A cable branch box with an impact-resistant fixing seat for cable terminal heads

Abstract

The application belongs to the technical field of power equipment, and particularly relates to a cable branch box with a cable terminal head anti-impact fixing seat, which comprises a protection part, the inside of the protection part is sequentially provided from top to bottom with an arc leading part, a suspension part and a buffer part, the inside of the suspension part is fixedly connected with a cable terminal head, the arc leading part is arranged opposite to the cable terminal head, the arc leading part can attract arc impact when the cable terminal head is separated, and the buffer part is used for absorbing impact received by the suspension part; the buffer part comprises a mounting base, a guide seat, a sliding seat, an elastic reset part, a supporting rod and a supporting seat, and the mounting base is fixedly connected with the lower end of the protection part. Through the special structure design of the arc leading part, the buffer part and the suspension part, the arc precise guidance protection, the impact efficient absorption and unloading, and the terminal head firm and flexible fixation are respectively realized, the modular design of each module is adopted, the equipment protection, the anti-impact capability and the operation and maintenance convenience are improved, and the stable operation of the power distribution line is ensured.

Description

Technical Field

[0001] This invention belongs to the field of power equipment technology, and specifically relates to a cable branch box with an impact-resistant fixing seat for cable termination heads. Background Technology

[0002] Cable distribution boxes, as key equipment in power distribution systems, are widely used in urban power grids, industrial parks, residential communities, and other scenarios for cable line branching, transfer, and distribution. Their operational stability directly affects the power supply reliability of the entire distribution system. In actual operation, cable terminals, as the core components connecting cables within the distribution box, are susceptible to fault separation due to grid voltage fluctuations, line load changes, environmental temperature and humidity, and long-term mechanical stress. This has become one of the main causes of branch box equipment damage and power line faults.

[0003] In existing cable distribution box designs, cable terminations are mostly fixed using rigid connections, which only provide basic positioning and fixation without a specific impact-resistant protection structure. When a cable termination fails and separates, it generates a strong electric arc. Since existing distribution boxes lack dedicated arc guiding and protection components, the arc can easily wander randomly within the box, burning the metal and insulating components around the termination, causing a decrease in insulation performance and even triggering secondary faults such as short circuits and leakage. Furthermore, the fault separation process generates significant mechanical impact. Rigid fixing structures cannot effectively absorb this impact energy, and the impact force is directly transmitted to the distribution box body and internal connecting structures, easily leading to problems such as deformation of the termination fixing seat, loosening of cable connections, and cracking of the box welds. In severe cases, this can cause the entire distribution box to fail, resulting in regional power outages.

[0004] Meanwhile, although some existing cable branch boxes have been equipped with simple protective structures, they suffer from problems such as limited functionality and poor coordination: some only have arc protection components but lack impact absorption structures, making them unable to withstand equipment damage caused by mechanical impacts; some protective structures are fixed designs, and during maintenance of the branch box, the high-voltage protection components lack automatic retraction functions, making it easy for operators to come into contact with the high-voltage arc-ignition components, posing a serious safety hazard. In addition, traditional buffer protection structures often use a single elastic element for direct buffering, which is prone to misalignment and jamming during the buffering process, resulting in low impact energy absorption efficiency and high sliding friction resistance between components, further reducing the response speed and operational reliability of the buffer mechanism, making it difficult to meet the long-term stable operation requirements of cable branch boxes under complex working conditions.

[0005] Furthermore, the existing cable terminal block mounting brackets have poor adaptability, and most are designed with special specifications, which cannot flexibly adapt to different models and specifications of cable terminals. Disassembly and maintenance are cumbersome, increasing the workload and cost of power operation and maintenance. Moreover, the external protective structure of the branch box can only achieve basic dustproof and waterproof functions, and cannot be linked with the internal arc protection and impact buffer structure. The overall protection performance and operational safety of the equipment need to be further improved. Summary of the Invention

[0006] The purpose of this invention is to provide a cable branch box with an impact-resistant fixing seat for cable terminations. Through the exclusive structural design of the arc-guiding part, buffer part, and suspension part, it can achieve precise arc guidance and protection, efficient impact absorption and unloading, and firm and flexible fixing of the termination. The modular design of each module improves the equipment's protection, impact resistance, and ease of operation and maintenance, ensuring the stable operation of the power distribution line.

[0007] The specific technical solution adopted by this invention is as follows: A cable branch box with an anti-impact fixing seat for cable terminals includes a protective part. The interior of the protective part is provided with an arc-inducing part, a suspension part, and a buffer part arranged from top to bottom. A cable terminal is fixedly connected inside the suspension part. The arc-inducing part is arranged opposite to the cable terminal. The arc-inducing part can attract the arc impact when the cable terminal separates. The buffer part is used to absorb the impact received by the suspension part. The buffer section includes a mounting base, a guide seat, a sliding seat, an elastic reset member, a support rod, and a support base. The mounting base is fixedly connected to the lower end of the protective section, and the guide seat is fixedly connected to the upper part of the mounting base. Two sliding seats are slidably arranged inside the guide seat, and the two sliding seats are arranged in parallel. The elastic reset member is arranged between the sliding seats. Multiple support rods are provided. The lower end of the support rod is rotatably connected to the upper end of the sliding seat, and the lower part of the support base is rotatably connected to the upper end of the support rod.

[0008] In a preferred embodiment, the guide seat includes a support block, a guide rod, and a connecting block. The guide rod is slidably connected to the interior of the sliding seat, and the middle part of the guide rod is fixedly connected to the interior of the support block. Two connecting blocks are provided, and the two connecting blocks are respectively fixedly connected to the ends of the guide rod.

[0009] In a preferred embodiment, a limiting cylinder is provided in the middle of the support block, and the interior of the limiting cylinder matches the outer edge dimension of the elastic reset member.

[0010] In a preferred embodiment, the support rods are arranged in pairs, which is accurate. A group of support rods is arranged in a crisscross pattern.

[0011] In a preferred embodiment, the sliding seat is rotatably provided with a rotating wheel, the outer edge of which contacts the outer edge of the guide rod.

[0012] In a preferred embodiment, the protective part includes a support frame, a protective plate, a protective top, and a protective door. The lower end of the support frame is fixedly connected to the upper part of the mounting base. The protective plate is fixedly installed inside the support frame. The protective top is fixedly connected to the upper end of the support frame. The protective door is rotatably disposed inside the support frame, and the inner side of the protective door is in contact with the arc-drawing part.

[0013] In a preferred embodiment, the suspension part includes a suspension frame, a connecting cable, a clamping seat, and a fixing plate. The suspension frame is fixedly connected to the upper end of the support base. Multiple connecting cables are provided. One end of the connecting cable is fixedly connected to the inner side of the suspension frame, and the other end is fixedly connected to the clamping seat. The clamping seat is located inside the suspension frame. The fixing plate is fixed to the upper and lower surfaces of the clamping seat by bolts.

[0014] In a preferred embodiment, the arc-initiating part includes a positioning seat, a connecting seat, a mounting plate, an arc-initiating cone, a bearing wheel, a lifting block, and an elastic extrusion member. The positioning seat is fixedly connected to the upper end of the support frame. The connecting seat is slidably disposed inside the positioning seat. Three mounting plates are provided, two of which are fixedly connected to the upper and lower surfaces of the connecting seat, and the other mounting plate is fixedly connected to the upper end of the positioning seat. Multiple arc-initiating cones are provided inside the mounting plates. The bearing wheel is rotatably connected to one end of the connecting seat. The lifting block is slidably disposed inside the positioning seat, and the upper end of the lifting block contacts the outer edge of the bearing wheel. The elastic extrusion member is disposed between the lifting block and the positioning seat.

[0015] In a preferred embodiment, the upper end of the lifting block is provided with a lifting ramp, the lifting ramp is connected to the outer edge of the bearing wheel, and the height of the lifting ramp is the same as the height of the arc-drawing cone.

[0016] In a preferred embodiment, the end of the arc-inducing cone is tapered, and its surface is provided with an ablation-resistant coating.

[0017] The technical effects achieved by this invention are as follows: This invention employs a tapered arc-starting cone with an ablation-resistant coating, combined with an automatic telescopic structure linked to the protective door, achieving precise arc guidance and efficient protection. The tapered arc-starting cone enhances the electric field strength at its tip, causing the faulty arc to preferentially form at the cone tip and release along a predetermined path, preventing the arc from randomly wandering and burning the insulation and metal components inside the enclosure. The ablation-resistant coating significantly improves the arc-starting cone's resistance to arc erosion, effectively reducing material wear and extending the service life of the arc-starting components. Simultaneously, the linkage design between the protective door and the arc-starting cone enables automatic switching between arc-starting function and maintenance safety. When the protective door is closed, the arc-starting cone automatically extends into a ready-to-work state; when the protective door is opened, the arc-starting cone immediately retracts into its positioning seat. Structurally, this eliminates the safety hazard of operators coming into contact with high-voltage arc-starting components during maintenance, significantly improving the equipment's operational protection capabilities and safety. This invention employs a composite buffer structure consisting of a scissor-type cross support rod in the buffer section, a rolling friction sliding seat, and an elastic reset component with limiting constraints. This structure achieves efficient absorption and smooth unloading of mechanical impacts. The cross support rod efficiently converts the vertical impact displacement caused by cable terminal failures into the horizontal movement of the sliding seat. Combined with the rotating wheel inside the sliding seat, sliding friction is converted into rolling friction, significantly reducing motion resistance and enabling the buffer mechanism to respond quickly to impact loads. The limiting cylinder of the support block provides radial constraint to the elastic reset component, preventing it from skewing or misaligning during compression or extension. This ensures that the elastic reset component transmits force along a predetermined axis, achieving a stable conversion of impact kinetic energy into elastic potential energy. This buffer structure effectively eliminates the impact force of fault impacts on the cable terminal and the internal structure of the branch box, avoiding problems such as deformation of the fixed seat, loose cable connections, and cracking of the box. It significantly improves the equipment's impact resistance under fault conditions, ensuring the continuous and stable operation of the power distribution line. This invention employs a fixing structure combining flexible connection and rigid clamping in the suspension section, along with modular and standardized design of each component, achieving secure fixing of the cable termination, flexible buffering, and convenient equipment maintenance. The bolt clamping structure of the clamping seat and the fixing seat can flexibly adapt to cable terminations of different specifications, significantly improving the versatility of the fixing seat. Multiple connecting cables suspend the clamping seat inside the suspension frame, providing flexible displacement buffering under impact, avoiding stress concentration damage to the cable termination, and ensuring the relative positional accuracy of the arc-starting part and the cable termination, thus guaranteeing the effective operation of the arc-starting function. Furthermore, the protective section, arc-starting part, suspension section, and buffering section are each independently molded with a simple connection method. Each sub-component adopts a standardized design, facilitating disassembly, maintenance, and component replacement. The fully enclosed frame structure of the protective section effectively isolates the equipment from external dust, moisture, and other environmental factors, improving the environmental adaptability of the equipment, reducing the workload and cost of daily operation and maintenance, and balancing the reliability and ease of maintenance of the equipment. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of an embodiment of the present invention; Figure 2 This is an exploded view of the protective section according to an embodiment of the present invention; Figure 3 This is an overall side sectional view of an embodiment of the present invention; Figure 4 This is an exploded view of the buffer section in an embodiment of the present invention; Figure 5 This is a top sectional view of the guide seat according to an embodiment of the present invention; Figure 6 This is a side view of the buffer section according to an embodiment of the present invention; Figure 7 This is an exploded view of the suspension part according to an embodiment of the present invention; Figure 8 This is an exploded view of the arc-drawing section according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the lifting block extending according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the lifting block shrinking according to an embodiment of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Protective Part; 101. Support Frame; 102. Protective Plate; 103. Protective Top; 104. Protective Door; 2. Arc-Inducing Part; 201. Positioning Seat; 202. Connecting Seat; 203. Mounting Plate; 204. Arc-Inducing Cone; 205. Bearing Wheel; 206. Lifting Block; 207. Elastic Extrusion Component; 3. Suspension Part; 301. Suspension Frame; 302. Connecting Cable; 303. Clamping Seat; 304. Fixing Plate; 4. Buffer Part; 401. Mounting Base; 402. Guide Seat; 4021. Support Block; 4022. Guide Rod; 4023. Connecting Block; 403. Sliding Seat; 4031. Rotating Wheel; 404. Elastic Reset Component; 405. Support Rod; 406. Support Seat. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0023] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0024] Please see Figures 1 to 10 As shown, the present invention provides a cable branch box with an anti-impact fixing seat for cable terminations, including a protective part 1. The protective part 1 has an arc-inducing part 2, a suspension part 3 and a buffer part 4 arranged sequentially from top to bottom inside. The cable termination is fixedly connected inside the suspension part 3. The arc-inducing part 2 is arranged opposite to the cable termination. The arc-inducing part 2 can attract the arc impact when the cable termination separates. The buffer part 4 is used to absorb the impact received by the suspension part 3.

[0025] The buffer part 4 includes a mounting base 401, a guide seat 402, a sliding seat 403, an elastic reset member 404, a support rod 405, and a support seat 406. The mounting base 401 is fixedly connected to the lower end of the protective part 1. The guide seat 402 is fixedly connected to the upper part of the mounting base 401. Two sliding seats 403 are slidably arranged inside the guide seat 402, and the two sliding seats 403 are arranged in parallel. The elastic reset member 404 is arranged between the sliding seats 403. Multiple support rods 405 are provided. The lower end of the support rod 405 is rotatably connected to the upper end of the sliding seat 403. The lower part of the support seat 406 is rotatably connected to the upper end of the support rod 405.

[0026] Specifically, when a cable termination fails and separates, it generates an electric arc and mechanical impact. The arc-guiding part 2, positioned above the suspension part 3 and opposite the cable termination, attracts and guides the electric arc, preventing direct burns to the equipment. Simultaneously, the impact force on the suspension part 3 is transmitted to the buffer part 4 below. In the buffer part 4, a support base 406 is fixedly connected to the suspension part 3, and its lower part is rotatably connected to two sliding seats 403 via multiple support rods 405. The sliding seats 403 can slide horizontally within the guide seat 402, and an elastic reset member 404 is provided between them. When an impact force acts on the support base 406, the support rods 405 push the two sliding seats 403 to move in opposite directions, compressing or stretching the elastic reset member 404, converting the impact kinetic energy into elastic potential energy, thereby achieving buffering and energy absorption. The arc-attracting part 2 effectively attracts the electric arc, reducing the risk of damage to the equipment. The sliding-rotating mechanism of the buffer part 4 converts the vertical impact into the horizontal elastic motion, significantly absorbing the mechanical impact on the suspension part 3, protecting the cable terminal head and the internal structure of the branch box, and improving the equipment's impact resistance and operational reliability under fault conditions.

[0027] Please see Figure 4 and Figure 5 As shown, the guide seat 402 includes a support block 4021, a guide rod 4022 and a connecting block 4023. The guide rod 4022 is slidably connected to the interior of the sliding seat 403. The middle part of the guide rod 4022 is fixedly connected to the interior of the support block 4021. Two connecting blocks 4023 are provided, and the two connecting blocks 4023 are respectively fixedly connected to the ends of the guide rod 4022.

[0028] It should be noted that when the impact force is transmitted to the sliding seat 403 via the suspension part 3, the sliding seat 403 slides horizontally along the guide rod 4022. The guide rod 4022 provides precise guidance for the sliding seat 403, ensuring that the two sliding seats 403 maintain parallel relative movement. The support block 4021 in the middle is used to fix and support the guide rod 4022, preventing it from bending or displacing when subjected to repeated loads, while the connecting blocks 4023 at both ends limit the stroke of the sliding seat 403 to prevent it from slipping off.

[0029] The guide seat 402 structure, consisting of support block 4021, guide rod 4022 and connecting block 4023, provides a stable, smooth and controlled sliding track for sliding seat 403, effectively reducing frictional resistance and jamming risk during sliding, and ensuring that buffer part 4 can respond smoothly when subjected to impact; at the same time, the limit design of sliding stroke improves the safety of mechanism operation and enhances the working reliability and service life of the entire buffer mechanism.

[0030] Please see Figure 4 and Figure 5 As shown, a limiting cylinder is provided in the middle of the support block 4021, and the inner size of the limiting cylinder matches the outer edge size of the elastic reset member 404.

[0031] It should be noted that by setting a limiting cylinder in the middle of the support block 4021 and dimensionally fitting the outer edge of the elastic reset member 404, effective radial constraint and axial guidance of the elastic reset member 404 are achieved. This structure can prevent the elastic reset member 404 from bending, misaligning, or deviating during compression or expansion, ensuring that its force is always transmitted along the predetermined axis, so that the two sliding seats 403 are subjected to uniform force and move smoothly. At the same time, the cooperation between the limiting cylinder and the elastic reset member 404 reduces the friction and collision between the elastic reset member 404 and surrounding components, reduces operating noise and wear, and extends the service life of the elastic reset member 404, thereby improving the stability and reliability of the overall energy absorption process of the buffer part 4.

[0032] Please see Figures 2 to 4 As shown, the support rods 405 are arranged in pairs, and the support rods 405 in a pair are arranged in a cross pattern.

[0033] It should be noted that by setting the two support rods 405 in a cross configuration to form a scissor support structure, the vertical displacement can be efficiently converted into horizontal opposing or opposite movements of the two sliding seats 403 when subjected to vertical impact, thereby achieving force direction conversion and dispersion. This cross structure enhances the overall stiffness and stability of the support system, effectively resisting lateral torsion and swaying under impact loads, ensuring the smooth sinking of the suspension part 3; at the same time, the synergistic effect of the cross support rods 405 ensures that the two sliding seats 403 are subjected to balanced forces, resulting in more synchronized and smooth sliding.

[0034] Please see Figure 6 As shown, a rotating wheel 4031 is rotatably provided inside the sliding seat 403, and the outer edge of the rotating wheel 4031 is in contact with the outer edge of the guide rod 4022.

[0035] It should be noted that by rotatably arranging a rotating wheel 4031 inside the sliding seat 403 and making the outer edge of the rotating wheel 4031 contact the outer edge of the guide rod 4022, the sliding friction between the sliding seat 403 and the guide rod 4022 is transformed into rolling friction, significantly reducing the frictional resistance during their relative movement. This structure makes the sliding of the sliding seat 403 on the guide rod 4022 more sensitive, enabling it to quickly respond to impact loads from the suspension part 3 and improving the overall response speed of the buffer part 4. At the same time, the rolling contact reduces wear between the sliding seat 403 and the guide rod 4022, extending their service life and reducing maintenance frequency; the rotating wheel 4031 also helps maintain the smooth movement of the sliding seat 403, avoiding jamming or skew caused by uneven friction, and ensuring that the two sliding seats 403 move synchronously.

[0036] Please see Figure 1 and Figure 2As shown, the protective part 1 includes a support frame 101, a protective plate 102, a protective top 103, and a protective door 104. The lower end of the support frame 101 is fixedly connected to the upper part of the mounting base 401. The protective plate 102 is fixedly installed inside the support frame 101. The protective top 103 is fixedly connected to the upper end of the support frame 101. The protective door 104 is rotatably disposed inside the support frame 101, and the inner side of the protective door 104 is in contact with the arc-drawing part 2.

[0037] Specifically, the support frame 101, protective plate 102, protective top 103, and protective door 104 work together to form comprehensive physical protection for the internal arc-inducing part 2, suspension part 3, and buffer part 4. This effectively isolates the precision mechanism from external environmental factors, improving the equipment's environmental adaptability. The contact design between the inner side of the protective door 104 and the arc-inducing part 2 enables the linkage between the door's opening and closing and the working state of the arc-inducing part 2. This ensures the effective activation of the arc-inducing function during normal operation and automatically releases the limit of the arc-inducing part 2 during maintenance, enhancing operational safety. The overall structure is compact and stable, facilitating installation, inspection, and maintenance.

[0038] Please see Figure 2 , Figure 3 and Figure 7 As shown, the suspension part 3 includes a suspension frame 301, a connecting cable 302, a clamping seat 303, and a fixing plate 304. The suspension frame 301 is fixedly connected to the upper end of the support base 406. Multiple connecting cables 302 are provided. One end of the connecting cable 302 is fixedly connected to the inner side of the suspension frame 301, and the other end is fixedly connected to the clamping seat 303. The clamping seat 303 is located inside the suspension frame 301. The fixing plate 304 is fixed to the upper and lower surfaces of the clamping seat 303 by bolts.

[0039] Specifically, the suspension part 3 is used to install and fix the cable termination. The suspension frame 301, as the main frame, is fixedly connected to the support base 406 below, supporting the suspension part 3 entirely on the buffer part 4. One end of multiple connecting cables 302 is fixedly connected to the inside of the suspension frame 301, and the other end is fixedly connected to the clamping seat 303, thus suspending the clamping seat 303 inside the suspension frame 301. The clamping seat 303 and the fixing plate 304 are bolted together to clamp the cable termination from both above and below, achieving a secure positioning. The flexible connection provided by the connecting cables 302 can provide displacement buffering when subjected to impact, avoiding stress concentration; while the bolted clamping structure can adapt to different specifications of cable terminations, facilitating disassembly and maintenance. When a fault impact occurs, the force is sequentially transmitted through the clamping seat 303, connecting cables 302, and suspension frame 301 to the buffer part 4 for absorption, ensuring the relative positional accuracy between the arc-initiating part 2 and the cable termination, and guaranteeing the effective functioning of the arc-initiating function.

[0040] Please see Figures 8 to 10As shown, the arc-initiating part 2 includes a positioning seat 201, a connecting seat 202, a mounting plate 203, an arc-initiating cone 204, a bearing wheel 205, a lifting block 206, and an elastic extrusion member 207. The positioning seat 201 is fixedly connected to the upper end of the support frame 101. The connecting seat 202 is slidably disposed inside the positioning seat 201. Three mounting plates 203 are provided, two of which are fixedly connected to the upper and lower surfaces of the connecting seat 202, and the other mounting plate 203 is fixedly connected to the upper end of the positioning seat 201. Multiple arc-initiating cones 204 are provided inside the mounting plate 203. The bearing wheel 205 is rotatably connected to one end of the connecting seat 202. The lifting block 206 is slidably disposed inside the positioning seat 201, and the upper end of the lifting block 206 is in contact with the outer edge of the bearing wheel 205. The elastic extrusion member 207 is disposed between the lifting block 206 and the positioning seat 201.

[0041] Specifically, the arc-initiating part 2 is used to guide the arc when the cable terminal head fails and separates, and automatically retracts the arc-initiating cone 204 when the protective door 104 is opened to ensure operational safety. The positioning seat 201 is fixed to the upper end of the suspension frame 301, and the connecting seat 202 is slidably disposed inside the positioning seat 201. Of the three mounting plates 203, two are fixedly connected to the upper and lower surfaces of the connecting seat 202, and the other is fixed to the upper end of the positioning seat 201; multiple arc-initiating cones 204 are disposed inside the mounting plate 203. The bearing wheel 205 is rotatably connected to one end of the connecting seat 202, the lifting block 206 is slidably disposed inside the positioning seat 201 and its upper end is in contact with the outer edge of the bearing wheel 205, and the elastic pressing member 207 is disposed between the lifting block 206 and the positioning seat 201.

[0042] When the protective door 104 is closed, its inner side contacts the lifting block 206 of the arc-starting part 2, so that the bearing wheel 205 is in the lower position and the connecting seat 202 is in the lower position. At this time, the mounting plate 203, which is fixedly connected to the connecting seat 202, drives the arc-starting cone 204 to extend, so that the arc-starting cone 204 is opposite to the cable terminal head and is in the state of waiting to start the arc. When the protective door 104 is opened, the limit of the arc-inducing part 2 is released, the elastic compression member 207 drives the lifting block 206 to slide upward, the upper end of the lifting block 206 presses the bearing wheel 205 to move upward, the bearing wheel 205 drives the connecting seat 202 to slide upward, and the mounting plate 203 fixedly connected to the connecting seat 202 moves upward accordingly, and the arc-inducing cone 204 is put into the positioning seat 201 to avoid the arc-inducing cone 204 being exposed and causing injury.

[0043] It should be noted that the extension and retraction control of the arc-initiating cone 204 and the opening and closing of the protective door 104 are linked through the cooperation of the positioning seat 201, connecting seat 202, mounting plate 203, arc-initiating cone 204, bearing wheel 205, lifting block 206, and elastic pressing component 207. When the protective door 104 is closed, the arc-initiating cone 204 automatically extends to face the cable terminal head, ensuring effective arc guidance and protection of the main equipment in the event of a fault. When the protective door 104 is open, the arc-initiating cone 204 automatically retracts into the positioning seat 201, eliminating the risk of operators contacting high-voltage components and improving the safety of maintenance. This linkage mechanism is compact, reliable, and automatically switches between arc-initiating function and safety protection without additional manual operation, improving the operational safety of the equipment.

[0044] Please see Figures 8 to 10 As shown, the upper end of the lifting block 206 is provided with a lifting ramp, which is connected to the outer edge of the bearing wheel 205, and the height of the lifting ramp is the same as the height of the arc-inducing cone 204.

[0045] Specifically, when the protective door 104 is opened, the elastic compression member 207 pushes the lifting block 206 to slide upward, and the lifting ramp moves upward accordingly, generating relative movement with the outer edge of the bearing wheel 205. Due to the inclination angle of the lifting ramp, the vertical upward movement of the lifting block 206 is converted into a horizontal thrust on the bearing wheel 205, causing the bearing wheel 205 to roll along the ramp and be lifted upward. The upward movement of the bearing wheel 205 drives the connecting seat 202 to slide upward synchronously, and the mounting plate 203, which is fixedly connected to the connecting seat 202, moves upward accordingly, retracting the arc-inducing cone 204 into the positioning seat 201. When the lifting block 206 slides to its limit position, the height of the lifting ramp is the same as the height of the arc-inducing cone 204. At this time, the arc-inducing cone 204 is completely retracted into the positioning seat 201 and is no longer exposed.

[0046] By creating a lifting ramp at the upper end of the lifting block 206 and connecting it to the outer edge of the bearing wheel 205, the vertical sliding motion of the lifting block 206 is smoothly converted into the rolling lifting motion of the bearing wheel 205. This reduces frictional resistance and the risk of jamming during the movement, and improves the response sensitivity and operational reliability of the linkage mechanism. The design that the height of the lifting ramp is the same as the height of the arc-inducing cone 204 enables precise control of the extension and retraction stroke of the arc-inducing cone 204. When the lifting block 206 rises to its limit, the arc-inducing cone 204 is fully retracted into the positioning seat 201. This ensures that the arc-inducing cone 204 does not protrude and injure people when the protective door 104 is open, and also avoids the arc-inducing cone 204 from over-retracting and affecting the positioning accuracy during the next extension. This allows the extension and retraction of the arc-inducing cone 204 to be precisely linked with the opening and closing of the protective door 104, improving the safety of the equipment.

[0047] Please see Figures 8 to 10As shown, the end of the arc-starting cone 204 is tapered, and its surface is provided with an ablation-resistant coating.

[0048] Specifically, the end of the arc-starting cone 204 adopts a tapered design, which can effectively enhance the electric field strength at the end, making it easier for the arc to form preferentially and be stably guided at the tip of the cone. This ensures that the arc is released along a predetermined path and prevents the arc from wandering randomly in other parts of the arc-starting cone 204 and causing burns to the surrounding structure. At the same time, the tapered structure helps the arc energy to be evenly distributed along the cone surface, reducing local overheating.

[0049] By applying an ablation-resistant coating to the surface of the arc-starting cone 204, its resistance to arc erosion is significantly improved. When subjected to multiple arc impacts, the coating effectively slows down material melting, vaporization, and loss, extending the service life of the arc-starting cone 204 and reducing replacement frequency and maintenance costs. The ablation-resistant coating, combined with the tapered end structure, ensures that the arc-starting cone 204 maintains its shape integrity and stable arc-starting performance after multiple arc strikes, guaranteeing the long-term reliable operation of the cable branch box under fault conditions.

[0050] The working principle of this invention is as follows: When a cable termination fails and separates, an electric arc and mechanical impact are generated. The arc-guiding part 2, located above the suspension part 3 and opposite to the cable termination, can attract and guide the electric arc, preventing the arc from directly burning the equipment. Simultaneously, the impact force on the suspension part 3 is transmitted to the buffer part 4 below. In the buffer part 4, the support base 406 is fixedly connected to the suspension part 3, and its lower part is rotatably connected to two sliding seats 403 via multiple support rods 405. The sliding seats 403 can slide horizontally within the guide seat 402, and an elastic reset member 404 is provided between them. When the impact force acts on the support base 406, the support rods 405 push the two sliding seats 403 to move towards or away from each other, compressing or stretching the elastic reset member 404, converting the impact kinetic energy into elastic potential energy, thereby achieving buffering and energy absorption. The arc-attracting part 2 effectively attracts the electric arc, reducing the risk of damage to the equipment. The sliding-rotating mechanism of the buffer part 4 converts the vertical impact into the horizontal elastic motion, significantly absorbing the mechanical impact on the suspension part 3, protecting the cable terminal head and the internal structure of the branch box, and improving the equipment's impact resistance and operational reliability under fault conditions.

[0051] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A cable branch box with an impact-resistant fixing base for cable termination heads, characterized in that: It includes a protective part (1), and inside the protective part (1) are arranged from top to bottom an arc-inducing part (2), a suspension part (3) and a buffer part (4). The suspension part (3) is fixedly connected to a cable terminal head. The arc-inducing part (2) is arranged opposite to the cable terminal head. The arc-inducing part (2) can attract the arc impact when the cable terminal head separates. The buffer part (4) is used to absorb the impact received by the suspension part (3). The buffer part (4) includes a mounting base (401), a guide seat (402), a sliding seat (403), an elastic reset member (404), a support rod (405), and a support seat (406). The mounting base (401) is fixedly connected to the lower end of the protective part (1). The guide seat (402) is fixedly connected to the upper part of the mounting base (401). Two sliding seats (403) are slidably arranged inside the guide seat (402), and the two sliding seats (403) are arranged in parallel. The elastic reset member (404) is arranged between the sliding seats (403). There are multiple support rods (405). The lower end of the support rod (405) is rotatably connected to the upper end of the sliding seat (403). The lower part of the support seat (406) is rotatably connected to the upper end of the support rod (405).

2. A cable branch box with an impact-resistant cable termination fixing base according to claim 1, characterized in that: The guide seat (402) includes a support block (4021), a guide rod (4022), and a connecting block (4023). The guide rod (4022) is slidably connected to the interior of the sliding seat (403). The middle part of the guide rod (4022) is fixedly connected to the interior of the support block (4021). Two connecting blocks (4023) are provided, and the two connecting blocks (4023) are fixedly connected to the ends of the guide rod (4022) respectively.

3. A cable branch box with an impact-resistant cable termination fixing base according to claim 2, characterized in that: The support block (4021) is provided with a limiting cylinder in the middle, and the interior of the limiting cylinder matches the outer edge size of the elastic reset member (404).

4. A cable branch box with an impact-resistant cable termination fixing base according to claim 1, characterized in that: The support rods (405) are arranged in pairs, and the support rods (405) in a pair are arranged crosswise.

5. A cable branch box with an impact-resistant cable termination fixing base according to claim 1, characterized in that: The sliding seat (403) is rotatably provided with a rotating wheel (4031), and the outer edge of the rotating wheel (4031) is in contact with the outer edge of the guide rod (4022).

6. A cable branch box with an impact-resistant cable termination fixing base according to claim 1, characterized in that: The protective part (1) includes a support frame (101), a protective plate (102), a protective top (103), and a protective door (104). The lower end of the support frame (101) is fixedly connected to the upper part of the mounting base (401). The protective plate (102) is fixedly installed inside the support frame (101). The protective top (103) is fixedly connected to the upper end of the support frame (101). The protective door (104) is rotatably disposed inside the support frame (101), and the inner side of the protective door (104) is in contact with the arc-drawing part (2).

7. A cable branch box with an impact-resistant cable termination fixing base according to claim 6, characterized in that: The suspension part (3) includes a suspension frame (301), a connecting cable (302), a clamping seat (303), and a fixing plate (304). The suspension frame (301) is fixedly connected to the upper end of the support base (406). Multiple connecting cables (302) are provided. One end of the connecting cable (302) is fixedly connected to the inner side of the suspension frame (301), and the other end is fixedly connected to the clamping seat (303). The clamping seat (303) is located inside the suspension frame (301). The fixing plate (304) is fixed to the upper and lower surfaces of the clamping seat (303) by bolts.

8. A cable branch box with an impact-resistant cable termination fixing base according to claim 7, characterized in that: The arc-initiating part (2) includes a positioning seat (201), a connecting seat (202), a mounting plate (203), an arc-initiating cone (204), a bearing wheel (205), a lifting block (206), and an elastic extrusion member (207). The positioning seat (201) is fixedly connected to the upper end of the support frame (101). The connecting seat (202) is slidably disposed inside the positioning seat (201). Three mounting plates (203) are provided, with two of the mounting plates (203) fixed to the upper and lower surfaces of the connecting seat (202). The mounting plate (203) is fixedly connected to the upper end of the positioning seat (201). Multiple arc-inducing cones (204) are provided inside the mounting plate (203). The bearing wheel (205) is rotatably connected to one end of the connecting seat (202). The lifting block (206) is slidably disposed inside the positioning seat (201), and the upper end of the lifting block (206) is in contact with the outer edge of the bearing wheel (205). The elastic extrusion member (207) is disposed between the lifting block (206) and the positioning seat (201).

9. A cable branch box with an impact-resistant cable termination fixing base according to claim 8, characterized in that: The upper end of the lifting block (206) is provided with a lifting ramp, which is connected to the outer edge of the bearing wheel (205), and the height of the lifting ramp is the same as the height of the arc-drawing cone (204).

10. A cable branch box with an impact-resistant cable termination fixing base according to claim 8, characterized in that: The end of the arc-inducing cone (204) is conical, and its surface is provided with an ablation-resistant coating.

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