A coating reflectance testing device and a testing method thereof

Abstract

The present invention discloses a coating reflectance test device and method, which defines a test space inside a test box that can surround a light source, a test board bracket and a test instrument, and a matte material layer is provided on the wall of the test space, so that the test space is not affected by the external environment, and the light source simulates the cloudy natural light conditions, which has the following advantages: 1. Only a test board with a tested coating on the surface needs to be prepared, and there is no need to process the environment (for example, there is no need to coat the tested coating on the wall of the test space), and it can be used repeatedly, thereby greatly reducing the test cycle and test cost; 2. After the test space is closed, it is not affected by the external environment, and the light source can accurately and stably simulate the cloudy natural light that meets the conditions, thereby ensuring the test accuracy. 3. The entire test device can be made relatively small and easy to move, and the time and place of use are not restricted, so the purpose of testing can be achieved anytime and anywhere.

Description

Technical Field

[0001] The invention relates to the field of detection equipment, and in particular to a coating reflectance testing device and a testing method thereof. Background Art

[0002] Reflectance is the percentage of diffuse light energy reflected from a material. Generally speaking, as you increase the value (V) of a material in HSV, the material will reflect more diffuse light, while reducing the opacity of a material will reduce its reflectance.

[0003] Based on different usage scenarios, there are different requirements for the reflectance of materials. Generally speaking, the reflectance needs to be determined through testing. Taking building coatings as an example, the existing building coating reflectance test mainly refers to the method of measuring the reflectance of indoor surfaces with test instruments in 9.2.2 of GB / T 5699-2017. The steps of this test method in testing the reflectance of coatings are as follows: ① Painting: The paint to be tested needs to be painted on the wall of a closed room, twice, for a total of two days; ② Drying: Wait for the paint to dry for seven days; ③ Testing: Install a multi-probe test device rack in the room, and then use a reflectance tester to test, and finally complete the test work. This test method has the following disadvantages: 1. After painting, you need to wait for a long time until the coating dries naturally, which takes a long time; 2. The light source during the test requires cloudy natural light, and the environmental conditions are demanding; 3. During the test, personnel need to adjust the probe in the room, which is easy to interfere with the final test results. 4. Each test requires a lot of manpower and material resources, and the test cycle is long and the test cost is high. Summary of the invention

[0004] The main purpose of the present invention is to provide a coating reflectance testing device and a testing method thereof, aiming to shorten the testing cycle, reduce the testing difficulty and cost, and improve the testing accuracy.

[0005] To achieve the above object, the present invention provides a coating reflectance testing device, comprising:

[0006] A test box, wherein an openable and closable test space is defined in the test box, and a matte material layer is provided on the wall surface of the test space;

[0007] A light source, which is disposed in the test box and is used to project scattered light into the test space;

[0008] a test board bracket, the test board bracket being arranged in the test space and used for placing a test board; and

[0009] A testing instrument is arranged in the testing space and is used to detect the reflectance of the coating on the testing plate.

[0010] To achieve the above object, the present invention also provides a coating reflectance testing method, comprising the following steps:

[0011] S1. Coating the coating to be tested on the surface of the test plate, and installing the coating to be tested on the test plate bracket after it is dried;

[0012] S2, closing the test space and making the light source emit light at a certain temperature and humidity to simulate cloudy natural light in the test space;

[0013] S3. Test the coating of the test board using a testing instrument and obtain the reflectance of the coating.

[0014] The technical solution of the present invention defines a test space inside the test box that can surround the light source, the test board bracket and the test instrument, and a matte material layer is provided on the wall of the test space, so that the test space is not affected by the external environment, and the light source simulates the cloudy natural light (GB / T 20148) condition, which has the following advantages: 1. Only the test board with the coating to be tested on the surface needs to be prepared, and there is no need to process the environment (for example, there is no need to coat the coating to be tested on the wall of the test space), and it can be used repeatedly, thereby greatly reducing the test cycle and test cost; 2. After the test space is closed, it is not affected by the external environment, and the light source can accurately and stably simulate the cloudy natural light that meets the (GB / T 20148) condition, thereby ensuring the test accuracy. 3. The entire test device can be made relatively small and easy to move, and the time and place of use are not restricted, so the purpose of testing can be achieved anytime and anywhere. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the present invention in a state where the test space is closed;

[0016] Figure 2 is a cross-sectional view of the present invention in a state where the test space is closed;

[0017] Figure 3 It is a three-dimensional schematic diagram of the present invention in a state where the test space is opened;

[0018] Figure 4 It is a top view of the present invention in a state where the test space is opened. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the present invention, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] The invention provides a coating reflectance testing device.

[0023] In the embodiment of the present invention, Figures 1 to 4 As shown, the coating reflectance test device includes a test box 1, a light source 2, a test board bracket 3 and a test instrument 4. The test box 1 defines an openable and closable test space, and the wall of the test space is provided with a matte material layer, which is preferably coated with a black matte paint, and its absorbance is preferably greater than 90%; the light source 2 is provided in the test box 1, and is used to project scattered light into the test space; the test board bracket 3 is provided in the test space, and is used to place the test board; the test instrument 4 generally adopts a color illuminance meter, which is provided in the test space, and is used to detect the coating reflectance on the test board.

[0024] Since the present invention defines a test space that can surround the light source, the test board bracket and the test instrument inside the test box, and a matte material layer is provided on the wall of the test space, so that the test space is not affected by the external environment, and the light source simulates the cloudy natural light (GB / T 20148) condition, it has the following advantages: 1. It only needs to prepare a test board with a coating to be tested on the surface, and there is no need to process the environment (for example, there is no need to coat the coating to be tested on the wall of the test space), and it can be used repeatedly, thereby greatly reducing the test cycle and test cost; 2. After the test space is closed, it is not affected by the external environment, and the light source can accurately and stably simulate the cloudy natural light that meets the (GB / T 20148) condition, and the temperature can be guaranteed to be stable, thereby ensuring the test accuracy. 3. The entire test device can be made relatively small and easy to move, and the time and place of use are not restricted, so the purpose of testing can be achieved anytime and anywhere.

[0025] Specifically, the test board bracket 3 is arranged on one side of the test space in the length direction, and the light source 2 is arranged on the other side of the test space in the length direction and opposite to the test board bracket 3 (the test board is preferably vertically hung on the test board bracket 3 and opposite to the light source). A window structure 5 is arranged near the light source in the test space to divide the test space into two areas in the length direction, and at least the middle area of ​​the window structure 5 is a translucent light-transmitting area. The light emitted by the light source can be uniformly projected onto the test board after passing through the translucent light-transmitting area, so that the total transmittance requirement of the window meets the value requirements in Appendix D of GB 50033. Specifically, the translucent light-transmitting area can be made of frosted glass or frosted acrylic board, preferably frosted glass, and the surface of the non-light-transmitting area is provided with a matte material layer.

[0026] It can be understood that the size of the translucent light-transmitting area should meet the requirements of the window-to-floor ratio for Category 5 areas in GB 50033.

[0027] It is understandable that the shape of the test box (1) can be implemented in various ways, such as a hollow cube, a rectangular parallelepiped, a semi-cylinder or a prism, preferably a rectangular parallelepiped.

[0028] Specifically, the test box 1 includes a bottom plate 11, an upper cover plate 12, a front plate 14, a rear plate, a left plate 15 and a right plate 16 arranged on the bottom plate 11. The bottom plate 11, the rear plate, the front plate 14, the left plate 15 and the right plate 16 together form a box body with an open upper end. The upper cover plate 12 can be pivotally mounted on the top of the box body and can swing between the positions of closing the open upper end of the box body (i.e., closing the test space) and opening (i.e., opening the test space). In order to adjust and replace the light source and the maintenance of the internal device of the equipment before or during the test. Optionally, the test board bracket 3 can be arranged on the front plate, or at a position of the bottom plate close to the front plate. The bottom plate, the front plate, the upper cover plate, the left plate and the right plate can be made of opaque materials such as hard plates, stainless steel plates or tinplate plates to ensure the stability and opacity of the test box. The thickness can be 1mm to 20mm, which is based on the ability to ensure structural strength.

[0029] Specifically, the window structure 5 includes a frame 51 installed in the test space and a translucent window plate 52 detachably installed on the frame 51 , and the translucent window plate 52 forms the translucent light-transmitting area.

[0030] Specifically, the test space is provided with a support frame 41 between the translucent window plate 52 and the test board bracket 3, and the test instrument 4 is mounted on the support frame 41. The test space is also provided with a motion mechanism 6, and the support frame 41 is mounted on the motion part 62 of the motion mechanism 6. The support frame 41 can drive the test instrument 4 to move between the position close to the test board bracket 3 and the position far away from the test board bracket 3 under the drive of the motion part 62. The distance between the test board bracket and the support frame (that is, the test instrument and the test board) is adjusted to meet the setting of the window-to-floor ratio and effective lighting depth parameters for the five types of areas in the national standard.

[0031] Specifically, the moving mechanism 6 includes a guide rail 61, the moving part 62 slidably mounted on the guide rail 61, and a driving mechanism for driving the moving part 62 to slide along the guide rail 61, wherein the driving mechanism is a cylinder, and the piston rod of the cylinder is connected to the moving part; or the driving mechanism includes a screw pair connected to the moving part and a motor for driving the screw pair to rotate; or the driving mechanism includes a screw pair connected to the moving part and a manual rotating member 66 (such as a handwheel) installed outside the test box and connected to the screw pair, which can drive the moving part 62 to drive the test instrument 4 on the support frame 41 to move between a position close to the test board bracket 3 and a position away from the test board bracket 3.

[0032] Specifically, the motor or manual rotating member can be connected to the screw pair through a bevel gear set, and the cylinder and the motor can be controlled by a control device arranged outside the test box (such as arranged on the outer wall of the test box).

[0033] Specifically, the support frame 41 is provided with a vertically extending U-shaped groove 411, and the test instrument 4 can be detachably installed at different height positions of the U-shaped groove 411, and the installation height of the test instrument (4) can be adjusted according to needs (such as according to the height of the debugging board).

[0034] Specifically, the motion mechanism also includes a pendulum seat 63, and the screw pair and the guide rail are installed on the pendulum seat 63. The end of the pendulum seat 63 close to the test board bracket 3 can be pivotally installed on the base plate 11, and can drive the test instrument 4 on the support frame 41 to swing relative to each other, so as to adjust the angle between the test instrument and the test board according to the test requirements, thereby detecting the reflectance ratio of the coating surface of the test board at different angles.

[0035] Specifically, a latch 64 is provided at one end of the pendulum seat 63 away from the test board bracket 3, and a plurality of slots 65 adapted to the latch 64 are provided at intervals on the bottom plate 11 of the test box 1 corresponding to the swinging path of the latch 64. After the pendulum seat is swung to a predetermined angle, the latch is inserted into the corresponding slot, so that the pendulum seat can be positioned and the angle between the test instrument and the test board can be determined.

[0036] Specifically, the plurality of slots are preferably evenly spaced, and the angle formed by the centers of adjacent slots and the pivot center of the swing seat is 5 degrees.

[0037] The test board bracket 3 includes a plurality of vertical rods 31 which are arranged in a horizontal (i.e. left-right) interval in the test space (preferably arranged on the inner side of the front plate) and a plurality of cross rods 32 installed between the vertical rods 31. The cross rods 32 which are spaced apart in pairs are provided with relative slide grooves 321, and the upper and lower ends of the test board are inserted into the upper and lower relative slide grooves 321.

[0038] Furthermore, each vertical rod 31 is provided with a plurality of sockets 311 at intervals above and below, and the cross rod 32 is provided with insert blocks 322 at positions corresponding to the sockets 311 . The cross rod 32 is inserted between the vertical rods 31 through the cooperation of the sockets 311 and the insert blocks 322 .

[0039] Specifically, the frame 51 is in a U-shaped structure, and a card slot 53 with an open top is provided on its inner periphery. The translucent window panel 52 is inserted into the card 53 directly or through a light-blocking sheet (such as a fully light-blocking black plastic film) provided on the periphery of the translucent window panel. By inserting the light-blocking sheet provided on the periphery of the translucent window panel into the card slot, translucent window panels of different sizes can be selected according to test requirements to meet the requirements of the window-to-floor ratio of Category 5 areas in GB 50033, and the translucent window panel 52 can be quickly disassembled and assembled when the upper cover 12 is in a state where the test space is opened.

[0040] Specifically, the surfaces of the test instrument 4, the test board bracket 3, the motion mechanism 6, the frame 51 and the support frame 41 are also provided with a matte material layer. The matte material layer is preferably coated with black matte paint, and its absorbance is preferably greater than 90%, which can meet the test requirements.

[0041] Specifically, the support frame 41 is a controllable rotating support frame, or the test instrument 4 is installed on the support frame 41 through a rotating device, so that during the test process, the support frame or the rotating device can be controlled from the outside to adjust the angle of the test instrument without opening the test space for adjustment, thereby avoiding interference of the external environment to the test and ensuring the accuracy of the test.

[0042] Specifically, the left plate 15 and / or the right plate 16 respectively include a plate body and a door body 17. The plate body is provided with a passage 18 connecting the outside and the test space at a position corresponding to the test plate bracket 3. The door body 17 is movably connected to the plate body or the front plate 14 (for example, pivotally connected), and can move between the positions of opening and closing the passage 18. When the door body is in the position of opening the passage, the test board can be inserted into the slide groove through the passage to facilitate the installation of the test board. After installation, the door body can be driven to close the passage. A locking device is provided between the door body and the front plate or the plate body to lock the door body to the front plate or the plate body when the door body closes the passage to prevent abnormal movement of the door body. After the locking device is released from the door body, the door body can be driven to move. Optionally, the locking device can be a magnetic locking device. Since the magnetic locking device is a prior art, its specific structure and installation method are not described in detail.

[0043] Specifically, the light source 2 is a backlight module arranged at the rear side of the test space. The backlight module is preferably an LED backlight module, and the total illumination can be 0 to 800 lx (lux), meeting the relevant provisions of GB 50033 on the daylight factor. When the area of ​​the backlight module is large enough, the back plate can be formed by the back wall of the backlight module; of course, the backlight module and the back plate can also be two independent components. When they are two independent components, the backlight module can be installed on the back plate, or installed on the bottom plate close to the back plate.

[0044] Furthermore, a fan (not shown) is included for promoting air circulation between the test space and the outside to ensure the stability of the temperature in the test space. Specifically, a hole can be opened in the bottom plate and the fan can be installed.

[0045] Furthermore, it also includes a temperature sensor (not shown) for sensing the temperature of the test space. The temperature sensor and the fan are electrically connected to a control system. The control system can control the speed of the fan according to the temperature information detected by the temperature sensor to adjust the air circulation speed between the test space and the outside world.

[0046] After introducing the embodiment of the coating reflectance test device of the present invention, the embodiment of the coating reflectance test method of the present invention will be introduced next. The specific structure of the coating reflectance test device is shown in the above embodiment, and the repeated parts will not be repeated.

[0047] In the embodiment of the present invention, Figures 1 to 4 As shown, the coating reflectance test method comprises the following steps:

[0048] S1. Apply the coating to be tested on the surface of the test plate, and install it on the test plate bracket after the coating to be tested is dried.

[0049] Specifically, the coating can be dried completely by air drying, but in order to shorten the test cycle, after a certain period of air drying, it can be placed in a blower dryer at a predetermined temperature (e.g., 50°C) to be baked until completely dry, and then taken out and left until the coating temperature drops to room temperature.

[0050] S2. The test space is closed and the light source is made to emit light at a certain temperature and humidity to simulate the natural light on a cloudy day in the test space.

[0051] Specifically, the light source may be a backlight module, preferably an LED backlight module, which can accurately simulate the conditions of a completely cloudy day (GB / T20148) and provide a stable dry environment.

[0052] Before closing the test space, if the orientation of the pendulum seat is not the orientation required for the test, the process also includes swinging the pendulum seat to adjust the angle between the test instrument and the test board and adjusting the installation height of the test instrument along the U-shaped groove according to test requirements.

[0053] S3. Test the coating of the test board using a testing instrument and obtain the reflectance of the coating.

[0054] Specifically, when there are multiple test points on the test board coating (for example, multiple test boards are installed on the test board bracket), step S3 also includes a process of driving the support frame to move through a motion mechanism to adjust the distance between the test instrument on the support frame and the test board and / or adjusting the relative angle between the test instrument and the test board through the support frame (or rotating device).

[0055] It can be understood that the test points are selected in accordance with the point selection method for measuring indoor illuminance in 6.2 of GB / T5699-2017 "Daylighting Measurement Method", and the center position of the test board is generally selected.

[0056] Embodiment 1:

[0057] Example 1 The test method of the present invention is used, a color illuminance meter (CL-200A) is selected as the test instrument, Yashili scrubbing treasure interior wall latex paint is selected as the tested coating material, and 300lx LED is selected as the light source to simulate the side lighting of the V-class area of ​​civil buildings. Under the test environment of temperature of 10°C and humidity of 81%, the A4-sized test board 1, test board 2 and test board 3 coated with Yashili scrubbing treasure interior wall latex paint are tested successively. The test points are selected according to the indoor illumination point selection method of 6.2 in GB / T5699-2017 "Lighting Measurement Method", and finally the test data shown in Table 1 are obtained:

[0058] Table 1

[0059]

[0060]

[0061] Comparative Example 1:

[0062] Comparative Example 1 adopts the traditional national standard test method, in which a 5m*3m test room (Chengdu civil house) is selected as the test site, Yashili scrubbing treasure interior wall latex paint is selected as the tested coating material, and cloudy natural light is used as the light source. Under the test environment of temperature of 10°C and humidity of 81%, the wall of the test room coated with Yashili scrubbing treasure interior wall latex paint is tested. The test points are selected according to the indoor illumination point selection method of 6.2 in GB / T 5699-2017 "Lighting Measurement Method", and finally the test data shown in Table 2 are obtained:

[0063] Table 2

[0064]

[0065] Embodiment 2:

[0066] Example 2 was carried out using the test method of the present invention, a color illuminance meter (CL-200A) was selected as the test instrument, Nippon paint interior wall latex paint was selected as the coating material to be tested, and 300lx LED was selected as the light source to simulate the side lighting of Class IV areas of civil buildings. Under a test environment of temperature of 9°C and humidity of 65%, B5-sized test panels 1, 2, and 3 coated with Nippon paint interior wall latex paint were tested successively. The test points were selected according to the point selection method for measuring indoor illumination in 6.2 of GB / T5699-2017 "Daylighting Measurement Method", and finally the test data shown in Table 3 were obtained:

[0067] Table 3

[0068]

[0069]

[0070] Comparative Example 2:

[0071] Comparative Example 2 adopts the traditional national standard test method, in which a 6m*4m test room (Shanghai civil house) is selected as the test site, Nippon paint interior wall latex paint is selected as the coating material to be tested, and cloudy natural light is used as the light source. Under the test environment of temperature of 9°C and humidity of 65%, the wall of the test room coated with Nippon paint interior wall latex paint is tested. The test points are selected according to the indoor illumination point selection method of 6.2 in GB / T 5699-2017 "Lighting Measurement Method", and finally the test data shown in Table 4 are obtained:

[0072] Table 4

[0073]

[0074] Embodiment 3:

[0075] Example 3 is carried out using the test method of the present invention, a color illuminance meter (CL-200A) is selected as the test instrument, Oulong Youxiang bamboo charcoal interior wall latex paint is selected as the coating material to be tested, and 300lx LED is selected as the light source to simulate the side lighting of Class III areas of civil buildings. Under a test environment with a temperature of 12°C and a humidity of 40%, the B5-sized test board 1, test board 2 and test board 3 coated with Oulong Youxiang bamboo charcoal interior wall latex paint are tested successively. The test points are selected according to the indoor illumination point selection method of 6.2 in GB / T5699-2017 "Lighting Measurement Method", and finally the test data shown in Table 3 are obtained:

[0076] Table 5

[0077]

[0078] Comparative Example 3:

[0079] Comparative Example 3 adopts the traditional national standard test method, in which a 4m*2m test room (Zhengzhou civil house) is selected as the test site, and Oulong Youxiang bamboo charcoal interior wall latex paint is selected as the tested coating material. Sunny natural light is used as the light source. Under the test environment of temperature of 12°C and humidity of 40%, the wall of the test room coated with Oulong Youxiang bamboo charcoal interior wall latex paint is tested. The test points are selected according to the indoor illumination point selection method of 6.2 in GB / T 5699-2017 "Lighting Measurement Method", and finally the test data shown in Table 6 are obtained:

[0080] Table 6

[0081]

[0082]

[0083] By comparison, the above three embodiments show that the coating reflectance test method of the present invention has the following advantages over the traditional national standard test method:

[0084] (1) The test time is short. The test time can be reduced by more than 80%;

[0085] (2) The entire test device occupies a small area, is convenient for testing, and does not require a specific test room;

[0086] (3) The amount of paint consumed is small (in the three embodiments, the amount of paint used is about 0.1 kg). Compared with the traditional test method, the amount of paint used is reduced by more than 90%;

[0087] (4) It can be seen from the test results of Example 1, Example 2 and Example 3 and Comparative Examples 1, Comparative Example 2 and Comparative Example 3 that when the reflectance is tested using the test device of the present invention, the repeatability and reproducibility are very good, and the test data are accurate and stable; while when the traditional test method is used for testing, due to different environmental factors such as weather conditions and humidity, the test data can be corrected but the deviation is still large.

[0088] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A coating reflectance testing device, characterized in that: include: A test box (1), wherein an openable and closable test space is defined in the test box (1), and a matte material layer is provided on the wall surface of the test space; A light source (2), the light source (2) being arranged in the test box (1) and being used for projecting scattered light into the test space; A test board bracket (3), the test board bracket (3) being arranged in the test space and used for placing a test board; as well as A testing instrument (4), the testing instrument (4) being arranged in the testing space and used for detecting the reflectance of the coating on the testing plate; The test instrument (4) is mounted on a support frame (41), and the test space is further provided with a moving mechanism (6). The support frame (41) is mounted on a moving part (62) of the moving mechanism (6), and the support frame (41) can drive the test instrument (4) to move between a position close to the test board support (3) and a position far from the test board support (3) under the drive of the moving part (62); The moving mechanism (6) comprises a guide rail (61), the moving part (62) slidably mounted on the guide rail (61), and a driving mechanism for driving the moving part (62) to slide along the guide rail (61); the driving mechanism is a cylinder, and the piston rod of the cylinder is connected to the moving part; or the driving mechanism comprises a screw pair connected to the moving part and a motor for driving the screw pair to rotate; or the driving mechanism comprises a screw pair connected to the moving part and a manual rotating member (66) mounted outside the test box and connected to the screw pair; by controlling the extension and contraction of the piston rod of the cylinder or the rotation of the shaft of the motor, or manually rotating the manual rotating member (66), the moving part (62) can be driven to drive the test instrument (4) on the support frame (41) to move between a position close to the test board bracket (3) and a position away from the test board bracket (3); The motion mechanism also includes a swing seat (63), the lead screw pair and the guide rail are mounted on the swing seat (63), and one end of the swing seat (63) close to the test plate bracket (3) can be pivotally mounted on the base plate (11) and can drive the test instrument (4) on the support frame (41) to swing relatively.

2. A coating reflectance testing device as claimed in claim 1, characterized in that: The test board bracket (3) is arranged on one side of the test space in the length direction, the light source (2) is arranged on the other side of the test space in the length direction and is opposite to the test board bracket (3), and a window structure (5) is arranged at a position of the test space close to the light source to divide the test space into two areas in the length direction, and at least the middle area of ​​the window structure (5) is a semi-transparent light-transmitting area.

3. A coating reflectance testing device as claimed in claim 1, characterized in that: The test box (1) comprises a bottom plate (11), an upper cover plate (12), a rear plate, a front plate (14), a left plate (15) and a right plate (16) arranged on the bottom plate (11); the bottom plate (11), the rear plate, the front plate (14), the left plate (15) and the right plate (16) together form a box body with an open upper end; the upper cover plate (12) can be pivotally mounted on the top of the box body and can swing between a position of closing the open upper end of the box body and an open position.

4. A coating reflectance testing device as claimed in claim 2, characterized in that: The window structure (5) comprises a frame (51) installed in the test space and a translucent window plate (52) detachably installed on the frame (51), wherein the translucent window plate (52) forms the translucent light-transmitting area.

5. A coating reflectance testing device as claimed in claim 4, characterized in that: The test space is provided with a support frame (41) at a position between the translucent window plate (52) and the test plate bracket (3); the frame (51) is in a U-shaped structure, and a card slot (53) with an open top is provided on its inner periphery; the translucent window plate (52) is inserted into the card slot (53) directly or through a light blocking sheet provided on the periphery of the translucent window plate.

6. A coating reflectance testing device as claimed in claim 5, characterized in that: The support frame (41) is provided with a vertically extending U-shaped groove (411), and the testing instrument (4) can be detachably installed at different height positions of the U-shaped groove (411).

7. A coating reflectance testing device as claimed in claim 1, characterized in that: A latch (64) is provided at one end of the swing seat (63) away from the test board bracket (3), and a plurality of slots (65) adapted to the latch (64) are provided at intervals on the bottom plate (11) of the test box (1) corresponding to the swing path of the latch (64).

8. A coating reflectance testing device as claimed in claim 2, characterized in that: The test board bracket (3) comprises a plurality of vertical rods (31) arranged in a test space at a transverse interval and a plurality of cross rods (32) installed between the vertical rods (31); the cross rods (32) spaced in pairs are provided with opposite sliding grooves (321); the upper and lower ends of the test board are inserted into the opposite sliding grooves (321).

9. A coating reflectance testing device as claimed in claim 8, characterized in that: Each vertical rod (31) is provided with a plurality of sockets (311) at intervals above and below, and the cross rod (32) is provided with an insert block (322) at a position corresponding to the socket (311), and the cross rod (32) is inserted between the vertical rods (31) through the cooperation of the socket (311) and the insert block (322).

10. A coating reflectance testing device as claimed in claim 5, characterized in that: The surfaces of the testing instrument (4), the testing plate bracket (3), the moving mechanism (6), the frame (51) and the supporting frame (41) are also provided with a matte material layer.

11. A coating reflectance testing device as claimed in claim 5, characterized in that: The support frame (41) is a controllable rotatable support frame, or the testing instrument (4) is mounted on the support frame (41) via a rotating device.

12. A coating reflectance testing device as claimed in claim 3, characterized in that: The left plate (15) and / or the right plate (16) respectively include a plate body and a door body (17); the plate body is provided with a passage (18) connecting the outside and the test space at a position corresponding to the test plate bracket (3); the door body (17) is movably connected to the plate body or the front plate (14) and can move between positions to open and close the passage (18).

13. A coating reflectance testing device according to any one of claims 2 to 12, characterized in that: The light source (2) is a backlight module arranged at the rear side of the test space.

14. A coating reflectance testing device as claimed in claim 13, characterized in that: It also includes a fan for circulating air between the test space and the outside world.

15. A testing method using the coating reflectance testing device as claimed in any one of claims 1 to 14, characterized in that: The steps include: S1, coating the coating to be tested on the surface of the test plate, and installing the coating to be tested on the test plate bracket (3) after it is dried; S2, closing the test space and making the light source (2) emit light at a certain temperature and humidity to simulate cloudy natural light in the test space; S3. Testing the coating of the test plate using a testing instrument (4) and obtaining the reflectance of the coating.

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