Cable branch box made of graphene modified SMC (Sheet Molding Compound) material

Abstract

The invention relates to the technical field of SMC (Sheet Molding Compound) material cable branch boxes, in particular to a graphene modified SMC material cable branch box which is particularly suitable for the field of power electronic component manufacturing, and comprises a box body, a box cover arranged on one side of the box body in a sleeving manner and handles symmetrically mounted on the outer side of the box cover, and a central partition plate is arranged in the middle of the inner side of the box body in a sleeving manner; the two ends of the center partition plate are provided with double-metal assemblies which deform along with the temperature change so as to achieve adjustment, and the upper ends and the lower ends of the double-metal assemblies are sleeved with ventilation assemblies moving along with the double-metal assemblies. The beneficial effects of the invention are that the ventilation assembly is driven to act by using the deformation characteristic of the bimetallic assembly along with the temperature change, the automatic opening and closing of the ventilation groove and the adaptive adjustment of the ventilation quantity are realized, the temperature of the inner cavity of the box body can be judged by observing the opening and closing degree of the ventilation groove, the ventilation is expanded and the heat dissipation is enhanced at high temperature, and the heat dissipation is reduced at low temperature; the defect that a traditional fixed ventilation structure cannot adapt to temperature changes is overcome.

Description

Technical Field

[0001] This invention relates to the field of SMC material cable branch box technology, specifically a graphene-modified SMC material cable branch box. Background Technology

[0002] Cable distribution boxes, as key equipment in power distribution network systems, are widely used for the connection, transfer, and distribution of power cables. Especially in the field of power electronic component manufacturing, higher requirements are placed on the heat dissipation, insulation, and protection performance of the equipment. Their performance directly affects the reliability and safety of power supply. Traditional cable distribution boxes are mostly made of metal, which has a certain mechanical strength and heat dissipation capacity, but has problems such as heavy weight, poor corrosion resistance, and insufficient insulation performance. In particular, they are prone to corrosion in harsh environments such as humidity, acid rain, and salt spray, which leads to a shortened equipment life and increased maintenance costs. In order to further improve performance, fiber-reinforced composite materials have been gradually promoted in recent years. Among them, sheet molding compound has become an ideal alternative material for cable distribution boxes due to its excellent mechanical properties, corrosion resistance, lightweight, and good insulation properties.

[0003] The aforementioned material is supported by the patent application CN201610954957.9, entitled "A High-Strength SMC Optical Cable Distribution Box," which states that "Sheet Molding Compound (SMC) is a resin-based composite material reinforced with glass fiber, developed in the 1960s. Due to its excellent mechanical properties, superior electrical properties, heat resistance, low shrinkage, and good processing performance, SMC molding compounds have been widely used in various industries, including electrical appliances, instruments, automobile manufacturing, aerospace, transportation, and construction, especially in the electrical appliance industry. In recent years, many domestic and foreign enterprises and research departments have conducted research on the properties of resins and fibers to obtain materials with superior performance. Currently, conventional SMC mainly uses unsaturated polyester resin as the matrix, fillers of other materials, and glass fiber as the main reinforcing raw material, while also incorporating low-shrinkage additives, initiators, thickeners, release agents, and other auxiliary materials."

[0004] However, conventional SMC materials still have limitations in terms of thermal conductivity and thermal stability, which can easily lead to heat accumulation inside the enclosure under long-term high-load operation. This heat is difficult to dissipate effectively, which not only accelerates material aging and affects insulation performance, but may also cause equipment failure or even fire risk. In addition, the heat dissipation structure of existing cable branch boxes mostly relies on fixed ventilation holes or external fans, which cannot achieve adaptive adjustment according to changes in internal temperature. In low-temperature environments, excessive heat dissipation may also cause condensation inside the enclosure, leading to electrical short circuits. Summary of the Invention

[0005] The purpose of this invention is to provide a cable branch box made of graphene-modified SMC material to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The device includes a housing, a cover fitted on one side of the housing, and handles symmetrically installed on the outside of the cover. A central partition is fitted in the middle of the inner side of the housing. Bimetallic components that deform with temperature changes and thus achieve adjustment are provided at both ends of the central partition. Ventilation components that move with the bimetallic components are fitted at both the upper and lower ends of the bimetallic components.

[0007] As a preferred technical solution of this application, the central partition is provided with ventilation holes evenly distributed in the middle, and the two ends of the central partition are symmetrically mounted with mounting shafts, and the central partition is connected to the bimetallic assembly through the mounting shafts at both ends.

[0008] As a preferred technical solution of this application, the bimetallic component includes a first outer metal layer, a second outer metal layer, a third outer metal layer and a fourth outer metal layer that are rectangularly distributed at the upper and lower ends of the mounting shaft. The first outer metal layer and the second outer metal layer are both made of manganese-nickel-copper alloy, and the third outer metal layer and the fourth outer metal layer are both made of nickel-chromium-iron alloy. The thermal bending coefficient of the nickel-chromium-iron alloy is less than that of the manganese-nickel-copper alloy.

[0009] As a preferred technical solution of this application, a first inner metal layer and a second inner metal layer are respectively installed on the inner sides of the first outer metal layer and the second outer metal layer. The first inner metal layer and the second inner metal layer are made of nickel steel alloy. A third inner metal layer and a fourth inner metal layer are respectively installed on the inner sides of the third outer metal layer and the fourth outer metal layer. The third inner metal layer and the fourth inner metal layer are both made of brass.

[0010] As a preferred technical solution of this application, the ventilation component includes baffles spaced apart at the upper and lower ends of the bimetallic component. The bimetallic component is in contact with the ends of the baffles. The baffles are made of thermally conductive material. The inner side of the baffles is bent, and the sidewalls of the baffles are evenly distributed with inwardly extending air guide grooves.

[0011] As a preferred technical solution of this application, a side plate is fixedly installed on the outer side of the baffle, and movable blocks are fixedly and symmetrically installed on the outer side of the side plate that are close to each other. A return spring is fixedly installed on the side of the two sets of movable blocks that are far apart from each other. The return spring is in a stretched state in the initial state.

[0012] As a preferred technical solution of this application, fixed vertical plates are provided on the outer sides of the two sets of side plates. Movable grooves are arrayed in the middle of the fixed vertical plates. The fixed vertical plates are sleeved with movable blocks through the movable grooves. The other end of the reset spring is fixedly connected to the inner side of the fixed vertical plates. Connecting blocks are evenly distributed on the outer side of the fixed vertical plates, and side grooves are evenly opened on the outer side of the connecting blocks. The fixed vertical plates are connected to the inner side of the box body through the connecting blocks. In the initial state, the bottom ends of the two sets of side plates are lower than the bottom ends of the fixed vertical plates and are in contact with the bottom of the inner cavity of the box body. The top ends of the two sets of side plates are higher than the fixed vertical plates and are in contact with the top of the inner cavity of the box body.

[0013] As a preferred technical solution of this application, the upper and lower ends of the central partition are each provided with a socket plate and a connecting vertical plate for connecting the socket plate and the central partition. The socket plate has a through-hole extending to both ends. The socket plate is symmetrically fitted with a first placement plate and a second placement plate through the installation groove. The first placement plate and the second placement plate are symmetrically distributed with arc-shaped spring pieces on their respective sides. The first placement plate and the second placement plate are connected by the arc-shaped spring pieces. The outer sides of the socket plates at both ends are fixedly installed with mounting plates, and the mounting plates are connected to the inner side of the box. The first placement plate and the second placement plate are each provided with a groove on their respective sides. The two sets of grooves are symmetrically distributed. In the initial state, the arc-shaped spring pieces are in a pre-compressed state. When the baffle moves, the inner side of the baffle is inclined and the first placement plate and the second placement plate are in contact with its inner side.

[0014] As a preferred technical solution of this application, the sides of the box are evenly distributed with a frame, the top frame has an air vent that penetrates the side wall of the box, the bottom frame has an extension shaft fitted inside, and the middle of the extension shaft has a one-way groove that penetrates the side wall of the box.

[0015] As a preferred technical solution of this application, a bent plate in the shape of a bend is fixedly installed on the top of the outer side of the side plate, and a movable plate is fixedly installed on the other end of the bent plate, the movable plate being matched with the ventilation slot.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By introducing graphene modification into the SMC matrix, the thermal conductivity of the composite material is greatly improved, giving the enclosure excellent thermal conductivity. It can quickly transfer internal heat to the enclosure surface and dissipate it, effectively avoiding material aging, insulation performance degradation and component damage caused by high temperature, and significantly improving the reliability and lifespan of the equipment under long-term high load operation.

[0017] 2. By utilizing the deformation characteristics of bimetallic components as temperature changes, the ventilation components are driven to move, realizing the automatic opening and closing of the ventilation slots and the adaptive adjustment of ventilation volume. Furthermore, by observing the degree of opening and closing of the ventilation slots, the temperature of the inner cavity of the chamber can be determined. When the temperature is high, ventilation is expanded and heat dissipation is enhanced; when the temperature is low, heat dissipation is reduced and condensation is prevented. This solves the drawback of traditional fixed ventilation structures that cannot adapt to temperature changes.

[0018] 3. Through the linkage of bimetallic components, baffles, side plates, fixed vertical plates and movable plates, a controllable airflow path is formed inside the enclosure, which not only enhances the chimney effect to promote the upward discharge of hot air, but also maintains the internal temperature in low-temperature environments, effectively preventing water vapor condensation and ensuring electrical safety.

[0019] 4. The modular design, with components such as the central partition, socket plate, and placement plate inside the enclosure, facilitates assembly, disassembly, and maintenance. This allows for the integration of multiple functions, including heat dissipation, support, and wiring, within a limited space, reducing future maintenance complexity and costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the internal structure of the housing of the present invention; Figure 3 This is an exploded view of the structure of the housing of the present invention; Figure 4 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 5 This is an exploded view of the connection structure between the side plate and the fixed vertical plate of the present invention; Figure 6 This is a schematic diagram of the connection structure of the baffle of the present invention; Figure 7 This is a schematic diagram of the connection structure on the upper surface of the central partition plate of the present invention; Figure 8 This is an exploded view of the internal connection structure of the socket plate of the present invention; Figure 9 This is a schematic diagram of the structure of the bimetallic component of the present invention.

[0021] The attached diagram lists the components represented by each number as follows: 1. Box body; 2. Box lid; 3. Handle; 4. Frame; 5. Ventilation slot; 6. Central partition; 7. Ventilation vent; 8. Bimetallic component; 801. First outer metal layer; 802. First inner metal layer; 803. Second inner metal layer; 804. Second outer metal layer; 805. Third outer metal layer; 806. Third inner metal layer; 807. Fourth inner metal layer; 808. Fourth outer metal layer; 9. Connecting vertical plate; 10. Sleeve plate; 11. Mounting plate; 12. Mounting groove; 13. First placement plate; 14. Second placement plate; 15. Arc-shaped spring; 16. Baffle; 17. Air guide groove; 18. Side plate; 19. Bending plate; 20. Movable plate; 21. Fixed vertical plate; 22. Connecting block; 23. Side groove; 24. Movable groove; 25. Return spring; 26. Movable block; 27. Mounting shaft; 28. Extension shaft; 29. ​​One-way groove. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention provides a technical solution: such as Figures 1-9 The cable branch box made of graphene-modified SMC material shown includes a box body 1, a box cover 2 sleeved on one side of the box body 1, and handles 3 symmetrically installed on the outside of the box cover 2. A central partition 6 is sleeved in the middle of the inner side of the box body 1. Bimetallic components 8 that deform with temperature changes are provided at both ends of the central partition 6 to achieve adjustment. Ventilation components that move with the bimetallic components 8 are sleeved at both the upper and lower ends of the bimetallic components 8. like Figure 6 and Figure 9 As shown, ventilation holes 7 are evenly distributed in the middle of the central partition plate 6, and mounting shafts 27 are symmetrically installed at both ends of the central partition plate 6. The central partition plate 6 is connected to the bimetallic assembly 8 through the mounting shafts 27 at both ends.

[0024] Furthermore, the bimetallic component 8 includes a first outer metal layer 801, a second outer metal layer 804, a third outer metal layer 805, and a fourth outer metal layer 808 arranged in a rectangular shape at the upper and lower ends of the mounting shaft 27. The first outer metal layer 801 and the second outer metal layer 804 are both made of manganese-nickel-copper alloy, while the third outer metal layer 805 and the fourth outer metal layer 808 are both made of nickel-chromium-iron alloy. The thermal bending coefficient of nickel-chromium-iron alloy is less than that of manganese-nickel-copper alloy. By setting two sets of first outer metal layers 801, second outer metal layers 804, third outer metal layers 805, and fourth outer metal layers 808 made of different materials and making them opposite each other, different deformations can be generated when the temperature changes, resulting in changes in the adjustment amount.

[0025] Furthermore, a first inner metal layer 802 and a second inner metal layer 803 are respectively installed on the inner sides of the first outer metal layer 801 and the second outer metal layer 804. The first inner metal layer 802 and the second inner metal layer 803 are made of nickel-steel alloy. A third inner metal layer 806 and a fourth inner metal layer 807 are respectively installed on the inner sides of the third outer metal layer 805 and the fourth outer metal layer 808. The third inner metal layer 806 and the fourth inner metal layer 807 are both made of brass. The bimetallic component 8, made of different materials, can easily shrink to different degrees according to the temperature, thereby adjusting the vertically distributed baffles 16 to move at different distances.

[0026] like Figure 4 Figure 5 and Figure 6 As shown, the ventilation assembly includes baffles 16 spaced apart at the upper and lower ends of the bimetallic assembly 8. The bimetallic assembly 8 contacts the ends of the baffles 16. The baffles 16 are made of heat-conducting material, and the inner side of the baffles 16 is bent. The sidewalls of the baffles 16 are evenly distributed with inwardly extending air guide grooves 17. The air guide grooves 17 facilitate the conduction of high-temperature gas inside the box 1. The two sets of baffles 16 can form a chimney effect in the inner cavity of the box 1, which, together with the air guide grooves 17, accelerates the movement of hot air to the top inside the box 1. As the internal temperature of the box 1 continues to rise, the bimetallic assembly 8 deforms. At this time, the bimetallic assembly 8 loses its support for the baffles 16, so the baffles 16 can move accordingly.

[0027] Furthermore, a side plate 18 is fixedly installed on the outer side of the baffle 16, and movable blocks 26 are fixedly and symmetrically installed on the outer side of the side plates 18 that are close to each other. A return spring 25 is fixedly installed on the side of the two sets of movable blocks 26 that are far apart from each other. The return spring 25 is in a stretched state in the initial state.

[0028] Furthermore, fixed vertical plates 21 are provided on the outer sides of the two sets of side plates 18. Movable grooves 24 are arrayed in the middle of the fixed vertical plates 21. The fixed vertical plates 21 are sleeved with the movable blocks 26 through the movable grooves 24. The other end of the return spring 25 is fixedly connected to the inner side of the fixed vertical plates 21. Connecting blocks 22 are evenly distributed on the outer side of the fixed vertical plates 21, and side grooves 23 are evenly opened on the outer side of the connecting blocks 22. The fixed vertical plates 21 are connected to the inner side of the box body 1 through the connecting blocks 22. In the initial state, the bottom ends of the two sets of side plates 18 are lower than the bottom ends of the fixed vertical plates 21 and are in contact with the bottom of the inner cavity of the box body 1. The top ends of the two sets of side plates 18 are higher than the fixed vertical plates 21 and are in contact with the top of the inner cavity of the box body 1.

[0029] like Figure 8As shown, the upper and lower ends of the central partition 6 are each provided with a socket plate 10 and a connecting vertical plate 9 for connecting the socket plate 10 and the central partition 6. The socket plate 10 has a through-hole extending to both ends of the socket plate 10. The socket plate 10 is symmetrically fitted with a first placement plate 13 and a second placement plate 14 through the mounting groove 12. The first placement plate 13 and the second placement plate 14 are symmetrically distributed with arc-shaped spring pieces 15 on the side of the first placement plate 13 and the second placement plate 14 that are close to each other. The first placement plate 13 and the second placement plate 14 are connected by the arc-shaped spring pieces 15. The outer side of the socket plate 10 at both ends is fixedly installed with a mounting plate 11, and the mounting plate 11 is connected to the inner side of the housing 1. The first placement plate 13 and the second placement plate 14 each have a groove on their side that is close to each other. The two sets of grooves are symmetrically distributed. In the initial state, the arc-shaped spring piece 15 is in a pre-compressed state. When the baffle 16 moves, since the inner side of the baffle 16 is inclined and the first placement plate 13 and the second placement plate 14 are in contact with its inner side, the baffle 16 moves and the first placement plate 13 and the second placement plate 14 lose their limit. Then, under the action of the arc-shaped spring piece 15, they move, so that the first placement plate 13 and the second placement plate 14 are always in contact with the baffle 16, thereby continuously transferring heat and increasing the heat dissipation effect of the first placement plate 13 and the second placement plate 14.

[0030] like Figure 8 As shown, the sides of the box 1 are evenly distributed with frame 4. The top frame 4 has an air vent 5 that penetrates the side wall of the box 1. The bottom frame 4 has an extension shaft 28 inside it, and the middle of the extension shaft 28 has a one-way groove 29 that penetrates the side wall of the box 1.

[0031] Furthermore, a bent plate 19 is fixedly installed on the top of the outer side of the side plate 18. A movable plate 20 is fixedly installed on the other end of the bent plate 19. The movable plate 20 matches the ventilation slot 5. The bent plate 19 facilitates the movement of the movable plate 20 when the side plate 18 moves with the baffle 16, thereby realizing the opening and closing of the ventilation slot 5.

[0032] Working principle: When in use, first place the device in an appropriate position, and place the electrical components through the first placement plate 13 and the second placement plate 14, so that a gap is reserved between the electrical components and the socket plate 10 for the movement of the first placement plate 13 and the second placement plate 14.

[0033] Temperature rise: As the enclosure 1 operates normally, the electrical components inside its cavity, especially the high-power modules commonly used in the manufacture of power electronic components, as well as cables and other components, continuously heat up, which in turn causes the temperature inside the enclosure 1 to rise continuously. At this time, the heat is continuously conducted through the first placement plate 13, the second placement plate 14 and the baffle 16 connected to them. As the temperature continues to rise, the hot airflow forms a chimney effect under the action of the two sets of symmetrically distributed baffles 16 and the air guide grooves 17 opened on their inner sides, forcing the heat to rise faster and accumulate at the top of the inner cavity of the enclosure 1. The heat absorbed inside the baffle 16 is continuously transferred to the inner side of the enclosure 1 through the side plate 18 installed on its outer side and the fixed vertical plate 21 and connecting block 22, thereby heating the enclosure 1 and making the temperature of the enclosure 1 higher than the temperature of the outer side of the enclosure 1, thereby preventing water vapor from adhering inside the enclosure 1. Deformation: As the internal temperature of the chamber 1 continues to rise, the bimetallic component 8 will bend due to the properties of its material after absorbing heat. Since the materials of the upper and lower bimetallic components 8 are different, the degree of bending when heated is different, with the upper component bending more and the lower component bending less. At the same time, as the bimetallic component 8 bends, the two baffles 16 lose their restraint. Therefore, the upper baffle 16 moves downward under the combined action of its own weight and the return spring 25, and drives the movable plate 20 to move through the bending plate 19 installed on its outer side, thereby opening the ventilation slot 5. At this time, the gas accumulated at the top of the inner cavity of the chamber 1 will pass through the baffle 16 and move to the space between the baffle 16 and the inner wall of the chamber 1. At this time, some of the hot air will be directly discharged from the chamber 1 through the opened ventilation slot 5, and the remaining hot air will spread downward along the side wall of the fixed vertical plate 21, increasing the temperature between the inner wall of the chamber 1 and the fixed vertical plate 21, thereby achieving heat dissipation by expanding the space. In extremely cold weather, this method can also form an insulation zone.

[0034] It should be noted that, at the same time, the lower baffle 16, after being restricted, will move upward under the action of the pre-tightened return spring 25, and then separate from the bottom of the inner cavity of the box 1. At this time, some hot air will flow through the gap at the bottom of the baffle 16 to the space between the fixed vertical plate 21 and the inner side of the box 1. Then, the excess heat can be transported through the extension shaft 28 and the one-way groove 29 set at the bottom of the outer side of the box 1.

[0035] Synchronous adjustment: As the baffle 16 moves, the first placement plate 13 and the second placement plate 14, which are in contact with the inner side of the baffle 16, will be restricted to different degrees by the baffle 16, thereby pushing the first placement plate 13 and the second placement plate 14 to extend or retract. During the movement of the first placement plate 13 and the second placement plate 14, the force will be applied to the arc-shaped spring piece 15 connected to the first placement plate 13 and the second placement plate 14, thereby forcing the arc-shaped spring piece 15 to deform, realizing the adjustment of the position of the first placement plate 13 and the second placement plate 14, and ensuring that the first placement plate 13 and the second placement plate 14 are always in contact with the baffle 16, thereby continuously conducting heat.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] 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 cable branch box made of graphene-modified SMC material, comprising a box body (1), a box cover (2) sleeved on one side of the box body (1), and handles (3) symmetrically installed on the outside of the box cover (2), characterized in that: A central partition (6) is fitted inside the middle of the box (1). Bimetallic components (8) that deform with temperature changes are provided at both ends of the central partition (6). Ventilation components that move with the bimetallic components (8) are fitted at both the upper and lower ends of the bimetallic components (8).

2. A cable branch box made of graphene-modified SMC material according to claim 1, characterized in that: Ventilation holes (7) are evenly provided in the middle of the central partition (6), and mounting shafts (27) are symmetrically installed at both ends of the central partition (6), and the central partition (6) is connected to the bimetallic assembly (8) through the mounting shafts (27) at both ends.

3. A cable branch box made of graphene-modified SMC material according to claim 2, characterized in that: The bimetallic assembly (8) includes a first outer metal layer (801), a second outer metal layer (804), a third outer metal layer (805), and a fourth outer metal layer (808) arranged in a rectangular shape at the upper and lower ends of the mounting shaft (27). The first outer metal layer (801) and the second outer metal layer (804) are both made of manganese-nickel-copper alloy, and the third outer metal layer (805) and the fourth outer metal layer (808) are both made of nickel-chromium-iron alloy.

4. A cable branch box made of graphene-modified SMC material according to claim 3, characterized in that: The inner sides of the first outer metal layer (801) and the second outer metal layer (804) are respectively equipped with a first inner metal layer (802) and a second inner metal layer (803). The first inner metal layer (802) and the second inner metal layer (803) are made of nickel steel alloy. The inner sides of the third outer metal layer (805) and the fourth outer metal layer (808) are respectively equipped with a third inner metal layer (806) and a fourth inner metal layer (807). The third inner metal layer (806) and the fourth inner metal layer (807) are both made of brass.

5. A cable branch box made of graphene-modified SMC material according to claim 1, characterized in that: The ventilation assembly includes baffles (16) spaced at the upper and lower ends of the bimetallic assembly (8). The inner side of the baffles (16) is bent, and the sidewalls of the baffles (16) are evenly distributed with inwardly extending air guide grooves (17).

6. A cable branch box made of graphene-modified SMC material according to claim 5, characterized in that: A side plate (18) is fixedly installed on the outer side of the baffle (16), and movable blocks (26) are fixedly and symmetrically installed on the outer side of the side plates (18) that are close to each other, and a return spring (25) is fixedly installed on the side of the two sets of movable blocks (26) that are far apart from each other.

7. A cable branch box made of graphene-modified SMC material according to claim 6, characterized in that: Two sets of side plates (18) are provided with fixed vertical plates (21) on their outer sides. The fixed vertical plates (21) have movable slots (24) arranged in the middle. The fixed vertical plates (21) are connected to the movable blocks (26) through the movable slots (24). The other end of the reset spring (25) is fixedly connected to the inner side of the fixed vertical plates (21). Connecting blocks (22) are evenly distributed on the outer side of the fixed vertical plates (21), and side slots (23) are evenly opened on the outer side of the connecting blocks (22). The fixed vertical plates (21) are connected to the inner side of the box body (1) through the connecting blocks (22).

8. A cable branch box made of graphene-modified SMC material according to claim 1, characterized in that: The upper and lower ends of the central partition (6) are each provided with a socket plate (10) and a connecting vertical plate (9) for connecting the socket plate (10) and the central partition (6). The socket plate (10) has a through-hole extending to both ends of the socket plate (12). The socket plate (10) is symmetrically fitted with a first placement plate (13) and a second placement plate (14) through the installation groove (12). The first placement plate (13) and the second placement plate (14) are symmetrically distributed with arc-shaped spring pieces (15) on the side of the first placement plate (13) and the second placement plate (14) that are close to each other. The first placement plate (13) and the second placement plate (14) are connected by the arc-shaped spring pieces (15). The outer side of the socket plate (10) at both ends is fixedly installed with an installation plate (11), and the installation plate (11) is connected to the inner side of the box (1).

9. A cable branch box made of graphene-modified SMC material according to claim 1, characterized in that: The box (1) has a frame (4) evenly distributed on both sides. The top frame (4) has a ventilation groove (5) that penetrates the side wall of the box (1). The bottom frame (4) has an extension shaft (28) inside, and the middle of the extension shaft (28) has a one-way groove (29) that penetrates the side wall of the box (1).

10. A cable branch box made of graphene-modified SMC material according to claim 7, characterized in that: A bent plate (19) is fixedly installed on the top of the outer side of the side plate (18), and a movable plate (20) is fixedly installed on the other end of the bent plate (19). The movable plate (20) matches the ventilation slot (5).

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