Tunnel lighting device

Abstract

This utility model provides a trench lighting device, relating to the field of lighting equipment technology. Specifically, it includes a control box, a light source assembly, a light-emitting optical fiber, a heat dissipation assembly, and a protective assembly. The control box is located outside the trench, and the light source assembly is located inside the control box. The light source assembly illuminates the space within the trench through a light-emitting optical fiber connected to the light-emitting point. The heat dissipation assembly cools the connection point between the light-emitting optical fiber and the light source assembly, preventing carbonization of the light-emitting optical fiber due to excessive temperature. The protective assembly secures the light-emitting optical fiber within the trench. In this trench lighting device, the electrical equipment and the light source assembly are located outside the trench via the control box, preventing contact between the electrical components and flammable or explosive gases within the trench. Furthermore, the connection point between the light-emitting optical fiber and the light source assembly is located outside the trench, preventing short circuits due to water seepage and extending the service life.

Description

Technical Field

[0001] This utility model relates to the field of lighting equipment technology, and more specifically, to a trench lighting device. Background Technology

[0002] Because leachate contains high concentrations of organic matter, heavy metals, and acidic and alkaline substances, traditional lighting equipment is easily corroded. Furthermore, the leachate channels are constantly damp or even flooded, creating a highly corrosive and humid environment where traditional lighting equipment is susceptible to corrosion. The leachate channels are underground spaces within waste treatment facilities used to collect and treat leachate, primarily for intercepting and discharging leachate generated from waste.

[0003] Since the trenches are often damp or even flooded, lighting equipment may short-circuit or leak electricity. In addition, some leachate may produce flammable and explosive gases such as methane, posing safety hazards to conventional electrical lighting. Currently, explosion-proof LED lights or waterproof lights are often installed between the trenches to provide illumination.

[0004] However, such lighting equipment still poses electrical risks during use, is prone to short circuits due to water seepage, and has a relatively short service life. Utility Model Content

[0005] The purpose of this utility model is to provide a trench lighting device to alleviate the technical problems of existing lighting devices, such as electrical risks during use, susceptibility to short circuits due to water seepage, and short service life.

[0006] This utility model provides a channel lighting device for use in leachate channels, comprising:

[0007] The control box is designed to be installed outside the trench.

[0008] A light source assembly is disposed inside the control box, and the light source assembly includes a connector disposed at the light emission point of the light source;

[0009] A light-emitting optical fiber is disposed on the connector and its front end is connected to the light-emitting part of the light source assembly. The end of the light-emitting optical fiber is used to be disposed in the channel.

[0010] A heat dissipation component is disposed in the control box and is used for heat dissipation at the front end of the light-emitting optical fiber and the light-emitting part of the light source component.

[0011] The protective assembly includes mounting brackets for installation on the wall between channels, the mounting brackets having fixing grooves through which the luminescent optical fiber passes, and multiple mounting brackets arranged sequentially along the extension direction between channels.

[0012] Furthermore, the protective assembly also includes a PC protective tube;

[0013] The PC protective tube is sleeved over the light-emitting optical fiber.

[0014] Furthermore, the protective component also includes a reflective structure;

[0015] The reflective structure is located on the side of the light-emitting optical fiber near the channel, and its extension direction is the same as the arrangement direction of the multiple mounting brackets.

[0016] Furthermore, the protective component also includes a transparent shield;

[0017] The transparent cover is mounted on multiple mounting brackets and encloses the light-emitting optical fiber and the reflective structure inside.

[0018] Furthermore, the mounting bracket includes a mounting part and a fixing part;

[0019] The mounting part is used to connect the sidewalls between the channels;

[0020] The fixing part is connected to the mounting part, and the fixing part is provided with a plurality of fixing grooves at intervals along the vertical direction;

[0021] There are multiple light-emitting optical fibers, and each of the multiple light-emitting optical fibers is inserted into one of the multiple fixed slots.

[0022] Furthermore, both the mounting part and the fixing part are made of stainless steel.

[0023] Furthermore, the light source assembly also includes a light source mechanism;

[0024] The light-emitting end of the light source is the light-emitting part of the light source assembly;

[0025] The connector is provided with a mounting hole, which is positioned opposite to the light-emitting end of the light source, and the light-emitting optical fiber passes through the mounting hole.

[0026] Furthermore, the heat dissipation component includes a temperature sensing element and a heat dissipation element;

[0027] The temperature sensing element is disposed on the connector and located on one side of the mounting hole;

[0028] The heat sink is located inside the control box and is electrically connected to the temperature sensing element. The heat sink faces the junction of the light-emitting optical fiber and the light source assembly.

[0029] Furthermore, the trench lighting device also includes a manual switch and a sensor;

[0030] The manual switch is located in the control box and is electrically connected to the light source assembly;

[0031] The sensors are multiple and are spaced apart along the extension direction of the channels.

[0032] Furthermore, the light-emitting optical fiber is a PMMA optical fiber.

[0033] Beneficial effects:

[0034] In this invention, the control box is located outside the trench, and the light source assembly is located inside the control box. During use, the light source assembly serves as the light source, and the light-emitting optical fiber connected to the light-emitting point acts as the light transmission medium. The end of the light-emitting optical fiber extends into the trench, and the light emitted by the light source assembly is transmitted through the light-emitting optical fiber, thereby illuminating the space within the trench. The heat dissipation assembly can dissipate heat and cool the connection point between the light-emitting optical fiber and the light source assembly, preventing excessive temperature from causing carbonization of the light-emitting optical fiber. The protective assembly can fix the light-emitting optical fiber in the trench. In the trench lighting equipment provided by this invention, the electrical equipment and the light source assembly are located outside the trench via the control box, preventing contact between the electrical components and flammable and explosive gases in the trench. Furthermore, the connection point between the light-emitting optical fiber and the light source assembly is located outside the trench, preventing short circuits due to water seepage, resulting in a longer service life. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the structure of the light source assembly in the trench lighting device provided in this embodiment of the utility model.

[0037] Figure 2 A schematic diagram showing the positional relationship between the light-emitting optical fiber and the PC protective tube in a trench lighting device provided in an embodiment of this utility model;

[0038] Figure 3 This is a schematic diagram of the protective component in the trench lighting device provided in this embodiment of the utility model.

[0039] icon:

[0040] 100-Light source assembly; 110-Connector; 111-Mounting hole; 120-Light source unit; 130-Heat sink; 200-Light-emitting fiber; 300-Protective assembly; 301-Fixing groove; 310-Mounting part; 320-Fixing part; 400-PC protective tube; 500-Reflective structure; 600-Transparent protective cover. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0048] See Figures 1 to 3 The channel lighting device provided in this embodiment is used for lighting leachate channels, and specifically includes a control box, a light source assembly 100, a light-emitting optical fiber 200, a heat dissipation assembly, and a protection assembly 300.

[0049] The control box is installed outside the trench. The light source assembly 100 is located inside the control box and includes a connector 110 at the light emission point of the light source. A light-emitting optical fiber 200 is located on the connector 110, with its front end connected to the light emission point of the light source assembly 100. The end of the light-emitting optical fiber 200 is installed inside the trench. A heat dissipation assembly is located in the control box and is used for heat dissipation between the front end of the light-emitting optical fiber 200 and the light emission point of the light source assembly 100. The protective assembly 300 includes mounting brackets for installation on the wall of the trench. The mounting brackets have fixing grooves 301 through which the light-emitting optical fiber 200 passes. Multiple mounting brackets are arranged sequentially along the extension direction of the trench.

[0050] Specifically, in this embodiment, the control box is located in the transition space outside the trench, and the light source assembly 100 is located inside the control box.

[0051] When illumination is required in the trench, the light source assembly 100 generates light as a light source, and the light-emitting optical fiber connected to the light-emitting end of the light source assembly 100 serves as the light transmission medium. The end of the light-emitting optical fiber 200 is disposed in the trench, and the light emitted by the light source assembly 100 is transmitted through the light-emitting optical fiber 200 to achieve illumination of the space in the trench.

[0052] During the lighting process, heat easily accumulates at the junction of the light-emitting optical fiber 200 and the light source assembly 100. The heat dissipation component can dissipate heat and cool down the junction of the light-emitting optical fiber 200 and the light source assembly 100, preventing the light-emitting optical fiber 200 from carbonizing due to excessive temperature at the junction. The protective component 300 can fix the light-emitting optical fiber 200 in the channel.

[0053] In the trench lighting equipment provided in this embodiment, the electrical equipment and the light source assembly 100 are installed outside the trench through a control box, which avoids contact between the electrical components and flammable and explosive gases in the trench. Furthermore, the connection between the light-emitting optical fiber 200 and the light source assembly 100 is located outside the trench, which avoids short circuits due to water seepage and results in a longer service life.

[0054] In this embodiment, the protective component 300 further includes a PC protective tube 400. The PC protective tube 400 is sleeved on the outside of the light-emitting optical fiber 200.

[0055] Specifically, in this embodiment, the PC tube is made of transparent material. In the highly corrosive and humid environment between channels, the PC protective tube 400 can provide additional physical and chemical protection for the light-emitting optical fiber 200 without affecting its illumination effect. The light-emitting optical fiber 200 is sleeved inside the PC protective tube 400, which can effectively isolate leachate, acidic and alkaline substances, and humid environments from direct contact, preventing corrosion or wear on the fiber surface, and avoiding fiber aging or performance degradation caused by water accumulation or moisture intrusion.

[0056] The PC protective tube 400 acts as an insulation barrier, further reducing the potential impact of flammable and explosive gases (such as methane) on the optical fiber and enhancing the overall safety of the lighting system. This helps maintain the optical transmission efficiency of the luminous fiber 200, reduces the risk of failure caused by environmental factors, thereby extending the service life of the equipment and reducing maintenance frequency.

[0057] In this embodiment, the protective component 300 further includes a reflective structure 500. The reflective structure 500 is disposed on the side of the light-emitting optical fiber 200 near the channel, and its extension direction is the same as the arrangement direction of the multiple mounting brackets.

[0058] When the light-emitting optical fiber 200 illuminates the channel, the reflective structure 500 can effectively collect and reflect the light to the target area (such as the bottom or sidewall of the channel), thereby improving the utilization efficiency and illumination uniformity of the light. This allows the limited light source energy to be more concentrated and effectively illuminate the key areas, improving the overall lighting effect between the channels.

[0059] Furthermore, in this embodiment, the reflective structure 500 is arranged along the extension direction of the channel to form a continuous and uniform lighting band, reducing blind spots and thus meeting the lighting needs of narrow and elongated channels. This embodiment achieves enhanced lighting effect through physical reflection using the reflective structure 500, further improving the reliability and energy efficiency of the equipment in harsh environments.

[0060] Specifically, in this embodiment, the reflective structure 500 is made of 316L stainless steel polished plate and is set at an angle to reflect light.

[0061] In this embodiment, the protective component 300 further includes a transparent shield 600. The transparent shield 600 is disposed on a plurality of mounting brackets and encloses the light-emitting optical fiber 200 and the reflective structure 500.

[0062] The transparent protective cover 600 forms a physical isolation barrier around the light-emitting optical fiber 200 and the reflective structure 500, thereby isolating them from high-humidity air, leachate splashes or water vapor condensation, and corrosive substances within the trench. It also prevents damage to the light-emitting optical fiber 200 and the reflective structure 500 due to collisions, ensuring the long-term stability of the light-emitting optical fiber 200 and the reflective structure 500 in harsh environments.

[0063] Meanwhile, the transparent cover 600 allows for efficient light transmission with virtually no impact on lighting performance. This reduces the risk of fiber optic aging, reflective layer failure, or structural damage caused by environmental corrosion, further extending the lifespan of internal lighting components within the trench and reducing maintenance requirements.

[0064] In this embodiment, the mounting bracket includes a mounting portion 310 and a fixing portion 320. The mounting portion 310 is used to connect to the sidewalls between the channels. The fixing portion 320 is connected to the mounting portion 310, and a plurality of fixing slots 301 are provided at intervals along the vertical direction on the fixing portion 320. There are multiple light-emitting optical fibers 200, and the multiple light-emitting optical fibers 200 are correspondingly inserted into the multiple fixing slots 301.

[0065] The vertically spaced arrangement of multiple light-emitting optical fibers 200 allows the light source to cover a larger vertical depth range between channels, thus overcoming the limitation of the limited illumination range of a single optical fiber and improving the uniformity and coverage of illumination in the vertical direction throughout the entire channel.

[0066] Furthermore, with multiple independent light-emitting optical fibers operating in parallel (200 in total), even if a small number of fibers are accidentally damaged or experience performance degradation, the remaining fibers can still continue to provide illumination, improving the redundancy and reliability of the entire lighting system. Simultaneously, the number and density of optical fibers can be flexibly configured according to the channel depth and lighting requirements.

[0067] In addition, the fixing slots 301 in this embodiment are arranged at intervals along the vertical direction, and each fixing slot 301 corresponds to an optical fiber, so that each optical fiber can be independently and stably clamped and positioned at a predetermined height, preventing it from shifting, tangling or sagging in the channel due to vibration, water flow impact or maintenance activities, thus ensuring the stability and long-term effectiveness of the lighting optical path.

[0068] In this embodiment, both the mounting part 310 and the fixing part 320 are made of stainless steel.

[0069] Stainless steel possesses excellent corrosion resistance and high mechanical strength. In the harsh environment of the trench, characterized by high corrosion (leachate containing organic matter, acids, alkalis, and salts) and high humidity, the stainless steel mounting section 310 and fixing section 320 effectively resist corrosive media, preventing the support structure from weakening, deforming, or failing due to rust. This ensures a stable connection of the mounting bracket to the trench sidewall and long-term, reliable, and precise positioning of the light-emitting optical fiber 200 within the fixing groove 301. This guarantees the structural integrity and long-term stable operation of the entire trench lighting equipment under extreme conditions, further extending the service life of the bracket itself and the entire lighting system it supports.

[0070] In this embodiment, the light source assembly 100 further includes a light source unit 120. The light-emitting end of the light source unit 120 is the light-emitting point of the light source assembly 100. The connector 110 is provided with a mounting hole 111, which is disposed opposite to the light-emitting end of the light source unit 120, and the light-emitting optical fiber 200 passes through the mounting hole 111.

[0071] The light source unit 120 is the core light-emitting element of the trench lighting device provided in this embodiment. The mounting hole 111 on the connector 110 is precisely aligned with the light-emitting end of the light source unit 120, providing an accurate alignment channel for the light-emitting optical fiber 200. The light-emitting optical fiber 200 passes through the mounting hole 111, ensuring that its front end face can be stably, tightly, and accurately aligned with the light-emitting end of the light source unit 120. This optimizes the coupling efficiency of light from the light source unit 120 to the light-emitting optical fiber 200, minimizes light energy loss at the interface, and improves the overall light transmission efficiency.

[0072] Meanwhile, the stable positioning also avoids gaps or misalignments between the fiber end face and the light-emitting end of the light source 120 due to offset, vibration or loosening, reduces light energy loss and local heating caused by poor coupling, and helps maintain a stable operating temperature at the connection between the light source component 100 and the optical fiber, thereby ensuring lighting brightness and equipment lifespan.

[0073] In this embodiment, the light source 120 is specifically an LED light source 120. In this embodiment, the output power of the LED light source 120 is less than or equal to 12W, and it has a built-in multi-layer optical coupler.

[0074] In this embodiment, the heat dissipation assembly includes a temperature sensing element and a heat sink 130. The temperature sensing element is disposed on the connector 110 and located on one side of the mounting hole 111. The heat sink 130 is disposed inside the control box and electrically connected to the temperature sensing element, with the heat sink 130 facing the junction of the light-emitting optical fiber 200 and the light source assembly 100.

[0075] Specifically, in this embodiment, the temperature sensing element is positioned close to the mounting hole 111, enabling real-time and accurate monitoring of the temperature change at the junction of the front end of the light-emitting fiber 200 and the light-emitting end of the light source 120.

[0076] After receiving the temperature signal from the temperature sensor, the heat sink 130 actively operates, directing the generated cooling airflow or heat dissipation effect directly to the junction of the light-emitting optical fiber 200 and the light source assembly 100, thereby preventing excessive heat accumulation in this area and causing overheating. This avoids the risk of carbonization, melting, or performance degradation at the end of the light-emitting optical fiber 200 due to overheating, and also helps maintain the operating temperature of the light-emitting end of the light source 120 within a safe range, thereby improving the reliability and stability of the connection between the light source assembly 100 and the light-emitting optical fiber 200, ensuring the durability of the lighting effect and the service life of the equipment.

[0077] Specifically, in this embodiment, the trigger temperature of the heat sink 130 is 50°C, so that the temperature at the junction of the light-emitting optical fiber 200 and the light source assembly 100 does not exceed 55°C, thus preventing fiber carbonization. The heat sink 130 is specifically an axial flow fan, with the blades of the axial flow fan facing the junction of the light source assembly 100 and the light-emitting optical fiber 200. The airflow generated by the axial flow fan is parallel to the fan axis, forming a concentrated and directional high-speed airflow jet to achieve stable and excellent heat dissipation.

[0078] In this embodiment, the trench lighting equipment also includes a manual switch and sensors. The manual switch is located in a control box and electrically connected to the light source assembly 100. Multiple sensors are provided and spaced apart along the extension direction of the trenches.

[0079] The manual switch is located in a safe and dry control box, providing operators with a convenient way to manually turn the lighting equipment on or off from outside the trench. When staff need to enter the trench, they can manually turn on the trench lighting equipment before entering to keep it in a normally open state.

[0080] Furthermore, the multiple sensors in this embodiment are arranged at intervals along the length of the trench, effectively covering different sections between the trenches. The sensors (such as infrared sensors, microwave sensors, or sound sensors; specifically, infrared sensors in this embodiment) can detect the activity of personnel or vehicles within the trenches. When a person or vehicle is detected entering its sensing area, the sensor triggers a signal to automatically turn on the lighting in the corresponding area. After a preset delay, the lighting automatically turns off once the person or vehicle has left. This structure reduces the ineffective working time of the light source component 100 in unmanned / vehicle-free conditions, avoiding energy waste. Simultaneously, by reducing the overall operating time and frequency of the light source component 100, the workload of the light source component 100 and the heat dissipation component is effectively reduced, slowing down the aging process of the equipment.

[0081] In this embodiment, the light-emitting optical fiber 200 is a PMMA optical fiber.

[0082] PMMA optical fiber possesses excellent flexibility, impact resistance, and good resistance to moisture and chemical corrosion. When applied in highly corrosive and high-humidity environments such as leachate channels, PMMA optical fiber can effectively resist the erosion of acidic and alkaline substances, organic matter, and moisture in the leachate, preventing the optical fiber material from aging rapidly, becoming embrittled, or experiencing a decrease in light transmittance due to environmental factors.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A trench lighting device, characterized in that, Applications in leachate channels include: The control box is designed to be installed outside the trench. A light source assembly (100) is disposed inside the control box, and the light source assembly (100) includes a connector (110) disposed at the light emission point of the light source; A light-emitting optical fiber (200) is disposed on the connector (110) and its front end is connected to the light-emitting part of the light source assembly (100). The end of the light-emitting optical fiber (200) is used to be disposed in the channel. A heat dissipation assembly is provided in the control box and is used for heat dissipation at the front end of the light-emitting optical fiber (200) and the light-emitting part of the light source assembly (100). The protective component (300) includes a mounting bracket for installation on the wall between the channels, the mounting bracket having a fixing groove (301) through which the light-emitting optical fiber (200) passes, and the mounting bracket having multiple brackets for sequential arrangement along the extension direction between the channels.

2. The trench lighting device according to claim 1, characterized in that, The protective assembly (300) also includes a PC protective tube (400); The PC protective tube (400) is sleeved on the outside of the light-emitting optical fiber (200).

3. The trench lighting device according to claim 2, characterized in that, The protective component (300) also includes a reflective structure (500); The reflective structure (500) is located on the side of the light-emitting optical fiber (200) near the channel, and its extension direction is the same as the arrangement direction of the plurality of mounting brackets.

4. The trench lighting device according to claim 3, characterized in that, The protective component (300) also includes a transparent shield (600); The transparent cover (600) is disposed on a plurality of the mounting brackets and encloses the light-emitting optical fiber (200) and the reflective structure (500) inside.

5. The trench lighting device according to any one of claims 1-4, characterized in that, The mounting bracket includes a mounting part (310) and a fixing part (320); The mounting part (310) is used to connect the sidewalls between the channels; The fixing part (320) is connected to the mounting part (310), and the fixing part (320) is provided with a plurality of fixing grooves (301) at intervals along the vertical direction; There are multiple light-emitting optical fibers (200), and each of the multiple light-emitting optical fibers (200) is inserted into one of the multiple fixed slots (301).

6. The trench lighting device according to claim 5, characterized in that, Both the mounting part (310) and the fixing part (320) are made of stainless steel.

7. The trench lighting device according to claim 1, characterized in that, The light source assembly (100) also includes a light source unit (120); The light-emitting end of the light source (120) is the light-emitting part of the light source assembly (100); The connector (110) is provided with a mounting hole (111), which is positioned opposite to the light-emitting end of the light source (120), and the light-emitting optical fiber (200) passes through the mounting hole (111).

8. The trench lighting device according to claim 7, characterized in that, The heat dissipation component includes a temperature sensing element and a heat dissipation element (130); The temperature sensing element is disposed on the connector (110) and located on one side of the mounting hole (111); The heat sink (130) is located inside the control box and electrically connected to the temperature sensing element. The heat sink (130) faces the junction of the light-emitting optical fiber (200) and the light source assembly (100).

9. The trench lighting device according to claim 1, characterized in that, The trench lighting equipment also includes a manual switch and a sensor; The manual switch is located in the control box and is electrically connected to the light source assembly (100); The sensors are multiple and are spaced apart along the extension direction of the channels.

10. The trench lighting device according to claim 1, characterized in that, The light-emitting optical fiber (200) is a PMMA optical fiber.

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