Optical fiber signal transmission stable photoelectric separation intermediate joint box

Abstract

The utility model relates to the ground wire ice melting technical field, and disclose a kind of photoelectric separation intermediate joint box of stable optical fiber signal transmission, including support insulator, the support insulator top is fixedly connected with composite insulator, the first insulator top is provided with box body, thread hole is opened between the box body and support insulator, the bolt is threadedly connected in the thread hole, the bolt surface is sleeved with spring washer.This photoelectric separation intermediate joint box of stable optical fiber signal transmission adopts "multistage sealing+same breathing closed cavity" design: box body and cable inlet conduit pass through threefold sealing of sealing gum, gum ring, maze structure;Optical cable clamp is sealed to OPGW optical unit by sealing nut, taper plug, taper plug;Box body inside and OPGW optical cable unit form pressure consistent closed cavity, completely block water vapor to enter, avoid optical fiber signal attenuation, interruption due to damp, from root guarantee signal transmission quality.

Description

Technical Field

[0001] This utility model relates to the field of ground wire de-icing technology, specifically to a photoelectric separation intermediate connector box for stable optical fiber signal transmission. Background Technology

[0002] Ice accumulation on transmission lines poses a significant threat to the power system: excessively thick ice buildup increases the mechanical load and wind resistance on conductors and ground wires, easily leading to mechanical faults such as line breaks, tower overturning, insulator string flipping or rupture, and conductor galloping; in terms of electrical performance, increased sag can cause gap breakdown and flashover accidents, seriously endangering the safe and stable operation of the power grid. Since the founding of the People's Republic of my country, several major ice storms have occurred, with the Hunan power grid suffering four major losses due to severe ice accumulation being particularly prominent. Following the 2008 ice storm in southern China, ice-melting technology has been widely applied to lines in heavily iced areas.

[0003] Currently, commonly used methods for dealing with icing include power outage de-icing, load transfer de-icing, manual de-icing, and AC / DC de-icing. Among these, the ground wire DC de-icing method has become the most widely used and most effective ground wire de-icing technology in China due to its advantages of high efficiency, economy, and ease of operation, and is gradually becoming the mainstream development direction. However, traditional full-line insulation de-icing methods have problems such as low control accuracy of the de-icing section, easy ground wire jumping during the de-icing process, and safety risks, and the power loss is relatively large in the daily tower-by-tower grounding operation mode. To address these issues, the fixed-section active DC de-icing technology has emerged, achieving precise control of the de-icing process and improving operational energy efficiency, and has become a key technology route for promotion.

[0004] Implementing segmented active DC de-icing requires targeted modifications to the power lines: photoelectric separation devices need to be installed in the intermediate sections of the OPGW optical cable ground wire. These devices physically isolate optical and electrical signals at the segmentation points. While ensuring uninterrupted optical communication, they can autonomously switch the DC power circuit on or off according to de-icing needs, thus balancing the requirements of normal operation and de-icing. Therefore, there is an urgent need to develop new high-performance photoelectric separation devices to support the engineering application of segmented active DC de-icing systems and further improve the power grid's resistance to ice storms and operational reliability. Utility Model Content

[0005] The purpose of this invention is to provide a photoelectric separation intermediate junction box for stable optical fiber signal transmission, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a photoelectric separation intermediate junction box for stable optical fiber signal transmission, comprising a supporting insulator, wherein a composite insulator is fixedly connected to the top of the supporting insulator, and a box body is provided on the top of the first insulator; A threaded hole is provided between the box body and the supporting insulator. A bolt is threaded into the threaded hole. A spring washer is fitted onto the surface of the bolt. The spring washer is located at the bottom of the box body. A box cover is fixedly connected to the top of the box body.

[0007] Preferably, cable inlet conduits are fixedly connected to both sides of the box. The connection end of the cable inlet conduit to the box body is provided with an inner conical hole and a sealing nut for storing sealing material. The cable inlet conduit and the box body are reinforced and fixedly connected by pipe threads and flanges, employing a triple seal of sealant, rubber ring, and labyrinth structure. The other end of the cable inlet conduit is connected to a through-hole DC insulator, reinforced and sealed by a positioning flange and sealing ring. The cable inlet conduits on both sides of the box body are used to introduce OPGW optical cables. The inner conical hole and sealing nut at the connection end with the box body allow for the storage of sealing material, and the reinforced and fixed connection with the box body by pipe threads and flanges, along with the triple seal of sealant, rubber ring, and labyrinth structure, ensures the airtightness of the connection and prevents moisture from entering the box body. The other end of the cable inlet conduit is connected to a through-hole DC insulator, reinforced by a positioning flange and sealing ring, further ensuring the airtightness and stability of the entire system.

[0008] Preferably, a through-hole DC insulator is fixedly connected to the side of the cable inlet conduit away from the housing. A fiber optic cable clamp is fixedly connected to the left side of the through-hole DC insulator, and a protective tube is fitted onto the surface of the right-side through-hole DC insulator. The through-hole DC insulator has a hollow structure and is used for insulation between OPGW fiber optic cables to prevent electrical interference. The connecting hardware at both ends is connected to the cable inlet conduit and the fiber optic cable clamp, respectively. When the hardware is connected to the fiber optic cable clamp, it is fixed by pipe threads, and the seal is strengthened by flanges and sealing rings to ensure insulation performance and connection reliability.

[0009] Preferably, the housing is used for splicing, storing, and protecting fiber optic units of at least two OPGW optical cables. The housing contains fiber optic fixing feet, and a bracket in the middle for mounting a fiber storage tray. The fiber storage tray has a structure for storing and fixing secondary redundant optical fibers. The tray contains a wire groove for fixing and protecting the fiber optic splice joint. Internal accessories are configured within the tray for fixing, sealing, and protecting exposed optical fibers after splicing. The housing has an interface for introducing fiber optic units. OPGW optical cable supports and insulation components are installed at the interface. The optical cable clamp on the left side of the through-hole DC insulator is used to fix the introduced OPGW optical cable. The other end is sealed with sealing nuts, cone plugs, and cone seals to seal the optical units in the OPGW optical cable, forming a sealed channel with the through-hole DC insulator and the cable guide tube for fixing the optical cable and introducing the optical units into the housing. The protective tube sleeved on the surface of the right through-hole DC insulator is used to protect the through-hole DC insulator and the optical cable clamp from external mechanical damage.

[0010] Preferably, the OPGW optical cable support and insulation assembly is used to fix the OPGW optical cable and guide the fiber optic units in the OPGW into the housing for splicing. The housing is used for splicing, storing, and protecting the fiber optic units of at least two OPGW optical cables. Fiber optic fixing feet inside the housing are used to fix the optical fibers and prevent them from shaking. The bracket in the middle of the housing is used to install a fiber storage tray. The fiber storage tray has a structure for storing and fixing secondary redundant optical fibers. Its internal grooves are used to fix and protect the fiber optic splice joints. Internal accessories configured within the fiber storage tray are used for fixing, sealing, and protecting exposed optical fibers after splicing, ensuring the reliability and stability of the fiber optic splice joints.

[0011] Preferably, the through-hole DC insulator is a hollow DC insulator used for insulation between OPGW optical cables. The two ends of the through-hole DC insulator are connecting hardware, which are respectively connected to the cable inlet conduit and the optical cable clamp. When the hardware is connected to the optical cable clamp, it is fixed by pipe thread and reinforced and sealed by flange and sealing ring. The OPGW optical cable support and insulation assembly is used to fix the OPGW optical cable and guide the optical fiber unit in the OPGW into the box for splicing, ensuring the fixation of the optical cable and the smooth introduction of the optical fiber unit, while also playing an insulating role to prevent electrical interference.

[0012] Preferably, one end of the optical cable clamp is connected to the through-hole DC insulator, and the other end is used to fix the introduced OPGW. The optical units in the OPGW optical cable are sealed by sealing nuts, cone plugs, and cone plug seals. The optical cable clamp, the through-hole DC insulator, and the cable inlet conduit form a sealed channel for fixing the optical cable and the optical units to be introduced into the junction box. The junction box and the OPGW optical cable are sealed in multiple stages to make the air pressure inside the junction box the same as that of the optical units in the OPGW optical cable. The optical units in the OPGW optical cable and the junction box together form a complete breathing sealed cavity to prevent moisture from entering and affecting the optical fiber signal transmission, thereby further improving the stability and reliability of the optical fiber signal transmission.

[0013] Preferably, the housing and the OPGW optical cable are sealed through multiple levels. The air pressure inside the junction box is the same as that of the optical cable unit of the OPGW optical cable. The optical unit in the OPGW optical cable and the junction box together form a complete airtight cavity to prevent moisture from entering and affecting the transmission of optical fiber signals.

[0014] Compared with the prior art, this utility model provides a photoelectric separation intermediate junction box for stable optical fiber signal transmission, which has the following beneficial effects: 1. This optical fiber signal transmission stable optoelectronic separation intermediate junction box adopts a "multi-level sealing + breathable sealed cavity" design: the box body and the cable inlet conduit are triple-sealed by sealant, rubber ring and labyrinth structure; the optical cable clamp is sealed to the OPGW optical unit by sealing nut, cone plug and cone plug; the inside of the box body and the OPGW optical cable unit form a sealed cavity with the same pressure, completely blocking the entry of water vapor and avoiding optical fiber signal attenuation and interruption caused by moisture, thus ensuring the signal transmission quality from the source.

[0015] 2. This optical fiber signal transmission stable optoelectronic separation intermediate junction box can realize the splicing, storage and protection of optical fiber units of no less than two OPGW optical cables. The box is equipped with optical fiber fixing feet, fiber storage trays and cable trays: the fixing feet prevent the optical fiber from shaking and misaligning, the fiber storage tray can store and fix secondary redundant optical fibers, and the cable trays are specially designed to protect the optical fiber fusion splice. Together with the internal accessories, the exposed optical fiber is fixed and sealed after fusion splicing to avoid stress, wear or oxidation at the splice point, and ensure low signal attenuation transmission at the optical fiber splice.

[0016] 3. The optoelectronic separation intermediate junction box with stable fiber optic signal transmission features a hollow structure for the through-hole DC insulator, which is specifically designed to achieve insulation between OPGW optical cables, prevent electrical signals from interfering with optical signals during DC de-icing, and avoid the transmission of electrical faults between optical cables, ensuring uninterrupted optical communication and independent controllability of the DC power circuit during de-icing.

[0017] 4. This optical fiber signal transmission stable optoelectronic separation intermediate joint box allows for multiple splicing and coiling lengths during optical cable installation. The steps for steel pipe cutting, optical fiber insertion, and heat shrink fixing are clear and adaptable to on-site construction needs. The box body and supporting insulators are connected by bolts and spring washers, making disassembly and assembly convenient and facilitating later maintenance.

[0018] 5. The optoelectronic separation intermediate junction box with stable fiber optic signal transmission adopts a reinforced fixing structure for all connection parts (such as bolts and spring washers, pipe threads and flanges) to prevent loosening caused by vibration during long-term operation; the sealing components (sealing rings, sealant, cone plugs, etc.) are highly durable and can maintain the sealing effect for a long time, reducing the frequency of maintenance due to component aging, reducing power grid operation and maintenance costs, and ensuring the long-term stable operation of transmission lines in heavy icing areas. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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. Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is a schematic diagram of a composite insulator structure; Figure 4 This is a schematic diagram of a through-hole DC insulator.

[0020] In the diagram: 1. Composite insulator; 2. Bolt; 3. Spring washer; 4. Box; 5. Cable inlet conduit; 6. Optical cable clamp; 7. Through-hole DC insulator; 8. Box cover; 9. Protective tube; 10. Support insulator. Detailed Implementation

[0021] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] This utility model provides a technical solution: Example

[0023] Combination Figures 1 to 2 A photoelectric separation intermediate junction box for stable optical fiber signal transmission includes a supporting insulator 10, a composite insulator 1 fixedly connected to the top of the supporting insulator 10, and a box body 4 provided on the top of the first insulator. A threaded hole is provided between the box body 4 and the supporting insulator 10. A bolt 2 is threaded into the threaded hole. A spring washer 3 is sleeved on the surface of the bolt 2. The spring washer 3 is located at the bottom of the box body 4. A box cover 8 is fixedly connected to the top of the box body 4.

[0024] Furthermore, cable inlet conduits 5 are fixedly connected to both sides of the housing 4. The connection end of the cable inlet conduit 5 to the housing 4 is equipped with an inner conical hole and a sealing nut for storing sealing material. The cable inlet conduit 5 and the housing 4 are reinforced and fixedly connected by pipe threads and flanges, employing a triple seal of sealant, rubber rings, and a labyrinth structure. The other end of the cable inlet conduit 5 is connected to the through-hole DC insulator 7, and is reinforced and sealed by a positioning flange and a sealing ring. The cable inlet conduits 5 on both sides of the housing 4 are used to introduce OPGW optical cables. Their connection end to the housing 4 is equipped with an inner conical hole and a sealing nut for storing sealing material, and is reinforced and fixedly connected to the housing 4 by pipe threads and flanges, employing a triple seal of sealant, rubber rings, and a labyrinth structure to ensure the airtightness of the connection and prevent moisture from entering the interior of the housing 4. The other end of the cable inlet conduit 5 is connected to the through-hole DC insulator 7, and the seal is reinforced by a positioning flange and a sealing ring, further ensuring the airtightness and stability of the entire system.

[0025] Furthermore, a through-hole DC insulator 7 is fixedly connected to the side of the cable inlet conduit 5 away from the box body 4. A fiber optic cable clamp 6 is fixedly connected to the left side of the left-side through-hole DC insulator 7, and a protective tube 9 is fitted onto the surface of the right-side through-hole DC insulator 7. The through-hole DC insulator 7 has a hollow structure and is used for insulation between OPGW fiber optic cables to prevent electrical interference between them. The connecting hardware at both ends is connected to the cable inlet conduit 5 and the fiber optic cable clamp 6, respectively. When the hardware is connected to the fiber optic cable clamp 6, it is fixed by pipe threads, and the seal is strengthened by flanges and sealing rings to ensure insulation performance and connection reliability.

[0026] Furthermore, the housing 4 is used for splicing, storing, and protecting fiber optic units of no less than two OPGW optical cables. The housing 4 is equipped with fiber optic fixing feet and a bracket in the middle for installing a fiber storage tray. The fiber storage tray has a structure for storing and fixing secondary redundant optical fibers. The fiber storage tray is equipped with a wire groove for fixing and protecting the fiber optic fusion splice joint. The fiber storage tray is equipped with internal accessories for fixing, sealing, and protecting the exposed optical fibers after fusion splicing. The housing 4 is designed with an interface for introducing fiber optic units. OPGW optical cable support and insulation components are installed at the interface. The optical cable clamp 6 on the left side of the through-hole DC insulator 7 is used to fix the introduced OPGW optical cable. The other end is sealed with sealing nuts, cone plugs, cone plugs, and other sealing components to seal the optical units in the OPGW optical cable. Together with the through-hole DC insulator 7 and the cable inlet conduit 5, they form a sealed channel for fixing the optical cable and introducing the optical units into the housing 4. The protective tube 9 sleeved on the surface of the DC insulator 7 with through hole on the right side is used to protect the DC insulator 7 with through hole and the optical cable clamp 6 to prevent them from being damaged by external mechanical forces. Example

[0027] See Figure 3-4 Based on Embodiment 1, an OPGW optical cable support and insulation assembly is further provided. This assembly is used to fix the OPGW optical cable and guide the fiber optic units in the OPGW into housing 4 for splicing. Housing 4 is used for splicing, storing, and protecting fiber optic units of at least two OPGW optical cables. Fiber optic fixing feet inside housing 4 are used to fix the fiber optics and prevent them from shaking. The bracket in the middle of housing 4 is used to install a fiber storage tray. The fiber storage tray has a structure for storing and fixing secondary redundant fibers. Its internal grooves are used to fix and protect the fiber optic fusion splice. Internal accessories configured within the fiber storage tray are used for fixing, sealing, and protecting exposed fibers after fusion splicing, ensuring the reliability and stability of the fiber optic fusion splice.

[0028] Furthermore, the through-hole DC insulator 7 is a hollow DC insulator used for insulation between OPGW optical cables. The two ends of the through-hole DC insulator 7 are connecting hardware, which are connected to the cable inlet conduit 5 and the optical cable clamp 6 respectively. When the hardware is connected to the optical cable clamp 6, it is fixed by pipe thread and reinforced and sealed by flange and sealing ring. The OPGW optical cable support and insulation components are used to fix the OPGW optical cable and introduce the optical fiber unit in the OPGW into the box 4 for splicing, ensuring the fixation of the optical cable and the smooth introduction of the optical fiber unit, while also playing an insulating role to prevent electrical interference.

[0029] Furthermore, one end of the optical cable clamp 6 is connected to the through-hole DC insulator 7, and the other end is used to fix the introduced OPGW. The optical units in the OPGW optical cable are sealed by sealing nuts, cone plugs, and cone plug seals. The optical cable clamp 6, the through-hole DC insulator 7, and the cable inlet conduit 5 form a sealed channel for fixing the optical cable and introducing the optical units into the junction box 4. The junction box 4 and the OPGW optical cable are sealed in multiple stages to make the air pressure inside the junction box the same as that of the optical cable units in the OPGW optical cable. The optical units in the OPGW optical cable and the junction box together form a complete breathable sealed cavity to prevent water vapor from entering and affecting the optical fiber signal transmission, thereby further improving the stability and reliability of optical fiber signal transmission.

[0030] Furthermore, the junction box 4 and the OPGW optical cable are sealed in multiple stages. The air pressure inside the junction box is the same as that of the optical cable unit of the OPGW optical cable. The optical unit in the OPGW optical cable and the junction box together form a complete airtight cavity to prevent moisture from entering and affecting the transmission of optical fiber signals.

[0031] In actual operation, when using this device, first determine a suitable installation location to fix the junction box, straighten the OPGW optical cable path, and leave enough length to allow for multiple fusion splicing operations and coiling. Mark the location of the determined length of the optical cable and wrap it with tape to prevent stranding during subsequent processing. Then, use a fine-toothed hacksaw or side-cutting pliers to cut off the outer monofilament of the OPGW optical cable, retaining the stainless steel tube, and do not damage the stainless steel tube unit, including cuts and kinks. The cut wire end face should be flush, and a conical plug should be placed on the stainless steel tube. Cut the steel tube at a distance of about 120mm from the cut end face. Cut the steel pipe with a knife, being careful to prevent deformation and breakage. If the sharp edge gets on the optical fiber, gently remove the steel pipe. Insert an inner liner and a fiber optic tube (approximately 10-15mm long) into the stainless steel pipe, respectively. Clean the surface grease of the optical fiber with an anhydrous alcohol cotton ball. Pass the optical fiber through the fiber optic protection tube 9 and the heat shrink tubing in sequence. Insert the fiber optic protection tube 9, matching the diameter of the steel pipe, 20mm into the steel pipe, leaving approximately 30mm exposed. Cover with the heat shrink tubing and use a heat gun to shrink it, securing the fiber optic protection tube 9 to the steel pipe to protect the optical fiber from being scratched by the sharp edge of the steel pipe. Open the junction box cover 8 and remove the prepared OPG. Carefully insert the W cable through the center hole of the optical cable support and insulation components. At the optical cable clamp 6, tighten the pressure block to secure the OPGW optical cable, tighten the cap, and press the cone plug. Disconnect the stainless steel tube from the outside air again. Install the protective tube 9. Inside the box 4, insert the heat fusion tube into any one of the optical fibers to be connected, and then weld it. After welding, move the heat fusion tube so that the optical fiber welding point is in the center of the heat fusion tube. Heat the heat fusion tube to fuse it with the optical fiber, which enhances the protection of the welding point. Insert the heat fusion tubes into the wiring grooves respectively, and then evenly arrange the optical fibers in the fiber storage tray from bottom to top. After each section is operated, cover the cable and use an optical time domain reflectometer (OTDR) to test the two sections of optical cable to identify the impact of the installation process on the optical fiber. At the same time, record the optical fiber connection color, optical fiber length, attenuation, etc. Evenly coil the protective tube 9 containing redundant optical fiber on the support and fix it. Apply sealant to the inside of the optical cable conduit box 4 and press it tightly with the aluminum cap to seal it. Perform a secondary seal on the optical fiber unit. Clean the sealing area of ​​the connector box 4 and check that the sealing ring is intact. Cover the box and tighten the screws symmetrically until the gap between the box 4 and the box cover on the connector box is consistent and tightly connected.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A photoelectric separation intermediate junction box for stable optical fiber signal transmission, comprising a supporting insulator (10), characterized in that: The top of the supporting insulator (10) is fixedly connected to the composite insulator (1), and the top of the first insulator is provided with a box (4); A threaded hole is provided between the box body (4) and the supporting insulator (10). A bolt (2) is threadedly connected in the threaded hole. A spring washer (3) is sleeved on the surface of the bolt (2). The spring washer (3) is located at the bottom of the box body (4). A box cover (8) is fixedly connected to the top of the box body (4).

2. The optoelectronic splitter junction box for stable optical fiber signal transmission according to claim 1, characterized in that: Both sides of the box (4) are fixedly connected to cable inlet conduits (5). The cable inlet conduits (5) and the box (4) are provided with an inner conical hole and a sealing nut for storing sealing material. The cable inlet conduits (5) and the box (4) are reinforced and fixedly connected by pipe threads and flanges, and triple sealing is achieved by sealant, rubber ring and labyrinth structure. The other end of the cable inlet conduits (5) is connected to the through hole DC insulator (7), and is reinforced and sealed by positioning flange and sealing ring.

3. The optoelectronic separation intermediate junction box for stable optical fiber signal transmission according to claim 2, characterized in that: A through-hole DC insulator (7) is fixedly connected to the side of the cable inlet conduit (5) away from the box body (4). A fiber optic cable clamp (6) is fixedly connected to the left side of the through-hole DC insulator (7). A protective tube (9) is sleeved on the right side surface of the through-hole DC insulator (7).

4. The optoelectronic separation intermediate junction box for stable optical fiber signal transmission according to claim 1, characterized in that: The box (4) is used for splicing, storing and protecting optical fiber units of no less than two OPGW optical cables. The box (4) is provided with optical fiber fixing feet. The box (4) is provided with a bracket in the middle for installing a fiber storage tray. The fiber storage tray has a structure for storing and fixing secondary redundant optical fibers. The fiber storage tray is provided with a wire groove for fixing and protecting the optical fiber fusion splice. The fiber storage tray is equipped with internal accessories for fixing, sealing and protecting the exposed optical fibers after fusion splicing. The box (4) is designed with an interface for introducing optical fiber units. OPGW optical cable support and insulation components are installed at the interface.

5. The optoelectronic separation intermediate junction box for stable optical fiber signal transmission according to claim 4, characterized in that: The OPGW optical cable support and insulation assembly is used to fix the OPGW optical cable and to guide the optical fiber unit in the OPGW into the housing (4) for splicing.

6. The optoelectronic separation intermediate junction box for stable optical fiber signal transmission according to claim 3, characterized in that: The through-hole DC insulator (7) is a hollow DC insulator used for insulation between OPGW optical cables. The two ends of the through-hole DC insulator (7) are connecting hardware. The connecting hardware is connected to the cable inlet conduit (5) and the optical cable clamp (6) respectively. When the hardware is connected to the optical cable clamp (6), it is fixed by pipe thread and reinforced and sealed by flange and sealing ring.

7. The optoelectronic separation intermediate junction box for stable optical fiber signal transmission according to claim 6, characterized in that: One end of the optical cable clamp (6) is connected to the through-hole DC insulator (7), and the other end is fixed to the introduced OPGW. The optical unit in the OPGW optical cable is sealed by the sealing nut, cone plug and cone plug seal. The optical cable clamp (6), the through-hole DC insulator (7) and the cable inlet conduit (5) form a sealed channel for fixing the optical cable and the optical unit inlet box (4).

8. The optoelectronic separation intermediate junction box for stable optical fiber signal transmission according to claim 4, characterized in that: The box (4) and the OPGW optical cable are sealed in multiple stages. The air pressure inside the box is the same as that of the optical cable unit of the OPGW optical cable. The optical unit in the OPGW optical cable and the junction box together form a complete airtight cavity to prevent water vapor from entering and affecting the transmission of optical fiber signals.

Images