Buried cable branch box and sealing structure thereof

Abstract

This invention relates to the field of power equipment technology, specifically to an underground cable branch box and its sealing structure, including a heat dissipation bend, a plug-in delivery pipe, a delivery connection pipe, a side sealing plate, a box body, a wiring pipe, a rubber sealing ring, a heat-conducting plate, a locking ring, and a second fixing bolt. The side sealing plate is fixedly installed on both sides of the box body by bolts, and the heat-conducting plate is uniformly fixedly connected to the side end of the side sealing plate away from the box body. This invention adopts a staggered splicing structure of an inner sealing cover and an outer sealing protective cover, combined with the rubber sealing ring at the cable inlet end and the locking ring for compression sealing, forming a sealing barrier that can prevent the infiltration of groundwater moisture and underground corrosive substances, avoid corrosion problems of internal moisture-induced short-circuit components, and significantly improve service life. Through the built-in heat dissipation fan, the delivery connection pipe plug-in delivery pipe, and the downward-facing heat dissipation bend, the high temperature generated by the wiring terminals inside the box can be quickly discharged.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, specifically to an underground cable branch box and its sealing structure. Background Technology

[0002] With the acceleration of urbanization and the continuous improvement of power distribution network construction, underground cable lines have been widely used. As an important component of underground cable lines, the performance of buried cable branch boxes directly affects the safe and stable operation of the power distribution network. Traditional buried cable branch boxes have insufficient sealing performance, making them susceptible to groundwater seepage, which can lead to internal dampness, decreased insulation performance, and short circuit faults. They also have limited corrosion resistance, as corrosive substances in the underground environment can easily corrode the box and internal components, shortening their service life. Furthermore, they have poor resistance to settlement, as uneven settlement of the underground soil can easily cause deformation of the box and loosening of cable joints. In addition, the high temperature at the connection points inside the box cannot be dissipated, making the inside of the buried box prone to high temperatures. Therefore, an improved device is needed to address these problems. Summary of the Invention

[0003] To address the problems in the prior art, the present invention provides an underground cable branch box and its sealing structure.

[0004] The technical solution adopted by this invention to solve its technical problem is: an underground cable branch box and its sealing structure, including a heat dissipation bend, a plug-in conveying pipe, a conveying connecting pipe, a side sealing plate, a box body, a wiring pipe, a rubber sealing ring, a heat-conducting plate, a locking ring, and a second fixing bolt. The side sealing plate is fixedly installed on both sides of the box body by bolts. The heat-conducting plate is uniformly fixedly connected to the side end of the side sealing plate away from the box body. The wiring pipe is uniformly fixedly connected to the middle of both sides of the box body. The wiring pipe communicates with the interior of the box body. The rubber sealing ring is fixedly connected to the outer end of the wiring pipe. The locking ring is distributed on both sides of the rubber sealing ring, and the second fixing bolt is uniformly threaded between the side ends of the locking ring. The conveying connecting pipe is fixedly connected to the middle of the upper end of the box body. The bottom end of the plug-in conveying pipe is clamped to the upper end of the conveying connecting pipe. The heat dissipation bend is fixedly connected to the plug-in conveying pipe by a flange. The heat dissipation bend, the plug-in conveying pipe, the conveying connecting pipe, and the interior of the box body are in communication. The upper end opening of the heat dissipation bend faces downward.

[0005] A sealing structure for an underground cable branch box includes a sealing and protective body. The sealing and protective body includes a first inner sealing cover, a second inner sealing cover, a sliding splicing plate, and a guide plate. The sliding splicing plate is symmetrically fixedly installed on both sides of the first and second inner sealing covers. The guide plate is fixedly connected to the middle of the bottom end of the sliding splicing plate and slides into the interior of the sliding splicing plate on the second inner sealing cover. The first and second inner sealing covers are mirror-symmetrically distributed.

[0006] Specifically, the sealing and protective body further includes a first sealing and protective cover, a sliding splicing slot, a second sealing and protective cover, a docking frame, a first fixing bolt, and a limiting plate. The first and second sealing and protective covers are mirror-symmetrically distributed. The sliding splicing slot is opened inside both ends of the first and second sealing and protective covers. The limiting plate is fixedly connected to both ends of the first sealing and protective cover. The docking frame is symmetrically fixedly installed on both ends of the second sealing and protective cover. The first fixing bolt is symmetrically threaded into the docking frame. The limiting plate is inserted into the interior of the docking frame. The front end of the first fixing bolt is inserted into the interior of the limiting plate.

[0007] Specifically, the sliding splicing plate is adapted to the sliding splicing slot, and the sliding splicing plate is slidably engaged inside the sliding splicing slot. The conveying connecting pipe passes through the middle of the first sealing protective cover and the first inner sealing cover. The first inner sealing cover and the second inner sealing cover are located between the side sealing plate and the box body and the first sealing protective cover and the second sealing protective cover. The splicing seam between the first inner sealing cover and the second inner sealing cover is staggered from the splicing seam between the first sealing protective cover and the second sealing protective cover.

[0008] Specifically, the bottom end of the second sealing protective cover is fixedly connected to an anti-settlement support plate, and a side sliding support plate is slidably inserted into the side end of the anti-settlement support plate. A third fixing bolt is threaded into the upper part of the side end of the anti-settlement support plate, and the bottom end of the third fixing bolt is in pressure contact with the side sliding support plate.

[0009] Specifically, the fixed installation part includes a second limiting frame, a fifth fixing bolt, and a support fixing frame. The support fixing frame is slidably engaged with the inner side of the second limiting frame. The fifth fixing bolt is evenly threaded into the second limiting frame, and the end of the fifth fixing bolt is in contact with the support fixing frame.

[0010] Specifically, the fixed detection unit includes a first limiting frame, a fourth fixing bolt, a detection support frame, a fixed mounting frame, a fixing plate, a detection spring, and a pressure sensor. The detection support frame is slidably engaged inside the first limiting frame. The fourth fixing bolt is evenly threaded into the first limiting frame, and the end of the fourth fixing bolt is in contact with the detection support frame. The fixed mounting frame is located on the outer side of the detection support frame away from the first limiting frame. The fixing plate is evenly and symmetrically fixedly installed on the outer end of the fixed mounting frame. The detection springs are symmetrically distributed on both sides of the outer end of the detection support frame, and the detection springs are fixedly installed between the detection support frame and the fixed mounting frame by fixing plates and bolts. The pressure sensor is located between the detection spring and the fixed mounting frame.

[0011] Specifically, a laser rangefinder is fixedly installed in the middle of the inner end of the pressure sensor, and the detection support frame is located in front of the laser rangefinder.

[0012] Specifically, the first limiting frame and the second limiting frame are fixedly connected to the outer ends of the first sealing protective cover and the second sealing protective cover, respectively.

[0013] Specifically, the interior of the enclosure is equipped with a temperature sensor, a humidity sensor, and a cooling fan.

[0014] The beneficial effects of this invention are:

[0015] I. This invention adopts a staggered splicing structure of an inner sealing cover and an outer sealing protective cover, combined with the rubber sealing ring and locking ring at the cable inlet end for compression sealing, forming a sealing barrier that can prevent groundwater moisture and underground corrosive substances from seeping in, avoiding the problem of corrosion of internal damp short-circuit components, and greatly improving service life. Through the built-in heat dissipation fan, combined with the delivery connection pipe and the downward-facing heat dissipation bend, the high temperature generated by the wiring terminals inside the box can be quickly discharged. The downward-facing opening design of the heat dissipation bend can not only dissipate heat but also prevent rainwater and cement backflow, eliminating the reduction in insulation performance caused by heat accumulation in the underground confined space.

[0016] II. The bottom anti-settlement support plate of this invention is combined with a retractable side sliding support plate and a laterally adjustable support fixing frame. The support area can be flexibly adjusted according to different geological conditions, effectively resisting uneven soil settlement, preventing box deformation and cable joint loosening, and ensuring the stability of wiring connections. The integrated temperature and humidity sensor enables real-time monitoring of the internal environment. Combined with a laser rangefinder and pressure sensor, it can monitor and warn of box settlement and displacement online, eliminating the need for frequent manual excavation and inspection. Fault prediction is timely, reducing operation and maintenance costs and power supply risks. The sealed protective cover adopts a splicing and snap-fit ​​design, which is convenient for disassembly and maintenance. The cable inlet sealing structure can be adapted to different specifications of cables. The overall installation and construction efficiency is high, and it is suitable for various complex buried scenarios of urban underground power distribution networks. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional structural diagram of the main body from a frontal perspective in this invention;

[0019] Figure 2 This is a schematic diagram of the sealing and protective main structure in this invention;

[0020] Figure 3 This is a schematic diagram of the inner sealing cover in its disassembled state in this invention;

[0021] Figure 4 This is a schematic diagram of the box structure in this invention;

[0022] Figure 5 This is a schematic diagram of the bottom structure of the second sealing protective cover in this invention;

[0023] Figure 6 This is a schematic diagram of the fixed detection unit structure in the present invention;

[0024] Figure 7 This is a side-view perspective three-dimensional structural diagram of the fixed detection unit in this invention;

[0025] Figure 8 This is a schematic diagram of the fixed mounting part in the present invention.

[0026] In the diagram: 1-Heat dissipation bend, 2-Insertion conveying pipe, 3-Conveying connection pipe, 4-Sealed protective body, 5-First sealed protective cover, 6-First inner sealing cover, 7-Second inner sealing cover, 8-Sliding splicing slot, 9-Second sealed protective cover, 10-Docking frame, 11-First fixing bolt, 12-Sliding splicing plate, 13-Limiting plate, 14-Side sealing plate, 15-Box body, 16-Wiring pipe, 17-Rubber sealing ring, 18-Heat conduction plate, 19-Guide plate, 20- - Locking ring, 21- Second fixing bolt, 22- Fixing detection part, 23- Fixing installation part, 24- Anti-settlement support plate, 25- Side sliding support plate, 26- Third fixing bolt, 27- First limit frame, 28- Fourth fixing bolt, 29- Detection support frame, 30- Fixing installation frame, 31- Fixing plate, 32- Detection spring, 33- Laser rangefinder sensor, 34- Pressure sensor, 35- Second limit frame, 36- Fifth fixing bolt, 37- Support fixing frame. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] The invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1 , Figure 3 and Figure 4 As shown, an underground cable branch box and its sealing structure according to the present invention include a heat dissipation bend 1, a plug-in conveying pipe 2, a conveying connection pipe 3, a side sealing plate 14, a box body 15, a wiring pipe 16, a rubber sealing ring 17, a heat-conducting plate 18, a locking ring 20, and a second fixing bolt 21. The side sealing plate 14 is fixedly installed on both sides of the box body 15 by bolts. The heat-conducting plate 18 is uniformly fixedly connected to the side end of the side sealing plate 14 away from the box body 15. The wiring pipe 16 is uniformly fixedly connected to the middle of both sides of the box body 15, and the wiring pipe 16 communicates with the interior of the box body 15. The rubber sealing ring 17 is fixedly connected to the outer end of the wiring pipe 16. The locking ring 20 is distributed on both sides of the rubber sealing ring 17, and the second fixing bolt 21. Two fixing bolts 21 are evenly threaded and inserted between the side ends of the locking ring 20. The conveying connecting pipe 3 is fixedly connected to the upper middle part of the box 15. The bottom end of the insertion conveying pipe 2 is clamped to the upper end of the conveying connecting pipe 3. The heat dissipation elbow 1 is fixedly connected to the insertion conveying pipe 2 through the flange. The heat dissipation elbow 1, the insertion conveying pipe 2, the conveying connecting pipe 3 and the interior of the box 15 are connected. The upper end of the heat dissipation elbow 1 is open downward. The locking ring 20 can squeeze the rubber sealing ring 17 so that the cable conveyed in the rubber sealing ring 17 can be sealed by the rubber sealing ring 17. This allows the moisture and soil from the ground to enter the interior of the box 15 through the cable and the wiring pipe 16.

[0030] like Figure 2 , Figure 4 and Figure 5As shown, a sealing structure for an underground cable branch box includes a sealing and protective body 4. The sealing and protective body 4 includes a first inner sealing cover 6, a second inner sealing cover 7, a sliding splicing plate 12, and a guide plate 19. The sliding splicing plate 12 is symmetrically fixedly installed on both sides of the first inner sealing cover 6 and the second inner sealing cover 7. The guide plate 19 is fixedly connected to the middle of the bottom end of the sliding splicing plate 12, and the guide plate 19 slidably engages with the interior of the sliding splicing plate 12 provided on the second inner sealing cover 7. The first inner sealing cover 6 and the second inner sealing cover 7 are mirror-symmetrically distributed, providing a seal. The protective body 4 also includes a first sealing protective cover 5, a sliding splicing groove 8, a second sealing protective cover 9, a docking frame 10, a first fixing bolt 11, and a limiting plate 13. The first sealing protective cover 5 and the second sealing protective cover 9 are mirror-symmetrically distributed. The sliding splicing groove 8 is opened inside both ends of the first sealing protective cover 5 and the second sealing protective cover 9. The limiting plate 13 is fixedly connected to both ends of the first sealing protective cover 5 outside. The docking frame 10 is symmetrically fixedly installed on both ends of the second sealing protective cover 9 outside. The first fixing bolt 11 is symmetrically threaded into the docking frame 10. The limiting plate 13 is inserted into the docking frame 10, and the front end of the first fixing bolt 11 is inserted into the limiting plate 13. The sliding splicing plate 12 is adapted to the sliding splicing groove 8, and the sliding splicing plate 12 is slidably engaged in the sliding splicing groove 8. The conveying connecting pipe 3 passes through the middle of the first sealing protective cover 5 and the first inner sealing cover 6. The first inner sealing cover 6 and the second inner sealing cover 7 are located between the side sealing plate 14 and the box body 15 and the first sealing protective cover 5 and the second sealing protective cover 9. The splicing seam between the first inner sealing cover 6 and the second inner sealing cover 7 is... The joints between the first sealing protective cover 5 and the second sealing protective cover 9 are staggered. The first inner sealing cover 6 and the second inner sealing cover 7 in the sealing protective body 4 can seal the box 15 for the first time. The first inner sealing cover 6 and the second inner sealing cover 7 on the outside can seal the box 15 again, so that the box 15 can be stably buried underground. The side end of the first sealing protective cover 5 is provided with a fixed detection part 22 and a fixed installation part 23. The side end of the second sealing protective cover 9 is provided with the same fixed installation part 23 as the side end of the first sealing protective cover 5.

[0031] The bottom end of the second sealing protective cover 9 is fixedly connected to an anti-settlement support plate 24. Side sliding support plates 25 are slidably inserted into the inside of the side end of the anti-settlement support plate 24. The upper part of the side end of the anti-settlement support plate 24 is threaded with a third fixing bolt 26, and the bottom end of the third fixing bolt 26 is in contact with the side sliding support plate 25. By turning the third fixing bolt 26, each side sliding support plate 25 can be pulled out from the inside of the anti-settlement support plate 24, adjusting and controlling the support area of ​​the anti-settlement support plate 24, so that the sealing protective body 4 and the box 15 can be stably buried underground.

[0032] like Figure 8 As shown, the fixed installation part 23 includes a second limiting frame 35, a fifth fixing bolt 36, and a support fixing frame 37. The support fixing frame 37 is slidably engaged with the outer side of the second limiting frame 35. The fifth fixing bolt 36 is evenly threaded into the second limiting frame 35, and the end of the fifth fixing bolt 36 is pressed against the support fixing frame 37. After being fixed by the support fixing frame 37, the sealing and protective body 4 and the inner box 15 can be stably buried underground. Pulling out the support fixing frame 37 can adjust and control the support area of ​​the support fixing frame 37, so that the sealing and protective body 4 and the box 15 can be stably installed underground.

[0033] like Figure 6 and Figure 7 As shown, the fixed detection unit 22 includes a first limiting frame 27, a fourth fixing bolt 28, a detection support frame 29, a fixed mounting frame 30, a fixing plate 31, a detection spring 32, and a pressure sensor 34. The detection support frame 29 is slidably engaged inside the first limiting frame 27. The fourth fixing bolt 28 is evenly threaded into the first limiting frame 27, and the end of the fourth fixing bolt 28 is in contact with the detection support frame 29. The fixed mounting frame 30 is located on the outside of the detection support frame 29 away from the first limiting frame 27. The fixing plate 31 is evenly and symmetrically fixedly installed on the outer end of the fixed mounting frame 30. The detection springs 32 are symmetrically distributed on both sides of the outer end of the detection support frame 29. The spring 32 is fixedly installed between the detection support frame 29 and the fixed mounting frame 30 by a fixing plate and bolts. The pressure sensor 34 is set between the detection spring 32 and the fixed mounting frame 30. A laser rangefinder 33 is fixedly installed in the middle of the inner end of the pressure sensor 34. The detection support frame 29 is located in front of the laser rangefinder 33. When the fixed mounting frame 30 is fixed by the fixing plate 31, when the box 15 and the external sealing and protection body 4 settle, the pressure detected by the pressure sensor 34 changes. At this time, the laser rangefinder 33 detects the change in the distance value between itself and the detection support frame 29, which can help determine whether the box 15 has settled.

[0034] The first limiting frame 27 and the second limiting frame 35 are respectively fixedly connected to the outer ends of the first sealing protective cover 5 and the second sealing protective cover 9. After being fixedly set, the first sealing protective cover 5 and the second sealing protective cover 9 are limited and fixed to prevent settlement.

[0035] The enclosure 15 is equipped with a temperature sensor, a humidity sensor, and a cooling fan. It can detect the temperature and humidity inside the enclosure 15, and the cooling fan can discharge the heat inside the enclosure 15 to the outside through the delivery connection pipe 3, the insertion delivery pipe 2, and the heat dissipation bend pipe 1.

[0036] Working principle: The enclosure 15 is buried in a designated underground location. The cable passes through the wiring conduit 16 into the enclosure 15. Tightening the second fixing bolt 21 causes the locking ring 20 to contract, squeezing the rubber sealing ring 17 to grip the outer wall of the cable, completing the first sealing barrier at the cable entry point and preventing groundwater and moisture from seeping into the enclosure 15 along the gap between the cable and the conduit. The sealing and protection body 4 adopts a double-layer sealing cover with staggered splicing. The first inner sealing cover 6 and the second inner sealing cover 7 are slidably spliced ​​together by the sliding splicing plate 12 and the guide plate 19 to form an inner layer seal. The first sealing protective cover 5 and the second sealing protective cover 7 are connected by sliding splicing plate 12 and guide plate 19 to form an inner layer seal. Cover 9 is inserted into docking frame 10 by limiting card plate 13 and then locked by first fixing bolt 11 to form outer seal. The splicing seams of the inner and outer sealing covers are staggered to form a labyrinth-like sealing barrier to prevent underground mud and water corrosive media from intruding. Temperature and humidity sensors built into box 15 collect internal temperature and humidity data in real time. When the internal temperature exceeds the standard, the cooling fan starts automatically and transports the heat in box 15 to the heat dissipation bend 1 through the conveying connection pipe 3 and the insertion conveying pipe 2 to discharge. The upper opening of the heat dissipation bend 1 faces downward to prevent rainwater and mud from flowing back into the box.

[0037] According to the geological conditions, tighten the third fixing bolt 26 to pull the side sliding support plate 25 outward from the inside of the anti-settlement support plate 24, expanding the bottom support area. Simultaneously adjust the fixed installation part 23, tighten the fifth fixing bolt 36 to pull the support fixing frame 37 out from the second limit frame 35, increasing the lateral support range, making the device as a whole stable and in close contact with the soil, resisting uneven soil settlement. The fixed detection part 22 is fixed to the soil through the fixing plate 31. The fixed installation frame 30 is lightweight and fixed by the fixing plate 31, so it will not be affected by its own weight settlement. When the box 15 settles due to its own weight, the pressure sensor 34 will detect the sudden change in pressure value. The laser range sensor 33 can detect the change in distance between itself and the detection support frame 29 in real time. By changing the data, it can accurately determine whether the box 15 has settled and displaced, realizing settlement early warning. The heat conduction plate 18 evenly arranged on the outside of the side sealing plate 14 can quickly dissipate the heat generated by the internal wiring terminals of the box 15. With the help of the internal cooling fan, it can prevent the heat accumulation inside the box 15 from causing insulation aging.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A buried cable branch box, characterized in that, The enclosure includes a heat dissipation bend (1), a plug-in delivery pipe (2), a delivery connection pipe (3), a side sealing plate (14), a housing (15), a wiring pipe (16), a rubber sealing ring (17), a heat-conducting plate (18), a locking ring (20), and a second fixing bolt (21). The side sealing plate (14) is fixedly installed on both sides of the housing (15) by bolts. The heat-conducting plate (18) is evenly fixedly connected to the side end of the side sealing plate (14) away from the housing (15). The wiring pipe (16) is evenly fixedly connected to the middle of both sides of the housing (15). The wiring pipe (16) communicates with the interior of the housing (15). The rubber sealing ring (17) is fixed. The locking ring (20) is distributed on both sides of the rubber sealing ring (17) and the second fixing bolt (21) is evenly threaded between the side ends of the locking ring (20). The conveying connecting pipe (3) is fixedly connected to the upper middle part of the box (15). The bottom end of the insertion conveying pipe (2) is clamped to the upper end of the conveying connecting pipe (3). The heat dissipation bend (1) is fixedly connected to the insertion conveying pipe (2) through a flange. The heat dissipation bend (1), the insertion conveying pipe (2), the conveying connecting pipe (3) and the box (15) are connected internally. The upper end of the heat dissipation bend (1) is open downwards.

2. A sealing structure for an underground cable branch box, applicable to the underground cable branch box as described in claim 1, characterized in that: The system includes a sealing and protective body (4), which includes a first inner sealing cover (6), a second inner sealing cover (7), a sliding splicing plate (12), and a guide plate (19). The sliding splicing plate (12) is symmetrically fixedly installed on both sides of the first inner sealing cover (6) and the second inner sealing cover (7). The guide plate (19) is fixedly connected to the middle of the bottom end of the sliding splicing plate (12), and the guide plate (19) is slidably engaged inside the sliding splicing plate (12) provided on the second inner sealing cover (7). The first inner sealing cover (6) and the second inner sealing cover (7) are symmetrically distributed in a mirror image.

3. The sealing structure of an underground cable branch box according to claim 2, characterized in that: The sealing and protective body (4) also includes a first sealing and protective cover (5), a sliding splicing slot (8), a second sealing and protective cover (9), a docking frame (10), a first fixing bolt (11), and a limiting plate (13). The first sealing and protective cover (5) and the second sealing and protective cover (9) are mirror-symmetrically distributed. The sliding splicing slot (8) is opened inside both ends of the first sealing and protective cover (5) and the second sealing and protective cover (9). The limiting plate (13) is fixedly connected to both ends of the first sealing and protective cover (5). The docking frame (10) is symmetrical. The first fixing bolt (11) is symmetrically threaded into the docking frame (10) and the first fixing bolt (11) is fixedly installed on the outside of both ends of the second sealing protective cover (9). The first fixing bolt (11) is symmetrically threaded into the docking frame (10). The limiting plate (13) is inserted into the interior of the docking frame (10). The front end of the first fixing bolt (11) is inserted into the interior of the limiting plate (13). The side end of the first sealing protective cover (5) is provided with a fixing detection part (22) and a fixing installation part (23). The side end of the second sealing protective cover (9) is provided with the same fixing installation part (23) as the side end of the first sealing protective cover (5).

4. The sealing structure of an underground cable branch box according to claim 3, characterized in that: The sliding splicing plate (12) is adapted to the sliding splicing slot (8). The sliding splicing plate (12) is slidably engaged inside the sliding splicing slot (8). The conveying connecting pipe (3) passes through the middle of the first sealing protective cover (5) and the first inner sealing cover (6). The first inner sealing cover (6) and the second inner sealing cover (7) are located between the side sealing plate (14) and the box body (15) and the first sealing protective cover (5) and the second sealing protective cover (9). The splicing seam between the first inner sealing cover (6) and the second inner sealing cover (7) is misaligned with the splicing seam between the first sealing protective cover (5) and the second sealing protective cover (9).

5. The sealing structure of an underground cable branch box according to claim 4, characterized in that: The bottom end of the second sealing protective cover (9) is fixedly connected to an anti-settlement support plate (24). The side end of the anti-settlement support plate (24) is slidably inserted with a side sliding support plate (25). The upper part of the side end of the anti-settlement support plate (24) is threaded with a third fixing bolt (26), and the bottom end of the third fixing bolt (26) is pressed against the side sliding support plate (25).

6. The sealing structure of an underground cable branch box according to claim 5, characterized in that: The fixed installation part (23) includes a second limiting frame (35), a fifth fixing bolt (36) and a support fixing frame (37). The support fixing frame (37) is slidably engaged with the inner side of the second limiting frame (35). The fifth fixing bolt (36) is evenly threaded into the second limiting frame (35), and the end of the fifth fixing bolt (36) is pressed against the support fixing frame (37).

7. The sealing structure of an underground cable branch box according to claim 6, characterized in that: The fixed detection unit (22) includes a first limiting frame (27), a fourth fixing bolt (28), a detection support frame (29), a fixed mounting frame (30), a fixing plate (31), a detection spring (32), and a pressure sensor (34). The detection support frame (29) is slidably engaged inside the first limiting frame (27). The fourth fixing bolt (28) is evenly threaded into the first limiting frame (27), and the end of the fourth fixing bolt (28) is pressed against the detection support frame (29). The fixed mounting frame (30) 30) The detection support frame (29) is located on the outside of the first limiting frame (27). The fixing plate (31) is uniformly and symmetrically fixed at the outer end of the fixed mounting frame (30). The detection springs (32) are symmetrically distributed on both sides of the outer end of the detection support frame (29). The detection springs (32) are fixed between the detection support frame (29) and the fixed mounting frame (30) by fixing plate and bolt. The pressure sensor (34) is located between the detection springs (32) and the fixed mounting frame (30).

8. The sealing structure of an underground cable branch box according to claim 7, characterized in that: A laser rangefinder (33) is fixedly installed in the middle of the inner end of the pressure sensor (34), and the detection support frame (29) is located in front of the laser rangefinder (33).

9. The sealing structure of an underground cable branch box according to claim 8, characterized in that: The first limiting frame (27) and the second limiting frame (35) are respectively fixedly connected to the outer ends of the first sealing protective cover (5) and the second sealing protective cover (9).

10. The sealing structure of an underground cable branch box according to claim 9, characterized in that: The enclosure (15) is equipped with a temperature sensor, a humidity sensor, and a cooling fan.

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