A whiteness detector with self-calibration function

Abstract

The application relates to the technical field of whiteness detection, in particular to a whiteness detector with a self-calibration function, which comprises a detection main body structure, the detection main body structure comprising an optical detection assembly and a calibration adjusting assembly. The optical detection assembly drives a detection probe to adjust an angle through a transmission mechanism, and a standard reflection plate is arranged in the calibration adjusting assembly and used for automatic calibration. The optical detection assembly and the calibration adjusting assembly are arranged, the detection probe is driven to adjust a position at different angles through the transmission mechanism during the whiteness detection process, and therefore the light reflection characteristics of different material surfaces can be adapted. Meanwhile, the standard reflection plate in the calibration module can provide a reference reflection signal for the detection probe, when the detection probe returns to an initial position, the system compares the difference between the reference signal and an actual detection signal, and the automatic calibration of the detection probe is completed. The structure design simplifies the complex mechanical structure of a traditional whiteness detection device and reduces manufacturing costs.

Description

Technical Field

[0001] This utility model belongs to the field of optical detection and measurement technology, specifically a whiteness detector with self-calibration function. Background Technology

[0002] In industrial production and quality inspection, whiteness is one of the important indicators for measuring the optical properties of material surfaces. Currently, some whiteness testing equipment based on photoelectric sensors, reflected light measurement, and multi-angle analysis technologies have emerged on the market. However, these devices typically rely on complex mechanical structures and precision optical components, resulting in high manufacturing costs and requiring highly skilled operators. Furthermore, these devices often require periodic manual calibration to ensure the accuracy of the test results, which not only increases maintenance costs but may also affect testing efficiency due to human error. Some existing whiteness testing equipment uses rotating probes and multi-segment adjustment mechanisms to collect light at different angles. These devices are prone to decreased accuracy over long-term use due to component wear or loosening, and lack automatic calibration functions, making it difficult to meet the demands for efficient and accurate testing.

[0003] Therefore, we have made improvements to this and proposed a whiteness detector with self-calibration function. Utility Model Content

[0004] The purpose of this invention is to solve the problems of high manufacturing cost, complex operation and lack of automatic calibration function of existing whiteness detection equipment.

[0005] To achieve the above-mentioned objectives and improve the aforementioned problems, this utility model provides a whiteness detector with self-calibration function, including a detection main structure. The detection main structure includes an optical detection component and a calibration adjustment component. The optical detection component is fixedly connected to the calibration adjustment component via a connecting bracket. The calibration adjustment component has a transmission mechanism inside, which is used to drive the optical detection component to adjust its position at different angles. Guide members are provided on both sides of the calibration adjustment component, and sliding fittings are provided inside the guide members.

[0006] The optical detection assembly includes a detection probe, on which several photosensitive elements are evenly distributed on the outer end face. The photosensitive elements are electrically connected to each other via a flexible circuit board. The end of the flexible circuit board extends to the bottom of the detection probe and is electrically connected to a signal processing module. A rotating shaft is provided at the top of the detection probe. The rotating shaft passes through a connecting bracket and is rotatably connected to it. A connecting shaft is provided at the upper end of the rotating shaft and is fixedly connected to a transmission mechanism.

[0007] As a preferred technical solution of this application, the connecting bracket includes a support plate, and two symmetrically arranged baffles are fixedly connected to the top of the support plate. The two baffles are respectively used to fix the two ends of the rotating shaft. The bottom of the support plate is provided with a positioning boss, and the positioning boss is in contact with the inner side of the calibration and adjustment component.

[0008] As a preferred technical solution of this application, the calibration and adjustment assembly further includes a housing, and a stepper motor is provided inside the baffle. The output shaft of the stepper motor is fixedly connected to a transmission mechanism. The transmission mechanism includes a worm and a worm wheel. One end of the worm is keyed to the output shaft of the stepper motor, and the other end is rotatably connected to the inner wall of the baffle through a bearing seat. The worm wheel is meshed with the worm, and the center hole of the worm wheel is connected to the rotating shaft through a keyway.

[0009] As a preferred technical solution of this application, the guide component includes a guide rail, which is fixedly installed on both sides of the housing. The cross-section of the guide rail is "T" shaped. The sliding mating component includes a slider, which is nested inside the guide rail and fixedly connected to both sides of the connecting bracket.

[0010] As a preferred technical solution of this application, the bottom of the slider is provided with a ball groove, and a number of balls are embedded in the ball groove. The balls roll in contact with the inner wall of the guide rail. The top of the slider is provided with a spring pressure plate, and the spring pressure plate is elastically connected to the outer shell of the detection probe through a compression spring.

[0011] As a preferred technical solution of this application, the housing is further provided with a calibration module. The calibration module includes a standard reflector plate, which is fixedly installed on the inner wall of the housing. The surface of the standard reflector plate is coated with a high reflectivity coating, and the position of the standard reflector plate corresponds to the initial position of the detection probe.

[0012] As a preferred technical solution of this application, a through hole is provided in the middle of the support plate. The through hole is located between two baffles. The diameter of the through hole is larger than the diameter of the rotating shaft. A sealing ring is provided on the inner wall of the through hole. The sealing ring is tightly fitted to the outer wall of the rotating shaft.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: In the scheme of this application: By incorporating optical detection and calibration components, the system enables the detection probe to adjust its position at different angles during whiteness detection via a transmission mechanism, thus adapting to the light reflection characteristics of different material surfaces. Simultaneously, a standard reflector in the calibration module provides a reference reflection signal for the detection probe. When the probe returns to its initial position, the system automatically calibrates the probe by comparing the reference signal with the actual detection signal. This structural design simplifies the complex mechanical structure of traditional whiteness detection equipment, reduces manufacturing costs, and minimizes the need for manual calibration. It also solves the problem of decreased detection accuracy due to component wear or loosening in existing whiteness detection equipment, meeting the demands for efficient and accurate detection. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the optical detection component in this utility model.

[0016] Figure 3 This is a schematic diagram of the transmission mechanism and connecting bracket of this utility model.

[0017] Figure 4 This is a schematic diagram of the structure of the outer shell of this utility model.

[0018] The attached figures are labeled as follows: 1. Main detection structure; 2. Optical detection assembly; 3. Calibration and adjustment assembly; 4. Detection probe; 5. Photosensitive element; 6. Flexible circuit board; 7. Rotating shaft; 8. Connecting shaft; 9. Connecting bracket; 10. Support plate; 11. Baffle; 12. Positioning boss; 13. Housing; 14. Stepper motor; 15. Transmission mechanism; 16. Worm gear; 17. Worm wheel; 18. Guide component; 19. Guide rail; 20. Sliding fit component; 21. Slider; 22. Ball bearing; 23. Spring pressure plate; 24. Calibration module; 25. Standard reflector; 26. Through hole; 27. Sealing ring. Detailed Implementation

[0019] This utility model provides a whiteness detector with self-calibration function, and its specific implementation is described in detail with reference to the accompanying drawings. Figure 1 As shown, the overall structure includes a detection main structure 1, which consists of an optical detection component 2 and a calibration and adjustment component 3. The optical detection component 2 is fixedly connected to the calibration and adjustment component 3 via a connecting bracket 9, forming a stable mechanical fit between them. The specific structure of the connecting bracket 9 is described in... Figure 1As shown in the diagram, it includes a support plate 10, with two symmetrically arranged baffles 11 fixedly connected to the top of the support plate 10 to fix the two ends of the rotating shaft 7. The bottom of the support plate 10 is provided with a positioning boss 12, which is fitted and connected to the inner side of the calibration adjustment component 3 to ensure the relative position between the connecting bracket 9 and the calibration adjustment component 3 is stable.

[0020] The core component of the optical detection assembly 2 is the detection probe 4. Several photosensitive elements 5 are evenly distributed on the outer end face of the detection probe 4, and these photosensitive elements 5 are electrically connected via a flexible circuit board 6. The end of the flexible circuit board 6 extends to the bottom of the detection probe 4 and is electrically connected to the signal processing module, thereby converting the light signal collected by the photosensitive elements 5 into an electrical signal output. A rotating shaft 7 is located at the top of the detection probe 4, passing through and rotatably connecting to the baffle 11 of the connecting bracket 9. A connecting shaft 8 is located at the upper end of the rotating shaft 7, and is fixedly connected to the transmission mechanism 15, thereby enabling the angle adjustment function of the detection probe 4. A through hole 26 is opened in the middle of the support plate 10, located between the two baffles 11. Its diameter is larger than that of the rotating shaft 7, facilitating the free rotation of the rotating shaft 7. A sealing ring 27 is provided on the inner wall of the through hole 26, which fits tightly against the outer wall of the rotating shaft 7 to prevent external dust or impurities from entering the detection main body structure 1.

[0021] The internal structure of calibration adjustment component 3 is as follows Figures 2-3 As shown, it mainly consists of a housing 13, a stepper motor 14, a transmission mechanism 15, and a guide member 18. The stepper motor 14 is housed inside the baffle 11, and its output shaft is fixedly connected to the transmission mechanism 15. The transmission mechanism 15 includes a worm gear 16 and a worm wheel 17. One end of the worm gear 16 is keyed to the output shaft of the stepper motor 14, and the other end is rotatably connected to the inner wall of the baffle 11 via a bearing seat. The worm wheel 17 meshes with the worm gear 16, and its central hole is connected to the rotating shaft 7 via a keyway, thereby transmitting the rotational motion of the stepper motor 14 to the rotating shaft 7 to drive the detection probe 4 to adjust its angle. The transmission mechanism 15 employs a worm gear structure, which effectively reduces vibration and noise during transmission while maintaining high transmission accuracy.

[0022] Both sides of the calibration and adjustment assembly 3 are provided with guide members 18, and the specific structure of the guide members 18 is as follows: Figures 3-4As shown, it includes a guide rail 19 and a sliding engagement component 20. The guide rail 19 is fixedly installed on both sides of the housing 13. The cross-section of the guide rail 19 is "T" shaped. The sliding engagement component 20 includes a slider 21, which is nested inside the guide rail 19 and fixedly connected to both sides of the connecting bracket 9. The bottom of the slider 21 is provided with a ball groove, and several balls 22 are embedded inside the ball groove. The balls 22 roll in contact with the inner wall of the guide rail 19, thereby reducing the sliding friction of the slider 21 in the guide rail 19 and improving the smoothness of the movement of the detection probe 4. The top of the slider 21 is provided with a spring pressure plate 23, which is elastically connected to the housing of the detection probe 4 through a compression spring, ensuring that the slider 21 always maintains a tight contact with the guide rail 19 and avoiding detection errors caused by loosening.

[0023] The housing 13 also houses a calibration module 24, which includes a standard reflector 25 fixedly mounted on the inner wall of the housing 13. The standard reflector 25 is coated with a high-reflectivity coating to provide a stable reference reflection signal. The position of the standard reflector 25 corresponds to the initial position of the detection probe 4. When the detection probe 4 returns to its initial position, the system automatically calibrates the detection probe 4 by comparing the difference between the reference signal and the actual detection signal. The design of the calibration module 24 allows the detection probe 4 to be quickly calibrated before each test, thereby improving the accuracy of the test results.

[0024] In practical applications, the working principle of this invention is as follows: After the stepper motor 14 starts, its output shaft drives the worm gear 16 to rotate, and the worm gear 16 drives the worm wheel 17 to rotate through meshing transmission. Since the center hole of the worm wheel 17 is connected to the rotating shaft 7 through a keyway, the rotating shaft 7 rotates accordingly, thereby driving the detection probe 4 to adjust its position at different angles. The adjustment range of the detection probe 4 is limited by the guide member 18, and the slider 21 slides along the guide rail 19 to ensure that the movement trajectory of the detection probe 4 is stable and accurate. When the detection probe 4 is adjusted to the target angle, the photosensitive element 5 begins to collect the reflected light signal from the surface of the target material and transmits the signal to the signal processing module for analysis through the flexible circuit board 6. After the detection is completed, the stepper motor 14 reverses, driving the detection probe 4 back to the initial position. At this time, the detection probe 4 is aligned with the standard reflector 25. The system calculates the calibration parameters of the detection probe 4 by comparing the difference between the reference signal of the standard reflector 25 and the actual detection signal, and automatically calibrates it. The above process realizes the self-calibration function of the whiteness detector, reducing the need for manual intervention.

[0025] Furthermore, the structural design of this utility model fully considers manufacturing costs and ease of operation. For example, the positioning boss 12 of the support plate 10 is fitted to the inner side of the calibration and adjustment component 3, simplifying the assembly process; the sealing ring 27 set in the through hole 26 not only improves the sealing performance of the equipment but also extends its service life; the design of the ball bearing 22 and spring pressure plate 23 in the guide component 18 significantly reduces sliding friction and improves the operational stability of the equipment. These detailed designs together constitute a highly efficient, accurate, and easy-to-maintain whiteness detector.

[0026] In specific applications, this invention is suitable for whiteness testing of various materials, such as paper, plastics, and textiles. By adjusting the angle of the detection probe 4, the device can adapt to the light reflection characteristics of different material surfaces, thereby obtaining more accurate test results. Simultaneously, the introduction of an automatic calibration function ensures that the device maintains high detection accuracy throughout long-term use, solving the problem of decreased detection accuracy in traditional whiteness testing equipment due to component wear or loosening.

[0027] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of the specific implementation principle of this utility model is provided in conjunction with a specific application scenario.

[0028] In practical applications of paper whiteness detection, the paper sample to be tested is first placed under the detection probe 4, and its position is adjusted manually or automatically to ensure that its surface is within the optimal detection range of the photosensitive element 5 of the detection probe 4. Then, the stepper motor 14 is started, and its output shaft drives the worm gear 16 to rotate. The worm gear 16 drives the worm wheel 17 to rotate through meshing transmission. Since the central hole of the worm wheel 17 is connected to the rotating shaft 7 via a keyway, the rotating shaft 7 rotates accordingly, thereby causing the detection probe 4 to adjust its angle along the guide rail 19. The slider 21 is nested inside the guide rail 19 and rolls against the inner wall of the guide rail 19 via ball bearings 22, ensuring a stable and accurate movement trajectory of the detection probe 4. The spring pressure plate 23 is elastically connected to the outer shell of the detection probe 4 via a compression spring, further ensuring that the slider 21 always maintains tight contact with the guide rail 19, avoiding detection errors caused by loosening.

[0029] Once the detection probe 4 is adjusted to the target angle, the photosensitive element 5 begins to collect the reflected light signal from the paper surface. The photosensitive elements 5 are electrically connected via a flexible circuit board 6, which transmits the collected light signal to the signal processing module for analysis. At this time, the signal processing module calculates the whiteness value of the paper surface according to a preset algorithm and outputs the result to the display unit for the operator to view. After the detection is completed, the stepper motor 14 reverses, driving the detection probe 4 back to its initial position. During this process, the slider 21 in the guide 18 slides smoothly along the guide rail 19, ensuring that the detection probe 4 can accurately return to the corresponding position of the standard reflector 25.

[0030] After the detection probe 4 returns to its initial position, the system automatically initiates the calibration procedure. The standard reflector 25 is fixedly mounted on the inner wall of the housing 13, and its surface is coated with a high-reflectivity coating to provide a stable reference reflection signal. After the detection probe 4 aligns with the standard reflector 25, the photosensitive element 5 again collects the reflected light signal and transmits it to the signal processing module via the flexible circuit board 6. The signal processing module compares the difference between the reference signal and the actual detection signal, calculates the calibration parameters of the detection probe 4, and automatically calibrates it. This process realizes the self-calibration function of the whiteness detector, reducing the need for manual intervention.

[0031] Furthermore, during long-term use, the design of the sealing ring 27 effectively prevents external dust or impurities from entering the interior of the main detection structure 1, extending the service life of the equipment. The positioning boss 12 of the support plate 10 fits snugly against the top plane of the calibration adjustment component 3, simplifying the assembly process while ensuring the relative position stability between the connecting bracket 9 and the calibration adjustment component 3. The through hole 26 not only facilitates the free rotation of the rotating shaft 7 but also improves the sealing performance of the equipment through the sealing ring 27. These detailed designs together constitute a highly efficient, accurate, and easy-to-maintain whiteness detector.

[0032] In the whiteness testing of plastic products, by adjusting the angle of the detection probe 4, the equipment can adapt to the light reflection characteristics of different plastic surfaces, thereby obtaining more accurate test results. For example, for plastic products with smooth surfaces, the detection probe 4 can be adjusted to a smaller angle to reduce the influence of specular reflection; while for plastic products with rough surfaces, the detection angle can be increased to improve detection accuracy. The introduction of the automatic calibration function enables the equipment to maintain high detection accuracy throughout long-term use, solving the problem of decreased detection accuracy in traditional whiteness testing equipment due to component wear or loosening.

[0033] The above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A whiteness detector with self-calibration function, characterized in that, The system includes a detection main structure (1), which includes an optical detection component (2) and a calibration adjustment component (3). The optical detection component (2) is fixedly connected to the calibration adjustment component (3) via a connecting bracket (9). The calibration adjustment component (3) has a transmission mechanism (15) inside, which is used to drive the optical detection component (2) to adjust its position at different angles. The calibration adjustment component (3) has guides (18) on both sides, and the guides (18) have sliding fittings (20) inside.

2. The whiteness detector with self-calibration function according to claim 1, characterized in that, The optical detection assembly (2) includes a detection probe (4). Several photosensitive elements (5) are evenly distributed on the outer end face of the detection probe (4). The photosensitive elements (5) are electrically connected to each other through a flexible circuit board (6). The end of the flexible circuit board (6) extends to the bottom of the detection probe (4) and is electrically connected to the signal processing module. A rotating shaft (7) is provided on the top of the detection probe (4). The rotating shaft (7) passes through the connecting bracket (9) and is rotatably connected to it. A connecting shaft (8) is provided at the upper end of the rotating shaft (7). The connecting shaft (8) is fixedly connected to the transmission mechanism (15).

3. A whiteness detector with self-calibration function according to claim 2, characterized in that, The connecting bracket (9) includes a support plate (10). Two symmetrically arranged baffles (11) are fixedly connected to the top of the support plate (10). The two baffles (11) are used to fix the two ends of the rotating shaft (7). The bottom end of the support plate (10) is provided with a positioning boss (12). The positioning boss (12) is in contact with the inner plane of the calibration adjustment component (3).

4. A whiteness detector with self-calibration function according to claim 3, characterized in that, The calibration adjustment assembly (3) also includes a housing (13). A stepper motor (14) is provided inside the baffle (11). The output shaft of the stepper motor (14) is fixedly connected to the transmission mechanism (15). The transmission mechanism (15) includes a worm (16) and a worm wheel (17). One end of the worm (16) is keyed to the output shaft of the stepper motor (14), and the other end is rotatably connected to the inner wall of the baffle (11) through a bearing seat. The worm wheel (17) is meshed with the worm (16). The center hole of the worm wheel (17) is connected to the rotating shaft (7) through a keyway.

5. A whiteness detector with self-calibration function according to claim 1, characterized in that, The guide (18) includes a guide rail (19), which is fixedly installed on both sides of the housing (13). The cross section of the guide rail (19) is "T" shaped. The sliding mating part (20) includes a slider (21), which is nested inside the guide rail (19) and fixedly connected to both sides of the connecting bracket (9).

6. A whiteness detector with self-calibration function according to claim 5, characterized in that, The bottom of the slider (21) is provided with a ball groove, and a number of balls (22) are embedded in the ball groove. The balls (22) roll in contact with the inner wall of the guide rail (19). The top of the slider (21) is provided with a spring pressure plate (23), and the spring pressure plate (23) is elastically connected to the outer shell of the detection probe (4) through a compression spring.

7. A whiteness detector with self-calibration function according to claim 4, characterized in that, The housing (13) is also equipped with a calibration module (24), which includes a standard reflector (25). The standard reflector (25) is fixedly installed on the inner wall of the housing (13). The surface of the standard reflector (25) is coated with a high reflectivity coating. The position of the standard reflector (25) corresponds to the initial position of the detection probe (4).

8. A whiteness detector with self-calibration function according to claim 3, characterized in that, The support plate (10) has a through hole (26) in the middle. The through hole (26) is located between two baffles (11). The diameter of the through hole (26) is larger than the diameter of the rotating shaft (7). The inner wall of the through hole (26) is provided with a sealing ring (27). The sealing ring (27) is in close contact with the outer wall of the rotating shaft (7).

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