Buried optical cable cross-connecting box free of fiber jumper

Abstract

The utility model discloses a jumper fiber-free buried optical cable cross-connecting box, which comprises an outer box body, an inner box body and a support frame, and the inner box body is internally provided with a direct melting area, a trunk area, a wiring area and a parking area. The trunk area is composed of a 12-core jumper-free tail fiber leading-out tray and comprises a tail fiber and a fiber melting disc, the fiber melting disc is used for welding a trunk optical cable and the tail fiber and leading out the fixed-length tail fiber after welding, the tail fiber led out by the fiber melting disc is in jumper connection with the 12-core integrated tray of the wiring area according to needs, and the tail fiber which is not used is fixed in the parking area. According to the utility model, a fiber jumper-free structure is combined with the buried optical cable cross-connecting box, according to the installation characteristics of the buried optical cable cross-connecting box, the layout of the panel of the box body is optimized, and the fiber jumper-free structure design is adopted, so that the operation of the buried optical cable cross-connecting box is facilitated, the service opening and maintenance efficiency is improved, the failure rate is greatly reduced, and the optical fiber transmission loss is reduced. The jumper-fiber-free structure in the inner box body enables the optical cables to be conveniently connected and distributed.

Description

Technical Field

[0001] The utility model relates to the technical field of communication equipment, in particular to an underground optical cable junction box without fiber jumper. Background Art

[0002] Optical cable junction boxes are crucial line equipment in optical cable networks, widely used at all levels of optical networks. They perform optical cable splicing, distribution, and resource scheduling at the backbone and distribution layers. They provide a centralized location for managing, allocating resources, and protecting optical cables, while also facilitating their connection and distribution. An optical cable junction box typically consists of a protective housing equipped with trays and other components within them, including active connectors. These components allow one optical cable to connect to another or multiple cables, enabling signal transmission and distribution.

[0003] Traditional fiber optic cable junction boxes are typically floor-mounted, occupying ground space. Because they are not integrated into road and municipal planning, their construction is somewhat haphazard. This results in the consumption of land resources, the deterioration of urban appearance, the impact on public travel, traffic obstruction, high equipment damage rates, and safety hazards, which do not meet the requirements of modern urban development. Due to the space constraints of fiber optic junction boxes, the installation of new ground-based fiber optic junction boxes in urban areas is difficult. Even in some hotspots, the preservation of existing boxes is difficult. Therefore, fiber optic junction boxes cannot meet the development needs of fiber optic cable services.

[0004] The above problems can be effectively solved by burying the optical cable junction box underground (underground optical cable junction box). The underground optical junction box provides protection through the outer box body and dust and water resistance through the inner box body, realizing the application scenario requirements of placing the traditional above-ground optical cable junction box underground. After construction, the underground optical cable box manhole cover is flush with the ground, achieving the effect of "hiding" the optical junction box and improving the aesthetics of urban space. The application and promotion of underground optical cable junction boxes can effectively solve the problems of traditional optical cable junction boxes occupying land resources, affecting the city appearance and traffic safety.

[0005] Existing underground optical cable junction boxes use conventional optical jumpers to achieve fiber optic patching. The backbone layer optical cables and the distribution layer optical cables are fusion-spliced ​​separately in 12-core integrated trays, and then optical jumpers are used to plug them into different integrated tray adapters as needed. This method has high line transmission loss and many fault points. In addition, the optical jumpers are brought by engineering personnel when the service is activated, and the jumpers vary in length, which can easily cause wiring confusion and inconvenience in subsequent construction and maintenance. The main reason is that the existing underground optical cable junction boxes use the internal layout of ordinary optical cable junction boxes, without redesigning the internal panel layout for the special underground environment, resulting in low space utilization and equipment capacity. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide an underground optical cable junction box with an improved structure that can avoid fiber jumpers.

[0007] To achieve the above-mentioned purpose, the utility model provides an underground optical cable junction box without jumpering, which is characterized in that it includes an outer box body, an inner box body and a support frame, wherein the inner box body is provided with a direct melting area, a trunk area, a distribution area and a parking area, and the trunk area is composed of a 12-core jumper-free pigtail lead-out tray, including a pigtail and a splice tray, and the splice tray is used for splicing the trunk optical cable and the pigtail, and leading out the fixed-length pigtail after splicing, and the pigtail led out by the splice tray is jumpered with the 12-core integrated tray in the distribution area as needed, and the unused pigtail is fixed in the parking area.

[0008] Furthermore, an optical cable introduction area is provided at the bottom of the inner box, and an optical cable stripping and fixing plate is provided in the optical cable introduction area. After the trunk optical cable is fixed on the optical cable stripping and fixing plate, a part of the core optical fibers are welded with the trunk area as needed, and the other part is directly welded with the distribution optical cable in the direct welding area as needed.

[0009] Furthermore, after the distribution optical cable is fixed on the cable stripping and fixing plate, a portion of the optical fibers can enter the distribution area and be fused with the 12-core integrated tray, and the other portion can enter the direct fusion area and be directly fused with the trunk optical cable.

[0010] Furthermore, the 12-core integrated tray includes a tray body and a cover plate. The tray body includes a fusion protection plate and a cable winding unit. Twelve adapters are fixedly connected to the tray body. One end of the adapter is used to fix the active connector, and the other end is used to plug in the pigtails led out of the main area fiber splicing tray.

[0011] Furthermore, the movable connector has a second pigtail, and a plurality of optical fiber hot-melt tube protection slots are provided on the fusion protection plate. The second pigtail is fused with the distribution optical cable and fixed on the optical fiber hot-melt tube protection slot; the cable winding unit includes a plurality of staggered card posts provided on the tray body, and the second pigtail and the distribution optical cable are wound in the 12-core integrated tray and are wound and fixed by the card posts.

[0012] Furthermore, the outer box is placed in the foundation pit, and the outer box and the inner box are movably connected by a support frame. The support frame includes two groups of air springs and positioning brackets. A group of air springs and positioning brackets are provided on the left and right sides of the outer box and the inner box. When the inner box is lifted from a horizontal state, it is assisted by the air springs. At the same time, the inner box is fixed at a set working angle by a fixed angle positioning unit provided on the positioning bracket, forming multiple working postures between 0-90°.

[0013] Furthermore, a support base is provided on the connecting side wall of the inner box body, and the support base is movably connected to the fixed side wall of the outer box body.

[0014] Furthermore, the fixed side wall of the outer box body is provided with a vertical reinforcement column, the upper end of the vertical reinforcement column is hinged to the end of the support seat, and the inner box body performs a flipping movement with the hinged portion as the center point.

[0015] Furthermore, the air spring is provided between the middle portion of the vertical reinforcement column and the lower portion of the support seat.

[0016] Furthermore, the fixed angle positioning unit is provided between the middle portion of the vertical reinforcement column and the lower portion of the support seat.

[0017] This utility model combines a jumper-free structure with an underground optical cable junction box. Based on the structural characteristics of the underground optical cable junction box, the jumper-free design is optimized, greatly facilitating the operation of the underground optical cable junction box. The jumper-free structure within the inner box allows for easy connection and distribution of optical cables. The connector design and layout can accommodate different types and specifications of optical cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the internal structure of the inner box;

[0019] Figure 2 for Figure 1 Middle AA section view;

[0020] Figure 3 This is a schematic diagram of the structure of the utility model;

[0021] Figure 4 Schematic diagram of the inner box in the open state Figure 1 ;

[0022] Figure 5 Schematic diagram of the inner box in the open state Figure 2 ;

[0023] Figure 6 Schematic diagram of the three-dimensional structure of the inner box when it is opened Figure 1 ;

[0024] Figure 7 Schematic diagram of the three-dimensional structure of the inner box when it is opened Figure 2 ;

[0025] Figure 8 for Figure 7 Enlarged view of middle part B;

[0026] Figure 9 This is a schematic diagram of the installation structure of the utility model;

[0027] Figure 10 This is a schematic diagram of the main view of the 12-core integrated tray structure;

[0028] Figure 11 This is a bottom-up schematic diagram of the 12-core integrated tray structure;

[0029] Figure 12 This is a schematic diagram of the internal structure of the tray body;

[0030] Figure 13 This is a schematic diagram of the internal structure of a 12-core integrated tray;

[0031] Figure 14 This is another structural diagram of the 12-core integrated tray. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] 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., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0036] like Figures 1 to 14As shown, the utility model is a fiber jumper-free buried optical cable junction box, comprising an outer box body 1, an inner box body 2 and a support frame 3, wherein the inner box body 2 is provided with a straight melting area 17, a trunk area 18, a distribution area 19 and a parking area 20, the straight melting area 17 and the trunk area 18 are arranged at the upper part of the inner box body 2, the distribution area 19 is arranged directly below the trunk area 18, and the parking area 20 is arranged on the left side of the distribution area 19.

[0037] An optical cable introduction area 21 is provided at the bottom of the inner box 2, and an optical cable stripping and fixing plate is provided in the optical cable introduction area 21. After the trunk optical cable is fixed on the optical cable stripping and fixing plate, a part of the core optical fibers are welded with the direct melting area 17 of the trunk area 18 as needed, and the other part can be directly welded with the distribution optical cable 28 in the direct melting area 17 as needed.

[0038] The trunk area 18 is composed of a 12-core jumper-free pigtail lead-out tray, which specifically includes a pigtail 23 and a splice tray 24. The splice tray 24 is used to splice the trunk optical cable 22 and the pigtail 23, and to lead the spliced ​​pigtail 23 out at a fixed length.

[0039] After the distribution cable 28 is fixed on the cable stripping and fixing plate, a portion of the optical fibers can enter the distribution area 19 to be fused with the 12-core integrated tray, and the other portion can enter the direct fusion area 17 to be directly fused with the trunk optical cable.

[0040] The distribution area 19 includes an adapter 25, a second pigtail 26, and a fusion protection sheet 27, which are used for fusion and termination of the external optical cable optical fiber and the second pigtail. It is suitable for bundled optical cables and ribbon optical cables. The adapter direction of the 12-core integrated tray is toward the middle fiber optic channel, which facilitates the management of the pigtails in the trunk area 18.

[0041] The pigtails 23 led out from the fiber splicing tray 24 in the trunk area 18 are jumpered with the 12-core integrated tray in the distribution area 19 as needed. The unused pigtails 23 can be fixed in the parking area 20 for easy use next time.

[0042] like Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 As shown, the 12-core integrated tray 29 includes a tray body 30 and a cover plate 36. The tray body 30 includes a fusion protection sheet 27 and a winding unit 32. The winding unit 32 includes a plurality of staggered clamping posts 34 arranged on the tray body 30. The second pigtail 26 and the distribution optical cable are wound in the 12-core integrated tray 29 and are wound and fixed by the clamping posts 34.

[0043] Twelve adapters 25 for plugging in pigtails are fixedly connected to the tray body 30. One end of the adapter 25 is used to fix the movable connector, and the other end (front panel) is used to plug in the pigtails led out of the fiber splicing tray in the trunk area. This design facilitates the subsequent fiber optic connection work. The movable connector is equipped with a second pigtail 26, and a plurality of optical fiber hot-melt tube protection slots 33 are provided on the fusion protection sheet 27. The second pigtail 26 is fused with the distribution cable and fixed on the optical fiber hot-melt tube protection slots 33, and the remaining part is wound on the winding unit 32. For ease of use, a wire sleeve 38 is also provided at the end of the 12-core integrated tray 29. The optical fibers connected to the 12 adapters 25 can be uniformly closed and collected through the wire sleeve 38 to prevent line confusion.

[0044] After the optical fibers are installed in the tray body 30 , the tray body 30 is covered by a cover plate 36 . The cover plate 36 is also provided with a marking plate 37 for marking the fusion route marking information.

[0045] like Figure 14 As shown, in actual applications, the winding unit 32 can also be configured as a cable wheel 35, and the cable wheel 35 can be rotated to reel in / release the optical fiber.

[0046] The utility model is a fiber jumper-free underground optical cable junction box, the main structure of which is as follows:

[0047] The outer box 1 is placed in the foundation pit 4. The outer box 1 and the inner box 2 are movably connected by a support frame 3. When not in operation, the inner box 2 is placed in the outer box 1 and maintained in a horizontal position. When in operation, the inner box 2 can be lifted from the outer box 1 and tilted outward 0-90 degrees by the support frame 3. The support frame 3 not only serves to connect and fix, but also has the function of setting angles and positioning.

[0048] The support frame 3 includes two sets of air springs 5 ​​and positioning brackets 6, one set of air springs 5 ​​and positioning brackets 6 is provided on the left and right sides of the outer box 1 and inner box 2. That is, one set of air springs 5 ​​and positioning brackets 6 is provided at the corresponding positions on the left side of the outer box 1 and inner box 2; at the same time, another set of air springs 5 ​​and positioning brackets 6 is provided at the corresponding positions on the right side of the outer box 1 and inner box 2.

[0049] When the inner box 2 is lifted from the horizontal state, it is assisted by the air spring 5. At the same time, the inner box 2 is fixed at the set working angle by the fixed angle positioning unit provided on the positioning bracket 6, forming multiple working postures between 0-90°. When the inner box 2 is at 0°, it is in the horizontal placement state of the inner box 2 inside the outer box 1; when the inner box 2 is at 90°, it is in the vertical opening state of the inner box 2 outside the outer box 1. The working angles include 10°, 20°, 30°, 40°, 50°, 60°, 70°, and 80°. That is, within a controllable range, the inner box 2 can be flipped to multiple set working angles and positioned and fixed at the working angle to complete related operations applicable to the working angle, such as optical cable laying, optical cable wiring, optical cable bridging, optical cable maintenance, cleaning of dead corners inside the equipment, and other related work.

[0050] In order to achieve the multi-angle positioning function of the present invention, a support seat 7 is provided on the connecting side wall of the inner box body 2, and the support seat 7 is movably connected to the fixed side wall of the outer box body 1. The fixed side wall of the outer box body 1 is provided with a vertical reinforcement column 8, the upper end of the vertical reinforcement column 8 is hinged to the end of the support seat 7, and the inner box body 2 flips around the hinge portion 16 as the center point. The hinge portion 16 is the center point of the overall movement of the inner box body 2. At the same time, the air spring 5 is provided between the middle portion of the vertical reinforcement column 8 and the lower portion of the support seat 7, and the fixed angle positioning unit is also provided between the middle portion of the vertical reinforcement column 8 and the lower portion of the support seat 7.

[0051] The fixed angle positioning unit includes a support rod 9 connected to the support base 7 and a support sleeve 10 connected to the vertical reinforcement column 8. The support rod 9 and the support sleeve 10 cooperate with each other. The lower portion of the support rod 9 is inserted into the support sleeve 10. The support sleeve 10 is provided with a plurality of support holes 11. At the corresponding positions, the support rod 9 is provided with a support block 12. When the support rod 9 moves in the support sleeve 10, the support block 12 can be clamped and supported in one of the support holes 11, forming a positioning support structure, thereby lifting the inner box 2 and fixing it at a set angle. Each pairing fixed position of the support hole 11 and the support block 12 corresponds to a working angle, and the setting of this angle can be obtained by geometric calculation. In the present utility model, 8 support holes 11 are provided on the support sleeve 10, which correspond to 8 set angles: 10°, 20°, 30°, 40°, 50°, 60°, 70°, and 80°. That is, when the inner box body 2 is lifted, from bottom to top, when the first supporting hole 11 is positioned and fixed, the inner box body 2 is lifted 10°; when the second supporting hole 11 is positioned and fixed, the inner box body 2 is lifted 20°; when the third supporting hole 11 is positioned and fixed, the inner box body 2 is lifted 30°; when the fourth supporting hole 11 is positioned and fixed, the inner box body 2 is lifted 40°; when the fifth supporting hole 11 is positioned and fixed, the inner box body 2 is lifted 50°; when the sixth supporting hole 11 is positioned and fixed, the inner box body 2 is lifted 60°; when the seventh supporting hole 11 is positioned and fixed, the inner box body 2 is lifted 70°; when the eighth supporting hole 11 is positioned and fixed, the inner box body 2 is lifted 80°.

[0052] The supporting surface of the support block 12 and the support hole 11 is a plane, or the supporting surface of the support block 12 and the support hole 11 is an upward concave surface, and the concave surface of the lower part of the support block 12 can be clamped on the side wall of the support hole 11 to form a relatively stable support structure. The upper part of the support block 12 is set as an inclined surface. When the support block 12 moves from one support hole 11 to the previous support hole 11, the inclined surface of the upper part of the support block 12 can play a certain guiding role, facilitating the lifting action of the inner box 2. When the support block 12 needs to move from one support hole 11 to the next support hole 11, that is, when the inner box 2 needs to make a closing action, the support rod 9 and the support sleeve 10 can be manually maintained in a parallel state after the support hole 11 is separated from the support hole 11, so that the support rod 9 is inserted downward into the support sleeve 10. In actual application, a return spring can be set on the support rod 9 and the support sleeve 10 to provide work convenience.

[0053] In another embodiment of the present invention, in order to further improve the safety of the present invention, two support blocks 12 are provided on the support rod 9. The two support blocks 12 are spaced apart, and the distance between the two support holes 11 is the same. Generally, two support blocks 12 and two support holes 11 are spaced apart from each other. When the support rod 9 is positioned and supported in the support sleeve 10, the two support blocks 12 are respectively engaged and supported in the two support holes 11, forming a double positioning support structure.

[0054] In another embodiment of the present invention, in order to further improve the safety of the use of the present invention, a through hole 13 and a positioning pin 14 are provided at corresponding positions of the support rod 9 and the support sleeve 10. After the support rod 9 is positioned and supported in the support sleeve 10, the positioning pin 14 is inserted into the through hole 13 to further fix the support rod 9 and the support sleeve 10 to prevent the dangerous situation of tipping over during operation.

[0055] A horizontal seat 15 is provided on the other side wall of the outer box body 1 , and when the inner box body 2 is in a horizontal state, the bottom of the inner box body 2 will be placed on the horizontal seat 15 .

[0056] The fiber-free fiber optic cable junction box is suitable for PON technology FTTX fiber optic access network and is one of the ideal equipment in FTTX construction. It can realize the functions of optical fiber fusion, storage, termination, placement of splitters and laying of home optical cables. It is an interface device for trunk optical cables and distribution optical cables.

[0057] The utility model of underground fiber optic cable junction box without fiber jumper is installed as follows:

[0058] 1. For installation below ground level, such as on a sidewalk, a pit must be dug before installation. The recommended pit dimensions are 1460mm (length) × 970mm (width) × 1160mm (height) to ensure the height between the bottom of the box and the ground surface. A certain slope must be maintained during the construction of the grille pipe or galvanized steel pipe. The highest point of the pipe opening on the well chamber side must be lower than the lowest point of the underground light cross-connection box side opening to prevent accumulated water from flowing from the well chamber into the underground box. The opening size of the grille pipe connecting the underground box is 120*120mm, and there are two openings. The reserved space is on the left side of the outer box. The opening is 310mm wide and 120mm high. The opening is 690mm from the ground and 270mm from the bottom of the pit.

[0059] 2. Tamp the bottom of the pit to ensure that the underground light box is installed firmly. Fill the bottom of the pit with about 50mm of sand and gravel, tamp it firmly, put the base into the bottom of the pit to level it, and then put the underground light box into the base steadily without tilting it.

[0060] 3. Place the crossbeam supporting the manhole cover in the slot in the middle of the outer box. Place the crossbeam-shaped bracket on the upper side of the outer box and place it steadily. Then place the two manhole covers into the slots one by one.

[0061] 4. Cover the manhole cover, fill the soil around the underground light distribution box until it is compacted, and pour cement around the manhole cover groove to ensure the overall safety of the road surface and equipment.

[0062] 5. Installation completed.

[0063] The utility model of underground optical cable junction box without fiber jumper, the optical fiber access and fusion process is as follows:

[0064] 1. Before laying the optical cable through the grille tube, the construction workers should pry open the holes of the grille tube that need to be used with a screwdriver. After laying the optical cable, use Kraft K-704 sealant to seal the gap between the optical cable and the grille tube hole. Leave an extra 2.2m of optical cable outside the optical cross-connection box.

[0065] 2. When installing the optical cable in the optical cross-connect box, the construction personnel need to select the appropriate hole diameter in the stainless steel lock nut of the optical cross-connect box according to the outer diameter of the optical cable for threading. After the optical cable is threaded and fixed, tighten the lock nut so that the lock nut can completely lock the cable to prevent moisture from entering the optical cross-connect box through the cable entrance and exit. To prevent the lock nut from being unable to tighten due to uneven thickness of the optical cable, apply Kraft K-704 sealant on the interface between the optical cable and the lock nut to strengthen the seal of the cable and waterproof joint.

[0066] 3. The path diagram of the optical cable after entering the optical cross-connect box is as follows Figure 1 As shown;

[0067] 4. Internal splicing and wiring method of the optical cross-connect box: After the trunk optical cable is fixed on the cable stripping and fixing plate, a portion of the core number of optical fibers can be spliced ​​with the trunk tray as needed, and the other portion can be directly fused with the distribution optical cable in the direct fusion zone as needed. After the distribution optical cable is fixed on the cable stripping and fixing plate, a portion of the core number of optical fibers can enter the wiring zone and be spliced ​​with the 12-core integrated tray, and the other portion can enter the direct fusion zone unit and be directly fused with the trunk optical cable;

[0068] 5. The optical fiber of the backbone tray can be jumpered with the 12-core integrated tray in the distribution area as needed. The unused optical fiber can be fixed in the parking area for easy use next time.

[0069] The utility model has the following advantages by adopting a fiber jumper-free structure provided in the inner box body:

[0070] 1. The underground optical cable junction box is a nested box consisting of an inner box (optical junction box) and an outer box. The inner box is used to house the optical cable junction equipment, while the outer box protects and supports the junction box. The inner box is normally folded inside the outer box and features a flip-open design for easy operation. The outer box is constructed of carbon steel for structural strength, while the inner box is constructed of 304 stainless steel for corrosion resistance and sealing that meets IP67 dust and water resistance standards.

[0071] 2. Based on the specific operating environments of underground optical cable junction boxes, this innovative design combines a jumper-free panel design with underground installation. The inner cabinet panels utilize a jumper-free layout, divided into a trunk area, a distribution area, a direct-splice area, and a parking area. The trunk area utilizes a splice tray with pigtails, switching from a cross-connection to a direct connection, eliminating one jumper point. This jumper-free design significantly reduces link loss and lowers the likelihood of failure. A single-sided junction box eliminates 144 flexible connectors, while a double-sided junction box eliminates 288 flexible connectors, reducing splice loss by 0.5dB per link.

[0072] 3. Compared with traditional optical cable junction boxes of the same specification, the jumper-free optical cross-connection box has higher density and larger capacity. The jumper-free layout design concentrates the fiber routing, aligns the fiber routing, and makes the fiber routing more standardized and reasonable.

[0073] 4. Engineering personnel do not need to carry optical jumpers when opening services. Compared with the traditional optical cable junction box method, it is easier to access optical fibers and open services, and construction and maintenance are more convenient.

[0074] The utility model of the underground optical cable junction box without fiber jumper also has the following main features:

[0075] 1. Installation and maintenance are all done on the ground to avoid the danger and difficulty of high-altitude operations;

[0076] 2. The whole structure does not need to occupy the ground or three-dimensional space. After installation, it is flat and consistent with the ground, and is easy to coordinate with existing traffic facilities without affecting traffic safety and urban appearance;

[0077] 3. The optical cross-connection box can be stopped at multiple angles within 90°, which is convenient for on-site installation and later maintenance. It adopts a combination of air spring auxiliary support and 304 stainless steel bracket. The box is driven to rise and fall by the lifting seat, which is convenient for the maintenance and maintenance of the equipment in the optical cross-connection box. This connection method is beneficial to saving time, labor, safety and efficiency in the subsequent use process;

[0078] 4. The optical cross-connect box has functions such as optical fiber splicing, terminal storage and scheduling. It adopts a modular design and each module can be taken out separately, which is convenient for construction and maintenance.

[0079] The utility model of the underground optical cable junction box without fiber jumper has the following main features:

[0080] Protection function: The optical cable junction box is made of high-strength materials and has good weather resistance, waterproof and dustproof capabilities, which can effectively protect the optical cable from interference and damage from the external environment.

[0081] Connection function: The optical fiber junction box provides a connection interface for optical fiber cables, making it easy to connect and distribute optical cables. The design and layout of the connectors can meet the needs of different types and specifications of optical cables.

[0082] Safety performance: The optical cable junction box is usually equipped with a reliable switch lock mechanism on the protective shell, and has fire prevention and anti-theft safety measures to ensure the safe operation of the optical cable system and the integrity of the data.

[0083] Multi-angle stable opening function: The inner box can be opened at multiple angles, providing excellent working convenience.

[0084] Easy to install and maintain: Due to the multi-angle stable opening function, it is easy for installers and maintenance personnel to operate and convenient for inspection and replacement of optical cables.

Claims

1. A fiber jumper-free underground optical cable junction box, characterized in that: It includes an outer box, an inner box and a support frame, wherein the inner box is provided with a direct melting area, a trunk area, a distribution area and a parking area. The trunk area is composed of a 12-core jumper-free pigtail lead-out tray, including pigtails and splice trays. The splice tray is used for splicing the trunk optical cable and the pigtail, and leading out the fixed-length pigtail after splicing. The pigtail led out by the splice tray is jumpered with the 12-core integrated tray in the distribution area as needed, and the unused pigtail is fixed in the parking area.

2. The underground optical cable junction box without fiber jumper according to claim 1, characterized in that: The bottom of the inner box is provided with an optical cable introduction area, and an optical cable stripping and fixing plate is provided in the optical cable introduction area. After the trunk optical cable is fixed on the optical cable stripping and fixing plate, a part of the core optical fibers are fused with the trunk area as needed, and the other part is directly fused with the distribution optical cable in the direct fusion area as needed.

3. The underground optical cable junction box without fiber jumper according to claim 2, characterized in that: After the distribution optical cable is fixed on the cable stripping and fixing plate, a portion of the optical fibers can enter the distribution area and be fused with the 12-core integrated tray, and the other portion enters the direct fusion area and is directly fused with the trunk optical cable.

4. The underground optical cable junction box without fiber jumper according to claim 3, characterized in that: The 12-core integrated tray includes a tray body and a cover plate. The tray body includes a fusion protection sheet and a cable winding unit. Twelve adapters are fixedly connected to the tray body. One end of the adapter is used to fix the active connector, and the other end is used to plug in the pigtails led out of the main area fiber splicing tray.

5. The underground optical cable junction box without fiber jumper according to claim 4, characterized in that: The movable connector is equipped with a second pigtail, and a plurality of optical fiber hot-melt tube protection slots are provided on the fusion protection sheet. The second pigtail is fused with the distribution optical cable and fixed on the optical fiber hot-melt tube protection slots; the cable winding unit includes a plurality of staggered card posts provided on the tray body, and the second pigtail and the distribution optical cable are wound in the 12-core integrated tray and are wound and fixed by the card posts.

6. The underground optical cable junction box without fiber jumper according to claim 1, characterized in that: The outer box is placed in the foundation pit, and the outer box and the inner box are movably connected by a support frame. The support frame includes two groups of air springs and positioning brackets. A group of air springs and positioning brackets are provided on the left and right sides of the outer box and the inner box. When the inner box is lifted from a horizontal state, it is assisted by the air springs. At the same time, the inner box is fixed at a set working angle by a fixed angle positioning unit provided on the positioning bracket, forming multiple working postures between 0-90°.

7. The underground optical cable junction box without fiber jumper according to claim 6, characterized in that: A support base is provided on the connecting side wall of the inner box body, and the support base is movably connected to the fixed side wall of the outer box body.

8. The underground optical cable junction box without fiber jumper according to claim 7, characterized in that: The fixed side wall of the outer box body is provided with a vertical reinforcement column, the upper end of the vertical reinforcement column is hinged to the end of the support seat, and the inner box body performs a flipping movement with the hinged portion as the center point.

9. The underground optical cable junction box without fiber jumper according to claim 8, characterized in that: The air spring is arranged between the middle portion of the vertical reinforcement column and the lower portion of the support seat.

10. The underground optical cable junction box without fiber jumper according to claim 9, characterized in that: The fixed angle positioning unit is further provided between the middle portion of the vertical reinforcement column and the lower portion of the support seat.

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