Buried cable branch box

Abstract

This invention discloses an underground cable distribution box, comprising an underground box and a base. The underground box is movably mounted on the base, which has three positioning shafts. Each positioning shaft has a positioning hole with an outlet. A rotating shaft and a lifting shaft are rotatably mounted within the positioning holes. The lifting shaft is rotatably connected to the bottom of the underground box. The rotating shaft and the lifting shaft are coaxial and linked to each other so that the rotating shaft drives the lifting shaft to rotate synchronously. A cooperating structure is provided between the rotating shaft and the lifting shaft to convert the rotational trend of the lifting shaft into a lifting trend when the rotating shaft rotates. The base has an interlocking structure for driving the three rotating shafts to rotate synchronously and a drive structure for cooperating with the interlocking structure. A drive shaft for cooperating with the drive structure is detachably connected to the base. This invention solves the problem that in existing underground cable distribution boxes, the limited working space requires operators to enter the pit and crouch or bend over to operate.

Description

Technical Field

[0001] This invention relates to the field of cable branch box technology, specifically to an underground cable branch box. Background Technology

[0002] With the rapid advancement of the modernization of the power industry, cable distribution boxes, as key equipment for cable connection and branching in power systems, are widely used in various scenarios such as urban power distribution networks, industrial park power supply, low-voltage power distribution systems in residential areas, and high-speed railway power supply. Based on different installation methods, cable distribution boxes are mainly divided into two categories: floor-mounted and underground. Underground cable distribution boxes, due to their advantages of saving ground space, reducing exposed facilities, improving safety, and not disrupting the ground landscape, are widely used in places with high requirements for environmental aesthetics and space utilization, such as roads, green belts, city squares, parks, and along high-speed railway lines.

[0003] Currently, the conventional installation method for underground cable distribution boxes involves excavating an underground pit and burying the main body of the distribution box inside. Only inspection wells or covers are installed on the surface, achieving concealed installation. Simultaneously, its internal structure facilitates cable branching, switching, and convenient connection of cables with different cross-sections, to some extent replacing cable joints, reducing line failure rates, and improving power supply reliability. However, the existing structural design of underground cable distribution boxes has significant flaws, especially in terms of inconvenience during installation and subsequent maintenance.

[0004] In existing technologies, the underground cable distribution box is typically fixed directly inside the pit. The pit's size is only sufficient to accommodate the box, leaving extremely limited working space for operators. When wiring, internal component debugging, or subsequent troubleshooting and component replacement are required, operators must enter the cramped pit. Due to the limited space, they are forced to operate in uncomfortable postures such as crouching or lying down. This severely restricts the flexibility of their movements, leading to inconvenient tool use, low operational efficiency, and increased risk of misoperation, thus affecting the quality of installation and maintenance.

[0005] Meanwhile, the increased labor intensity for operators working in the pit, often bending and crouching, easily leads to fatigue over prolonged periods. Furthermore, the dim lighting and complex environment within the pit pose safety hazards such as bumps and falls, further reducing the safety and convenience of the work. In addition, existing underground cable distribution boxes lack a flexible adjustable structure, making it impossible to adjust the box height according to operational needs. This results in operators consistently lacking a comfortable and safe working space. These problems have long plagued the installation and maintenance of underground cable distribution boxes, limiting their further improvement in application effectiveness. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an underground cable branch box, which solves the problem that operators have to enter the pit and bend or lie down to operate the existing underground cable branch boxes due to the limited working space.

[0007] To achieve the above objectives, the present invention provides an underground cable branch box, including an underground box and a base for pre-installation in an external foundation pit. The underground box is movably mounted above the base. The base is provided with three positioning shafts arranged in a triangular shape. The end of each positioning shaft is an insertion end for insertion into the ground at the bottom of the foundation pit. Each positioning shaft has a positioning hole along its height direction, and the positioning hole connects to the starting end of the positioning shaft to form an outlet. A rotating shaft and a lifting shaft are rotatably mounted in the positioning hole. The starting end of the lifting shaft is rotatably connected to the bottom of the underground box. The rotating shaft and the lifting shaft are coaxial and linked to drive the lifting shaft to rotate synchronously when the rotating shaft rotates. A cooperating structure is provided between the rotating shaft and the lifting shaft to convert the rotation trend of the lifting shaft into a lifting trend when the rotating shaft rotates. The base is provided with an interlocking structure for driving the three rotating shafts to rotate synchronously and a drive structure for cooperating with the interlocking structure to open and close the interlocking structure. A drive shaft is detachably connected to the base for cooperating with the drive structure to allow external operators to open and close the drive structure from outside the foundation pit.

[0008] The advantages of adopting the above technical solution are as follows: The base can be pre-installed in the pit, achieving precise positioning and stable installation of the underground box. The three triangularly distributed positioning shafts enhance the connection stability between the base and the bottom of the pit, preventing base misalignment. The positioning holes provide installation space for the rotating shaft and lifting shaft, ensuring smooth rotation. The rotating shaft and lifting shaft are coaxially linked, and the combined structure converts rotational tendencies into lifting tendencies, achieving smooth lifting of the underground box. The interlocking structure drives the three rotating shafts to rotate synchronously, ensuring uniform force distribution and preventing tilting during the lifting of the underground box. Furthermore, the drive structure is linked to the drive shaft, and the drive shaft is detachable, allowing operators to complete operations from outside the pit without needing to enter and crouch or bend over, improving operational convenience and safety, while simplifying the installation and maintenance process of the underground box.

[0009] The present invention further comprises: the rotating shaft having a rotating hole along its height direction and the rotating hole connecting to the beginning of the rotating shaft to form a lifting port; the mating structure includes a first threaded groove formed on the inner peripheral wall of the rotating hole along the height direction of the rotating shaft and a second threaded groove formed on the outer peripheral wall of the lifting shaft along the height direction of the lifting shaft, the first threaded groove and the second threaded groove being engaged.

[0010] The advantages of adopting the above technical solution are as follows: The above technology provides space for the installation and lifting of the lifting shaft by opening a rotating hole and a lifting port on the rotating shaft, ensuring smooth movement of the lifting shaft; the mating structure uses a first threaded groove and a second threaded groove meshing configuration, which is simple in structure and reliable in transmission, and can stably convert the rotational trend of the rotating shaft into the lifting trend of the lifting shaft, ensuring that the lifting shaft drives the underground box to rise and fall smoothly, avoiding jamming or deviation during the lifting process; the above-mentioned threaded meshing can achieve precise positioning of the lifting shaft, preventing loosening after the underground box is raised and lowered, improving the stability of the underground box after installation, while simplifying the processing and assembly process of the mating structure, reducing production costs, and adapting to the concealed installation requirements of underground cable branch boxes.

[0011] The invention further comprises: a driving cavity at the center of the base; an interlocking structure including a main shaft; a first base rotatably connected to the inner wall of the driving cavity at both ends of the main shaft; the first base being fixed to the inner wall of the driving cavity; three auxiliary gear discs coaxially connected to the main shaft; a driven gear disc coaxially connected to the beginning of the rotating shaft; the three auxiliary gear discs corresponding one-to-one with the three driven gear discs; a transmission chain belt driving each auxiliary gear disc and its corresponding driven gear disc; the links of the transmission chain belt partially meshing with the teeth of the corresponding auxiliary gear disc and the teeth of the driven gear disc; a first through groove for the links of the transmission chain belt to pass through at the position corresponding to the position of the transmission chain belt on the positioning shaft; and a second through groove for the links of the transmission chain belt to pass through at the position corresponding to the position of the transmission chain belt on the base.

[0012] The advantages of adopting the above technical solution are as follows: The technology provides installation space for the interlocking structure by setting a drive cavity at the center of the base, ensuring stable operation of the interlocking structure. The main shaft is rotatably connected to the inner wall of the drive cavity through the first base, improving the smoothness of the main shaft rotation. Furthermore, the three auxiliary gear discs correspond one-to-one with the three driven gear discs, achieving synchronous transmission with the transmission chain, driving the three rotating shafts to rotate synchronously. This ensures uniform force distribution during the lifting and lowering of the underground box, preventing tilting. The transmission chain partially meshes with the auxiliary and driven gear discs, reducing meshing wear and extending service life. The first through groove on the positioning shaft and the second through groove on the base provide space for the transmission chain to pass through, preventing interference between the transmission chain and other structures, ensuring smooth transmission, further improving the transmission reliability of the interlocking structure, and facilitating the smooth lifting and lowering of the underground box.

[0013] The invention further comprises: an extension portion extending from one end of the base, the extension portion being positioned away from the positioning shaft, a fixing hole being formed on the extension portion, and a rotating groove being formed circumferentially on the inner peripheral walls at both ends of the fixing hole, a mating gear plate being provided in the rotating groove, a rotating ring being coaxially connected to the mating gear plate, a second base being rotatably connected between the bottom wall of the rotating ring and the bottom wall of the rotating groove, the radial cross section of the shaft hole of the rotating ring being polygonal and forming a locking hole for inserting and engaging the drive shaft, the radial cross section of the locking hole being adapted to the radial cross section of the drive shaft, the drive cavity being connected to the fixing hole, a main gear plate being coaxially connected to the main shaft, and a synchronous chain belt being belt-driven between the main gear plate and two mating gear plates respectively, the links of the synchronous chain belt being respectively engaged with the teeth of the two mating gear plates.

[0014] The advantages of adopting the above technical solution are as follows: By setting an extension part away from the positioning shaft, interference between the drive structure and the positioning shaft, lifting shaft, and other structures is avoided, and the fixing hole provides installation space for the mating gear plate and rotating ring; the above-mentioned rotating groove cooperates with the mating gear plate and rotating ring, and the second base ensures smooth rotation of the rotating ring, and the polygonal locking hole of the rotating ring is adapted to the drive shaft, which can realize quick engagement and disengagement of the drive shaft and the rotating ring, making it convenient for operators to carry and use; the two coaxial mating gear plates realize the positioning of the drive shaft, improving the stability of the drive shaft during rotation; the above-mentioned synchronous chain belt connects the main gear plate and the two mating gear plates, which can realize the synchronous linkage of the drive structure and the interlocking structure, ensuring that the drive shaft drives the main shaft to rotate synchronously when it rotates, thereby driving the three rotating shafts to move synchronously; and the operator can conveniently operate from outside the pit through the drive shaft, further improving the convenience of operation, while improving the transmission stability of the drive structure and the interlocking structure.

[0015] The present invention further comprises: at least one rotating bearing being rotatably connected between the inner peripheral wall of the positioning hole and the outer peripheral wall of the rotating shaft.

[0016] The advantages of adopting the above technical solution are as follows: The addition of at least one rotating bearing between the inner circumferential wall of the positioning hole and the outer circumferential wall of the rotating shaft reduces friction between the rotating shaft and the inner circumferential wall of the positioning hole during rotation, ensuring smooth rotation, reducing rotational resistance, minimizing component wear, and extending the service life of the rotating shaft and positioning shaft. Furthermore, the rotating bearing provides positioning and support for the rotating shaft, preventing deviation and wobbling during rotation, ensuring the coaxiality of the rotating shaft and the lifting shaft, and guaranteeing the reliability of their linkage. This ensures smooth lifting of the underground box, simplifies the rotating structure of the shaft, reduces maintenance costs, and meets the long-term stable operation requirements of underground equipment.

[0017] The present invention further comprises: a tensile rib is provided between two adjacent positioning shafts, and both ends of the tensile rib are provided with through holes for the positioning shaft to pass through; the three tensile ribs are arranged in a triangular distribution and are staggered vertically.

[0018] The advantages of adopting the above technical solution are as follows: In this technology, tensile ribs are set between two adjacent positioning shafts, and the three tensile ribs are distributed in a triangular pattern. This enhances the connection strength and integrity between the three positioning shafts, preventing bending and deformation of the positioning shafts due to uneven stress, and improving the stability of the base. Furthermore, the through holes at both ends of the tensile ribs facilitate connection with the positioning shafts, making assembly convenient. The staggered arrangement of the three tensile ribs avoids mutual interference and disperses the tensile force on the positioning shafts, further improving the tensile strength and preventing the positioning shafts from shifting due to settlement at the bottom of the pit or external forces. This ensures the installation stability of the underground box, extends the overall service life of the equipment, and adapts to complex underground installation environments.

[0019] The present invention further comprises: the tensile reinforcement is composed of a front reinforcement and a rear reinforcement, the two through holes are respectively provided at the beginning of the front reinforcement and the beginning of the rear reinforcement, the end of the front reinforcement is provided with a tensile hole for the end of the rear reinforcement to be inserted, and the inner peripheral wall of the tensile hole is threadedly connected to the end of the rear reinforcement.

[0020] The advantages of adopting the above technical solution are as follows: The tensile reinforcement is designed to consist of a front reinforcement and a rear reinforcement, with perforations at their respective ends, facilitating the assembly and disassembly of the tensile reinforcement and the positioning shaft, and simplifying future maintenance and replacement. Furthermore, the tensile hole at the end of the front reinforcement is threaded to the end of the rear reinforcement, allowing for flexible adjustment of the tensile reinforcement length according to the spacing between the positioning shafts, adapting to different sizes of bases and positioning shaft layouts, and improving the versatility of the tensile reinforcement. The threaded connection structure is robust and reliable, ensuring the tensile strength of the tensile reinforcement, preventing loosening and detachment, further enhancing the connection stability between the positioning shafts, preventing deformation and displacement of the positioning shafts, and ensuring the smooth installation and long-term stable operation of the underground box.

[0021] The present invention further comprises: the three positioning shafts are positioned below the base, and the radial cross-section of the insertion end is tapered.

[0022] The advantages of adopting the above technical solution are as follows: placing the three positioning shafts below the base allows the positioning shafts to be closer to the bottom of the pit, improving the connection stability between the base and the bottom of the pit and preventing the base from shaking or shifting; the radial cross-section of the insertion end is tapered, which reduces the resistance when the positioning shaft is inserted into the ground at the bottom of the pit, making it easier for the positioning shaft to be quickly and accurately inserted into the bottom of the pit. At the same time, the tapered structure can enhance the fit between the positioning shaft and the bottom of the pit, improve the load-bearing capacity and stability of the positioning shaft, prevent the positioning shaft from sinking or shifting during use, thereby ensuring the installation stability of the underground box, simplifying the installation process of the base, and adapting to the ground at the bottom of the pit with different textures. Attached Figure Description

[0023] Figure 1 This is a three-dimensional view of the present invention; Figure 2 This is a three-dimensional view of the base and its linkage structure in this invention; Figure 3 for Figure 2 A sectional view; Figure 4 for Figure 3 A partial 3D view after removing the base; Figure 5 This is a cross-sectional view of the positioning shaft in this invention; Figure 6 This is a cross-sectional view of the tensile reinforcement in this invention. Detailed Implementation

[0024] This invention provides an underground cable branch box, including an underground box 11 and a base 1 for pre-installation in an external foundation pit. The underground box 11 is movably mounted above the base 1. The base 1 has three positioning shafts 2 arranged in a triangular pattern. The ends of the positioning shafts 2 are insertion ends 21 for insertion into the ground at the bottom of the foundation pit. The positioning shafts 2 have positioning holes 22 along their height direction, and the positioning holes 22 connect to the starting end of the positioning shafts 2 to form an outlet. A rotating shaft 3 and a lifting shaft 31 are rotatably mounted in the positioning holes 22. The starting end of the lifting shaft 31 is rotatably connected to the bottom of the underground box 11. The rotating shaft 3 and the lifting shaft 31 are coaxial and linked to drive the lifting shaft 31 synchronously when the rotating shaft 3 rotates. In operation, a cooperating structure is provided between the rotating shaft 3 and the lifting shaft 31 to convert the rotational trend of the lifting shaft 31 into a lifting trend when the rotating shaft 3 rotates. The base 1 is provided with an interlocking structure for driving the three rotating shafts 3 to rotate synchronously and a drive structure for cooperating with the interlocking structure to open and close the interlocking structure. A drive shaft 12 is detachably connected to the base 1 for cooperating with the drive structure to allow external operators to open and close the drive structure outside the external pit. The rotating shaft 3 has a rotating hole 32 along its height direction, and the rotating hole 32 connects to the beginning of the rotating shaft 3 to form a lifting port. The cooperating structure includes a first threaded groove 321 opened on the inner peripheral wall of the rotating hole 32 along the height direction of the rotating shaft 3 and a lifting port opened on the inner peripheral wall of the rotating hole 32 along the height direction of the lifting shaft 31. The second threaded groove 311 on the outer peripheral wall of the lowering shaft 31 is engaged with the first threaded groove 321. A driving cavity 13 is provided at the center of the base 1. The interlocking structure includes a main shaft 4. Both ends of the main shaft 4 are rotatably connected to the inner wall of the driving cavity 13 with a first base 131. The first base 131 is fixed to the inner wall of the driving cavity 13. Three auxiliary gear discs 41 are coaxially connected to the main shaft 4. A driven gear disc 33 is coaxially connected to the beginning of the rotating shaft 3. The three auxiliary gear discs 41 and the three driven gear discs 33 are arranged one-to-one. Each auxiliary gear disc 41 is connected to its corresponding driven gear disc 33 by a transmission chain 411. The links of the transmission chain 411 are respectively connected to the corresponding auxiliary gear disc 411. The teeth of the base 1 and the teeth of the toothed disc 33 are partially meshed. A first through groove 23 is provided on the positioning shaft 2 corresponding to the position of the transmission chain 411 for the links of the transmission chain 411 to pass through. A second through groove 14 is provided on the base 1 corresponding to the position of the transmission chain 411 for the links of the transmission chain 411 to pass through. An extension 15 extends from one end of the base 1, and the extension 15 is positioned away from the positioning shaft 2. A fixing hole 16 is provided on the extension 15. Rotary grooves 161 are circumferentially formed on the inner walls of both ends of the fixing hole 16. A mating toothed disc 5 is provided in the rotary groove 161. A rotating ring 51 is coaxially connected to the mating toothed disc 5. A second base 52 is rotatably connected between the bottom wall of the rotating ring 51 and the bottom wall of the rotary groove 161.The radial cross-section of the rotating ring 51 is polygonal and has a locking hole 53 for inserting and engaging the drive shaft 12. The radial cross-section of the locking hole 53 is adapted to the radial cross-section of the drive shaft 12. The drive cavity 13 is connected to the fixing hole 16. A main gear disk 42 is coaxially connected to the main shaft 4. The main gear disk 42 is connected to two mating gear disks 5 by a synchronous chain belt 43. The links of the synchronous chain belt 43 are respectively engaged with the teeth of the two mating gear disks 5. At least one rotary bearing 24 is rotatably connected between the inner peripheral wall of the positioning hole 22 and the outer peripheral wall of the rotating shaft 3. Tensile ribs 6 are provided between the positioning shafts 2. Each tensile rib 6 has a through hole 61 at both ends for the positioning shaft 2 to pass through. The three tensile ribs 6 are arranged in a triangular pattern and staggered vertically. Each tensile rib 6 consists of a front rib 62 and a rear rib 63. The two through holes 61 are located at the beginning of the front rib 62 and the beginning of the rear rib 63, respectively. A tensile hole 621 for inserting the end of the rear rib 63 is provided at the end of the front rib 62. The inner circumferential wall of the tensile hole 621 is threadedly connected to the end of the rear rib 63. The three positioning shafts 2 are positioned below the base 1, and the radial cross-section of the insertion end 21 is tapered.

[0025] Operating procedure of this device: 1. First, install the shaft and lifting shaft into the positioning holes, ensuring they are coaxial and linked. Use the rotating bearing to ensure smooth rotation of the shaft. Then, rotatably connect the beginning of the lifting shaft to the bottom of the underground box to complete the assembly of the underground box and the base. Insert the tensile ribs through the holes at both ends onto the adjacent positioning shafts. Adjust the threaded connection length of the front and rear ribs so that the three staggered tensile ribs form a triangular support, enhancing the integrity and stability of the positioning shafts. Finally, pre-place the base into the external foundation pit, inserting the conical ends of the three triangularly distributed positioning shafts into the ground at the bottom of the pit to complete the fixed positioning of the base.

[0026] 2. After the equipment is installed, if it is necessary to lift the underground box for easy installation, wiring, or maintenance, the operator does not need to enter the pit. Simply insert the drive shaft outside the pit and rotate it. The drive shaft drives the rotating ring and the mating gear plate to rotate. The mating gear plate drives the main gear plate on the main shaft to rotate via a synchronous chain belt, thus driving the main shaft to rotate synchronously. The three auxiliary gear plates on the main shaft are linked to the driven gear plates on the three rotating shafts via a transmission chain belt, achieving synchronous rotation of the three rotating shafts. The transmission chain belt completes the transmission through the first through groove of the positioning shaft and the second through groove of the base, avoiding interference with other structures. When the rotating shaft rotates, the first threaded groove in its rotating hole meshes with the second threaded groove on the lifting shaft, converting the rotational trend of the rotating shaft into the lifting trend of the lifting shaft. The lifting shaft drives the underground box to rise and fall smoothly. The triangularly distributed positioning shaft and the synchronously operating lifting structure ensure that the underground box is subjected to uniform force and does not tilt, until it is adjusted to the appropriate working height.

[0027] 3. During daily operation and maintenance, the equipment can achieve long-term reliable operation through the stable cooperation between the base and the positioning shaft. The rotating bearing reduces shaft wear and extends the service life of components. The tensile ribs continuously provide tensile support for the positioning shaft and prevent deformation and displacement of the positioning shaft. If the equipment needs to be repaired, components replaced or debugged, repeat the above lifting operation, adjust the underground box to a convenient working height, and after the maintenance is completed, rotate the drive shaft in the opposite direction to lower the underground box to the designated position to ensure that the equipment is concealed.

[0028] The aforementioned underground cable distribution box features a rational overall structural design and strong coordination, effectively solving the technical pain points of existing underground cable distribution boxes, such as inconvenient installation and maintenance, low operational safety, and poor structural stability. It comprehensively improves the practicality, reliability, and ease of operation of the equipment. Specifically, the equipment is pre-installed into the pit via a base, and with the help of three triangularly distributed positioning shafts and a conical insertion end, the base is precisely positioned and stably fixed. The triangular distribution structure effectively distributes the force, preventing the base from shifting or swaying. The addition of tensile ribs further enhances the integrity and tensile strength of the positioning shafts. The staggered triangular distribution design avoids structural interference, allows for flexible length adjustment to adapt to different installation scenarios, prevents deformation of the positioning shafts, and ensures long-term stable installation of the equipment. Through the coaxial linkage of the rotating shaft and the lifting shaft, combined with the threaded meshing structure, rotation can be stably converted into lifting action. The rotating bearing reduces friction and ensures smooth rotation, improving the stability and accuracy of the lifting process and preventing jamming or tilting of the underground caisson. The interlocking structure, through the coordinated action of the main shaft, auxiliary gear plate, driven gear plate, and transmission chain belt, achieves synchronous rotation of the three rotating shafts, ensuring uniform force distribution during lifting and further enhancing lifting reliability. The linkage design of the drive structure and the detachable drive shaft allows operators to complete the lifting operation from outside the pit, eliminating the need to enter the pit and work prone or bent over, significantly reducing labor intensity, avoiding operational safety hazards, and simplifying installation and maintenance procedures. The overall structure described above features convenient assembly and strong disassembly capabilities, facilitating subsequent maintenance and component replacement. The optimized design of each structure not only reduces processing and assembly costs but also extends the service life of the equipment. It is adaptable to different types of foundation pit bottoms and installation scenarios, taking into account both the advantages of concealed installation and the need for convenient operation. It effectively solves the technical problems existing in the current technology, enhances the application effect and promotion value of the buried cable branch box, and can be widely adapted to the power supply needs of various scenarios such as urban power distribution, industrial parks, and high-speed railways.

[0029] To prevent soil from intruding into the drive cavity, fixing holes, and locking holes inside the base during the burial process and to ensure the normal operation of each transmission structure, this equipment employs a multi-layered structural design to effectively mitigate these risks: the base is designed to fit the dimensions of the burial pit, and its outer contour effectively shields the drive cavity at the center, reducing the probability of soil directly contacting the drive cavity during burial. Simultaneously, the main shaft, auxiliary gear disc, transmission chain, and other components assembled inside the drive cavity fit tightly against the inner wall of the cavity, further reducing gaps and preventing soil intrusion. Furthermore, the fixing holes on the extension have minimal assembly gaps with the gear disc, rotating ring, and second base, and each component precisely matches the inner wall of the fixing hole, forming a natural protective barrier to prevent soil from seeping in through the gaps. For the locking holes on the rotating ring, after the drive shaft is disassembled, a sealing plug adapted to the cross-section of the locking hole can be used. As with existing technology, a threaded connection can be used to achieve a sealed connection. Simultaneously, a mating hole with a shape similar to the drive shaft can be formed on the top wall of the sealing plug. The sealing plug is disengaged by the drive shaft engaging with the mating hole and then rotating the drive shaft. The sealing plug fits tightly against the inner wall of the locking hole, completely blocking the passage of soil into the fixing hole and drive cavity through the locking hole. Furthermore, the first through-groove on the positioning shaft and the second through-groove on the base are precisely matched with the links of the transmission chain, with the gap controlled within a reasonable range, effectively reducing soil ingress. At the same time, the tapered insertion end of the positioning shaft fits tightly into the ground at the bottom of the pit, preventing soil from surging up from the gap at the bottom of the positioning shaft. Through these multiple protective designs, it can be ensured that soil will not invade the drive cavity, fixing hole, and locking hole when burying the pit, guaranteeing the long-term stable operation of the equipment.

[0030] To enhance the ease of operation of the drive shaft and reduce operator fatigue, the aforementioned technologies offer two operating modes: manual and external power, adapting to different work scenarios. The drive shaft can be connected to an external motor, providing stable power to drive its rotation without requiring manual force from the operator. This effectively improves the drive shaft's rotation efficiency and significantly reduces operator fatigue, making it particularly suitable for scenarios requiring frequent lifting or long-term operation of underground boxes. Alternatively, the drive shaft can be equipped with a rotating wheel, fixedly connected to it. Operators can rotate the wheel to drive the drive shaft synchronously. The wheel increases the force radius, reducing the force required for manual rotation and facilitating easy rotation. This is suitable for scenarios without external power or small-scale operations. The two operating modes can be flexibly switched, further enhancing the equipment's operational flexibility and practicality, balancing work efficiency and ease of operation.

[0031] The above technology requires the base to be connected to the bottom of the underground box in advance via the lifting shaft. That is, a rotating base is set at the bottom of the underground box and rotatably connected to the lifting shaft. This rotating base is existing technology (such as a bearing seat), so its structure and function will not be described in detail.

[0032] The accompanying drawings in the above instruction manual are only schematic diagrams of the positions and connections of each structure, and do not limit their specific shapes and sizes. The shapes and sizes can be adjusted according to actual installation and production requirements. In the accompanying drawings of the above instruction manual, the synchronous chain and the transmission chain are shown as belts for better illustration of the structure, and are actually chain-belt shaped.

[0033] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A buried cable branch box, comprising a buried box, characterized in that: It also includes a base for pre-installation in an external foundation pit. The buried box is movably mounted on the base. The base has three positioning shafts arranged in a triangular pattern. The ends of the positioning shafts are insertion ends for placement into the bottom of the foundation pit. Each positioning shaft has a positioning hole along its height, which connects to the beginning end of the positioning shaft to form an outlet. A rotating shaft and a lifting shaft are rotatably mounted in the positioning hole. The beginning end of the lifting shaft is rotatably connected to the bottom of the buried box. The rotating shaft and the lifting shaft are coaxial and linked to drive the lifting shaft to rotate synchronously when the rotating shaft rotates. A spacer is provided between the rotating shaft and the lifting shaft for... The base includes a structure that converts the rotational trend of the lifting shaft into a lifting trend when the shaft rotates. It also features an interlocking structure for driving the three shafts to rotate synchronously and a drive structure that engages with the interlocking structure to open and close it. A drive shaft is detachably connected to the base for engaging with the drive structure, allowing external operators to open and close the drive structure from outside the pit. A drive cavity is located at the center of the base. The interlocking structure includes a main shaft, with first bases rotatably connected to the inner walls of the drive cavity at both ends. These first bases are fixed to the inner walls of the drive cavity. Three auxiliary gear discs are coaxially connected to the main shaft. The rotating shaft is coaxially connected to a driven gear disc at its starting end. Three auxiliary gear discs are correspondingly arranged with the three driven gear discs. Each auxiliary gear disc is connected to its corresponding driven gear disc via a transmission chain. The links of the transmission chain partially mesh with the teeth of the corresponding auxiliary gear disc and the teeth of the driven gear disc. A first through-slot is provided on the positioning shaft at the position corresponding to the transmission chain for the links to pass through. A second through-slot is provided on the base at the position corresponding to the transmission chain for the links to pass through. An extension portion extends from one end of the base, positioned away from the positioning shaft. A fixing hole is provided on the extension portion. Both ends of the fixing hole have circumferential grooves on their inner peripheral walls. A mating gear disc is provided in the groove. A rotating ring is coaxially connected to the mating gear disc. A second base is rotatably connected between the bottom wall of the rotating ring and the bottom wall of the groove. The radial cross-section of the rotating ring's shaft hole is polygonal and has a locking hole for inserting and engaging the drive shaft. The radial cross-section of the locking hole is adapted to the radial cross-section of the drive shaft. The drive cavity is connected to the fixing hole. A main gear disc is coaxially connected to the main shaft. A synchronous chain belt is belt-driven between the main gear disc and the two mating gear discs. The links of the synchronous chain belt are respectively engaged with the teeth of the two mating gear discs.

2. The underground cable branch box according to claim 1, characterized in that: The rotating shaft has a rotating hole along its height direction and the rotating hole is connected to the beginning of the rotating shaft to form a lifting port. The mating structure includes a first threaded groove on the inner peripheral wall of the rotating hole along the height direction of the rotating shaft and a second threaded groove on the outer peripheral wall of the lifting shaft along the height direction of the lifting shaft. The first threaded groove and the second threaded groove are engaged.

3. The underground cable branch box according to claim 1, characterized in that: At least one rotating bearing is rotatably connected between the inner peripheral wall of the positioning hole and the outer peripheral wall of the rotating shaft.

4. The underground cable branch box according to claim 1, characterized in that: A tensile rib is provided between two adjacent positioning shafts. Both ends of the tensile rib are provided with through holes for the positioning shaft to pass through. The three tensile ribs are arranged in a triangular distribution and are staggered vertically.

5. A buried cable branch box according to claim 4, characterized in that: The tensile reinforcement consists of a front reinforcement and a rear reinforcement. The two through holes are respectively located at the beginning of the front reinforcement and the beginning of the rear reinforcement. The end of the front reinforcement has a tensile hole for the end of the rear reinforcement to be inserted. The inner circumferential wall of the tensile hole is threadedly connected to the end of the rear reinforcement.

6. The underground cable branch box according to claim 1, characterized in that: The three positioning shafts are positioned below the base, and the radial cross-section of the insertion end is tapered.

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