Sealing structure of buried cable branch box

Abstract

The invention discloses a sealing structure of a buried cable branch box, and particularly relates to the technical field of cable branch boxes, the sealing structure comprises a branch box body, two side walls of an inner cavity of the branch box body are each fixedly provided with a plurality of sealing parts, each sealing part comprises a U-shaped frame, two vertical parts of each U-shaped frame are each fixedly provided with a fixing pipe in a penetrating mode, and the fixing pipes are fixed to the two vertical parts of each U-shaped frame in a penetrating mode. Movable parts are fixed to the outer surfaces of the two fixing pipes, the outer surfaces of the two fixing pipes are jointly and fixedly connected with a clamping part, and a positioning part is fixed to the outer surface of the side, away from the connecting assembly, of the fixing pipe. According to the sealing structure of the buried cable branch box, through mutual cooperation of the positioning part, the movable parts and the clamping part, double-layer sealing can be formed at the joint, the problem that the sealing structure is single is avoided, meanwhile, due to mutual cooperation of the two movable parts and the clamping part, the sealing structure is simple in structure, and the sealing effect is good. And cables with different diameters can be compatible, extra plugging is not needed, and the adaptability of the interface is improved.

Description

Technical Field

[0001] This invention relates to the field of cable branch box technology, and more particularly to a sealing structure for an underground cable branch box. Background Technology

[0002] With the rapid development of the modernization of the power industry, power grid transformation has been launched in all aspects. When underground main cables need to be distributed to multiple circuits over a certain distance, using cable branch boxes as an important supporting equipment for power distribution is an economical, convenient and safe method. Underground cable branch boxes can realize the interconnection and connection of power cables in a flexible, economical and reliable way. Their simple and convenient connection combination form makes them replace cable intermediate joints in more and more situations.

[0003] During the use of underground cable distribution boxes, single-layer sealing structures (such as those relying solely on flange bolts or sealing rings) have low reliability. Minor deformations or uneven stress can easily lead to water leakage. Fixed interface sizes make it difficult to accommodate cables of different diameters, requiring additional sealing, resulting in poor interface compatibility. Furthermore, the rigid connection between the cable and the interface causes stress concentration at the interface during underground settlement or external pulling, leading to deformation of the sealing structure. In addition, due to the weight of the cable itself, the cable may sag, causing the connection to age and crack easily, posing certain safety risks. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of water leakage due to the simple sealing structure, poor interface compatibility requiring additional sealing, stress concentration at the interface leading to deformation of the sealing structure, and easy aging and cracking of the connection due to the weight of the cable itself during the use of underground cable branch boxes. Therefore, this invention proposes a sealing structure for underground cable branch boxes.

[0005] To achieve the above objectives, the present invention employs the following technology: a sealing structure for an underground cable branch box.

[0006] The device includes a branch box, on which multiple sealing components are fixedly installed on both sides of the inner cavity of the branch box, and on the bottom wall of the inner cavity of the branch box, a connecting component adapted to the sealing components is fixedly installed.

[0007] The sealing component includes a U-shaped frame, with a fixed tube fixedly inserted through each of the two vertical parts of the U-shaped frame. Movable parts are fixedly attached to the outer surfaces of the two fixed tubes. A push rod is fixed between the two movable parts. A clamping component is fixedly connected to the outer surfaces of the two fixed tubes. A positioning component is fixedly attached to the outer surface of the fixed tube on the side away from the connecting component.

[0008] The clamping component includes annular blocks, each of the two annular blocks having a plurality of annular array sliding grooves, and a set of annular array sliding blocks being slidably installed on the side of the two annular blocks that are close to each other, and a connecting rod adapted to the sliding grooves on both sides being fixed through the plurality of sliding blocks in the same set.

[0009] The rotation of the two moving parts causes the two sets of sliding blocks to move along the sliding groove under the action of the connecting rod. The two sets of sliding blocks adopt a split design to flexibly clamp the cable and seal the connection between the two annular blocks.

[0010] A further description of the sealing structure of an underground cable branch box as described above:

[0011] Both sides of the inner cavity of the branch box are fixed with straight plates. Two symmetrical Z-shaped blocks are rotatably connected between the two sides of the inner cavity of the branch box. One side of the Z-shaped block is fixed with a sealing plate one, and the lower side of the horizontal part of the other Z-shaped block is fixed with a sealing plate two that matches the sealing plate one. The horizontal part of the Z-shaped block is inlaid with a silicone sheet that matches the straight plate, and the side of the sealing plate two is inlaid with a silicone sheet that matches the sealing plate one.

[0012] A further description of the sealing structure of an underground cable branch box as described above:

[0013] The positioning component includes an installation tube fixed to the outer surface of the fixing tube, an annular gasket fixed in the inner cavity of the installation tube, a plurality of positioning rods in an annular array rotatably mounted in the inner cavity of the installation tube via a torsion spring connector, a plurality of arc-shaped pieces in an annular array rotatably mounted in the inner cavity of the installation tube via a torsion spring connector, and an elastic sealing ring adapted to the inner surface of the plurality of arc-shaped pieces being fixed together on the outer surface of the plurality of arc-shaped pieces.

[0014] A further description of the sealing structure of an underground cable branch box as described above:

[0015] One end of the mounting tube is fixed with a connecting ring, the outer surface of the connecting ring is threaded with a sealing cap, the inner surface of the connecting ring is provided with a waterproof groove, and a flat-topped conical tube is fixed to the inner surface of the connecting ring.

[0016] A further description of the sealing structure of an underground cable branch box as described above:

[0017] The movable component includes a fixing ring fixed to a fixing tube. The outer surface of the fixing ring has multiple annular array grooves. Each of the multiple grooves has a compression spring fixed inside. One side of the fixing ring is rotatably connected to an annular plate. One side of the annular plate has multiple annular array arc-shaped grooves.

[0018] A further description of the sealing structure of an underground cable branch box as described above:

[0019] The outer surface of the fixed ring is rotatably connected to a rotating ring that is fixedly connected to the annular plate. The inner surface of the rotating ring is fixed with a plurality of push blocks adapted to the compression spring. The outer surface of the rotating ring is fixed with a straight block, and the straight block is fixedly connected to the push rod.

[0020] A further description of the sealing structure of an underground cable branch box as described above:

[0021] The annular block and the annular plate are rotatably connected, and an annular sealing plate is fixed between the two annular blocks. Multiple connecting rods on the same side are adapted to the arc groove on the annular plate, and multiple sliding blocks on the same side are fixed with elastic blocks on the side near the center of the sliding groove.

[0022] A further description of the sealing structure of an underground cable branch box as described above:

[0023] A support component is fixed to the outer surface of the fixed tube near the connecting component. The support component includes a ring block fixed to the fixed tube. An annular plate is rotatably connected to one side of the ring block. A plurality of annular array connecting springs are fixed to one side of the annular plate. A movable tube is fixed to one side of the plurality of connecting springs. A plurality of annular array guide rods are fixed to one side of the annular plate. The plurality of guide rods are slidably connected to the movable tube. Two annular array locking blocks are fixed to the outer surface of the movable tube. A limiting component for limiting the movement trajectory of the locking blocks is fixed to one side of the ring block.

[0024] A further description of the sealing structure of an underground cable branch box as described above:

[0025] The limiting component includes a limiting ring plate fixedly connected to the ring block. The inner surface of the limiting ring plate has two slots that are adapted to the locking block. The outer surface of the limiting ring plate is fixed with a limiting tube, and the inner surface of the limiting tube is fixed with an annular stop bar.

[0026] A further description of the sealing structure of an underground cable branch box as described above:

[0027] A rotating block is fixed on the outer surface of the movable tube. Both sides of the rotating block are rotatably connected to L-shaped brackets via torsion springs. The ends of the two L-shaped brackets away from the rotating block are jointly mounted with guide wheels.

[0028] In summary, due to the adoption of the above-mentioned sealing structure of the underground cable branch box, the beneficial effects of this invention are:

[0029] 1. This device, through the cooperation of the positioning component, the moving component and the clamping component, can form a double seal at the interface, avoiding the problem of a single sealing structure. At the same time, due to the cooperation between the two moving components and the clamping component, it can also be compatible with cables of different diameters without the need for additional sealing, thus improving the adaptability of the interface.

[0030] 2. This device, through its positioning components, not only forms a preliminary seal but also flexibly clamps the cable, preventing stress concentration caused by rigid cable fixing and thus avoiding deformation of the sealing structure. In use, open the sealing cover, pass the cable through the flat-top conical tube, and through four positioning rods. The end of the positioning rod closest to the cable is a ball, which facilitates the cable's passage and provides flexible support for the cable under the action of elasticity. Then, the cable passes through multiple arc-shaped plates and contacts the inner surface of the arc-shaped plates, squeezing the elastic sealing ring. As the cable passes through the elastic sealing ring, the elastic sealing ring can fit tightly against the cable surface, forming a preliminary seal.

[0031] 3. This device, through the expansion and contraction of two sets of sliding blocks, allows the sliding blocks and connected elastic blocks to adapt to cables of different diameters and form a seal for cables of different diameters, thereby improving the applicability of the device. The connecting rods on the two sets of sliding blocks move simultaneously under the action of the arc grooves on both sides, causing the two sets of sliding blocks to expand. The cable can pass through the elastic blocks connected to the two sets of sliding blocks. When the push rod is released, under the contraction action of the push block connected to the rotating ring and the compression spring, the rotating ring begins to rotate back to its original position. At the same time, the arc groove on the ring plate moves with the adapted connecting rod, causing the two sets of sliding blocks to begin to contract. Simultaneously, the elastic blocks on the sliding blocks flexibly clamp the cable, sealing the cable between the two sliding grooves, thereby forming a secondary seal.

[0032] 4. This device, through its designed support components, can support cables, preventing them from sagging and avoiding aging and cracking caused by bending at cable joints. It can also provide support in different directions, adjusting the direction of support according to the cable's direction, thus improving the device's applicability. When the cable is moving upwards, the two L-shaped supports are located on the upper side, and the guide wheel is located on the upper side of the cable, providing downward force to increase the angle of the cable's bend, making the bend smoother and preventing cracking. When the cable is moving downwards, the two L-shaped supports are located on the lower side, and the guide wheel is located on the lower side of the cable, providing support to prevent sagging and aging at bends. Attached Figure Description

[0033] Figure 1 A schematic diagram of the overall structure provided according to an embodiment of the present invention is shown;

[0034] Figure 2 An overall structural cross-sectional view provided according to an embodiment of the present invention is shown;

[0035] Figure 3 A schematic diagram of a sealing component structure provided according to an embodiment of the present invention is shown;

[0036] Figure 4 An exploded view of a sealing component structure provided according to an embodiment of the present invention is shown;

[0037] Figure 5 A cross-sectional view of a positioning component structure provided according to an embodiment of the present invention is shown;

[0038] Figure 6 An exploded view of the positioning component structure provided according to an embodiment of the present invention is shown;

[0039] Figure 7 A cross-sectional view of an active component structure provided according to an embodiment of the present invention is shown;

[0040] Figure 8 An exploded view of the structure of an active component according to an embodiment of the present invention is shown;

[0041] Figure 9 A schematic diagram of the clamping component structure provided according to an embodiment of the present invention is shown;

[0042] Figure 10 A cross-sectional view of a clamping component structure provided according to an embodiment of the present invention is shown;

[0043] Figure 11 An explosion of the clamping component structure provided according to an embodiment of the present invention is shown. Figure 1 ;

[0044] Figure 12 An explosion of the clamping component structure provided according to an embodiment of the present invention is shown. Figure 2 ;

[0045] Figure 13 A schematic diagram of the clamping component mounting cable provided according to an embodiment of the present invention is shown;

[0046] Figure 14 A cross-sectional view of a support component structure provided according to an embodiment of the present invention is shown. Figure 1 ;

[0047] Figure 15 A cross-sectional view of a support component structure provided according to an embodiment of the present invention is shown. Figure 2 ;

[0048] Figure 16 An explosion of a support component structure provided according to an embodiment of the present invention is shown. Figure 1 ;

[0049] Figure 17 An explosion of a support component structure provided according to an embodiment of the present invention is shown. Figure 2;

[0050] Figure 18 A cross-sectional view of the limiting component structure provided according to an embodiment of the present invention is shown;

[0051] Figure 19 A schematic diagram of cable installation with upward routing provided according to an embodiment of the present invention is shown;

[0052] Figure 20 A schematic diagram of a cable installation with its downward orientation provided according to an embodiment of the present invention is shown.

[0053] Legend:

[0054] 10. Branch box; 11. Straight plate; 12. Z-shaped block; 13. Sealing plate one; 14. Sealing plate two; 15. Connecting assembly;

[0055] 20. Sealing components; 21. U-shaped bracket; 22. Fixing tube;

[0056] 23. Positioning component; 231. Mounting tube; 232. Annular gasket; 233. Elastic sealing ring; 234. Arc-shaped piece; 235. Positioning rod; 236. Connecting ring; 237. Sealing cap; 238. Waterproof groove; 239. Flat-top conical tube;

[0057] 24. Moving parts; 241. Fixed ring; 242. Compression spring; 243. Slide groove; 244. Annular plate; 245. Arc groove; 246. Push block; 247. Rotating ring; 248. Straight block;

[0058] 25. Clamping component; 251. Annular block; 252. Sliding groove; 253. Annular sealing plate; 254. Sliding block; 255. Connecting rod; 256. Elastic block;

[0059] 26. Push rod;

[0060] 27. Support component; 271. Ring block; 272. Annular piece; 273. Connecting spring; 274. Guide rod; 275. Moving tube; 276. Locking block; 277. Limiting assembly; 2771. Limiting ring plate; 2772. Slot; 2773. Limiting tube; 2774. Annular stop bar; 278. Rotating block; 279. L-shaped bracket; 280. Guide wheel. Detailed Implementation

[0061] The sealing structure of a buried cable branch box according to an embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] Example 1

[0063] like Figure 1 and Figure 2 As shown, a sealing structure for an underground cable branch box includes a branch box body 10, which is a box for cable branching. Multiple sealing components 20 are fixedly installed on both sides of the inner cavity of the branch box body 10. The sealing components 20 are used to install cables and seal the branch box body 10. The multiple sealing components 20 can branch the cables. A connection component 15 adapted to the sealing components 20 is fixed on the bottom wall of the inner cavity of the branch box body 10. The connection component 15 includes a grounding bar, a busbar, and a cable plug, etc., and the plug is adapted to the plug on the cable.

[0064] Conventional cable distribution boxes typically use hinges to connect the sealing cover to the box body, which creates gaps between the box body and the sealing cover, allowing water or dirt to seep into the distribution box. Also, it is inconvenient to open and difficult to maintain.

[0065] Next, as Figure 2 As shown, in order to seal the branch box 10, straight plates 11 are fixed on both sides of the inner cavity of the branch box 10. Two symmetrical Z-shaped blocks 12 are rotatably connected between the two sides of the inner cavity of the branch box 10. The horizontal part of one side of the Z-shaped block 12 cooperates with the straight plate 11 and can be in close contact with the lower side of the straight plate 11. One side of one Z-shaped block 12 is fixed with a sealing plate 13. One side of the horizontal part of the Z-shaped block 12 is fixedly connected with the sealing plate 13. The lower side of the horizontal part of the other Z-shaped block 12 is fixed with a sealing plate 14 that cooperates with the sealing plate 13. The sealing plate 14 is located below the sealing plate 13.

[0066] When opened, the Z-shaped block 12 connected to the sealing plate 13 rotates first, and then the Z-shaped block 12 connected to the sealing plate 14 rotates, so that both the sealing plate 13 and the sealing plate 14 can be in a vertical state, which facilitates the maintenance of the internal components of the branch box 10.

[0067] Among them, the horizontal part of the Z-shaped block 12 is inlaid with a silicone sheet that is compatible with the straight plate 11, and one side of the sealing plate 14 is inlaid with a silicone sheet that is compatible with the sealing plate 13.

[0068] During sealing, first rotate sealing plate 14 to a horizontal position, then rotate sealing plate 13 to a horizontal position. Sealing plate 13 presses onto the silicone sheet of sealing plate 14, thus blocking the gap between sealing plate 13 and sealing plate 14. The silicone sheet of the horizontal part of Z-shaped block 12 and the straight plate 11 on the same side squeeze each other to block the gap and improve the sealing effect of the device.

[0069] Next, as Figure 3 and Figure 4 As shown, the sealing component 20 includes a U-shaped frame 21, which is fixed to the side wall of the inner cavity of the branch box 10. The two vertical parts of the U-shaped frame 21 are each fixed with a fixed tube 22. The outer surfaces of the two fixed tubes 22 are each fixed with a movable component 24. The movable component 24 is located on the side of the outer surfaces of the two fixed tubes 22 that are close to each other. A push rod 26 is fixed between the two movable components 24. The push rod 26 is used to control the two movable components 24 at the same time. The outer surfaces of the two fixed tubes 22 are jointly fixedly connected with a clamping component 25, which is located between the two movable components 24.

[0070] Among them, a positioning component 23 is fixed on the outer surface of the fixing tube 22 on the side away from the connecting component 15. The positioning component 23 is used to position the cable and form a preliminary seal. A support component 27 is fixed on the outer surface of the fixing tube 22 on the side close to the connecting component 15. The support component 27 is used to support the cable and prevent the cable from cracking or breaking due to gravity or bending force.

[0071] Next, as Figure 5 and Figure 6 As shown, the positioning component 23 includes an installation tube 231 fixed to the outer surface of the fixing tube 22. An annular gasket 232 is fixed inside the installation tube 231. Multiple positioning rods 235 in annular array are rotatably mounted inside the installation tube 231 through a torsion spring connector. Multiple arc-shaped pieces 234 in annular array are rotatably mounted inside the installation tube 231 through a torsion spring connector. The torsion spring connector includes a U-shaped plate fixedly connected to the inner cavity of the installation tube 231. A rotating shaft is rotatably mounted between the two vertical parts of the U-shaped plate. A connecting plate connected to the U-shaped plate through a torsion spring is fixed on the rotating shaft. The connecting plate on the torsion spring connector to which the arc-shaped piece 234 is connected is fixedly connected to the outer surface of the arc-shaped piece 234. The connecting plate on the torsion spring connector to which the positioning rod 235 is connected is fixedly connected to one end of the positioning rod 235, so that the arc-shaped piece 234 and the positioning rod 235 can retract under the action of the torsion spring.

[0072] Multiple positioning rods 235 can support the cable passing through the mounting tube 231, avoiding rigid fixing of the cable, reducing stress concentration at the interface, and preventing deformation of the sealing structure;

[0073] In addition, multiple arc-shaped pieces 234 are fixed together with an elastic sealing ring 233 that matches the inner surface of the annular gasket 232. The inner surface of the elastic sealing ring 233 is flush with the inner surface of the arc-shaped pieces 234. The inner surface of the elastic sealing ring 233 is flat-topped and conical, which facilitates the cable to pass through. At the same time, due to the elasticity of the elastic sealing ring 233, the elastic sealing ring 233 is in close contact with the cable surface, forming a preliminary seal.

[0074] In addition, the length of the annular gasket 232 is greater than that of the elastic sealing ring 233, so that the elastic sealing ring 233 has a certain amount of room to move when compressed.

[0075] Additionally, a connecting ring 236 is fixed to one end of the mounting tube 231. A sealing cap 237 is threaded onto the outer surface of the connecting ring 236. The sealing cap 237 can block the connecting ring 236 to form a seal. When the sealing component 20 is not in use, the sealing cap 237 is installed on the connecting ring 236. When needed, the sealing cap 237 can be removed to install a new cable. This eliminates the need for drilling holes in the sealing component 20 when installing new cables, facilitating quick and easy installation of new cables.

[0076] Next, a waterproof groove 238 is provided on the inner surface of the connecting ring 236. The waterproof groove 238 can store water flowing into the inner cavity of the installation pipe 231. A flat-topped conical tube 239 is fixed on the inner surface of the connecting ring 236. The flat-topped conical tube 239 is conical. The slope of the inner cavity of the flat-topped conical tube 239 can block the seeping water and prevent water from seeping into the inner cavity of the installation pipe 231.

[0077] Next, as Figure 7 and Figure 8 As shown, the movable component 24 includes a fixed ring 241 fixed to the fixed tube 22. The outer surface of the fixed ring 241 is provided with multiple annular array grooves 243. Each groove 243 has a compression spring 242 fixed inside. The compression spring 242 is in a compressed state and will have a certain reverse tension after being stretched. An annular plate 244 is rotatably connected to one side of the fixed ring 241. The inner surface of the annular plate 244 is in close contact with the outer surface of the fixed tube 22, and the annular plate 244 is slidably connected to the fixed tube 22. Multiple annular array arc grooves 245 are provided on one side of the annular plate 244.

[0078] Among them, the outer surface of the fixed ring 241 is rotatably connected to the rotating ring 247 which is fixedly connected to the annular plate 244. The inner surface of the rotating ring 247 is fixed with a number of push blocks 246 adapted to the compression spring 242. The push blocks 246 are located in the inner cavity of the slide groove 243 and are fixedly connected to the compression spring 242. Rotating the rotating ring 247 can cause the push blocks 246 to pull the compression spring 242. The reverse tension on the compression spring 242 will cause the rotating ring 247 to rotate in the opposite direction of the pull, thereby causing the annular plate 244 to rotate as well.

[0079] Next, a straight block 248 is fixed on the outer surface of the rotating ring 247. The straight block 248 is fixedly connected to the push rod 26. The straight blocks 248 on both movable parts 24 are fixedly connected to the push rod 26, so that the push rod 26 can control the rotation of the two rotating rings 247 at the same time.

[0080] Furthermore, such as Figures 9-11 As shown, the clamping component 25 includes two annular blocks 251 fixedly connected to the fixed tube 22. The two annular blocks 251 are respectively fixed on the outer surface of the two fixed tubes 22. The annular blocks 251 are rotatably connected to the annular plate 244. The rotation of the annular plate 244 will not affect the annular blocks 251. Several annular array sliding grooves 252 are provided on each of the two annular blocks 251. The number of sliding grooves 252 is twice the number of arc grooves 245. The arc grooves 245 on the two annular plates 244 correspond one-to-one with the sliding grooves 252 on the annular blocks 251. That is, the angles of the arc grooves 245 on the two annular plates 244 are different, so that the arc grooves 245 on the annular plates 244 correspond to the sliding grooves 252 on the annular blocks 251 at intervals. An annular sealing plate 253 is fixed between the two annular blocks 251.

[0081] Next, a set of annular array sliding blocks 254 are slidably installed on one side of the two annular blocks 251 that are close to each other. The sliding blocks 254 on both sides are slidably connected. Connecting rods 255 that are adapted to the sliding grooves 252 on both sides are fixed through multiple sliding blocks 254 in the same group. Multiple connecting rods 255 on the same side are spaced apart in the inner cavity of the sliding grooves 252 on the two annular blocks 251. Multiple connecting rods 255 on the same side are adapted to the arc grooves 245 on the annular plate 244. Multiple connecting rods 255 on the same side are also adapted to the arc grooves 245 on the annular plate 244. The connecting rod 255 is located in the inner cavity of the arc-shaped groove 245 away from this side. Multiple connecting rods 255 on the side near the support member 27 are located in the inner cavity of the arc-shaped groove 245 on the side near the positioning member 23. Multiple connecting rods 255 on the side near the positioning member 23 are located in the inner cavity of the arc-shaped groove 245 on the side near the support member 27. Multiple sliding blocks 254 on the same side are all fixed with elastic blocks 256 on the side near the center of the sliding groove 252. The elastic blocks 256 are elastic and can be extended in the compressed state.

[0082] like Figure 12 and Figure 13 As shown, the rotation of the two movable parts 24 causes the two sets of sliding blocks 254 to move along the sliding groove 252 under the action of the connecting rod 255. The two sets of sliding blocks 254 adopt a split design to flexibly clamp the cable and seal the connection of the two annular blocks 251.

[0083] Example 2

[0084] This embodiment further defines the support component 27 based on Embodiment 1, in order to support the cable and prevent aging at the cable bend.

[0085] Furthermore, such as Figure 14 — Figure 17 As shown, the support component 27 includes an annular block 271 fixed to the fixed tube 22. An annular plate 272 is rotatably connected to one side of the annular block 271. A plurality of annular array connecting springs 273 are fixed to one side of the annular plate 272. A movable tube 275 is fixed to one side of the plurality of connecting springs 273. A mounting hole for mounting the connecting springs 273 is opened on one side of the movable tube 275. The connecting springs 273 are fixedly connected to the side wall of the mounting hole. Under normal conditions, the connecting springs 273 are in a compressed state, so that the connecting springs 273 and the annular plate 272 are tightly attached under normal conditions. A plurality of annular array guide rods 274 are fixed to one side of the annular plate 272. The plurality of guide rods 274 are slidably connected to the movable tube 275. The movable tube 275 has a circular hole for mounting the guide rods 274, so that the guide rods 274 can guide the movable tube 275 to move. Due to the action of the guide rods 274, the movable tube 275 can rotate with the annular plate 272.

[0086] Next, two ring array of locking blocks 276 are fixed on the outer surface of the moving tube 275, and a limiting component 277 for limiting the movement trajectory of the locking block 276 is fixed on one side of the ring block 271.

[0087] Among them, such as Figure 18 As shown, the limiting component 277 includes a limiting ring plate 2771 fixedly connected to the ring block 271. The inner surface of the limiting ring plate 2771 has two slots 2772 that are adapted to the locking block 276. The locking block 276 can be locked in the inner cavity of the slot 2772, thereby fixing the connecting spring 273. The outer surface of the limiting ring plate 2771 is fixed with a limiting tube 2773. The distance between the limiting tube 2773 and the moving tube 275 is exactly matched with the thickness of the locking block 276. The inner surface of the limiting tube 2773 is fixed with an annular stop strip 2774. The annular stop strip 2774 is in close contact with the surface of the moving tube 275, so that the locking block 276 can only move to the position in close contact with the annular stop strip 2774, thereby limiting the distance the moving tube 275 moves, making it easier to control the rotation of the moving tube 275 and ensuring the stability of the moving tube 275.

[0088] Next, a rotating block 278 is fixed on the outer surface of the moving tube 275. Both sides of the rotating block 278 are rotatably connected to L-shaped brackets 279 through torsion springs. The L-shaped brackets 279 have a certain steering force under the action of the torsion springs. The two L-shaped brackets 279 are rotatably mounted with guide wheels 280 at the ends away from the rotating block 278. The guide wheels 280 are used to guide the cable.

[0089] like Figure 19 and Figure 20As shown, by rotating the moving tube 275, the L-shaped bracket 279 can be in two states. In one state, when the cable is moving upward, the two L-shaped brackets 279 are located on the upper side, and the guide wheel 280 is located on the upper side of the cable, providing downward force to the cable, which increases the angle of the cable bending point, makes the bend smooth, and avoids cable cracking. In the other state, when the cable is moving downward, the two L-shaped brackets 279 are located on the lower side, and the guide wheel 280 is located on the lower side of the cable, providing support for the cable, preventing the cable from sagging, and avoiding aging at the bend.

[0090] It should be noted that the connecting component 15, the elastic sealing ring 233, the sealing cover 237, and the guide wheel 280 in this invention are all existing technologies, and their installation methods and control methods are also conventional designs, which will not be described in detail in this invention.

[0091] Working principle of the invention: This device is a sealing structure for an underground cable branch box. Through the cooperation between the positioning component 23, the movable component 24 and the clamping component 25, the device can form a double-layer seal at the interface, avoiding the problem of a single sealing structure. At the same time, due to the cooperation between the two movable components 24 and the clamping component 25, it can also be compatible with cables of different diameters, thus improving the adaptability of the interface.

[0092] The positioning component 23 not only forms a preliminary seal, but also flexibly clamps the cable, avoiding stress concentration caused by rigid cable fixing, thereby avoiding the problem of deformation of the sealing structure.

[0093] In use, open the sealing cover 237, pass the cable through the flat-top conical tube 239, and pass through four positioning rods 235. The end of the positioning rod 235 near the cable is a ball, which facilitates the cable passing through. Under the action of elasticity, it forms a flexible support for the cable. Then the cable passes through multiple arc-shaped pieces 234 and contacts the inner surface of the arc-shaped pieces 234, which compresses the elastic sealing ring 233. At the same time, the elastic sealing ring 233 can be tightly attached to the surface of the cable, forming a preliminary seal. Then the cable passes through the inner cavity of the fixing tube 22.

[0094] The cable passes through the fixed tube 22 and contacts the elastic block 256. At this time, by pushing the push rod 26, the straight blocks 248 on the two movable parts 24 rotate with the rotating ring 247, thereby causing the annular plate 244 fixedly connected to the rotating ring 247 to rotate. At the same time, the arc groove 245 causes the connecting rod 255 fixed to the sliding block 254 to move in the inner cavity of the sliding groove 252. The connecting rods 255 on the two sets of sliding blocks 254 move simultaneously under the action of the arc grooves 245 on both sides, causing the two sets of sliding blocks 254 to expand, so that the cable can pass through the elastic block 256 connected to the two sets of sliding blocks 254.

[0095] After the cable exits from another fixed conduit 22, the push rod 26 is released. Under the contraction action of the push block 246 connected to the rotating ring 247 and the compression spring 242, the rotating ring 247 begins to rotate back to its original position. At the same time, the arc-shaped groove 245 on the annular plate 244 moves the adapted connecting rod 255, causing the two sets of sliding blocks 254 to begin to contract. Simultaneously, the elastic block 256 on the sliding block 254 flexibly clamps the cable. Figure 12 and Figure 13 As shown, the cable is sealed between two sliding grooves 252, thus forming a secondary seal;

[0096] By expanding and contracting the two sets of sliding blocks 254, the sliding blocks 254 and the connected elastic blocks 256 can be adapted to cables of different diameters and can form a seal for cables of different diameters, thereby improving the applicability of the device.

[0097] The support component 27 can be used to support the cable, prevent the cable from sagging, prevent bending at the cable connection from causing the cable to age and crack, and can also provide "support" for the cable in different directions. The direction of support can be adjusted according to the direction of the cable, which improves the applicability of the device.

[0098] After the cable passes through the fixed tube 22, it passes through the groove on the guide wheel 280, and then connects to the elbow-type cable connector, which is connected to the interface on the clamping component 25.

[0099] By pulling the moving tube 275, the two locking blocks 276 are brought out from the inner cavity of the two locking slots 2772. Then, the moving tube 275 is rotated 180 degrees, so that the two L-shaped brackets 279 are rotated 180 degrees and placed in the symmetrical position of the initial position. Then, under the action of the connecting spring 273, the moving tube 275 is retracted, and the two locking blocks 276 enter the inner cavity of the two locking slots 2772 to prevent the moving tube 275 from rotating.

[0100] like Figure 19 and Figure 20 As shown, by rotating the moving tube 275, the L-shaped bracket 279 can be in two states. In one state, the cable runs upward, with the two L-shaped brackets 279 on the upper side and the guide wheel 280 on the upper side of the cable, providing downward force to the cable, which increases the angle of the cable bend and makes the bend smooth, thus preventing the cable from cracking. In the other state, the cable runs downward, with the two L-shaped brackets 279 on the lower side and the guide wheel 280 on the lower side of the cable, providing support for the cable, preventing the cable from sagging, and preventing aging at the bend.

[0101] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the sealing structure of the underground cable branch box and its inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. A sealing structure for an underground cable branch box, comprising a branch box body (10), characterized in that: Multiple sealing components (20) are fixedly installed on both sides of the inner cavity of the branch box (10), and a connecting component (15) adapted to the sealing component (20) is fixed on the bottom wall of the inner cavity of the branch box (10). The sealing component (20) includes a U-shaped frame (21), with a fixed tube (22) fixedly inserted through each of the two vertical parts of the U-shaped frame (21). Movable components (24) are fixedly attached to the outer surfaces of the two fixed tubes (22), and a push rod (26) is fixed between the two movable components (24). A clamping component (25) is fixedly connected to the outer surfaces of the two fixed tubes (22), and a positioning component (23) is fixedly attached to the outer surface of the fixed tube (22) on the side away from the connecting component (15). The clamping component (25) includes annular blocks (251), and each of the two annular blocks (251) is provided with a plurality of annular array sliding grooves (252). A set of annular array sliding blocks (254) is slidably installed on the side of the two annular blocks (251) that are close to each other. A connecting rod (255) that is adapted to the sliding grooves (252) on both sides is fixed through the plurality of sliding blocks (254) in the same group. The rotation of the two movable parts (24) causes the two sets of sliding blocks (254) to move along the sliding groove (252) under the action of the connecting rod (255). The two sets of sliding blocks (254) adopt a split design to flexibly clamp the cable and seal the connection of the two annular blocks (251).

2. The sealing structure of the underground cable branch box according to claim 1, characterized in that, The inner walls of the branch box (10) are fixed with straight plates (11). Two symmetrical Z-shaped blocks (12) are rotatably connected between the inner walls of the branch box (10). One of the Z-shaped blocks (12) has a sealing plate (13) fixed on one side. The other Z-shaped block (12) has a sealing plate (14) that matches the sealing plate (13) fixed on the lower side of the horizontal part. The horizontal part of the Z-shaped block (12) is inlaid with a silicone sheet that matches the straight plate (11). The sealing plate (14) has a silicone sheet that matches the sealing plate (13) inlaid on one side.

3. The sealing structure of the underground cable branch box according to claim 1, characterized in that, The positioning component (23) includes a mounting tube (231) fixed to the outer surface of the fixing tube (22). An annular gasket (232) is fixed in the inner cavity of the mounting tube (231). A plurality of positioning rods (235) in an annular array are rotatably mounted in the inner cavity of the mounting tube (231) through a torsion spring connector. A plurality of arc-shaped pieces (234) in an annular array are rotatably mounted in the inner cavity of the mounting tube (231) through a torsion spring connector. An elastic sealing ring (233) that is adapted to the inner surface of the annular gasket (232) is fixed together on the outer surface of the plurality of arc-shaped pieces (234).

4. The sealing structure of an underground cable branch box according to claim 3, characterized in that, One end of the mounting tube (231) is fixed with a connecting ring (236), the outer surface of the connecting ring (236) is threaded with a sealing cap (237), the inner surface of the connecting ring (236) is provided with a waterproof groove (238), and the inner surface of the connecting ring (236) is fixed with a flat-topped conical tube (239).

5. The sealing structure of an underground cable branch box according to claim 1, characterized in that, The movable component (24) includes a fixed ring (241) fixed on a fixed tube (22). The outer surface of the fixed ring (241) is provided with a plurality of annular array grooves (243). A compression spring (242) is fixed in the inner cavity of each of the plurality of grooves (243). An annular plate (244) is rotatably connected to one side of the fixed ring (241). An arc-shaped groove (245) is provided on one side of the annular plate (244).

6. The sealing structure of an underground cable branch box according to claim 5, characterized in that, The outer surface of the fixed ring (241) is rotatably connected to a rotating ring (247) which is fixedly connected to the annular plate (244). The inner surface of the rotating ring (247) is fixed with a plurality of push blocks (246) that are adapted to the compression spring (242). The outer surface of the rotating ring (247) is fixed with a straight block (248). The straight block (248) is fixedly connected to the push rod (26).

7. The sealing structure of an underground cable branch box according to claim 6, characterized in that, The annular block (251) is rotatably connected to the annular plate (244), and an annular sealing plate (253) is fixed between the two annular blocks (251). Multiple connecting rods (255) on the same side are adapted to the arc groove (245) on the annular plate (244). Multiple sliding blocks (254) on the same side are all fixed with elastic blocks (256) on the side near the center of the sliding groove (252).

8. The sealing structure of an underground cable branch box according to claim 1, characterized in that, A support member (27) is fixed to the outer surface of the fixed tube (22) near the connecting component (15). The support member (27) includes a ring block (271) fixed to the fixed tube (22). A ring plate (272) is rotatably connected to one side of the ring block (271). A plurality of ring array connecting springs (273) are fixed to one side of the ring plate (272). A moving tube (275) is fixed to one side of the plurality of connecting springs (273). A plurality of ring array guide rods (274) are fixed to one side of the ring plate (272). The plurality of guide rods (274) are slidably connected to the moving tube (275). Two ring array locking blocks (276) are fixed to the outer surface of the moving tube (275). A limiting component (277) for limiting the movement trajectory of the locking blocks (276) is fixed to one side of the ring block (271).

9. The sealing structure of an underground cable branch box according to claim 8, characterized in that, The limiting component (277) includes a limiting ring plate (2771) fixedly connected to the ring block (271). The inner surface of the limiting ring plate (2771) has two slots (2772) that are adapted to the locking block (276). The outer surface of the limiting ring plate (2771) is fixed with a limiting tube (2773), and the inner surface of the limiting tube (2773) is fixed with an annular stop bar (2774).

10. The sealing structure of an underground cable branch box according to claim 8, characterized in that, The outer surface of the movable tube (275) is fixed with a rotating block (278). Both sides of the rotating block (278) are rotatably connected to L-shaped brackets (279) by torsion springs. The ends of the two L-shaped brackets (279) away from the rotating block (278) are rotatably mounted with guide wheels (280).

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