A carduus lamp box applied to high-speed service area

Abstract

The utility model relates to the technical field of card cloth lamp box, especially to a kind of card cloth lamp box applied to high-speed service area, including box body support, and respectively install in the lamp source subassembly and canvas face frame of box body support, the outside wall of canvas face frame is equipped with soft membrane canvas, the inner side of lamp source subassembly is installed relative to soft membrane canvas, to irradiate the back of soft membrane canvas;The periphery edge of canvas face frame, the side facing soft membrane canvas is equipped with face frame clamping groove;The periphery edge of soft membrane canvas is equipped with canvas adhesive tape, canvas adhesive tape is embedded in face frame clamping groove, forms buckle connection, to install soft membrane canvas detachably in canvas face frame. Above all, by adhesive tape clamping groove buckle connection, cooperate with inclined clamping groove, barb protruding strip and auxiliary cover, realize elastic sealing, firm wind resistance, guarantee canvas flatness;With the design of adhesive tape and pull rope, it is convenient to disassemble, adapt to the demand of high-speed service area.

Description

Technical Field

[0001] This utility model relates to the technical field of light boxes, and in particular to a light box for use in highway service areas. Background Technology

[0002] As an advertising display device widely used in commercial promotion, the lightbox plays an important role in outdoor scenarios such as highway service areas. Its core structure typically consists of a metal frame, LED light sources, and a flexible canvas. The metal frame, commonly made of materials such as aluminum alloy or stainless steel, primarily provides stable structural support for the lightbox and secures the various components. The LED light sources, often in the form of light strips or tubes, provide ample and uniform illumination to highlight the content displayed on the flexible canvas. The flexible canvas, using technologies such as UV printing, carries various customized patterns and color information, serving as the core carrier of the advertising display.

[0003] However, existing light boxes have some structural design shortcomings, especially in special scenarios such as highway service areas. Currently, most light boxes use a rigid, snap-fit ​​connection method, such as direct snap-fit ​​between flanges and grooves. This connection method results in poor sealing of the light box. In highway service areas, dust kicked up by passing vehicles and rainwater can easily enter the light box through gaps created by the rigid connection, accelerating the aging of the LED light source and shortening the overall lifespan of the light box.

[0004] Regarding canvas fixation, the flexible canvas is highly susceptible to loosening and wrinkling due to the large temperature differences between day and night in highway service areas and the vibrations from vehicle traffic, severely affecting the clear display and dissemination of advertising information. Meanwhile, rigid fasteners may become over-tightened due to compression and deformation over long-term use. When canvas replacement is needed, it often requires forceful disassembly, which not only increases maintenance costs but may also cause irreversible damage to the lightbox frame and canvas, reducing the overall durability of the lightbox.

[0005] Therefore, developing a new type of canvas lightbox with a novel structure to improve its sealing performance, canvas stability, and ease of maintenance in complex outdoor environments such as highway service areas has become an urgent problem to be solved in this field. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0007] This utility model provides a light box for use in highway service areas, including a box frame, a light source assembly and a canvas frame respectively installed on the box frame. A soft film canvas is installed on the outer wall of the canvas frame, and the light source assembly is installed relative to the inner side of the soft film canvas to illuminate the back of the soft film canvas. A frame slot is provided on the side of the canvas frame facing the soft film canvas at the four edges. A canvas adhesive strip is provided on the four edges of the soft film canvas, and the canvas adhesive strip is embedded in the frame slot to form a snap connection, thereby detachably installing the soft film canvas onto the canvas frame.

[0008] Furthermore, the canvas adhesive strip is made of elastic rubber or silicone.

[0009] Furthermore: the face frame slot is set as an inclined slot, so that the opening direction of the face frame slot is inclined towards the edge of the canvas face frame, forming an oblique angle α with the canvas plane, where α < 90°.

[0010] Furthermore, the inner wall of the face frame slot is provided with barbed reinforcing ridges, and multiple reinforcing ridges are evenly distributed along the embedding direction of the canvas adhesive strip.

[0011] Furthermore, an auxiliary cover is provided on the frame at the four edges of the canvas frame. The auxiliary cover bends inward from the frame of the canvas frame and corresponds to the front of the opening of the frame slot. The distance between the auxiliary cover and the opening of the frame slot is less than the natural width of the canvas adhesive strip, thereby blocking the canvas adhesive strip from coming off.

[0012] Furthermore: the light source assembly is provided with a light strip back plate and light-emitting light strips. The light strip back plate is fixed to the housing bracket, and multiple light-emitting light strips are evenly spaced and installed on the side of the light strip back plate facing the soft film canvas.

[0013] Furthermore, an accessory box is provided on the back of the light strip back panel, and an opening is provided on the light strip back panel so that the accessory box is fixed to the opening of the light strip back panel, and a cover plate is closed on the opening.

[0014] Furthermore, the back of the light strip backplate is also equipped with a cable routing tube, which is fixed to the light strip backplate and is used to accommodate the connecting cables of the light strip.

[0015] Furthermore, it also includes air guide side plates, which are installed on both sides of the box frame where the soft film canvas is not installed, for guiding airflow.

[0016] Furthermore, it also includes a top box, which is fixed to the top of the box support and is used to display long-term fixed graphic and textual content.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. Elastic Sealing and Stable Connection: A frame slot is created around the four edges of the canvas frame, and canvas adhesive strips are installed around the four edges of the soft canvas. These adhesive strips, made of elastic rubber or silicone, are embedded into the frame slots to form a snap-fit ​​connection. The gap between the canvas adhesive strip and the frame slot is ≤0.5mm. After embedding, the adhesive strip achieves a tight seal through elastic deformation, effectively preventing dust and rainwater from entering the lightbox and avoiding damage to the light source. It also prevents the canvas from loosening due to external forces, enhancing the overall structural stability of the lightbox.

[0019] 2. Slanted Slot Enhances Stability and Wind Resistance: The frame slot is slanted, with its opening angled towards the edge of the canvas frame at an angle α (α < 90°) to the canvas plane. After the adhesive strip is embedded, it forms a "7-shaped" force-bearing structure with the flexible canvas. The slanted inner wall of the slot exerts a "wedge effect" on the adhesive strip, making the canvas connection tighter. In strong winds, the wind force is converted into pressure that pushes the adhesive strip deeper into the slot, creating a dynamic reinforcement effect that tightens over time. This fundamentally avoids the problem of the adhesive strip loosening or coming off due to wind pulling, which is common with traditional vertical slots. It is especially suitable for outdoor environments with strong airflow, such as highway service areas, ensuring the lightbox's normal operation in extreme weather conditions.

[0020] 3. Reinforced Protrusions Enhance Connection Strength and Sealing: The inner wall of the frame slot features barbed reinforcing protrusions, with multiple protrusions evenly distributed along the embedding direction of the canvas adhesive strip. These protrusions are acute-angled triangular, forming a composite connection of "physical anchoring + elastic interlocking" with the adhesive strip. The barbed structure has unidirectional force characteristics, allowing the adhesive strip to pass smoothly when embedded and being reversed when an external force attempts to remove it, preventing movement. Simultaneously, the protrusions form evenly distributed interlocking points on the adhesive strip surface, enhancing both connection strength and structural sealing. Under strong wind impact, the protrusions disperse concentrated loads, creating a "the greater the load, the stronger the interlocking force" effect. Working in conjunction with the inclined slot, this provides the lightbox with a "zero-fallout" structural guarantee.

[0021] 4. Optimized Coordination of Auxiliary Covers and Removal Pull Cords: Auxiliary covers are installed on the frame around the four edges of the canvas faceplate. These covers bend inwards from the frame and are positioned directly in front of the opening of the faceplate slot. The distance between the auxiliary cover and the slot opening is less than the natural width of the canvas adhesive strip, effectively preventing the adhesive strip from detaching. Even in extreme conditions such as strong winds, the adhesive strip cannot completely detach. Simultaneously, a removal pull cord is installed at one edge of the adhesive strip. Pulling the cord during removal utilizes the Poisson effect to narrow the adhesive strip, allowing it to be pulled out through the gap between the auxiliary cover and the slot opening. This ensures reliable anti-detachment of the adhesive strip during daily use and solves the problem of difficult disassembly of rigid structures, making it suitable for the needs of highway service area light boxes that require frequent canvas changes while protecting the frame structure.

[0022] Therefore, this utility model achieves elastic sealing, stable wind resistance, and ensures the flatness of the canvas by using adhesive strips and slots for buckle connection, combined with inclined slots, barbed protrusions, and auxiliary covers; the design of adhesive strips and pull ropes facilitates disassembly and assembly, and is suitable for the needs of highway service areas.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the overall structure of the fabric light box of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the lamp source assembly of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the back plate and cover plate of the light strip of this utility model;

[0028] Figure 4 This is a structural schematic diagram of the lightbox bracket and canvas frame of this utility model;

[0029] Figure 5 This is a structural schematic diagram of the back panel of the light strip and the accessory box of this utility model;

[0030] Figure 6 This is a structural diagram of the canvas frame and the soft film canvas of this utility model in a separated state.

[0031] Figure 7 This is a structural diagram of the canvas frame and the soft film canvas of this utility model in their combined state.

[0032] Figure 8 yes Figure 7 Schematic diagram of the cross-section at point C;

[0033] Figure 9 yes Figure 8 A magnified view of a portion of point A in the middle.

[0034] The reference numerals and names in the figure are as follows:

[0035] 10. Cabinet support; 11. Air guide side panel; 12. Base; 13. Guardrail; 20. Light source assembly; 21. Light strip back panel; 22. Opening; 23. Light strip; 24. Accessory box; 25. Cover plate; 26. Cable management conduit; 30. Canvas frame; 31. Frame slot; 32. Reinforcing ridge; 33. Auxiliary cover; 40. Soft film canvas; 41. Canvas adhesive strip; 50. Top cabinet. Detailed Implementation

[0036] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] Please see Figures 1 to 9 In this embodiment of the present invention, a light box for use in highway service areas includes a box support 10, and a light source assembly 20 and a canvas frame 30 respectively installed on the box support 10. A soft film canvas 40 is installed on the outer wall of the canvas frame 30. The light source assembly 20 is installed relative to the inner side of the soft film canvas 40 to illuminate the back of the soft film canvas 40. A frame slot 31 is provided on the side of the canvas frame 30 facing the soft film canvas 40 at the four edges. A canvas adhesive strip 41 is provided on the four edges of the soft film canvas 40. The canvas adhesive strip 41 is embedded in the frame slot 31 to form a snap-fit ​​connection, thereby detachably installing the soft film canvas 40 onto the canvas frame 30.

[0038] Specifically, the lightbox is an advertising display device with a metal frame, equipped with a high-brightness LED light source and interchangeable images. Its core structure includes three components: the frame, LED light strips, and a UV soft film canvas 40. The frame is typically made of aluminum alloy or stainless steel, providing structural support and fixation. The light source can use common LED light strips or tubes to ensure sufficient and uniform illumination. The soft film canvas 40 is the core of the display and can be customized with various patterns and colors. However, existing lightboxes typically use rigid, snap-fit ​​connections for fixation, such as direct snap-fit ​​between flanges and grooves, without elastic adhesive strips. This has significant drawbacks in high-speed service area scenarios, such as poor sealing: the gaps in rigid connections are prone to dust and water ingress, accelerating light source aging; the canvas is prone to loosening: without the tension of elastic adhesive strips, the soft film canvas 40 is prone to wrinkling under temperature changes (large day-night temperature differences) or vibration; disassembly is inconvenient: rigid snap-fit ​​connections may become stuck due to long-term compression, requiring forceful disassembly when replacing the canvas, increasing maintenance costs. Therefore, improvements are necessary.

[0039] This invention utilizes a frame slot 31 formed at the four edges of the canvas frame 30 and a canvas adhesive strip 41 installed at the four edges of the flexible canvas 40. The elastic rubber canvas adhesive strip 41 is embedded in the frame slot 31 via a snap-fit ​​connection structure, providing the entire installation structure with elastic sealing, flatness assurance, and convenient maintenance. This perfectly matches the requirements of high-speed service area scenarios for lightbox durability, display effect, and ease of maintenance. The canvas adhesive strip 41 can be fixedly connected to the four edges of the flexible canvas 40 using existing processes such as stitching, heat sealing, vulcanization, or adhesive bonding.

[0040] Secondly, to achieve stronger sealing and stability, the snap-fit ​​connection uses a "glue strip embedded in the slot" structure to form a tight mechanical engagement. The gap between the canvas glue strip 41 and the frame slot 31 is ≤0.5mm, ensuring that the glue strip achieves a seal through elastic deformation after being embedded. In particular, after the elastic glue strip at the edge of the soft canvas 40 is squeezed into the frame slot 31, it will fill the gap due to elastic deformation. This not only prevents dust and rainwater, which are common in highway service areas, from seeping into the light box (affecting the life of the light source), but also prevents the canvas from loosening due to strong airflow from passing vehicles or human contact. Moreover, the soft canvas 40 of the snap-fit ​​light box has a certain degree of extensibility. The "elastic embedding" method of the snap-fit ​​connection can keep the canvas flat through the tension of the glue strip, avoiding wrinkles. This is crucial for light boxes in highway service areas that need to clearly display information (such as directions and advertisements).

[0041] In addition, the snap-on connection does not require complicated tools. The canvas can be removed and replaced by pressing or prying the adhesive strip, which is suitable for the frequent content updates of the light boxes in highway service areas. In contrast, traditional snap-on connections (such as metal clips) may loosen due to long-term vibration (vehicle impact) and are prone to damaging the canvas or frame during disassembly.

[0042] Preferably, the canvas adhesive strip 41 is made of elastic rubber or silicone.

[0043] Specifically, the canvas adhesive strip 41 needs to have a certain degree of elasticity. Therefore, it can be made of elastic rubber material, so that when the canvas adhesive strip 41 is embedded in the frame slot 31, it can utilize its elastic deformation characteristics to be pressed into the frame slot 31 by manual pressing, etc., to achieve quick installation. After the canvas adhesive strip 41 enters the frame slot 31, due to its elastic deformation characteristics, its shape rebounds and fills the entire interior of the frame slot 31, enhancing sealing and stability.

[0044] Secondly, in order to further optimize the weather resistance of the canvas adhesive strip 41, especially to adapt to outdoor use scenarios with large temperature differences, the canvas adhesive strip 41 is preferably made of aging-resistant silicone material. Silicone material also has elasticity and can achieve a certain degree of elastic deformation, which makes it more resistant to aging and extends its service life.

[0045] like Figure 8 and Figure 9 As shown, preferably, the face frame slot 31 is configured as an inclined slot, so that the opening direction of the face frame slot 31 is inclined toward the edge of the canvas face frame 30, forming an oblique angle with the canvas plane at angle α, where α < 90°.

[0046] Specifically, the frame slot 31 is tilted at a certain angle towards the edge of the canvas frame 30, so that after the canvas adhesive strip 41 is embedded in the frame slot 31, the angle between it and the flexible canvas 40 is less than 90° and greater than 30°. The tilted angle of the frame slot 31 enhances the installation stability of the flexible canvas 40. After the canvas adhesive strip 41 at the edge of the flexible canvas 40 is embedded in the tilted slot, the adhesive strip and the flexible canvas 40 body naturally form a "7" shaped force-bearing structure. The adhesive strip is pressed along the angle of the tilted slot, while the canvas body maintains planar tension, and the connection between the two is a bent shape similar to a "hook".

[0047] Secondly, the angled design of the inclined slot creates a "wedge effect" after the canvas adhesive strip 41 is embedded. The adhesive strip undergoes elastic deformation due to the pressure from the inclined inner wall of the slot, and its reaction force pulls the canvas taut towards the inner side of the canvas frame 30, forming a locking state similar to "the more you pull, the tighter it gets." When encountering strong winds (such as typhoons), the impact of the airflow on the flexible canvas 40 is converted into pressure that causes the adhesive strip to embed deeper into the slot. The stronger the wind, the stronger the friction and pressure between the adhesive strip and the inner wall of the slot, resulting in a tighter connection structure. This fundamentally avoids the problem of the adhesive strip loosening or coming off due to wind pulling caused by traditional vertical slots.

[0048] Furthermore, the "7-shaped" structure ensures that the edge force direction of the flexible canvas 40 complements the planar tension direction. The tension of the canvas itself ensures a smooth, wrinkle-free surface, while the oblique pulling force of the inclined groove on the adhesive strip counteracts the canvas's tendency to loosen due to temperature changes (thermal expansion and contraction) or vibration. This is particularly suitable for the complex conditions of outdoor environments such as day-night temperature differences and vehicle airflow impact in highway service areas. Compared to vertical grooves (where the adhesive strip is only subjected to compressive force perpendicular to the canvas), the inclined groove allows the adhesive strip to simultaneously bear axial compressive force (along the inclined direction of the groove) and radial frictional force (contact friction with the inner wall of the groove). The superposition of these two forces significantly improves the adhesive strip's pull-out resistance. Even in extreme weather conditions such as typhoons, when the canvas is pulled outward by strong winds, the contact area and friction between the adhesive strip and the groove increase with the increase in tension, creating a "dynamic reinforcement" effect.

[0049] Therefore, the tilted slot design upgrades the traditional "passive fixing" of the connection method to "active wind resistance" through "7-shaped force structure + wedge effect + dynamic reinforcement mechanism". It is especially suitable for strong airflow environments such as highway service areas. It can not only ensure the long-term flat display of the soft film canvas 40, but also resist the extreme wind force of typhoon level, forming a dual advantage in structural stability and scene adaptability.

[0050] like Figures 7 to 9 As shown, preferably, the inner sidewall of the face frame slot 31 is provided with barbed reinforcing ridges 32, and multiple reinforcing ridges 32 are evenly distributed along the embedding direction of the canvas adhesive strip 41.

[0051] Specifically, the inner wall of the inclined slot of the canvas frame 30 has multiple barbed reinforcing ridges 32 evenly distributed along the embedding direction of the canvas adhesive strip 41. The ridges are acute-angled triangular protrusions (the longitudinal section along their length is an acute-angled triangle), with their tips facing inwards from the slot (opposite to the direction of the adhesive strip's release), and their roots integrally formed with the inner wall of the slot, creating an array structure similar to "one-way ratchet". When the elastic canvas adhesive strip 41 is embedded along the inclined slot, the ridges will squeeze the surface of the adhesive strip and sink into its elastic matrix, forming a composite connection of "physical anchoring + elastic interlocking".

[0052] Secondly, the barbed structure of the reinforced convex strip 32 has a clear unidirectional force characteristic: when the rubber strip is inserted, the tip of the convex strip is temporarily "avoided" due to the elastic deformation of the rubber strip, and smoothly enters the deep groove; when the rubber strip is subjected to external force (such as strong wind pulling) and attempts to come out, the tip of the convex strip will pierce into the interior of the rubber strip in the opposite direction, and generate "locking resistance" through the acute angle structure, preventing the rubber strip from moving in the direction of release. This principle, similar to "ratchet anti-reverse," makes the insertion and release of the rubber strip mechanically "irreversible," fundamentally eliminating the risk of loosening.

[0053] Secondly, the height of the reinforcing ridge 32 is 0.5-1mm, and the spacing between adjacent ridges is 5-8mm, which can form evenly distributed interlocking points on the surface of the rubber strip. Multiple ridges are evenly distributed along the inner wall of the slot, and after being embedded in the rubber strip, they will form multi-point compression deformation: the part of the rubber strip that is "bitten" by the ridge will produce local depressions, while the rubber strip body between the depressions will be tightly attached to the inner wall of the slot. This not only enhances the connection strength through the physical anchoring of the ridges, but also uses the elasticity of the rubber strip to fill the gaps between the ridges, further improving the structural sealing (preventing dust and rainwater from seeping in from the gaps).

[0054] In addition, when the flexible canvas 40 is subjected to strong wind impact, the tension is transmitted to the slot through the adhesive strip: the convex strip array disperses the concentrated load to multiple contact points, avoiding the adhesive strip from tearing due to excessive force at a single point; at the same time, the barbed structure converts the axial tension into a positive pressure perpendicular to the surface of the convex strip, so that the friction between the adhesive strip and the slot increases synchronously with the increase of wind force, forming a dynamic reinforcement effect of "the greater the load, the stronger the interlocking force".

[0055] Therefore, the barbed reinforcing ridge 32 design, together with the "7-shaped force-bearing structure" of the inclined slot, creates a synergistic effect: the inclined slot converts wind force into "pressurizing force" through its angle design, while the barbed ridge prevents the adhesive strip from coming off through "backstop locking." The combination of the two gives the entire connection system dual performance of "active anti-pull-out + passive anti-loosening." Especially in extreme weather conditions such as typhoons, when the flexible canvas 40 is subjected to strong outward pulling force, the "biting force" of the ridge on the adhesive strip increases linearly with the pulling force, completely solving the loosening problem caused by insufficient friction in traditional slots, and providing "zero-drop" level structural protection for light boxes in outdoor scenarios such as highway service areas.

[0056] like Figures 7 to 9 As shown, preferably, an auxiliary cover 33 is provided on the frame at the four edges of the canvas frame 30. The auxiliary cover 33 bends inward from the frame of the canvas frame 30 and corresponds to the front of the opening of the frame slot 31. The distance between the auxiliary cover 33 and the opening of the frame slot 31 is less than the natural width of the canvas adhesive strip 41, thereby blocking the canvas adhesive strip 41 from coming off.

[0057] Specifically, to further restrict the removal of the canvas adhesive strip 41, an auxiliary cover 33 can be provided. This auxiliary cover 33, formed by bending 90° from the frame, acts as a blocking cover directly in front of the opening of the frame slot 31. Even if the canvas adhesive strip 41 extends a certain distance outward, it will be blocked by the auxiliary cover 33 and cannot be completely removed. To facilitate the removal of the canvas adhesive strip 41 during disassembly, a disassembly pull rope (not shown in the figure) can be provided at one edge of the canvas adhesive strip 41. When disassembly is required, pulling the disassembly pull rope forcefully deforms the canvas adhesive strip 41, allowing it to be pulled out through the gap between the opening of the frame slot 31 and the auxiliary cover 33.

[0058] Secondly, the four edges of the canvas frame 30 are formed by bending aluminum alloy in one piece, and a rigid auxiliary cover 33 with a 90° inward bend extends from the side facing the soft film canvas 40. The auxiliary cover 33 and the opening of the frame slot 31 form a "rigid narrow gap" with a fixed distance, and the gap size is smaller than the natural width of the canvas adhesive strip 41 (in the unpressurized state).

[0059] Secondly, when the canvas adhesive strip 41 is embedded in the inclined slot, the strip undergoes elastic deformation due to the oblique compression of the slot. The auxiliary cover 33, acting as a non-deformable metal baffle, forms a "physical locking boundary" for the adhesive strip. Under normal conditions, the canvas adhesive strip 41 is held tightly against the inner wall of the slot under tension, with a certain gap maintained between the auxiliary cover 33 and the adhesive strip, ensuring the flatness of the canvas is not affected. When encountering strong winds (such as typhoons), the flexible canvas 40 experiences outward pulling force, causing the adhesive strip to move towards the slot opening. At this time, because the width of the adhesive strip is greater than the gap of the "rigid barrier," it is directly blocked by the auxiliary cover 33 and cannot detach. This rigid limiting and the "wedge effect" of the inclined slot work synergistically. The stronger the wind, the stronger the pressure on the adhesive strip between the inner wall of the slot and the auxiliary cover 33, resulting in a tighter connection and fundamentally eliminating the risk of the adhesive strip detaching from the slot due to strong pulling force.

[0060] Furthermore, since the auxiliary cover 33 is a rigid aluminum alloy structure (without elastic deformation space), the removal of the canvas adhesive strip 41 relies on the principle of directional tensile deformation. Therefore, a high-toughness removal pull rope is integrated into one edge of the adhesive strip (fixed to the adhesive strip body by stitching, etc.). During removal, pulling the pull rope causes the adhesive strip to be axially stretched along its length, and its width will temporarily shrink due to the "Poisson effect" (the shrunken width is less than the gap of the "rigid barrier"). At this time, the adhesive strip can be gradually pulled out from the gap between the auxiliary cover 33 and the slot opening. This design precisely adapts to the characteristics of the rigid auxiliary cover 33: it uses the pull rope to achieve controllable shrinkage of the adhesive strip, solving the problem that the "rigid barrier" cannot be expanded through elastic deformation, while ensuring that the aluminum alloy canvas frame 30 or the auxiliary cover 33 will not be damaged during removal (avoiding deformation caused by violent prying), thus meeting the needs of highway service area light boxes that "frequently change canvases but need to protect the frame structure".

[0061] Therefore, the rigid notch formed by the auxiliary cover 33 and the slot opening can prevent the rubber strip from coming off, while the removal pull rope solves the problem of the rigid structure being difficult to disassemble. During normal use, the width of the rubber strip is greater than the notch spacing, so it cannot come off; during disassembly, the rubber strip can be partially contracted by pulling the rope, and then pulled out from the notch, achieving the dual effect of 'reliable anti-detachment and convenient disassembly'.

[0062] like Figure 2 As shown, preferably, the light source assembly 20 is provided with a light strip back plate 21 and light-emitting light strips 23. The light strip back plate 21 is fixed to the housing bracket 10, and multiple light-emitting light strips 23 are evenly spaced and installed on the side of the light strip back plate 21 facing the soft film canvas 40.

[0063] Specifically, the light strips 23 can be LED light strips from the prior art, and multiple light strips 23 are evenly distributed to make the light illuminating the soft film canvas 40 more uniform. In order to improve the viewing angle of the light box, it is preferable to set the light source assembly 20, the canvas frame 30 and the soft film canvas 40 on both sides of the box support 10.

[0064] Secondly, the back plate 21 of the light strip is fixed to the bracket 10 of the box and is parallel to and opposite to the canvas frame 30; multiple light strips 23 are evenly spaced along the length of the back plate 21 (preferably 10-15cm apart), with their light-emitting surfaces facing the soft film canvas 40, to ensure that the light is evenly irradiated on the back of the canvas.

[0065] like Figures 2 to 5 As shown, preferably, the back of the light strip back plate 21 is also provided with an accessory box 24, and an opening 22 is provided on the light strip back plate 21 so that the accessory box 24 is fixed to the opening 22 of the light strip back plate 21, and a cover plate 25 is closed on the opening 22.

[0066] Specifically, the side of the backplate 21 used to mount the LED strip 23 is designated as the front, and the opposite side is designated as the back. Preferably, an accessory box 24 is provided on the back of the backplate 21 to accommodate and secure power accessories such as the transformer for the LED strip 23. An opening 22 is also provided on the front of the backplate 21, allowing the accessory box 24 to be installed precisely at the opening 22, facilitating subsequent maintenance and repair. A cover plate 25 is provided at the opening 22, and the cover plate 25 is detachably connected to the backplate 21 (e.g., secured with bolts), thus protecting the power accessories when not under maintenance.

[0067] like Figure 5 As shown, preferably, the back of the light strip back plate 21 is also provided with a cable tray 26, which is fixed to the light strip back plate 21 and is used to accommodate the connecting cable of the light strip 23.

[0068] Specifically, since there are a large number of LED strips 23, there are also a lot of connecting cables. To avoid clutter, a conduit 26 can be installed to hide the wires of the LED strips, making them safer and more aesthetically pleasing.

[0069] like Figures 1 to 2 As shown, preferably, it also includes air guide side plates 11, which are installed on both sides of the box bracket 10 where the soft film canvas 40 is not installed, and are used to guide the airflow.

[0070] Specifically, on the two larger sides of the lightbox, a flexible canvas 40 can be installed to display rich content. The two smaller sides are typically enclosed directly with aluminum alloy plates. To cope with strong winds, the canvas frames 30 on both sides of the lightbox are preferably staggered horizontally by a predetermined distance, creating inclined airflow surfaces on both sides. Airflow guide plates 11 cover these surfaces, guiding airflow along the inclined direction and reducing direct impact on the flexible canvas 40.

[0071] like Figures 1 to 3As shown, preferably, it also includes a top box 50, which is fixed to the top of the box support 10 and is used to display long-term fixed graphic content.

[0072] Specifically, a top cabinet 50 can be installed at the top of the lightbox, with LED beads or strips installed inside. The outer cabinet displays graphic and textual content that needs to be permanently displayed, such as a service area name. Since it doesn't need frequent replacement, the display panel of the top cabinet 50 can be made of a relatively sturdy material. The frame of the top cabinet 50 is also made of aluminum alloy to support the display panel. The display panel can be manufactured using existing technologies such as acrylic sheets or high-transmittance PC endurance sheets (anti-yellowing type) + screen-printed graphics. PC endurance sheets have a light transmittance of 85%-90% (close to glass), are three times more impact-resistant than acrylic, and have excellent weather resistance (after adding UV inhibitors, they can withstand long-term exposure to sunlight, with no significant yellowing for 5-8 years), making them suitable for outdoor highway service area scenarios. The graphics are printed on the inside of the PC board using screen printing (to avoid outdoor wear and tear). Non-transparent areas are covered with light-shielding ink (such as white or black), while the transparent areas retain the original transparency of the PC board, creating an effect where "light shines through when the light is on, and the panel appears in a single color (such as a white background) when the light is off." The ink adheres strongly to the PC board, is resistant to high and low temperatures (-40℃ to 120℃), and will not peel or fade over long-term use, perfectly matching the light transmission requirements of the internal LED chips.

[0073] like Figures 1 to 4 As shown, preferably, the box support 10 is further provided with a base 12 and a guardrail 13. The base 12 is fixed to the bottom of the box support 10 and is used to install the light box on the outside. The guardrail 13 is fixed to the lower part of the box support 10 around the perimeter and is used to protect the light box.

[0074] Specifically, since the light box needs to be installed on a sturdy material such as ground bolts or steel frames, a base 12 can be connected to the bottom of the box bracket 10 by welding or other fixing methods. The base 12 is then used to fix the light box to external infrastructure (such as the ground or steel frames). To protect the light box, a guardrail 13 can also be connected to the lower part of the box bracket 10 by bolts to prevent people or vehicles from hitting the light box.

[0075] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A lightbox for use in highway service areas, characterized in that, The device includes a housing support (10), a light source assembly (20) and a canvas frame (30) respectively installed on the housing support (10). A soft film canvas (40) is installed on the outer wall of the canvas frame (30). The light source assembly (20) is installed relative to the inner side of the soft film canvas (40) to illuminate the back of the soft film canvas (40). A frame slot (31) is provided on the side of the canvas frame (30) facing the soft film canvas (40) at the four edges. A canvas adhesive strip (41) is provided on the four edges of the soft film canvas (40). The canvas adhesive strip (41) is embedded in the frame slot (31) to form a snap-fit ​​connection, thereby detachably installing the soft film canvas (40) onto the canvas frame (30).

2. The light box for use in highway service areas according to claim 1, characterized in that, The canvas adhesive strip (41) is made of elastic rubber.

3. A lightbox for use in highway service areas according to claim 1, characterized in that, The face frame slot (31) is set as an inclined slot, so that the opening direction of the face frame slot (31) is inclined towards the edge of the canvas face frame (30), forming an oblique angle with the canvas plane at an angle α, where α < 90°.

4. A lightbox for use in highway service areas according to claim 1, characterized in that, The inner wall of the face frame slot (31) is provided with barbed reinforcing ridges (32), and multiple reinforcing ridges (32) are evenly distributed along the embedding direction of the canvas adhesive strip (41).

5. A lightbox for use in highway service areas according to claim 1, characterized in that, An auxiliary cover (33) is provided on the frame at the four edges of the canvas frame (30). The auxiliary cover (33) bends inward from the frame of the canvas frame (30) and corresponds to the front of the opening of the frame slot (31). The distance between the auxiliary cover (33) and the opening of the frame slot (31) is less than the natural width of the canvas adhesive strip (41), thereby blocking the canvas adhesive strip (41) from coming off.

6. A lightbox for use in highway service areas according to claim 1, characterized in that, The light source assembly (20) is provided with a light strip back plate (21) and light-emitting light strips (23). The light strip back plate (21) is fixed to the box bracket (10). Multiple light-emitting light strips (23) are evenly spaced and installed on the side of the light strip back plate (21) facing the soft film canvas (40).

7. A light box for use in highway service areas according to claim 6, characterized in that, The back of the light strip back plate (21) is also provided with an accessory box (24), and an opening (22) is provided on the light strip back plate (21) so that the accessory box (24) is fixed to the opening (22) of the light strip back plate (21), and a cover plate (25) is closed on the opening (22).

8. A lightbox for use in highway service areas according to claim 6, characterized in that, The back of the light strip backplate (21) is also provided with a cable tray (26), which is fixed to the light strip backplate (21) and is used to accommodate the connecting cable of the light strip (23).

9. A lightbox for use in highway service areas according to claim 1, characterized in that, It also includes air guide side plates (11), which are installed on both sides of the box bracket (10) where the soft film canvas (40) is not installed, for guiding airflow.

10. A lightbox for use in highway service areas according to claim 1, characterized in that, It also includes a top box (50), which is fixed to the top of the box support (10) and is used to display long-term fixed graphic content.

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