Sunlight self-following reflection system and control method

Abstract

The invention relates to the technical field of automobile body paint weather resistance testing, in particular to a sunlight self-following reflection system and a control method, and the sunlight self-following reflection system comprises a buried support, a rotation driving mechanism, a rotation platform and a mirror reflection mechanism. The rotary driving mechanism rotates by 360 degrees in a horizontal plane through a driving unit, so that the direction of a vehicle head is always aligned with a solar azimuth angle; the mirror reflection mechanism adjusts the pitching angle of a reflection plate through a micro motor, and it is ensured that sunlight is projected to the surface of a vehicle body with a preset standard irradiance value. The system further comprises an air supply mechanism and an online measuring instrument which are used for cooling, dedusting and tracking the position of the sun in real time. According to the invention, test errors caused by solar altitude changes and regional differences can be eliminated, and the comparability and repeatability of test results are significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile body paint weather resistance test, in particular to a sunlight self-following reflection system and a control method BACKGROUND

[0002] In the development process of new car models, the weather resistance of the body paint is a crucial performance indicator. As a means of transportation exposed to the outdoors for a long time, the surface of the automobile body is continuously subjected to the combined effects of sunlight radiation, temperature changes, humidity fluctuations, rainwater erosion, and dew condensation. These complex environmental conditions have a significant impact on the paint layer of the automobile body, leading to gradual aging phenomena such as color fading, gloss reduction, chalking, cracking, and even peeling. The aging of the paint not only affects the aesthetic appearance of the automobile, but also reduces the overall grade and market value of the vehicle, and even has an impact on the corrosion resistance and structural strength of the body.

[0003] In the process of evaluating the weather resistance of automobile paint, long-term exposure testing under natural climate conditions is a commonly used method. However, this method has certain limitations. First, the intensity of solar radiation varies significantly depending on geographical location. For example, in different geographical latitudes, altitudes, and climate zones, the total solar irradiance and ultraviolet intensity reaching the ground can vary greatly, with solar radiation in equatorial regions generally stronger than in high latitudes. Second, even at the same location, solar radiation conditions change dynamically over time. Therefore, when testing the weather resistance of paint under natural climate conditions, the reference value and comparability of the test results are easily affected. When testing is conducted at different geographical locations or different time periods at the same location, the actual solar radiation dose and spectral distribution received by the body will vary due to changes in solar elevation angle and atmospheric conditions. This difference makes it difficult to standardize test results, thereby challenging the accurate evaluation of the inherent weather resistance of paint materials.

[0004] In order to solve the above problems, various improved schemes have been proposed in the prior art, but there are still certain deficiencies in actual application. For example, traditional fixed-angle exposure testing results in significant fluctuations in irradiance due to changes in solar position, longer testing periods, and the inability to completely eliminate the effects of regional and seasonal differences. In addition, although some testing equipment can adjust the reflection angle through mechanical structures, it is often difficult to achieve real-time and accurate tracking of the solar azimuth and elevation, limiting the repeatability and consistency of test results. Therefore, how to design a system that can project constant standard irradiance under natural conditions has become a technical problem to be solved. SUMMARY

[0005] One of the technical problems to be solved by the present application is how to project constant standard irradiance to the weather resistance test of automobile body paint under natural climate conditions, while eliminating the test error caused by the change of solar elevation angle and regional differences.

[0006] To solve the above technical problems, the present application provides a sunlight self-following reflection system, comprising: A buried support is fixed below the ground and extends upward, used for bearing the weight of the entire system and ensuring its stability; A rotating drive mechanism is installed on the buried support; A rotating platform is connected to the buried support through the rotating drive mechanism, and the rotating platform is used for bearing the automobile to be tested, and the rotating drive mechanism is used for driving the rotating platform to rotate 360° in the horizontal plane; At least one mirror reflection mechanism is arranged on the rotating platform, and the mirror reflection mechanism is used for projecting sunlight to the surface of the automobile body at a preset standard irradiance value; The rotating platform is further provided with: At least one online measurement instrument, which is configured to obtain the azimuth and elevation angle data of the sun in real time; A standard irradiance sensor is arranged in the target irradiation area near the surface of the automobile to be tested, used for measuring the actual irradiance value of the reflected light in the area in real time; and A control module is electrically connected to the rotating drive mechanism, mirror reflection mechanism, online measurement instrument and standard irradiance sensor.

[0007] In some embodiments, the rotating drive mechanism comprises a driving unit, a rotating disc and a support frame, the support frame is fixedly connected to the middle part of the upper end of the buried support, the driving unit is installed on the lower surface of the support frame, the output end of the driving unit is drivingly connected to the lower surface of the rotating disc through a driving shaft, and the rotating disc is fixedly connected to the rotating platform above. A plurality of connecting frames are uniformly arranged along the circumference of the rotating disc, the lower end of each connecting frame is fixedly connected to the upper surface of the buried support perpendicularly, the upper end of each connecting frame is rotatably connected to a guide wheel, the upper ends of all the guide wheels are jointly attached to the outer periphery of the lower surface of the rotating disc, which provides stable rolling support for the rotating disc to reduce the frictional resistance when rotating, a plurality of limiting claws are fixedly connected to the buried support, and the upper ends of the limiting claws are arranged outside the four corners of the rotating platform, the rotating platform can be embedded in the inside of the limiting claws, and the rotating platform is used for limiting the radial movement range.

[0008] In some embodiments, the mirror reflection mechanism comprises a mounting sheet, a positioning plate and a driving assembly, the mounting sheet is fixedly arranged on the upper surface of the rotating platform, a plurality of positioning holes are formed in the mounting sheet, at least two positioning plates are fixedly connected to the mounting sheet, and the driving assembly is arranged on the positioning plate.

[0009] In some embodiments, the driving assembly comprises a lead screw, a driving block, a micro motor, a connecting arm, a remote control motorized rotating shaft and a reflecting plate, the lead screw is rotatably connected to the two positioning plates at both ends, the driving block is arranged through the middle of the lead screw and is threadedly connected with the lead screw, the micro motor is arranged on one of the positioning plates, and the output end of the micro motor is drivingly connected with the lead screw for driving the rotation of the lead screw. The lower ends of at least two connecting arms are symmetrically arranged on the upper surface of the driving block. The remote control motorized rotating shaft is rotatably connected between the two connecting arms, and the rear side of the reflecting plate is fixedly connected to the outside of the remote control motorized rotating shaft through a mounting bracket.

[0010] In some embodiments, the mirror reflection mechanism further comprises an angle sensor coaxially connected with the remote control motorized rotating shaft, and the angle sensor is configured to detect the actual pitch angle of the reflecting plate in real time.

[0011] In some embodiments, the control module is configured to: control the rotating driving mechanism according to the azimuth angle data to track the azimuth angle of the sun; control the mirror reflection mechanism to adjust the pitch angle of the reflecting plate according to the elevation angle data and the actual irradiance value fed back by the standard irradiance sensor, so that the sunlight is projected to the surface of the vehicle body at a preset standard irradiance value.

[0012] In some embodiments, a plurality of air supply mechanisms are arranged on the rotating platform, and the air supply mechanisms are used to supply air to the reflecting plate to reduce the temperature and blow off dust.

[0013] In some embodiments, the angle sensor is used to feed back the actual pitch angle of the reflecting plate in real time and transmit data to the control module, and the control module adjusts the operating state of the micro motor according to the actual pitch angle fed back by the angle sensor.

[0014] The application also provides a sunlight self-following reflection control method, comprising the following steps: Step one, after parking the vehicle to be measured in the center positioning area of the rotating platform, starting the online measuring instrument to obtain the azimuth angle and elevation angle of the local sun in real time at a first sampling frequency; Step two, the control module generates a first control signal according to the azimuth angle to drive the rotating platform to rotate in the horizontal plane until the vehicle head direction is aligned with the azimuth angle of the sun. Step three, the control module obtains the height angle based on the online measuring instrument, and calculates the theoretical target pitch angle of the reflection plate according to the reflection law of light; then, the control module takes the theoretical target pitch angle as an initial setting value, and adjusts the control signal of the driving micro motor in real time through the PID algorithm according to the deviation between the actual irradiance value fed back by the standard irradiance sensor and the preset standard value, dynamically corrects the actual pitch angle of the reflection plate, and forms a closed-loop control with constant irradiance as the final target. Step four, repeat steps one to three during the entire exposure period until the preset weather resistance test time is reached.

[0015] Through the above technical scheme, the solar light self-following reflection system and the control method provided by the application utilize the cooperative work of the rotary driving mechanism and the mirror reflection mechanism to track the changes of the azimuth angle and the height angle of the sun in real time. The rotary platform realizes 360° rotation in the horizontal plane through the driving unit, so that the vehicle head direction is always aligned with the azimuth angle of the sun. The mirror reflection mechanism adjusts the pitch angle of the reflection plate through the micro motor and the lead screw, so as to ensure that the sunlight is projected to the surface of the vehicle body at the preset standard irradiance value. This design eliminates the cosine projection error caused by the change of the height angle of the sun and the difference between regions, and significantly improves the comparability and repeatability of the paint weather resistance test results. In addition, the setting of the air supply mechanism effectively reduces the surface temperature of the reflection plate and reduces the dust adhesion, thereby maintaining the long-term stability of the reflection plate.

[0016] It should be understood that both the foregoing general description and the following detailed description are intended for purposes of illustration and description, and are not necessarily limiting of the present disclosure. The drawings in the accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate the subject matter of the present disclosure. Also, the description and drawings serve to explain the principles of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present disclosure, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application.

[0018] Figure 1 It is a first kind of three-dimensional structure schematic diagram of the embodiment of the present disclosure; Figure 2 It is a second kind of three-dimensional structure schematic diagram of the embodiment of the present disclosure; Figure 3 It is a three-dimensional structure schematic diagram of the system embedded in the ground in the embodiment of the present disclosure; Figure 4 Fig. 6 is a perspective view of a mirror reflection mechanism in an embodiment of the present disclosure; Figure 5 Fig. 7 is a partial perspective view of a mirror reflection mechanism in an embodiment of the present disclosure; Figure 6 Fig. 8 is a schematic view of light irradiation of a reflecting plate in an embodiment of the present disclosure; Figure 7 Fig. 9 is a schematic view of an angle of light irradiation of a reflecting plate in an embodiment of the present disclosure; Fig. 1 is a schematic view of a buried support; Fig. 2 is a schematic view of a rotating driving mechanism; Fig. 3 is a schematic view of a rotating platform; Fig. 4 is a schematic view of a mirror reflection mechanism; Fig. 5 is a schematic view of a reflecting plate; Fig. 6 is a schematic view of a blowing mechanism; and Fig. 7 is a schematic view of an online measuring instrument. DETAILED DESCRIPTION

[0019] In order to make the technical solutions and advantages of the embodiments of the present application clearer, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0020] The present application provides a sunlight self-following reflection system and a control method, which are described below in combination with the accompanying drawings. Figure 1 to the accompanying drawings Figure 7 The specific embodiments of the present application are described in detail. As Figure 1 and Figure 2The figure shows the overall structure of the present invention. A self-following sunlight reflection system includes an underground support 1, a rotary drive mechanism 2, a rotating platform 3, and a mirror reflection mechanism 4. The underground support 1, serving as the support base for the entire system, is fixed below the ground and extends upward. The rotary drive mechanism 2 is mounted on the underground support 1. The rotating platform 3 is provided with a protective steel frame. The rotating platform 3 is connected to the underground support 1 via the rotary drive mechanism 2. The mirror reflection mechanism 4 is symmetrically arranged on both sides of the rotating platform 3 and toward the rear of the vehicle. The underground support 1 is used to bear the weight of the entire system and ensure its stability. The rotary drive mechanism 2 can drive the rotating platform 3 to rotate 360 ​​degrees in the horizontal plane. The mirror reflection mechanism 4 is used to project sunlight onto the vehicle body surface at a preset standard irradiance value. The rotating platform 3 is also provided with at least one online measuring instrument 7, which acquires the azimuth and altitude data of the sun in real time. A standard irradiance sensor is also provided on the rotating platform 3. The standard irradiance sensor is positioned in a target illumination area near the surface of the vehicle body to be measured, and is used to measure the actual irradiance value of the reflected light in that area in real time. The rotating platform 3 is also provided with a control module, which is electrically connected to the rotating drive mechanism 2, the mirror reflection mechanism 4, the online measuring instrument 7, and the standard irradiance sensor. The control module is configured to: control the rotating drive mechanism 2 based on the azimuth data to track the azimuth of the sun; and control the mirror reflection mechanism 4 to adjust the pitch angle of the reflector based on the altitude data and the actual irradiance value fed back by the standard irradiance sensor, so as to project sunlight onto the vehicle body surface at a preset standard irradiance value.

[0021] like Figure 2 The figure shows a detailed view of the rotary drive mechanism 2, which includes a drive unit 201, a rotating disk 202, a support frame 203, a connecting frame 205, a guide wheel 206, and a limiting claw 207. The support frame 203 is fixedly connected to the middle of the upper end of the buried bracket 1, and the drive unit 201 is installed on the lower surface of the support frame 203. The output end of the drive unit 201 is connected to the lower surface of the rotating disk 202 through a drive shaft. A rotating platform 3 is fixedly connected above the rotating disk 202. A plurality of connecting frames 205 are evenly distributed along the circumference of the rotating disk 202, and the lower ends of the connecting frames 205 are vertically fixed to the upper surface of the buried bracket 1. The guide wheel 206 is rotatably connected to the upper end of the connecting frame 205. The upper ends of all the guide wheels 206 are jointly attached to the outer periphery of the lower surface of the rotating disk 202, providing stable rolling support for the rotating disk 202 to reduce the friction resistance during its rotation. A plurality of limit claws 207 are provided at the four corners of the outer side of the rotating platform 3, and the rotating platform 3 can be embedded in the inner side of the limit claws 207. The lower end of the limit claws 207 is fixedly connected to the outer side of the buried bracket 1 to limit the radial movement range of the rotating platform 3. Figure 3 Shown is a schematic diagram of the three-dimensional structure of the present invention after being pre-buried in the ground.

[0022] As Figure 4 and Figure 5 As shown in FIG. 4, the mirror reflection mechanism 4 includes a mounting sheet 401, a positioning plate 403, and a driving assembly. The mounting sheet 401 is fixedly arranged on the upper surface of the rotating platform 3, and a plurality of positioning holes 402 are formed in the mounting sheet 401 for fixing the mounting sheet 401 to the rotating platform 3 by bolts or other fasteners. The positioning plate 403 is fixedly connected to the mounting sheet 401, and the driving assembly is arranged on the positioning plate 403. The driving assembly includes a lead screw 404, a driving block 405, a micro motor 406, a connecting arm 407, a remote control motorized rotating shaft 408, and a reflecting plate 409. The lead screw 404 is rotatably connected to the two positioning plates 403 at both ends, the driving block 405 is arranged in the middle of the lead screw 404 and is threadedly connected to the lead screw 404, the micro motor 406 is arranged on one of the positioning plates 403, and the output end of the micro motor 406 is in transmission connection with the lead screw 404. The lower ends of at least two connecting arms 407 are symmetrically arranged on the upper surface of the driving block 405. The remote control motorized rotating shaft 408 is rotatably connected between the two connecting arms 407, and the reflecting plate 409 is fixedly connected to the outer side of the remote control motorized rotating shaft 408 through a mounting bracket. One end of the mounting bracket away from the reflecting plate 409 is fixedly connected to the remote control motorized rotating shaft 408. The reflecting plate 409 is specifically a 6000 mm x 2000 mm high-reflectivity (≥93%) aluminum mirror.

[0023] In addition, the mirror reflection mechanism 4 further includes an angle sensor 411 coaxially connected with the remote control motorized rotating shaft 408, which is configured to detect the actual pitch angle of the reflecting plate 409 in real time.

[0024] A plurality of air supply mechanisms 6 are arranged on the rotating platform 3, which are used to supply air to the reflecting plate 409 to reduce the temperature and blow off dust.

[0025] The angle sensor 411 detects the actual pitch angle of the reflecting plate 409 in real time and outputs a corresponding electrical signal to the control module to form a closed-loop control. The control module is built-in with a three-dimensional digital model of the surface to be measured of the automobile, which contains the coordinates and surface normal vectors of each key test point of the vehicle body. The control module generates a first control signal and a second control signal according to the data collected by the online measuring instrument 7, and the driving unit 201 drives the rotating disc 202 to rotate through the driving shaft, so that the rotating platform 3 rotates in the horizontal plane until the vehicle head direction is aligned with the solar azimuth angle. The micro motor 406 drives the driving block 405 to slowly displace along a straight line through the lead screw 404, and at the same time, the remote control motorized rotating shaft 408 is started to slightly rotate the reflecting plate 409, so that the reflecting plate 409 pitches around the remote control motorized rotating shaft 408 until the difference between the actual pitch angle of the reflecting plate 409 and the target angle is not more than ±0.5°. The angle sensor 411 feeds back the actual pitch angle of the reflecting plate 409 in real time and transmits the data to the control module.

[0026] As Figure 6 and Figure 7 shown, in operation, the online measurement instrument 7 continuously outputs the local solar azimuth angle A and elevation angle B at a frequency of 1 Hz to 10 Hz, the control module compares A with the current azimuth angle of the platform to generate a first control signal; the servo drive unit 201 drives the rotating platform 3 to rotate horizontally through the rotating disc 202 and the connecting frame 205, so that the vehicle head direction is real-time aligned with the solar azimuth angle A, and the azimuth deviation is eliminated, the control module calculates the accurate target pitch angle θ of the reflecting plate 409 in real time according to the reflection law of light (i.e. the reflected light, the incident light and the normal are coplanar, and the reflection angle is equal to the incident angle), so that the reflected light and the surface normal of the target point are coincident (or parallel), and generates a second control signal; each micro motor 406 drives the drive lead screw 404 to rotate, and the drive block 405 linearly displaces, and the connecting arm 407 pushes and pulls the reflecting plate 409 to pitch 408 until the actual pitch angle and the target angle difference is not more than plus or minus 0.5 degrees, the angle sensor 411 real-time indicates the actual angle of the reflecting plate 409, and feeds back to the control module, forming a PID closed loop, to ensure that the reflected light spot is always projected on the vehicle body surface according to the preset angle, and the two sides and the tail three 6000 mm x 2000 mm high reflectivity (≥93%) aluminum mirrors reflect the sunlight to the vehicle body with AM1.5 global standard spectrum, and the cosine projection error is completely compensated. When driving the micro motor, the control module not only depends on the calculated target pitch angle, but also compares the actual irradiance value fed back by the standard irradiance sensor with the preset standard value, and adjusts the pitch angle of the reflecting plate through the PID algorithm to compensate for the irradiance fluctuation caused by atmospheric condition changes or reflectivity attenuation, and finally realizes the constant standard irradiance closed loop control. The air supply mechanism 6 continuously supplies air to the reflecting plate 409, reduces the mirror surface temperature rise and blows off dust, maintains the long-term stability of the reflectivity, and through real-time tracking of the solar azimuth and elevation, compensates for the cosine projection change, so that the front, side and tail surfaces of the vehicle obtain constant standard solar irradiance under outdoor natural conditions, and fundamentally solves the problem that the test data of the traditional exposure field is not comparable due to the change of the solar elevation angle.

[0027] In order to better enable the relevant persons in the technical field to fully understand and implement the present application, the specific implementation principles of the present application are further supplemented as follows in combination with a specific application scenario.

[0028] First, the test car is parked and fixed in the center positioning area of the rotating platform 3, ensuring that the front side surface of the car body is aligned with the central axis of the rotating platform 3. Through the stable support provided by the buried support 1, the entire system is firmly fixed to the ground, avoiding shaking or deviation caused by external wind or other environmental factors. Then start the online measuring instrument 7, which acquires real-time azimuth and elevation angle data of the local sun at a first sampling frequency of 1 Hz to 10 Hz, and transmits the collected data to the control module. The selection of this frequency needs to balance the tracking accuracy and system calculation load. In general, to ensure smooth tracking of the apparent motion of the sun, a frequency of not less than 1 Hz is preferred; in scenarios with higher dynamic response requirements, a higher frequency, such as 5 Hz or 10 Hz, can be selected.

[0029] The control module generates a first control signal based on the sun azimuth data, and the driving unit 201 receives the signal and drives the rotating disc 202 to rotate through the driving shaft. The rotation of the rotating disc 202 further drives the rotating platform 3 to rotate 360° in the horizontal plane until the car head direction is aligned with the sun azimuth. In this process, the guide wheel 206 rolls along the lower surface of the rotating disc 202 to reduce frictional resistance, and the limiting pawl 207 limits the radial movement range of the rotating platform 3 to ensure its smooth operation. This design can align the car head with the sun azimuth (eliminate azimuth deviation) through the rotating platform 3, and then adjust the elevation angle through the reflecting plate 409, finally realize the coincidence of reflected light and the normal line of the car body surface, as shown in Figure 6 and Figure 7 .

[0030] Then, the control module generates a second control signal based on the sun elevation angle data, and the micro motor 406 receives the signal and drives the driving block 405 to move linearly through the lead screw 404. At the same time, the remote control electric rotating shaft 408 is started to rotate to make the reflecting plate 409 pitch until the actual pitch angle of the reflecting plate 409 and the target angle difference is not more than ±0.5°. In this process, the angle sensor 411 cooperates to form a closed-loop control mechanism, which feedbacks the actual pitch angle of the reflecting plate 409 in real time and transmits the data to the control module. The control module adjusts the operating state of the micro motor 406 according to the feedback data, thereby realizing accurate control of the pitch angle of the reflecting plate 409. This closed-loop control method significantly improves the accuracy of the angle adjustment of the reflecting plate 409, ensuring that the sunlight is projected onto the car body surface at a preset standard irradiance value.

[0031] During the entire exposure period, as shown in Figure 6 , O is the origin of the reflecting plate 409, OA is the reflected light of the sun, OB is the incident light of the sun, and OC is the angle bisector of angle AOB. At this time, the plane perpendicular to OC is the plane of the reflecting plate 409: , , ; ; ; ; As shown in Figure 7 , assuming the initial direction (median line) of the reflecting plate 409 is along the OX direction, then to turn to the OC direction, it must first rotate along the OZ axis by an angle A, and then rotate along the OY axis by an angle B, the calculation formula of the AB angle is: ; .

[0032] In summary, the rotating platform 3 is linked with the online measuring instrument 7, real-time aligns the vehicle head direction to the sun azimuth, and synchronously adjusts the pitch angle of the reflecting plate 409, completely compensates the cosine projection difference caused by the change of the sun elevation angle in different regions or at different times, so that the vehicle body surface always obtains a unified standard irradiance, thereby eliminating the test error caused by regional difference and seasonal difference, and significantly improving the comparability and repeatability of the paint weather resistance test results.

[0033] During this period, the air supply mechanism 6 continuously supplies air to the back side of the reflecting plate 409, reduces the surface temperature of the reflecting plate 409 and blows off the dust. This design effectively avoids the problem of temperature rise of the reflecting plate 409 due to long-term exposure to sunlight, and reduces the influence of dust adhesion on reflectivity, thereby maintaining the high reflectivity of the reflecting plate 409. In addition, the online measuring instrument 7 continuously monitors the change of the sun position at a first sampling frequency of 1Hz-10Hz, and updates the data to the control module in real time. The control module repeats the above steps according to the latest sun azimuth and elevation angle information, so that the front side, both sides and the tail of the vehicle body surface continuously receive constant standard solar irradiance until the preset weather resistance test time is reached.

[0034] Through the above steps, the solar light self-following reflection system and control method provided by the present application can realize constant standard irradiance projection for paint weather resistance test of automobile body under natural climate conditions. The rotating drive mechanism 2 and the mirror reflection mechanism 4 work cooperatively, real-time track the change of the sun azimuth and elevation angle, and eliminate the cosine projection error caused by the change of the sun elevation angle and regional difference. At the same time, the setting of the air supply mechanism 6 effectively reduces the surface temperature of the reflecting plate 409 and reduces the dust adhesion, thereby maintaining the long-term stability of the reflecting plate 409, and significantly improving the comparability and repeatability of the paint weather resistance test results.

[0035] The contents not described in detail in the specification are all the prior art known by the person skilled in the art, and the model parameters of the electric appliances are not specifically limited, and the conventional equipment can be used. In the technical solution, the electric appliance control elements not mentioned belong to the prior art, and therefore are not shown in the drawings, and will not be described here.

[0036] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0037] In the description of the present disclosure, it should be explained that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present disclosure, it should be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For the person skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0039] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0040] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A sunlight self-following reflection system, characterized in that: include: An underground bracket (1) is fixed below the ground and extends upwards, and is used to bear the weight of the entire system and ensure its stability; A rotary drive mechanism (2) is mounted on the underground bracket (1); A rotating platform (3) is connected to the buried bracket (1) via the rotating drive mechanism (2), the rotating platform (3) is used to carry the vehicle to be tested, and the rotating drive mechanism (2) is used to drive the rotating platform (3) to rotate 360° in a horizontal plane; At least one mirror reflection mechanism (4) is arranged on the rotating platform (3), and the mirror reflection mechanism (4) is used to project sunlight onto the surface of the vehicle body; The rotating platform (3) is also provided with: At least one online measuring instrument (7), wherein the online measuring instrument (7) is configured to obtain azimuth and altitude data of the sun in real time; The standard irradiance sensor is set in the target irradiation area near the surface of the vehicle body to be tested, and is used to measure the actual irradiance value of the reflected light in the area in real time; as well as The control module is electrically connected to the rotation drive mechanism (2), the mirror reflection mechanism (4), the online measuring instrument (7), and the standard irradiance sensor.

2. The sunlight self-following reflection system according to claim 1, characterized in that: The rotary drive mechanism (2) comprises a drive unit (201), a rotating disk (202) and a support frame (203); the support frame (203) is fixedly connected to the middle portion of the upper end of the buried bracket (1); the drive unit (201) is mounted on the lower surface of the support frame (203); the output end of the drive unit (201) is connected to the lower surface of the rotating disk (202) via a drive shaft; and the upper portion of the rotating disk (202) is fixedly connected to the rotating platform (3).

3. The sunlight self-following reflection system according to claim 2, characterized in that: A plurality of connecting frames (205) are evenly distributed along the circumference of the rotating disk (202), the lower ends of the connecting frames (205) are vertically fixedly connected to the upper surface of the buried bracket (1), the upper end of each connecting frame (205) is rotatably connected to a guide wheel (206), the upper ends of all the guide wheels (206) are jointly attached to the outer periphery of the lower surface of the rotating disk (202), providing stable rolling support for the rotating disk (202) to reduce the friction resistance during its rotation, the buried bracket (1) is fixedly connected to a plurality of limiting claws (207), and the upper ends of the plurality of limiting claws (207) are all arranged at the four outer corners of the rotating platform (3), and the rotating platform (3) can be embedded in the inner side of the limiting claws (207).

4. The sunlight self-following reflection system according to claim 1, characterized in that: The mirror reflection mechanism (4) comprises a mounting plate (401), a positioning plate (403) and a driving assembly, wherein the mounting plate (401) is fixedly arranged on the upper surface of the rotating platform (3), a plurality of positioning holes (402) are provided on the mounting plate (401), at least two positioning plates (403) are fixedly connected to the mounting plate (401), and the driving assembly is arranged on the positioning plate (403).

5. The sunlight self-following reflection system according to claim 4, characterized in that: The driving assembly includes a lead screw (404), a driving block (405), a micro motor (406), a connecting arm (407), a remote-controlled electric rotating shaft (408) and a reflecting plate (409), wherein both ends of the lead screw (404) are rotatably connected to the two positioning plates (403), the driving block (405) is arranged through the middle of the lead screw (404) and is threadedly connected to the lead screw (404), the micro motor (406) is arranged on one of the positioning plates (403), and the output end of the micro motor (406) is transmission-connected to the lead screw (404), the lower ends of at least two connecting arms (407) are symmetrically arranged on the upper surface of the driving block (405), the remote-controlled electric rotating shaft (408) is rotatably connected between the two connecting arms (407), and the rear side of the reflecting plate (409) is fixedly connected to the outer side of the remote-controlled electric rotating shaft (408) through a mounting bracket.

6. The sunlight self-following reflection system according to claim 5, characterized in that: The mirror reflection mechanism (4) further comprises an angle sensor (411) coaxially connected to the remote-controlled electric rotating shaft (408), wherein the angle sensor (411) is configured to detect the actual pitch angle of the reflection plate (409) in real time.

7. The sunlight self-following reflection system according to claim 1, characterized in that: The control module is configured to: Controlling the rotation drive mechanism (2) according to the azimuth angle data to track the solar azimuth angle; According to the altitude angle data and the actual irradiance value fed back by the standard irradiance sensor, the mirror reflection mechanism (4) is controlled to adjust the pitch angle of the reflection plate so as to project sunlight onto the vehicle body surface at a preset standard irradiance value.

8. The sunlight self-following reflection system according to claim 1, characterized in that: A plurality of air supply mechanisms (6) are provided on the rotating platform (3), and the air supply mechanisms (6) are used to supply air to the reflecting plate (409) to reduce the temperature and blow away dust.

9. The sunlight self-following reflection system according to claim 6, characterized in that: The angle sensor (411) is used to provide real-time feedback of the actual pitch angle of the reflector (409) and transmit the data to the control module, and the control module adjusts the operating state of the micro motor (406) according to the actual pitch angle fed back by the angle sensor (411).

10. A control method for a sunlight self-following reflection system according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: After parking the vehicle to be tested in the central positioning area of ​​the rotating platform, start the online measuring instrument to obtain the local solar azimuth and altitude angle in real time at a first sampling frequency; Step 2: The control module generates a first control signal according to the azimuth angle to drive the rotating platform to rotate in the horizontal plane until the front direction of the vehicle is aligned with the solar azimuth angle; Step 3: The control module calculates the theoretical target pitch angle of the reflector based on the altitude angle obtained by the online measuring instrument and the law of reflection of light; Subsequently, the control module uses this theoretical target pitch angle as the initial setting value. Based on the deviation between the actual irradiance value fed back by the standard irradiance sensor and the preset standard value, the PID algorithm is used to fine-tune the control signal driving the micro-motor in real time, dynamically correcting the actual pitch angle of the reflector, thus forming a closed-loop control with constant irradiance as the ultimate goal. Step 4: Repeat steps 1 to 3 throughout the exposure cycle until the preset weathering test time is reached.

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