Ultraviolet light intensity detection device

Abstract

The utility model discloses an ultraviolet light intensity detection device, which relates to the field of ultraviolet light detection equipment and comprises a shell, a light-transmitting window, an ultraviolet light intensity detection module and an automatic shading protection mechanism, the automatic shading protection mechanism comprises a guide rail assembly, a shading piece and a shading driving piece, one end of the shading driving piece is fixedly connected with the shading piece, and the other end is fixed to the inner wall of the shell. The sliding path of the anti-dazzling screen has a starting position and an ending position, the starting position avoids the working window, and the ending position shields the working window; the shading driving part is a two-way shape memory alloy telescopic part with the surface provided with a photothermal conversion coating, and the shading piece is driven by the shading driving part to advance to the final position or retreat to the starting position along the guide rail assembly. According to the utility model, through the automatic shading protection mechanism, the working window can be quickly shaded during strong light irradiation, and the problems of signal saturation, performance drift, device damage and the like are effectively prevented, so that measurement misalignment and device failure are effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of ultraviolet light detection equipment, specifically to an ultraviolet light intensity detection device. Background Technology

[0002] Ultraviolet (UV) radiation, as an electromagnetic wave with a specific wavelength range, has wide applications in various fields such as industrial production, medical and health care, environmental monitoring, and aerospace. For example, in the industrial curing field, UV radiation can be used for the rapid curing of materials such as coatings, inks, and adhesives, and its intensity stability directly determines the curing effect and product quality. In the medical and health field, whether the intensity of UV disinfection equipment meets the standards is crucial to the effectiveness of disinfection and sterilization, directly affecting public health and safety. In the environmental monitoring field, the detection of UV radiation intensity in the atmosphere is an important basis for assessing the degree of ozone layer depletion and formulating sun protection measures. Therefore, accurate detection of UV intensity is a key prerequisite for ensuring the reliable operation of related fields, making UV intensity detection devices an important type of detection equipment.

[0003] Existing ultraviolet (UV) light intensity detection devices typically include a housing, a light-transmitting window on the housing, and a UV light intensity detection module inside the housing. The working window of the UV light intensity detection module faces the light-transmitting window, allowing external UV light to enter the housing through the light-transmitting window and be received by the working window of the UV light intensity detection module, thereby realizing the acquisition and detection of UV light intensity signals. However, the working window of the UV light intensity detection module is usually provided by a photoelectric sensor sensitive to UV light. In environments with drastic changes in light intensity or strong light interference, if the sensor is exposed to strong light exceeding its measurement range for several minutes, problems such as signal saturation and performance drift may easily occur. In severe cases, it may even lead to permanent damage to the device, causing measurement inaccuracies or device failure. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides an ultraviolet light intensity detection device. Through an automatic light-shielding protection mechanism, the working window of the ultraviolet light intensity detection module can be quickly shielded when exposed to strong light, effectively preventing problems such as signal saturation, performance drift, and device damage, thereby effectively avoiding measurement inaccuracies and device failure.

[0005] This utility model provides an ultraviolet light intensity detection device, including a housing, a light-transmitting window disposed on the top of the housing, and an ultraviolet light intensity detection module disposed inside the housing. The ultraviolet light intensity detection module has a working window facing the light-transmitting window, and an automatic light-shielding protection mechanism is provided above the working window.

[0006] The automatic light-shielding protection mechanism includes a guide rail assembly fixed to the top of the housing, a light-shielding sheet slidably disposed in the guide rail assembly, and a light-shielding drive component arranged along the sliding direction of the light-shielding sheet. The light-shielding sheet and the light-shielding drive component are exposed in the light-transmitting window. One end of the light-shielding drive component is fixedly connected to the light-shielding sheet, and the other end is fixed to the inner wall of the housing. The sliding path of the light-shielding sheet has a starting position and an ending position. The starting position avoids the working window, and the ending position shields the working window.

[0007] The light-shielding drive is a two-way shape memory alloy telescopic component with a photothermal conversion coating on its surface. The light-shielding sheet is driven by the light-shielding drive to move forward along the guide rail assembly to the end position or back to the starting position.

[0008] Specifically, the two-way shape memory alloy telescopic component is a cylindrical spiral-shaped two-way shape memory alloy spring or a wave-shaped two-way shape memory alloy sheet.

[0009] Specifically, the automatic light-shielding protection mechanism also includes an isolation cover that covers the light-transmitting window from the inner top side of the housing;

[0010] The edge of the shield opening is fixedly connected to the side of the guide rail assembly away from the light-transmitting window. The light-shielding sheet slides within the coverage area of ​​the shield. The end of the light-shielding drive unit away from the light-shielding sheet extends out of the shield.

[0011] The isolation cover has a light-transmitting hole on the side away from the light-transmitting window, and the light-transmitting hole exposes the working window.

[0012] Specifically, the isolation cover has a limiting post formed inside, the top of the limiting post is flush with the upper surface of the light-shielding sheet, there is a first gap between the limiting post and the light-transmitting hole, and the vertical projection of the starting position falls within the first gap.

[0013] Specifically, a connecting post is formed on the side of the light-shielding sheet facing away from the light-transmitting window, and the connecting post and the limiting post are connected by an elastic rubber ring.

[0014] Specifically, the isolation cover has an internally formed enclosure frame that surrounds the light-transmitting opening, and the height of the enclosure frame is equal to the depth of the isolation cover.

[0015] Specifically, a limiting block is formed on the side of the light-shielding sheet facing away from the light-transmitting window, and the limiting block is located on the side of the light-shielding sheet close to the limiting post;

[0016] When the light-shielding sheet moves to the end position, one side of the limiting block abuts against the outer peripheral surface of the enclosure frame.

[0017] Specifically, the guide rail assembly includes two symmetrically arranged sub-guide rails, and the two sides of the light-shielding sheet are slidably disposed on the two sub-guide rails;

[0018] Each of the sub-guide rails is slidably connected to the light-shielding sheet based on a guide structure. Each of the guide structures includes a first guide surface and a second guide surface that are perpendicular to each other. The first guide surface is parallel to the inner top surface of the housing, and the second guide surface is parallel to the long side surface of the housing.

[0019] The light-shielding sheet has arc-shaped portions formed on both sides, the lower surface of any arc-shaped portion is a first plane, the upper surface of any arc-shaped portion is a second plane, and the end face of any arc-shaped portion is an outwardly convex arc surface.

[0020] Any of the first planes slides into contact with the corresponding first guide surface, any of the second planes slides into contact with the inner top surface of the housing, and any of the arc surfaces slides tangentially to the corresponding second guide surface.

[0021] Specifically, each of the sub-guide rails is provided with a lubrication groove along its own length direction, the lubrication groove is filled with grease, and the lubrication groove is located at the intersection of the first guide surface and the second guide surface.

[0022] Specifically, the ultraviolet light intensity detection module includes a circuit board and a gallium nitride ultraviolet sensor fixedly mounted on the circuit board. The circuit board is fixedly mounted on the inner bottom of the housing based on insulating pillars, and the working window is the light-receiving window of the gallium nitride ultraviolet sensor.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This invention relates to an ultraviolet (UV) light intensity detection device. An automatic light-shielding protection mechanism is installed above the working window of the UV light intensity detection module. This mechanism utilizes a photothermal conversion coating on the surface of the light-shielding drive component to absorb strong light radiation and generate heat. This heat directly drives a two-way shape memory alloy telescopic component to thermally expand, thereby causing the light-shielding plate to slide along the guide rail assembly to its endpoint position, quickly and automatically shielding the working window of the UV light intensity detection module. When the strong light disappears, the two-way shape memory alloy telescopic component naturally contracts as the temperature decreases, causing the light-shielding plate to return to its starting position and re-exposing the working window. This allows for rapid shielding of the UV light intensity detection module's working window during strong light exposure, significantly reducing the time the working window is exposed to harmful strong light. This effectively prevents signal saturation, performance drift, and device damage, thereby effectively avoiding measurement inaccuracies and device failure. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the first cross-sectional structure of the ultraviolet light intensity detection device in this embodiment of the present invention;

[0027] Figure 2 This is a first exploded structural diagram of the ultraviolet light intensity detection device in this embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the second cross-sectional structure of the ultraviolet light intensity detection device in this embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the second exploded structure of the ultraviolet light intensity detection device in this embodiment of the present invention;

[0030] Figure 5 This is a cross-sectional structural diagram of the light-shielding sheet when it is located at the starting position in an embodiment of this utility model;

[0031] Figure 6 This is a cross-sectional structural diagram of the light-shielding sheet when it is located at the end position in an embodiment of this utility model;

[0032] Figure 7 This is a schematic diagram of the cooperative structure of the sub-guide rail and the light-shielding sheet in an embodiment of this utility model;

[0033] Figure 8 This is a schematic diagram of the mating structure of the sub-guide rail, housing, and isolation cover in an embodiment of this utility model;

[0034] Figure 9 This is an exploded structural diagram of the ultraviolet light intensity detection device and the connecting frame in an embodiment of this utility model;

[0035] Figure 10 This is a schematic diagram of the combined structure of the ultraviolet light intensity detection device and the connecting frame in an embodiment of this utility model.

[0036] In the attached diagram, 100 is the housing; 101 is the first tenon; 110 is the main housing; 120 is the bottom cover; 130 is the snap-fit ​​rib; 200 is the light-transmitting window; 300 is the ultraviolet light intensity detection module; 310 is the circuit board; 320 is the gallium nitride ultraviolet sensor; 330 is the insulating post; 400 is the automatic light-shielding protection mechanism; 410 is the guide rail assembly; 411 is the first tenon; 412 is the second tenon; 420 is the light-shielding plate; 421 is the connecting post; 422 is the limiting block; and 423 is the limiting block. 430. Arc-shaped part; 500. Light-shielding drive component; 510. Isolation cover; 520. Light-transmitting through hole; 530. Limiting post; 540. Enclosure frame; 5516. Second tenon groove; 600. Elastic rubber ring; 700. Guide structure; 710. First guide surface; 720. Second guide surface; 730. Lubrication groove; 800. Connecting frame; 810. Main frame body; 811. Magnet; 812. Connecting through hole; 820. Main frame opening; 830. Snap-fit ​​frame; 900. Elastic washer. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0038] This invention provides an ultraviolet light intensity detection device. Figure 1 This shows a first cross-sectional structural diagram of the ultraviolet light intensity detection device in an embodiment of the present invention. Figure 2 The diagram shows a first exploded view of the ultraviolet light intensity detection device in an embodiment of the present invention. The ultraviolet light intensity detection device includes a housing 100, a light-transmitting window 200 disposed on the top of the housing 100, and an ultraviolet light intensity detection module 300 disposed inside the housing 100. The ultraviolet light intensity detection module 300 has a working window facing the light-transmitting window 200, and an automatic light-shielding protection mechanism 400 is provided above the working window.

[0039] The automatic light-shielding protection mechanism 400 includes a guide rail assembly 410 fixed to the top of the housing 100, a light-shielding sheet 420 slidably disposed in the guide rail assembly 410, and a light-shielding drive member 430 arranged along the sliding direction of the light-shielding sheet 420. The light-shielding sheet 420 and the light-shielding drive member 430 are exposed in the light-transmitting window 200. One end of the light-shielding drive member 430 is fixedly connected to the light-shielding sheet 420, and the other end is fixed to the inner wall of the housing 100. The sliding path of the light-shielding sheet 420 has a starting position and an ending position. The starting position avoids the working window, and the ending position shields the working window.

[0040] The light-shielding drive component 430 is a two-way shape memory alloy telescopic component with a photothermal conversion coating on its surface. The light-shielding sheet 420 is driven by the light-shielding drive component 430 to move forward along the guide rail assembly 410 to the end position or to return to the starting position.

[0041] The ultraviolet light intensity detection device of this invention features an automatic light-shielding protection mechanism 400 above the working window of the ultraviolet light intensity detection module 300. This mechanism utilizes a photothermal conversion coating on the surface of the light-shielding drive component 430 to absorb strong light radiation and generate heat. This heat directly drives a two-way shape memory alloy telescopic component to thermally expand, thereby causing the light-shielding plate 420 to slide along the guide rail assembly 410 to its endpoint position, quickly and automatically shielding the working window of the ultraviolet light intensity detection module 300. When the strong light disappears, the two-way shape memory alloy telescopic component naturally contracts as the temperature decreases, causing the light-shielding plate 420 to return to its starting position, re-exposing the working window. This allows for rapid shielding of the working window of the ultraviolet light intensity detection module 300 under strong light, significantly reducing the time the working window is exposed to harmful strong light. This effectively prevents signal saturation, performance drift, and device damage, thereby effectively avoiding measurement inaccuracies and device failure.

[0042] Moreover, the automatic shading protection mechanism 400 does not require an external power supply or circuit control, but only relies on the light-heat-deformation mechanism to respond, which is simple in structure and highly reliable.

[0043] In some specific embodiments, the light-transmitting window 200 is equipped with a quartz window, a magnesium fluoride window, a calcium fluoride window, or a sapphire window, etc., which can be prepared using mature materials and processes known in the art. It can not only efficiently transmit the ultraviolet light to be tested, but also block dust, moisture and other impurities from entering the housing 100, providing a stable and reliable optical channel and environmental barrier for the internal structure of the housing 100, thereby enhancing the overall durability and detection accuracy of the device.

[0044] In some specific embodiments, the photothermal conversion coating is a carbon black coating, or a graphene coating, or a black chromium coating, or a black nickel coating, etc., which can be prepared using mature materials and processes known in the art. These coatings have extremely high absorption rates over a wide spectral range, can efficiently convert light energy into heat energy, and are low in cost and have mature processes.

[0045] In some specific embodiments, the two-way shape memory alloy telescopic component is a cylindrical spiral-shaped two-way shape memory alloy spring or a wave-shaped two-way shape memory alloy spring, etc., which can be prepared using mature materials and processes known in the art. The two-way shape memory alloy can be a nickel-titanium based alloy or a copper-zinc-aluminum based alloy, etc. Unlike traditional (single-way) shape memory alloys, which can only recover their memory shape once upon heating, two-way shape memory alloys, after special training, can remember two stable shapes.

[0046] (1) High-temperature phase (austenitic phase) shape: When heated to above its phase transformation temperature, the two-way shape memory alloy will stably transform into and maintain shape A (such as elongation).

[0047] (2) Low-temperature phase (martensitic phase) shape: When cooled below its phase transformation temperature, the two-way shape memory alloy will stably recover to shape B (such as shrinkage).

[0048] The specific working process of the two-way shape memory alloy telescopic component in this utility model is as follows:

[0049] Under normal conditions (no strong light), the two-way shape memory alloy telescopic component is in the contracted state (shape B) at ambient temperature, the light shield 420 is located at the starting position, and the working window is unobstructed.

[0050] When exposed to strong light, the photothermal conversion coating quickly absorbs a large amount of light energy and rapidly transfers heat to the two-way shape memory alloy telescopic component, causing its temperature to rise above the phase transition point; the two-way shape memory alloy telescopic component actively elongates (becomes shape A), generating driving force to push the light shield 420 along the guide rail assembly 410 to the end position, completely blocking the working window.

[0051] After the strong light disappears, the heating efficiency of the photothermal conversion coating on the two-way shape memory alloy telescopic component is not as good as the natural cooling efficiency of the two-way shape memory alloy telescopic component, which allows the two-way shape memory alloy telescopic component to cool naturally in the environment; when its temperature drops below the phase transition point, the two-way shape memory alloy telescopic component actively contracts (restores shape B), pulls the light shield 420 to accurately return to the starting position, and the working window reopens without obstruction.

[0052] The phase transition temperature of the two-way shape memory alloy telescopic component can be customized according to the expected "intense light" threshold, thus determining the sensitivity of the protective action triggering. The form of the two-way shape memory alloy telescopic component can be designed as a spring of appropriate length or a spring clip, depending on the required driving force and stroke. For example, the combination of carbon black coating and a two-way shape memory alloy spring (NiTi alloy wire diameter 1.0mm, spring outer diameter 6mm, number of coils 20, phase transition temperature approximately 55℃): at 100mW / cm... 2 Under strong light irradiation, the elongation driving time (from the starting position to the ending position of the light-shielding plate 420) is 2 to 4 seconds; at 50 mW / cm 2 Under strong light irradiation, the elongation driving time (from the starting position to the ending position of the light-shielding sheet 420) is 5 to 8 seconds; at ≤10mW / cm 2 Under illumination, the heat input rate decreases, becoming less efficient than natural cooling. The unstretched two-way shape memory alloy spring will not stretch or deform at room temperature, and the light-shielding plate 420 remains at its starting position; at ≤10mW / cm²... 2 Under illumination, the heat input rate decreases and cannot match the efficiency of natural cooling. The elongated and deformed two-way shape memory alloy spring will contract and return to its original position at room temperature. The contraction and return time (the light shield 420 returns from the end position to the starting position) is 10 to 20 seconds.

[0053] This reversible cycle of heating and elongation followed by cooling and contraction eliminates the need for an external reset spring or reverse drive mechanism, perfectly meeting the physical requirement of "opening the light shield when exposed to strong light and automatically resetting after the light disappears." In this invention, the dual-path shape memory alloy telescopic component is not only a driving part but also the physical carrier for achieving "fully automatic, self-resetting, and passive protection." It works in conjunction with a photothermal conversion coating to directly convert light signals (through heat) into mechanical motion, eliminating all intermediate electrical control and transmission links, fundamentally ensuring the simplicity, environmental adaptability, and long-term reliability of the device.

[0054] For details, please refer to Figure 2 The two bidirectional shape memory alloy telescopic components are provided, and the two bidirectional shape memory alloy telescopic components are parallel to each other. This not only provides a balanced driving force for the light-shielding sheet 420 and effectively eliminates the skew torque generated by single-point driving, but also improves the smoothness and reliability of the movement of the light-shielding sheet 420, ensuring that the light-shielding sheet 420 slides more smoothly and without jamming in the guide rail assembly 410. Especially when a rapid response is required, it significantly improves the stability and accuracy of the action.

[0055] Figure 3 This shows a second cross-sectional structural schematic diagram of the ultraviolet light intensity detection device in an embodiment of the present invention. Figure 4 This diagram shows a second exploded view of the ultraviolet light intensity detection device in an embodiment of the present invention. Figure 5 This diagram shows a cross-sectional view of the light-shielding sheet when it is located at the starting position in an embodiment of the present invention. Figure 6 A cross-sectional view of the light-shielding sheet in the embodiment of this utility model is shown. The automatic light-shielding protection mechanism 400 also includes an isolation cover 500, which covers the light-transmitting window 200 from the inner top side of the housing 100. The edge of the cover opening of the isolation cover 500 is fixedly connected to the side of the guide rail assembly 410 away from the light-transmitting window 200. The light-shielding sheet 420 slides within the coverage area of ​​the isolation cover 500. One end of the light-shielding drive member 430 extends out of the isolation cover 500 away from the light-shielding sheet 420. A light-transmitting hole 510 is provided on the side of the isolation cover 500 away from the light-transmitting window 200, and the light-transmitting hole 510 exposes the working window. The isolation cover 500 defines the light path for ultraviolet rays to enter the working window through the light-transmitting hole 510, avoiding the scattering interference of stray light within the housing 100. At the same time, it minimizes the area directly affected by ultraviolet rays, protecting other components within the housing 100 from accelerated aging, embrittlement, or performance degradation due to long-term ultraviolet radiation, thereby improving the overall environmental durability of the device.

[0056] In some specific embodiments, please refer to Figures 3 to 6 The isolation cover 500 has a limiting post 520 formed inside. The top of the limiting post 520 is flush with the upper surface of the light-shielding plate 420. There is a first gap between the limiting post 520 and the light-transmitting hole 510, and the vertical projection of the starting position falls within the first gap. The limiting post 520 provides a physical stop for the retraction of the light-shielding plate 420, ensuring that it can accurately and repeatedly stop at the designed starting position each time, thereby ensuring the complete exposure of the working window and avoiding partial occlusion or measurement errors caused by incomplete repositioning.

[0057] For further details, please refer to Figures 3 to 6 The light-shielding plate 420 has a connecting post 421 formed on the side opposite to the light-transmitting window 200. The connecting post 421 and the limiting post 520 are connected based on the elastic rubber ring 600. During the sliding process of the light-shielding plate 420 towards the end position, the two-way shape memory alloy telescopic component provides the main driving thrust, which is significantly greater than the initial elastic force of the elastic rubber ring 600. As the light-shielding plate 420 moves forward, the elastic rubber ring 600 is gradually stretched, storing elastic potential energy in the process. When the strong light disappears and the two-way shape memory alloy telescopic component cools and contracts, this pre-stored elastic potential energy is released, assisting in pulling the light-shielding plate 420 back to the starting position, thereby effectively shortening the reset time and improving the response speed and operational reliability of the entire protection cycle.

[0058] In some specific embodiments, please refer to Figures 3 to 6The isolation cover 500 has an internally formed baffle frame 530 surrounding the light-transmitting aperture 510. The height of the baffle frame 530 is equal to the depth of the isolation cover 500. As a barrier to the optical channel, the baffle frame 530 effectively isolates stray light from the side, thus improving the purity and accuracy of the detection signal.

[0059] Specifically, the distance from the inner wall of the enclosure frame 530 to the edge of the light-transmitting hole 510 ranges from 0.5cm to 1.0cm. The minimum distance of 0.5cm is sufficient to effectively block stray light from the side entering at a large angle of incidence; the upper limit of 1.0cm helps to ensure compactness, so that the size of the enclosure frame 530 is not too large, and the light-shielding plate 420 can cover the entire enclosure frame 530 at the end position.

[0060] For further details, please refer to Figure 5 and Figure 6 A limiting block 422 is formed on the side of the light-shielding sheet 420 facing away from the light-transmitting window 200. The limiting block 422 is located on the side of the light-shielding sheet 420 near the limiting post 520. When the light-shielding sheet 420 advances to the endpoint position, one side of the limiting block 422 abuts against the outer peripheral surface of the enclosure frame 530. Corresponding to the limiting post 520 at the starting position, the abutment between the limiting block 422 and the enclosure frame 530 sets an insurmountable mechanical endpoint for the forward stroke of the light-shielding sheet 420. This ensures that under strong light drive, the light-shielding sheet 420 can accurately stop at the predetermined position that completely blocks the working window each time.

[0061] In some specific embodiments, please refer to Figure 2 and Figure 4 The guide rail assembly 410 includes two symmetrically arranged sub-guide rails, and the two sides of the light shield 420 are slidably disposed on the two sub-guide rails. Figure 7 The diagram illustrates the cooperative structure of the sub-guide rail and the light-shielding plate in an embodiment of this utility model. Each sub-guide rail is slidably connected to the light-shielding plate 420 based on a guide structure 700. Each guide structure 700 includes a first guide surface 710 and a second guide surface 720 that are perpendicular to each other. The first guide surface 710 is parallel to the inner top surface of the housing 100, and the second guide surface 720 is parallel to the long side surface of the housing 100. The light-shielding plate 420 has arc-shaped portions 423 formed on both sides. The lower surface of any arc-shaped portion 423 is a first plane, the upper surface of any arc-shaped portion 423 is a second plane, and the end face of any arc-shaped portion 423 is a convex arc surface. Each first plane is slidably fitted with the corresponding first guide surface 710, each second plane is slidably fitted with the inner top surface of the housing 100, and each arc surface is slidably tangent to the corresponding second guide surface 720.

[0062] The guide structure 700 is essentially L-shaped, which, in conjunction with the inner top surface of the housing 100, can effectively constrain the sliding direction of the light-shielding sheet 420. Moreover, the first plane slides in contact with the first guide surface 710, and the second plane slides in contact with the inner top surface of the housing 100, which constrains vertical movement. Furthermore, the arc surface slides tangentially with the second guide surface 720, which greatly reduces sliding resistance and the risk of jamming.

[0063] For details, please refer to Figure 7 Each of the sub-guide rails is provided with a lubrication groove 730 along its own length direction. The lubrication groove 730 is filled with grease and is located at the intersection of the first guide surface 710 and the second guide surface 720.

[0064] The lubrication groove 730 is located on the core contact line that forms the L-shaped guide angle. The grease filled in it can simultaneously and slowly wet the first guide surface 710 (which bears the weight of the light shield 420 and provides vertical guidance) and the second guide surface 720 (which provides lateral guidance through arc-shaped contact), so as to achieve continuous and effective lubrication of the two friction pairs with minimal usage. The sealing and high adhesion of the grease also make it less prone to loss or evaporation, making it especially suitable for use in situations that require long-term maintenance-free operation or complex environments.

[0065] Moreover, the continuous and stable grease transforms the dry friction or boundary friction between the arc-shaped portion 423 of the light shield 420 and the guide surface of the sub-guide rail into a fluid lubrication or mixed lubrication state. This directly reduces the driving resistance, allowing the driving force of the two-way shape memory alloy telescopic component to be more efficiently converted into the translation of the light shield 420, while significantly reducing the wear of the contact surface.

[0066] Figure 8 The diagram illustrates the mating structure of the sub-rails, housing, and isolation cover in an embodiment of this utility model. A first tenon 411 protrudes from the upper surface of any of the sub-rails, and a second tenon 412 protrudes from the lower surface of any of the sub-rails. A first mortise 101 is recessed into the inner top of the housing 100, and a second mortise 540 is recessed into the edge of the cover opening of the isolation cover 500. The first tenon 411 and the first mortise 101 engage, and the second tenon 412 and the second mortise 540 engage. Furthermore, the upper surface of any of the sub-rails is fixedly connected to the inner top of the housing 100 using adhesive, and the lower surface of any of the sub-rails is fixedly connected to the edge of the cover opening of the isolation cover 500 using adhesive.

[0067] The mechanical interlocking of the mortise and tenon structure provides shear resistance and initial positioning capability, while the adhesive fills the micro-gaps, providing uniform adhesion and excellent tensile and vibration resistance; the combination of the two ensures the installation stability, firmness and reliability between the sub-guide rail, housing 100 and isolation cover 500.

[0068] In some specific embodiments, please refer to Figures 1 to 4 The ultraviolet light intensity detection module 300 includes a circuit board 310 and a gallium nitride ultraviolet sensor 320 fixedly mounted on the circuit board 310. The circuit board 310 is fixedly mounted on the inner bottom of the housing 100 based on insulating pillars 330. The working window is the light-receiving window of the gallium nitride ultraviolet sensor 320. The insulating pillars 330 securely mount the circuit board 310 to the inner bottom of the housing 100, ensuring reliable electrical insulation between the circuit board 310 and the housing 100 while providing physical support, thus improving system safety.

[0069] For details, please refer to Figure 3 There is a gap between the circuit board 310 and the isolation cover 500, and the top (photosensitive part) of the gallium nitride ultraviolet sensor 320 extends into the interior of the isolation cover 500 through the light-transmitting hole 510. The gap between the circuit board 310 and the isolation cover 500 provides space for other components on the circuit board 310 and ensures the electrical safety distance between the circuit board 310 and the isolation cover 500.

[0070] In some specific embodiments, please refer to Figure 1 and Figure 3 The housing 100 includes a main housing 110 and a bottom cover 120. The main housing 110 has a light-transmitting window 200 on its top, and the bottom cover 120 is fixed to the bottom of the main housing 110 with screws. That is, the housing 100 is a split design, allowing all internal components, such as the ultraviolet light intensity detection module 300 and the automatic light-shielding protection mechanism 400, to be easily installed and adjusted from below the main housing 110. The bottom cover 120 is removable, greatly facilitating subsequent calibration, maintenance, or component replacement without damaging the structure of the main housing 110.

[0071] Specifically, the housing 100 is an all-metal housing, such as an aluminum housing or a stainless steel housing. The all-metal housing provides a complete Faraday cage for the internal precision circuitry (such as the signal processing circuitry of the gallium nitride ultraviolet sensor 320), effectively shielding against external electromagnetic interference and suppressing the external radiation of internal signals. This ensures a high signal-to-noise ratio and measurement accuracy, meeting the application requirements of complex electromagnetic environments. Furthermore, the all-metal housing possesses higher structural rigidity, impact resistance, and wear resistance, providing robust protection for the internal precision components.

[0072] Figure 9 This diagram shows an exploded view of the ultraviolet light intensity detection device and the connecting frame in an embodiment of the present invention. Figure 10The diagram shows a combined structure of the ultraviolet light intensity detection device and the connecting frame in an embodiment of the present invention. The ultraviolet light intensity detection device is equipped with a connecting frame 800. The connecting frame 800 includes a main frame 810 and a main frame opening 820 formed in the main frame 810. A semi-enclosed snap-fit ​​frame 830 is provided on the back of the main frame 810 along a partial edge of the main frame opening 820. A snap-fit ​​interface is provided on one side of the snap-fit ​​frame 830. A snap-fit ​​rib 130 is protruding and formed around the perimeter of the housing 100. The snap-fit ​​rib 130 is adapted to the snap-fit ​​frame 830 and can be snapped into or removed from the snap-fit ​​frame 830 through the snap-fit ​​interface.

[0073] During installation, the snap-fit ​​rib 130 of the housing 100 is horizontally snapped into the snap-fit ​​frame 830 from the snap-fit ​​interface, thus achieving a quick and stable connection between the ultraviolet light intensity detection device and the connecting frame 800; the reverse operation allows for easy removal of the ultraviolet light intensity detection device. When the ultraviolet light intensity detection device is installed in the connecting frame 800, the light-transmitting window 200 of the housing 100 is fully exposed in the main frame opening 820.

[0074] Please see Figure 9 and Figure 10 The 800 connection frame offers two flexible and secure installation methods:

[0075] Optionally, a plurality of magnets 811 are embedded on the front of the main frame 810, and the plurality of magnets 811 are evenly distributed around the main frame opening 820; by magnetic adsorption, the entire ultraviolet light intensity detection device can be quickly fixed on the surface of an iron target object, which is convenient for temporary placement, position adjustment or occasions that require frequent movement.

[0076] Optionally, the main frame 810 is provided with a plurality of connecting through holes 812, which are evenly distributed around the main frame opening 820. By inserting screws or other fasteners through the connecting through holes 812, the ultraviolet light intensity detection device can be firmly locked onto the surface of objects of various materials, which is suitable for permanent or semi-permanent installation scenarios with extremely high requirements for fixed reliability.

[0077] For details, please refer to Figure 9 and Figure 10An elastic washer 900 is provided in the snap-fit ​​frame 830. The outer periphery of the elastic washer 900 is adapted to the inner periphery of the snap-fit ​​frame 830. One side of the elastic washer 900 is in contact with the surface of the main frame 810. There is a second gap between the other side of the elastic washer 900 and the inner wall of the snap-fit ​​frame 830 away from the main frame 810. The snap-fit ​​rib 130 can be snapped into the second gap. When the snap-fit ​​rib 130 is snapped into the second gap, the side of the snap-fit ​​rib 130 away from the bottom of the housing 100 abuts against the elastic washer 900.

[0078] After the snap-fit ​​130 is inserted, the elastic washer 900 is compressed and generates a continuous rebound force. This force is converted into a normal pressure on the snap-fit ​​130, which increases the static friction and prevents the ultraviolet light intensity detection device from accidentally slipping off due to gravity or slight external force. On the other hand, the pressure is evenly applied to the surface of the snap-fit ​​130, avoiding local stress concentration.

[0079] This invention relates to an ultraviolet light intensity detection device. An automatic light-shielding protection mechanism 400 is installed above the working window of the ultraviolet light intensity detection module 300. This mechanism automatically and quickly shields the working window when exposed to strong light. The automatic light-shielding protection mechanism 400 absorbs strong light and generates heat through a photothermal conversion coating on the surface of the light-shielding drive component 430. This heat directly drives the thermal expansion of a two-way shape memory alloy telescopic component, causing the light-shielding plate 420 to slide along the guide rail assembly 410 to its final position, quickly and automatically shielding the working window. After the strong light disappears, the two-way shape memory alloy telescopic component naturally contracts as the temperature decreases, causing the light-shielding plate 420 to return to its starting position, re-exposing the working window. This design significantly shortens the exposure time of the working window under harmful strong light, avoiding problems such as signal saturation, performance drift, and device damage. Furthermore, it requires no external power supply or circuit control, relying solely on a photo-thermal-deformation mechanism for autonomous response, resulting in a simple and reliable structure.

[0080] Furthermore, the guide rail assembly 410 of the automatic light-shielding protection mechanism 400 adopts an L-shaped guide structure 700, which cooperates with the inner top surface of the housing 100 to constrain the sliding direction of the light-shielding sheet 420, effectively suppressing vertical jump. The two sides of the light-shielding sheet 420 slide tangentially with the second guide surface 720 of the guide structure 700 through arc surfaces, reducing sliding resistance and the risk of jamming. Moreover, the sub-guide rail slowly lubricates the first guide surface 710 and the second guide surface 720 through grease in the lubrication groove 730, transforming the dry friction or boundary friction between the arc-shaped portion 423 of the light-shielding sheet 420 and the guide surface of the sub-guide rail into a fluid lubrication or mixed lubrication state, further reducing driving resistance and wear. Furthermore, the sub-guide rail connects the housing 100 and the isolation cover 500 through a tenon and mortise structure and adhesive, combining mechanical interlocking and uniform adhesion, ensuring a firm and stable installation between the sub-guide rail, the housing 100, and the isolation cover 500.

[0081] Furthermore, the automatic light-shielding protection mechanism 400 limits the light path of ultraviolet rays entering the working window through the light-transmitting hole 510 of the isolation cover 500, reducing stray light interference and protecting the components inside the housing 100 from accelerated aging, embrittlement, or performance degradation caused by ultraviolet radiation. Moreover, the isolation cover 500 provides a physical stop for the retraction of the light-shielding plate 420 through the limiting post 520, ensuring accurate reset each time. The limiting post 520 is connected to the connecting post 421 of the light-shielding plate 420 via the elastic rubber ring 600, which can assist in pulling the light-shielding plate 420 back to the starting position, shortening the reset time. Additionally, the isolation cover 500 isolates lateral stray light through the enclosure frame 530, which helps improve the purity and accuracy of the detection signal. The enclosure frame 530 also cooperates with the limiting block 422 of the light-shielding plate 420 to set a mechanical endpoint for the forward stroke of the light-shielding plate 420, ensuring precise shading position.

[0082] In addition, the housing 100 and the connecting frame 800 can be quickly assembled and disassembled via the snap-fit ​​ribs 130 and snap-fit ​​frames 830. Moreover, the connecting frame 800 supports both magnetic and mechanical locking installation methods, making it easy for users to fix the entire ultraviolet light intensity detection device to the surface of the target object.

[0083] The above provides a detailed description of an ultraviolet light intensity detection device provided by the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An ultraviolet light intensity detection device, comprising a housing, a light transmission window arranged on the top of the housing, and an ultraviolet light intensity detection module arranged in the housing, the ultraviolet light intensity detection module having a working window, the working window facing the light transmission window, characterized in that, An automatic light-shielding protection mechanism is provided above the working window; The automatic light-shielding protection mechanism includes a guide rail assembly fixed to the top of the housing, a light-shielding sheet slidably disposed in the guide rail assembly, and a light-shielding drive component arranged along the sliding direction of the light-shielding sheet. The light-shielding sheet and the light-shielding drive component are exposed in the light-transmitting window. One end of the light-shielding drive is fixedly connected to the light-shielding plate, and the other end is fixed to the inner wall of the housing; the sliding path of the light-shielding plate has a starting position and an ending position, the starting position avoids the working window, and the ending position blocks the working window; The light-shielding drive is a two-way shape memory alloy telescopic component with a photothermal conversion coating on its surface. The light-shielding sheet is driven by the light-shielding drive to move forward along the guide rail assembly to the end position or back to the starting position.

2. The ultraviolet light intensity detection device as described in claim 1, characterized in that, The two-way shape memory alloy telescopic component is a cylindrical spiral-shaped two-way shape memory alloy spring or a wave-shaped two-way shape memory alloy sheet.

3. The ultraviolet light intensity detection device as described in claim 1, characterized in that, The automatic light-shielding protection mechanism also includes an isolation cover that covers the light-transmitting window from the inner top side of the housing; The edge of the shield opening is fixedly connected to the side of the guide rail assembly away from the light-transmitting window. The light-shielding sheet slides within the coverage area of ​​the shield. The end of the light-shielding drive unit away from the light-shielding sheet extends out of the shield. The isolation cover has a light-transmitting hole on the side away from the light-transmitting window, and the light-transmitting hole exposes the working window.

4. The ultraviolet light intensity detection device as described in claim 3, characterized in that, The isolation cover has a limiting post formed inside, the top of the limiting post is flush with the upper surface of the light-shielding sheet, there is a first gap between the limiting post and the light-transmitting hole, and the vertical projection of the starting position falls within the first gap.

5. The ultraviolet light intensity detection device as described in claim 4, characterized in that, The side of the light-shielding sheet opposite to the light-transmitting window is formed with a connecting post, and the connecting post and the limiting post are connected by an elastic rubber ring.

6. The ultraviolet light intensity detection device as described in claim 4, characterized in that, The isolation cover has an internally formed enclosure frame that surrounds the light-transmitting opening. The height of the enclosure frame is equal to the depth of the isolation cover.

7. The ultraviolet light intensity detection device as described in claim 6, characterized in that, A limiting block is formed on the side of the light-shielding sheet facing away from the light-transmitting window, and the limiting block is located on the side of the light-shielding sheet close to the limiting post. When the light-shielding sheet moves to the end position, one side of the limiting block abuts against the outer peripheral surface of the enclosure frame.

8. The ultraviolet light intensity detection device as described in claim 1, characterized in that, The guide rail assembly includes two symmetrically arranged sub-guide rails, and the two sides of the light-shielding sheet are slidably disposed on the two sub-guide rails; Each of the sub-guide rails is slidably connected to the light-shielding sheet based on a guide structure. Each of the guide structures includes a first guide surface and a second guide surface that are perpendicular to each other. The first guide surface is parallel to the inner top surface of the housing, and the second guide surface is parallel to the long side surface of the housing. The light-shielding sheet has arc-shaped portions formed on both sides, the lower surface of any arc-shaped portion is a first plane, the upper surface of any arc-shaped portion is a second plane, and the end face of any arc-shaped portion is an outwardly convex arc surface. Any of the first planes slides into contact with the corresponding first guide surface, any of the second planes slides into contact with the inner top surface of the housing, and any of the arc surfaces slides tangentially to the corresponding second guide surface.

9. The ultraviolet light intensity detection device as described in claim 8, characterized in that, Each of the sub-guide rails is provided with a lubrication groove along its own length direction, the lubrication groove is filled with grease, and the lubrication groove is located at the intersection of the first guide surface and the second guide surface.

10. The ultraviolet light intensity detection device as described in claim 1, characterized in that, The ultraviolet light intensity detection module includes a circuit board and a gallium nitride ultraviolet sensor fixedly mounted on the circuit board. The circuit board is fixedly mounted on the inner bottom of the housing based on insulating pillars. The working window is the light-receiving window of the gallium nitride ultraviolet sensor.

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