement of the sample.

[0011] Furthermore, the image acquisition module includes at least one industrial camera and a macro lens. The industrial camera is fixed to the side of the middle mounting area, the macro lens has a focal length of 20-30mm, the lens axis of the industrial camera is parallel to the sample bearing surface, and the shooting area of ​​the industrial camera coincides with the illumination coverage area of ​​the illumination simulation system. The image acquisition module also includes an image acquisition card, which is electrically connected to the industrial camera and the automatic control module respectively.

[0012] Furthermore, the automatic control module includes a PLC controller, a touch screen, and an image analysis unit. The PLC controller is electrically connected to the drive components of the illumination simulation system, the drive motor of the sample conveying and positioning mechanism, and the image acquisition module, respectively. The touch screen is electrically connected to the PLC controller and is used to input detection parameters and display detection results. The image analysis unit has a built-in standard pattern database and is used to perform color difference calculation and texture consistency comparison between the acquired pattern images and standard images, and generate a detection report.

[0013] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects: 1. The device of this invention achieves full coverage of users' core daily lighting scenarios through the scientific design of the lighting simulation system. The first lighting module can accurately reproduce morning and evening light by adjusting the oblique angle from 15° to 30° and switching between cool white light and warm yellow light color temperature. The second lighting module (vertical light source group) restores the characteristics of midday light in weakening shadows and restoring original colors through neutral white light and 90° vertical illumination. At the same time, the cooperation between the first and second lifting drive components and the distance sensor can adjust the distance between the light source and the sample in real time according to the sample thickness, ensuring that the lighting effect of samples of different specifications is consistent with the actual use scenario, thereby reducing user color difference complaints caused by lighting differences from the root.

[0014] 2. The vertical housing of this invention adopts a layered design with an upper, middle and lower mounting area, which orderly separates the illumination simulation system, sample delivery and positioning mechanism and image acquisition module. This not only avoids the interference of light source heat and mechanical vibration on image acquisition, but also achieves compact integration of each functional module. Compared with traditional distributed detection equipment, the space occupancy rate of this device is reduced by more than 40%, while ensuring that each module operates independently and stably during the detection process, laying a structural foundation for detection accuracy.

[0015] 3. This invention uses an automatic control module to coordinate the collaborative work of various components, achieving full automation of the entire process of feeding, positioning, illumination switching, image acquisition, analysis, and unloading. The feeding and unloading robotic arms replace manual handling, avoiding sample scratches and positional displacement; the sample conveying and positioning mechanism can accurately position the sample to the preset detection position; the automatic control module drives illumination switching and image acquisition simultaneously, shortening the detection time for a single sample; the image analysis unit automatically determines defects such as color difference and texture misalignment by comparing with a standard color database, eliminating subjective judgment errors and improving the consistency of the detection of samples in the same batch.

[0016] 4. The adjustable angle, color temperature, and spacing of the illumination module of this invention can adapt to artificial stone samples with different textures, raised heights, and thicknesses, avoiding blind spots in detection caused by differences in sample specifications. The closed-loop control of the rotating lamp holder and the precision transmission of the lifting drive ensure that the detection conditions for samples in the same batch are completely consistent, avoiding misjudgments caused by fluctuations in illumination angle and distance. At the same time, the device supports continuous batch detection, and with the addition of loading and unloading robots, it can achieve 24-hour uninterrupted operation, meeting the detection needs of large-scale production lines and significantly improving production efficiency and product quality stability.

[0017] In summary, this device effectively addresses the core shortcomings of traditional manual inspection through precise lighting scenarios, automated inspection processes, and rational module layout. It not only improves the accuracy and consistency of color detection for artificial stone imitations, but also adapts to the needs of large-scale production. This is of great significance for promoting the upgrading of industry inspection technology, reducing user complaints, and enhancing product market competitiveness.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the illumination simulation system and image acquisition module of the present invention; Figure 3 yes Figure 2 A front view structural diagram; Figure 4 yes Figure 2 Another perspective structural diagram; Figure 5 This is a schematic diagram of the structure of the second illumination module of the present invention; Figure 6 yes Figure 5 A schematic diagram of the partial structure at point A; Figure 7 yes Figure 5 Another perspective structural diagram.

[0021] In the picture: 1-Vertical housing; 11-Upper mounting area; 12-Middle mounting area; 13-Lower mounting area; 2-Illumination simulation system; 21-First illumination module; 211-LED lamp body; 212-Rotating lamp holder; 2121-Mounting base; 2122-Lamp holder; 2123-Rotating shaft; 2124-Stepper motor; 213-First lifting drive component; 2131-Mounting base plate; 2132-Sliding seat; 2133-Screw drive mechanism; 214-First distance sensor; 22-Second illumination module; 221-Second lifting drive component; 2211-Sliding component; 2212-Lifting base plate; 2213-Electric telescopic cylinder; 222-Second distance sensor; 3-Sample conveying and positioning mechanism; 41-Industrial camera; 42-Macro lens; 5-Loading robot; 6-Unloading robot. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0023] In the color testing of artificial stone with imitation natural stone textures, traditional testing methods heavily rely on manual operation and observation is conducted only under a single, fixed light source (such as a laboratory ceiling light). However, the color of natural stone and artificial stone differs significantly under different lighting angles. When the morning light shines obliquely, cool white light highlights the cool-toned details of the texture; when the evening light shines obliquely, warm yellow light enhances the warm-toned patterns; and when the midday light shines perpendicularly at 90°, shadows are weakened, and the overall uniformity is presented. Because manual testing cannot cover these diverse lighting scenarios, complaints often arise that the color of the manufactured product differs significantly from the sample in the user's actual usage environment.

[0024] Therefore, please refer to the figure. The present invention provides a device for detecting the color of artificial stone samples with imitation natural stone texture, which includes a vertical housing 1, an illumination simulation system 2, a sample conveying and positioning mechanism 3, an image acquisition module and an automatic control module. The components are scientifically arranged to achieve functional synergy.

[0025] The vertical housing 1 is made of 304 stainless steel and forms a sealed detection chamber inside. To avoid mutual interference between different modules and to make compact use of space, the detection chamber is divided into an upper installation area 11, a middle installation area 12 and a lower installation area 13 along the height direction. This allows the functional modules such as the light simulation system 2, the sample delivery and positioning mechanism 3 and the image acquisition module to be separated in an orderly manner, laying a structural foundation for subsequent accurate detection.

[0026] As the core solution to the problem of disconnect between traditional detection scenarios, the illumination simulation system 2 includes a first illumination module 21 installed in the middle mounting area 12 and a second illumination module 22 installed in the upper mounting area 11. The first illumination module 21 and the second illumination module 22, through their positional distribution and functional coordination, can simulate illumination from different directions, angles, and color temperatures. Specifically, the first illumination module 21 simulates morning and evening light, while the second illumination module 22 simulates midday vertical light. The adjustable parameters of the first illumination module 21 and the second illumination module 22 cover the actual illumination conditions encountered by users, ensuring that the detection scenario is consistent with the real environment.

[0027] To ensure the consistency of sample position during the testing process and reduce the interference of position deviation on image acquisition, the sample delivery and positioning mechanism 3 is used to automatically deliver the artificial stone sample to the detection position of the lower installation area 13, or to remove the sample after the test is completed, so as to ensure that the sample is in the same preset position during the test and avoid the influence of position error on the test results.

[0028] The image acquisition module is precisely matched with the detection position. It is installed in the upper installation area 11 with the lens facing the lower detection position. It can stably capture the pattern images of the sample under different lighting angles, ensuring the consistency of the viewing angle and distance of each acquired image, and providing standardized data for subsequent image analysis.

[0029] As the core control unit of the device, the automatic control module is electrically connected to the illumination simulation system 2, the sample delivery and positioning mechanism 3, and the image acquisition module. Through unified control logic, it coordinates the working rhythm of each module to realize automatic switching of illumination angle, precise delivery and positioning of sample, and automatic acquisition and analysis of pattern images.

[0030] During actual testing, after the operator places the sample on the conveying and positioning mechanism, the device will automatically start the testing process. First, the conveying and positioning mechanism sends the sample to the testing position in the lower installation area 13 and fixes it. Then, the automatic control module drives the first illumination module 21 and the second illumination module 22 to switch to different illumination angles as needed according to the preset program. After the illumination stabilizes, the image acquisition module is controlled to capture the pattern image at the corresponding angle. After the acquisition is completed, the automatic control module processes and analyzes the image and coordinates each module to prepare for the next test.

[0031] The core advantage of this invention lies in its targeted solution to the pain points of traditional detection. Through a layered layout design, it achieves compact integration and functional isolation of core modules such as illumination, transmission, and acquisition, effectively avoiding mutual interference between modules. The adjustable direction, angle, and color temperature of the first illumination module 21 and the second illumination module 22 can accurately reproduce diverse illumination conditions in daily scenarios, solving the problem of the disconnect between traditional detection and the actual user environment. Furthermore, the automated process control further improves the consistency and efficiency of detection.

[0032] It should be further explained that the color of artificial stone with natural stone texture varies under different lighting angles. This is essentially the result of the interaction between the incident direction of light, color temperature, the texture of the stone surface, and the distribution of pigments inside. Specifically, in the three core lighting scenarios that this device focuses on simulating—slanting morning light (cool white light), slanting twilight light (warm yellow light), and vertical midday light (neutral white light)—the color will show significant differences in three key dimensions: texture three-dimensionality, color depth, and hue tendency. These differences directly affect the user's actual perception of the product's color.

[0033] This can be understood more intuitively by combining it with common imitation marble artificial stone: In the morning light, cool white light shines at a low angle from the left side of the installation (simulating natural light from the east), illuminating the artificial stone surface. The raised, sunlit side reflects more cool white light, appearing light gray; while the shaded side forms narrow, sharp shadows, making the boundaries of the gray veins clearer. At the same time, the cool white light weakens the trace amounts of warm yellow pigment in the stone, making the off-white base color closer to porcelain white, and the gray veins also lean towards a cool gray tone. Although the twilight scene is also obliquely lit, the incident light has a lower color temperature (warm yellow light) and enters from the right side of the installation (simulating natural light from the west). At this time, the warm hue reflected by the light-facing side of the texture will cause the gray texture to turn into warm gray, while the shadow on the backlit side will be wider and the edges will be more blurred. The trace amount of warm yellow pigment in the stone is activated, and the base color changes from porcelain white to beige. If the stone contains light brown spots, these spots will be more prominent.

[0034] In the midday light scenario, neutral color temperature light shines vertically downwards from the top of the device (simulating midday sunlight or indoor ceiling lights). Because the light is incident vertically, the stone surface hardly produces any obvious shadows. The color presentation depends more on the color uniformity, and the three-dimensionality of the texture is greatly reduced. However, minor flaws such as uneven pigmentation (such as a 0.1-level deviation in the depth of gray veins) and light yellow spots will be clearly exposed. Neutral white light can also restore the true color of the stone to the greatest extent.

[0035] Therefore, the color difference of artificial stone with natural stone texture under different lighting angles is the result of the combined effects of shadow effects, color temperature, and surface reflection. If only a single angle is used for testing, it is very easy to encounter the problem of "passing factory testing but showing obvious color difference when used in the user's home." This is the fundamental reason why this device needs to focus on simulating three core lighting angles to ultimately ensure that artificial stone products can meet design standards in various daily use scenarios.

[0036] To accurately reproduce the characteristics of two typical low-angle oblique light sources, morning light and twilight light, in this embodiment, the first lighting module 21 includes at least two sets of angle-adjustable light source groups symmetrically installed on both sides of the middle layer installation area 12. The two sets of angle-adjustable light source groups correspond to the natural incident directions of east (left) and west (right), respectively, perfectly adapting to the different illumination directions of morning light and twilight light. Each set of angle-adjustable light source groups includes a lamp body 211 and a rotating lamp holder 212. The lamp body 211 adopts a dual color temperature design, which can accurately switch to cool white light (color temperature 5000K-6500K, suitable for morning light) or warm yellow light (color temperature 2700K-3500K, suitable for twilight light) according to the simulation requirements. The rotating lamp holder 212 can drive the lamp body 211 to rotate around the lamp holder 2122, and stably adjust the illumination angle to a natural oblique light range of 15°-30°, providing basic conditions for the simulation of the two lighting scenarios.

[0037] Specifically, in the lighting simulation process, when simulating morning light, the rotating lamp holder 212 of the left-side adjustable light source group first adjusts the lamp body 211 to an oblique angle of 15°-30°, and then switches to cool white light mode. The light enters from the east at a low angle. At this time, the raised, light-facing surface of the artificial stone texture will reflect more cool white light, forming a cool gray reflection. The backlit surface will produce sharp shadows due to the light blocking, making the texture boundaries clearer. At the same time, the cool white light will weaken the trace amount of warm yellow pigment inside the stone, making the base color closer to porcelain white and the gray texture lean towards cool gray. To recreate the realistic visual effect under the morning light; when simulating twilight, the right-side adjustable light source group also adjusts the lamp body 211 to an oblique angle of 15°-30°, and simultaneously switches to the warm yellow light mode. The light enters from the west at a low angle, and the texture facing the light will appear warm gray due to the reflection of the warm yellow light. The shadow on the back side is wider and the edges are blurred. The trace amount of warm yellow pigment in the stone will be activated by the warm yellow light, making the base color lean towards beige. If the stone contains light brown spots, these spots will also be more prominent, accurately reproducing the color characteristics under twilight.

[0038] In addition to precisely matching fixed scenes of morning and twilight, the adjustable light source group also has stronger adaptability. For example, when dealing with artificial stone samples of different thicknesses and texture protrusion heights, operators can finely adjust the angle of the rotating lamp holder 212 to ensure that the oblique light can always effectively highlight the texture details and avoid detection blind spots caused by sample size differences. At the same time, the locking function of the rotating lamp holder 212 can ensure the consistency of the illumination angle during the detection of samples in the same batch, avoid detection errors caused by angle fluctuations, and further improve the authenticity and reliability of pattern detection.

[0039] To achieve precise adjustment and stable locking of the illumination angle, specifically, the rotating lamp holder 212 includes a mounting base 2121 fixed to the middle mounting area 12, and a lamp holder 2122 rotatably mounted on the mounting base 2121 via a rotating shaft 2123. The lamp body 211 is fixed on the lamp holder 2122 and rotates synchronously with the lamp holder 2122. One end of the mounting base 2121 is equipped with a stepper motor 2124 to drive the rotating shaft 2123 to rotate, enabling precise angle adjustment and meeting the accurate positioning requirements within the range of 15°-30°. The other end of the mounting base 2121 is equipped with an angle sensor (not shown), which can detect the actual rotation angle of the rotating shaft 2123 in real time and feed the angle information back to the automatic control module, forming a closed-loop control with the stepper motor 2124. When the angle reaches the preset value, the stepper motor 2124 immediately stops running, ensuring stable locking after the illumination angle is adjusted and avoiding angle deviation due to vibration or other factors during the detection process.

[0040] When simulating low-angle oblique light such as morning and twilight, the first illumination module 21 has matched the incident range of 15°-30° through angle adjustment. However, in actual testing, the thickness of artificial stone samples varies (such as the common 5mm-20mm specifications). If the distance between the angle-adjustable light source group and the sample bearing surface is fixed, it will cause deviations in the illumination range, light intensity, and shadow projection effect of the oblique light on the sample surface. To address this, in this embodiment, the first illumination module 21 is specially equipped with a first lifting drive component 213 corresponding to the angle-adjustable light source group, and a first distance sensor 214 is configured next to the angle-adjustable light source group. Through the design of lifting adjustment and real-time distance measurement, the adaptation problem caused by fixed distance is solved.

[0041] The first distance sensor 214 is a high-precision laser rangefinder sensor, which is fixed to the side of the lamp holder 2122 of the angle-adjustable light source group by a customized L-shaped bracket. Its detection axis is strictly parallel to the sample bearing surface to ensure that the distance information fed back in real time truly reflects the actual distance between the light source group and the sample surface. At the same time, the first distance sensor 214 is electrically connected to the automatic control module through a high-speed data bus, which can realize the millisecond-level transmission of distance data and provide timely data support for subsequent precise adjustment.

[0042] In actual operation, the operator first inputs the thickness parameters of the sample to be tested into the interactive interface of the automatic control module. The control module immediately calculates the optimal distance between the angle-adjustable light source group and the sample bearing surface, based on the preset standard that the oblique light must cover 120% of the sample detection area to avoid edge omission. Subsequently, the first distance sensor 214 automatically starts, collecting the actual distance between the angle-adjustable light source group and the sample surface in real time and feeding it back to the automatic control module. The control module compares the actual distance with the calculated optimal distance. If there is a deviation, it immediately sends a precise drive command to the first lifting drive component 213 to ensure that the distance between the angle-adjustable light source group and the sample surface remains stable at the optimal state. This provides dual protection of angle and distance for simulating morning and twilight scenes, making the test results more consistent with the color performance in the user's actual usage environment.

[0043] To further ensure that the first lifting drive 213 can stably output precise lifting actions, the first lifting drive 213 includes a mounting base 2131 fixedly installed on the side frame of the middle mounting area 12 of the vertical housing 1, a sliding seat 2132 slidably connected to the surface of the mounting base 2131 via a linear slide rail, and a screw drive mechanism 2133 for driving the sliding seat 2132 to slide vertically along the linear slide rail. The angle-adjustable light source group is installed on the mounting base 2131. The screw drive mechanism 2133 adopts a precision ball screw and is driven by a servo motor to achieve precise lifting adjustment. It can meet the fine distance adjustment requirements of samples with different thicknesses and ensure that the sliding seat 2132 does not shake or deviate during the lifting process.

[0044] In this embodiment, the second illumination module 22 includes at least one set of vertical light sources. The at least one set of vertical light sources is fixedly located at the center of the upper installation area 11 (if the sample detection area is large, it can be expanded into multiple symmetrically distributed vertical light sources to ensure full illumination coverage). Each set of vertical light sources uses high color rendering neutral white LED beads (color temperature 4000K-4500K, precisely matching the color temperature of noon natural light). A frosted soft light diffuser is installed in front of the LED beads to avoid glare caused by direct light. The illumination axis of the vertical light source set is perpendicular to the sample bearing surface of the sample conveying and positioning mechanism 3, which is used to provide 90° vertical illumination and restore the characteristics of noon light to weaken shadows and restore the original color.

[0045] After the vertical light source is powered on, the light shines directly onto the sample surface along the vertical axis. Because there is no tilt angle, it does not create obvious shadows on the raised areas of the artificial stone texture. The color representation depends entirely on the uniformity of the stone's own color. Neutral white light can best reproduce the true color of the stone, neither too cool nor too warm, while clearly exposing minor imperfections such as uneven pigment distribution (e.g., a 0.1-level deviation in gray vein depth) and light yellow spots. This ensures that the test results match the user's actual usage environment, allowing subsequent image analysis to accurately identify color and texture defects, further improving the reliability of the test results.

[0046] In this embodiment, the second illumination module 22 further includes a second lifting drive component 221, which is drivenly connected to the lamp body 211 of the vertical light source group and is used to adjust the distance between the vertical light source group and the sample bearing surface; a second distance sensor 222 is also provided next to the vertical light source group, which is electrically connected to the automatic control module and is used to provide feedback on the real-time distance between the vertical light source group and the sample.

[0047] During operation, the operator first inputs the thickness parameters of the sample to be tested into the automatic control module. The control module, based on the preset standard that "vertical illumination should uniformly cover 120% of the sample detection area and the illumination intensity should be stable (matching the intensity of natural midday light)," automatically calculates the optimal distance between the vertical light source group and the sample bearing surface. Subsequently, the second distance sensor 222 is activated, collecting the current distance in real time and feeding it back to the control module. The control module compares the actual distance with the optimal distance. If there is a deviation, it immediately sends a command to the second lifting drive component 221 to ensure that regardless of the sample specifications, vertical illumination can stably restore the true color of the stone and clearly expose minor flaws. It also ensures the consistency of the testing conditions for the same batch of samples, avoiding misjudgments or omissions caused by distance deviations, and further improving the reliability of midday light scene detection.

[0048] In this embodiment, the second lifting drive component 221 includes a lifting base plate 2212 slidably mounted on the top frame of the upper mounting area 11 of the vertical housing 1 via four sets of sliding members 2211, and an electric telescopic cylinder 2213 mounted between the top frame of the upper mounting area 11 and the lifting base plate 2212. The vertical light source group is mounted on the bottom of the lifting base plate 2212. The electric telescopic cylinder 2213 can realize the smooth linear lifting of the lifting base plate 2212. With the guiding effect of the sliding members 2211, it ensures that the lifting base plate 2212 remains horizontal during movement, avoiding the offset of the illumination axis caused by the tilt of the vertical light source group.

[0049] In this embodiment, the sample conveying and positioning mechanism 3 includes a synchronous belt conveying assembly, a photoelectric sensor, and adjustable positioning blocks. The synchronous belt surface of the synchronous belt conveying assembly is sanded to form a stable sample bearing surface. Its drive motor is electrically connected to the automatic control module. It can achieve uniform and stable sample conveying through a preset program, replacing manual pushing to improve efficiency. A photoelectric sensor that communicates with the automatic control module in real time is installed on one side of the lower mounting area 13. When the sample is conveyed to the preset detection position, the photoelectric sensor triggers the automatic control module through the light path blocking signal, and immediately commands the drive motor to stop, ensuring that the sample's front and rear positions are accurately aligned. The adjustable positioning blocks located on both sides of the lower mounting area 13 can be adjusted laterally through the bottom T-shaped slide groove and locking knob, which can adapt to samples of different specifications with widths of 300mm-600mm and limit their lateral displacement.

[0050] In this embodiment, the synchronous belt conveying component of the sample conveying and positioning mechanism 3 is further optimized based on the original design. To achieve unmanned operation of the entire process of loading, testing, and unloading, the synchronous belt conveying component is sequentially planned into a loading area, a testing area, and an unloading area along the conveying direction. The three areas have clear functions and are smoothly connected to form an automated conveying and testing line. The testing area corresponds to the installation position of the vertical housing 1. The vertical housing 1 is fixedly installed above the testing area to ensure that the testing position of the lower installation area 13 inside the housing is completely aligned with the surface of the synchronous belt, so that the sample can be smoothly conveyed to the preset testing position inside the testing chamber, matching the detection range of the illumination simulation system 2 and the image acquisition module, avoiding detection deviations caused by area misalignment. The loading area serves as the initial end of the sample entering the testing link and is used to receive the sample to be tested. The unloading area serves as the end after the testing is completed and is used to temporarily store qualified or re-tested samples, realizing the orderly flow of the testing process.

[0051] To completely replace manual loading and unloading operations (avoiding sample position displacement and surface scratches caused by manual handling), a loading robot 5 is installed on one side of the loading area and a unloading robot 6 is installed on one side of the unloading area. The moving ends of both robots are integrated with suction cup components adapted to artificial stone samples.

[0052] Meanwhile, both the loading robot 5 and the unloading robot 6 are electrically connected to the automatic control module. Through a preset program, they work in tandem with the synchronous belt conveyor components. Before the test begins, the loading robot 5 grabs the sample to be tested from the sample turnover rack according to the instructions and places it precisely on the surface of the synchronous belt in the loading area. The synchronous belt then starts and transports the sample to the testing area. After the test is completed, the synchronous belt transports the sample from the testing area to the unloading area. The unloading robot 6 then grabs the sample according to the instructions and places it in the qualified sample stage or the turnover box to be retested according to the test results (qualified / unqualified) fed back by the automatic control module.

[0053] In this embodiment, the image acquisition module includes at least one industrial camera 41, a macro lens 42, and an image acquisition card (not shown). The industrial camera 41 is fixed at the center of the lifting base plate 2212 in the upper mounting area 11. Paired with a macro lens 42 with a focal length of 20-30mm, it can cover the sample detection area and clearly capture texture details. To optimize the synergy between lighting and shooting, the vertical light source group adopts a ring-shaped light group, coaxially set outside the industrial camera 41, ensuring that the light illuminates the sample along the lens axis and reducing additional shadow interference. The lens axis of the industrial camera 41 is strictly perpendicular to the sample bearing surface, and the shooting area completely coincides with the lighting coverage area of ​​the lighting simulation system 2 to avoid missed shots due to field of view deviation. The image acquisition card is electrically connected to the industrial camera 41 and the automatic control module, and can transmit the high-definition images captured by the camera to the control module in real time, providing high-quality data for subsequent analysis.

[0054] In this embodiment, the automatic control module (not shown) includes a PLC controller, a touch screen, and an image analysis unit. The PLC controller, as the core, is electrically connected to the drive components of the illumination simulation system 2 (such as the first lifting drive component 213 and the second lifting drive component 221), the drive motor of the sample conveying and positioning mechanism 3, and the image acquisition module, respectively. It precisely controls the timing of each module's actions through preset logic. The touch screen is electrically connected to the PLC controller, which supports operators to input parameters such as sample thickness and detection mode, and can also display the detection progress, image preview, and final results in real time, realizing human-machine interaction visualization. The image analysis unit has a built-in standard color database. By calculating the color difference and comparing the texture consistency of the acquired image with the standard image, it automatically identifies defects such as color deviation and texture misalignment, and generates a report containing detection data and judgment results.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for detecting the color and texture of artificial stone samples with imitation natural stone patterns, characterized in that, include: A vertical housing, wherein the interior of the vertical housing is divided into an upper installation area, a middle installation area and a lower installation area along the height direction; The lighting simulation system includes a first lighting module installed in the middle layer installation area and a second lighting module installed in the upper layer installation area. The first lighting module is used to simulate the morning light and evening light in daily life, and the second lighting module is used to simulate the midday vertical light. A sample delivery and positioning mechanism is located in the lower installation area and is used to deliver the artificial stone sample to the detection position in the lower installation area. An image acquisition module, located in the upper mounting area, is used to capture color images of samples under different lighting angles; The automatic control module is electrically connected to the illumination simulation system, the sample delivery and positioning mechanism, and the image acquisition module, respectively, and is used to control the coordinated operation of each module to realize the automatic switching of different illumination angles and the automatic acquisition and analysis of pattern images.

2. The device for detecting the color and texture of artificial stone samples with imitation natural stone texture according to claim 1, characterized in that, The first lighting module includes at least two sets of angle-adjustable light source groups, which are symmetrically installed on both sides of the middle layer mounting area. Each set of angle-adjustable light source groups includes an LED lamp body and a rotating lamp holder. The rotating lamp holder is used to drive the LED lamp body to rotate around the lamp holder, so that the lighting angle of the LED lamp body can be adjusted to 15°-30°.

3. The device for detecting the color and texture of artificial stone samples with imitation natural stone texture according to claim 1, characterized in that, The first illumination module also includes a first lifting drive unit corresponding to the angle-adjustable light source group. The first lifting drive unit is driven and connected to the angle-adjustable light source group and is used to adjust the distance between the angle-adjustable light source group and the sample bearing surface. A first distance sensor is also provided next to the angle-adjustable light source group. The first distance sensor is electrically connected to the automatic control module and is used to provide feedback on the real-time distance between the angle-adjustable light source group and the sample.

4. The device for detecting the color and texture of artificial stone samples with imitation natural stone texture according to claim 1, characterized in that, The second illumination module includes at least one set of vertical light sources, which are located in the upper mounting area. The illumination axis of the vertical light sources is perpendicular to the sample bearing surface of the sample delivery and positioning mechanism, and is used to provide 90° vertical illumination.

5. The device for detecting the color and texture of artificial stone samples with imitation natural stone texture according to claim 4, characterized in that, The vertical light source group also includes a second lifting drive component, which is connected to the LED lamp body of the vertical light source group and is used to adjust the distance between the vertical light source group and the sample bearing surface. A second distance sensor is also provided next to the vertical light source group, which is electrically connected to the automatic control module and is used to provide feedback on the real-time distance between the vertical light source group and the sample.

6. The device for detecting the color and texture of artificial stone samples with imitation natural stone texture according to claim 1, characterized in that, The sample delivery and positioning mechanism includes: A synchronous belt conveyor assembly, wherein the surface of the synchronous belt of the synchronous belt conveyor assembly forms a sample bearing surface, and the drive motor of the synchronous belt conveyor assembly is electrically connected to the automatic control module; A photoelectric sensor is located on one side of the lower mounting area to detect whether the sample is in place. The photoelectric sensor is electrically connected to the automatic control module. Adjustable positioning blocks are located on both sides of the lower mounting area to limit the lateral displacement of the sample.

7. The device for detecting the color and texture of artificial stone samples with imitation natural stone texture according to claim 5, characterized in that, The image acquisition module includes at least one industrial camera and a macro lens. The industrial camera is fixed to the side of the middle mounting area. The focal length of the macro lens is 20-30mm. The lens axis of the industrial camera is parallel to the sample bearing surface, and the shooting area of ​​the industrial camera coincides with the illumination coverage area of ​​the illumination simulation system. The image acquisition module also includes an image acquisition card, which is electrically connected to the industrial camera and the automatic control module.

8. The device for detecting the color and texture of artificial stone samples with imitation natural stone texture according to claim 5, characterized in that, The automatic control module includes a PLC controller, a touch screen, and an image analysis unit. The PLC controller is electrically connected to the drive components of the illumination simulation system, the drive motor of the sample conveying and positioning mechanism, and the image acquisition module. The touch screen is electrically connected to the PLC controller and is used to input detection parameters and display detection results. The image analysis unit has a built-in standard pattern database and is used to calculate color difference and compare texture consistency between the acquired pattern images and standard images, and generate a detection report.

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