A rainproof and heat-dissipating distribution box

Abstract

This invention belongs to the field of distribution box technology, specifically disclosing a rainproof and heat-dissipating distribution box, including an outer frame. A first support plate is installed on the surface of the outer frame near the bottom, and a second support plate is installed on the surface of the outer frame near the top. Two air guide shrouds are symmetrically installed between the first and second support plates. The two air guide shrouds cooperate with the electrical components to form a sealed air duct. A pushing mechanism is provided inside the outer frame below the first support plate, and cleaning mechanisms are provided on both sides inside the outer frame above the second support plate. This invention utilizes the air duct, air guide shrouds, and air guide plates to form a circulating airflow, improving heat dissipation efficiency. The air guide shrouds can automatically switch states with the opening and closing of the protective door, facilitating maintenance. The cleaning mechanisms can automatically clean the filter screen, reducing maintenance costs.

Description

Technical Field

[0001] This invention belongs to the field of distribution boxes, and specifically discloses a rainproof and heat-dissipating distribution box. Background Technology

[0002] A distribution box is an electrical device used to distribute and control electrical energy. It is widely used in power systems in industries, commerce, and buildings. Its main functions are to receive power from the upstream power source and distribute the electrical energy to various electrical equipment or branches, while also protecting, monitoring, and controlling the circuit.

[0003] The distribution box contains electrical components such as circuit breakers, contactors, and relays. If rainwater seeps in, it will directly cause the surface of the components to become damp and water to enter. The electrical components inside the distribution box will generate heat when they are working. If the heat cannot be dissipated in time, the temperature inside the box will continue to rise. Rain protection and heat dissipation are crucial for the distribution box. These two functions are directly related to the operational safety, service life, and stable working status of the equipment.

[0004] Existing rainproof and heat-dissipating distribution boxes mostly rely on simple ventilation holes for heat dissipation. The airflow path is disordered, which cannot ensure the uniform distribution of airflow on the surface of electrical components. There are cases of poor local heat dissipation, which can easily lead to the performance degradation or even damage of electrical components due to overheating. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a rainproof and heat-dissipating distribution box to solve the problem that most existing heat dissipation methods rely on simple heat dissipation holes, resulting in disordered airflow paths, failure to ensure uniform airflow distribution on the surface of electrical components, poor local heat dissipation, and easy overheating of electrical components, which can lead to performance degradation or even damage.

[0006] To achieve the above objectives, the present invention provides a rainproof and heat-dissipating power distribution box, including an outer frame. Electrical components are disposed on the inner wall of the outer frame. A first support plate is mounted on the surface of the outer frame near its bottom end, and a second support plate is mounted on the surface of the outer frame near its top end. The electrical components are located between the first and second support plates. A semi-circular opening is formed on the surface of the second support plate. Two air guides are symmetrically installed between the first and second support plates. The air guides are arc-shaped, and the two air guides cooperate with the electrical components to form a sealed air duct. A first heat dissipation device is provided on the surface of the first support plate. The first heat dissipation vent is equipped with a cooling fan located below the sealed air duct, while the semi-circular opening is located above the sealed air duct. Second heat dissipation vents are located on both sides of the top of the inner cavity of the outer frame, with filters fixedly installed inside each vent. A pushing mechanism is located inside the outer frame and below the first support plate, controlling the opening and closing of the two air guides. Cleaning mechanisms are located inside the outer frame and on both sides above the second support plate, cleaning the filters inside the second heat dissipation vents. A protective door is installed at the opening of the outer frame via hinges.

[0007] In the above technical solution, preferably, the inner wall of the flow guide is provided with a flow guide plate, and the flow guide plate is inclined.

[0008] In the above technical solution, preferably, a base is fixedly installed at the bottom of the outer frame, the base is hollow, and the surface of the base is provided with filter holes. A plurality of ventilation holes are evenly provided at the bottom end of the outer frame, and the ventilation holes are connected to the base.

[0009] In the above technical solution, preferably, a connecting cylinder is provided on the end faces of the two guide shields that are far apart from each other. A first light rod is fixedly installed inside the connecting cylinder. The top of the first light rod is rotatably connected to the second support plate. The bottom of the first light rod passes through the first support plate. A gear is provided at the bottom end of the first light rod. Two movable grooves are symmetrically opened at the bottom end of the inner wall of the outer frame. A rack is slidably installed inside the movable groove. The rack meshes with the gear.

[0010] In the above technical solution, preferably, the pushing mechanism includes a movable bar, and two blocks are provided in the middle of the bottom end of the inner cavity of the outer frame. The movable bar is slidably installed between the two blocks. A groove is formed on the surface of the movable bar. Two connecting rods are installed inside the groove through a rotating shaft. The two connecting rods are symmetrical to each other. The other end of the connecting rod is connected to the rack through the rotating shaft. A first spring is connected between the end of the movable bar and the outer frame.

[0011] In the above technical solution, preferably, a drive shaft is rotatably installed on the top of the inner cavity of the outer frame away from the protective door, the surface of the drive shaft is provided with fan blades, the top of the outer frame is provided with a canopy, L-shaped plates are fixedly installed on both sides of the canopy, a stepper motor is installed on the surface of the L-shaped plate, and the output end of the stepper motor is connected to the drive shaft.

[0012] In the above technical solution, preferably, the cleaning mechanism includes a rectangular plate, which is movably engaged inside the second heat dissipation vent, and a scraper is provided on the end face of the rectangular plate close to the filter screen. A second light rod is fixedly installed at the other end of the rectangular plate. A positioning strip is installed on the side wall of the outer frame between the second heat dissipation vent and the drive shaft. The surface of the second light rod movably passes through the positioning strip. A second tension spring is installed on the surface of the second light rod between the rectangular plate and the positioning strip. The two ends of the second tension spring are respectively connected to the rectangular plate and the positioning strip. A cam is fixedly installed at the end of the drive shaft, and the cam corresponds to the second light rod.

[0013] In the above technical solution, preferably, the top of the canopy has a recessed opening, and the recessed opening is generally set in an inclined shape.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Through the synergistic action of the cooling fan, air guide shroud, and air guide plate, a closed heat dissipation circulation channel is formed with bottom inlet and top outlet. The arc-shaped air guide shroud guides the airflow to flow evenly across the surface of the electrical components, and the air guide plate divides the airflow into branches and generates micro turbulence, effectively destroying the boundary layer on the surface of the electrical components, reducing thermal resistance, significantly improving heat dissipation efficiency, ensuring that the electrical components operate stably in a suitable temperature environment, and extending their service life.

[0016] The pushing mechanism is linked with the protective door. When the protective door is closed, it squeezes the movable strip, which drives the guide shroud to close automatically through the linkage, rack and pinion and gear transmission, forming a closed air duct to improve the heat dissipation effect. When the protective door is opened, the spring resets and drives the guide shroud to open, which facilitates the inspection and maintenance of electrical components and is easy to operate.

[0017] In the cleaning mechanism, the cam rotates coaxially with the fan blades. While the fan blades assist in heat dissipation, the cam periodically pushes the second light rod, causing the rectangular plate to drive the scraper to reciprocate, automatically cleaning the filter screen inside the second heat dissipation port. This prevents dust and debris from clogging the filter screen and affecting heat dissipation, ensuring the long-term stable operation of the heat dissipation system and reducing manual maintenance costs.

[0018] The base adopts a hollow structure, and its surface filter holes can intercept dust and debris. At the same time, the special aperture design and structural setting prevent rainwater from seeping in. Even if a small amount of rainwater enters, it can be temporarily stored. The sloping recessed design of the roof can quickly drain rainwater and avoid water accumulation and leakage. The multi-protection structure protects the electrical components inside the distribution box in all aspects, making it suitable for complex environments such as outdoors and improving the reliability and safety of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the outer frame of the present invention;

[0021] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a schematic diagram of the internal structure of the air deflector of the present invention;

[0023] Figure 5 This is a schematic diagram of the cleaning mechanism structure of the present invention;

[0024] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle;

[0025] Figure 7 For the present invention Figure 5 Enlarged view of point C in the middle;

[0026] Figure 8 For the present invention Figure 4 Enlarged view of point D in the middle.

[0027] In the diagram: 1. Outer frame; 2. Protective door; 3. First support plate; 4. Second support plate; 5. Flow guide; 6. Connecting cylinder; 7. Semicircular opening; 8. First heat dissipation vent; 9. Second heat dissipation vent; 10. Pushing mechanism; 11. Cleaning mechanism; 12. Stop block; 13. Movable bar; 14. First spring; 15. Groove; 16. Connecting rod; 17. Movable groove; 18. Rack; 19. First smooth rod; 20. Gear; 21. Rectangular plate; 22. Second smooth rod; 23. Second tension spring; 24. Positioning bar; 25. Drive shaft; 26. Cam; 27. Fan blade; 28. Base; 29. ​​Vent hole; 30. Canopy; 31. L-shaped plate; 32. Flow guide plate. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Numerous 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 therefore the invention is not limited to the specific embodiments disclosed below.

[0030] like Figures 1-8 The diagram shows a rainproof and heat-dissipating electrical distribution box, comprising an outer frame 1. Electrical components are installed on the inner wall of the outer frame 1. A first support plate 3 is installed on the surface of the outer frame 1 near its bottom. A second support plate 4 is installed on the surface of the outer frame 1 near its top. The electrical components are located between the first support plate 3 and the second support plate 4. A semi-circular opening 7 is formed on the surface of the second support plate 4. Two air guides 5 are symmetrically installed between the first support plate 3 and the second support plate 4. The air guides 5 are arc-shaped and cooperate with the electrical components to form a sealed air duct. A first heat dissipation vent 8 is provided on the surface of the first support plate 3. A cooling fan is installed inside the first heat dissipation vent 8, located below the sealed air duct. The semi-circular opening 7 is located above the sealed air duct. Second heat dissipation vents 9 are provided on both sides of the top of the inner cavity of the outer frame 1. Filters are fixedly installed inside the second heat dissipation vents 9. A pushing mechanism 10 is provided below the first support plate 3. The pushing mechanism 10 is used to control the opening and closing of the two air guide shrouds 5. Cleaning mechanisms 11 are provided on both sides inside the outer frame 1 and above the second support plate 4. The cleaning mechanisms 11 are used to clean the filter screen inside the second heat dissipation port 9. A protective door 2 is installed at the opening of the outer frame 1 through a hinge. After the cooling fan is started, it draws in external air through the first heat dissipation port 8. The air flows upward through the sealed air duct formed by the air guide shroud 5 and the electrical components. The arc-shaped air guide shroud 5 guides the airflow to flow evenly over the surface of the electrical components, carrying away the heat generated during operation. The airflow finally passes through the semi-circular opening 7 of the second support plate 4 and is discharged from the second heat dissipation port 9 at the top of the outer frame 1, forming a bottom-in and top-out heat dissipation circulation path. The air guide shroud 5 can automatically switch states with the opening and closing of the protective door 2, which is convenient for maintenance. The cleaning mechanism 11 can automatically clean the filter screen, reducing maintenance costs.

[0031] The inner wall of the air guide shroud 5 is provided with air guide plates 32. The air guide plates 32 are inclined and distributed along the inner wall of the air guide shroud 5. When the cooling fan draws air in from the first heat dissipation port 8, the airflow is forced to change direction after contacting the inclined surface of the air guide plate 32. The inclination angle of the inclined surface divides the mainstream airflow into multiple branches, which evenly cover the surface of the electrical components and avoid local airflow dead zones. When the airflow passes through the inclined air guide plate 32, the surface velocity difference is generated, forming micro turbulence. The turbulence can destroy the boundary layer on the surface of the electrical components, reduce thermal resistance, and make heat transfer to the airflow more efficient, thereby improving heat dissipation efficiency.

[0032] A base platform 28 is fixedly installed at the bottom of the outer frame 1. The base platform 28 is hollow and has filter holes on its surface. Multiple ventilation holes 29 are evenly distributed at the bottom of the outer frame 1 and are connected to the base platform 28. As a hollow structure, the filter holes on the surface of the base platform 28 can intercept dust and debris in the air. Clean air enters the interior of the base platform 28 through the filter holes. The ventilation holes 29 at the bottom of the outer frame 1 are connected to the base platform 28, allowing air to enter the electrical box from the base platform 28 through the ventilation holes 29, forming a complete airflow circulation. The structure of the hollow base platform 28 forms a waterproof channel. When rainwater falls on the surface of the base platform 28, the diameter of the filter holes is usually less than 2mm and is designed to be inclined or multi-layered to prevent rainwater from directly seeping in. Even if a small amount of rainwater enters the base platform 28, the hollow space can temporarily store the rainwater, preventing it from directly entering the outer frame 1 through the ventilation holes 29.

[0033] Two guide shields 5 are provided with connecting cylinders 6 at their far ends. A first guide rod 19 is fixedly installed inside the connecting cylinder 6. The top of the first guide rod 19 is rotatably connected to the second support plate 4. The bottom of the first guide rod 19 passes through the first support plate 3. A gear 20 is provided at the bottom end of the first guide rod 19. Two movable grooves 17 are symmetrically opened at the bottom end of the inner wall of the outer frame 1. A rack 18 is slidably installed inside the movable groove 17. The rack 18 meshes with the gear 20. The rack 18 moves linearly in the movable groove 17. The linear motion of the rack 18 is converted into the rotational motion of the gear 20. The gear 20 drives the first guide rod 19 to rotate synchronously. The top of the first guide rod 19 is rotatably connected to the second support plate 4. The bottom passes through the first support plate 3. When the first guide rod 19 rotates, the guide shields 5 fixed on the connecting cylinder 6 swing about the first guide rod 19 as the axis, realizing the opening and closing action of the two guide shields 5.

[0034] The pushing mechanism 10 includes a movable bar 13. Two stops 12 are provided at the middle of the bottom end of the inner cavity of the outer frame 1. The movable bar 13 is slidably installed between the two stops 12. A groove 15 is formed on the surface of the movable bar 13. Two connecting rods 16 are installed inside the groove 15 through a rotating shaft. The two connecting rods 16 are symmetrical to each other. The other end of the connecting rods 16 is connected to a rack 18 through a rotating shaft. A first spring 14 is connected between the end of the movable bar 13 and the outer frame 1. When the protective door 2 is closed, its inner wall squeezes the movable bar 13, causing the first spring 14 to compress and store elastic potential energy. Under the limiting action of the stops 12, the movable bar 13 moves along the outer frame. The inner cavity of the movable bar 13 slides deeper. The groove 15 on the surface of the movable bar 13 is connected to two symmetrical connecting rods 16 through a rotating shaft. When the movable bar 13 moves, the connecting rod 16 rotates around the rotating shaft in the groove 15 as the fulcrum, pushing the rack 18 to slide along the side wall of the outer frame 1. The rack 18 meshes with the gear 20, driving the gear 20 to rotate, thereby controlling the guide shroud 5 to remain closed. When the protective door 2 opens, the squeezing force acting on the movable bar 13 disappears, the first spring 14 releases its elastic potential energy, pushing the movable bar 13 to return to the outside of the outer frame 1. The connecting rod 16 rotates in the opposite direction, driving the rack 18 to move back, the gear 20 reverses, and the guide shroud 5 opens.

[0035] A drive shaft 25 is rotatably mounted on the top of the inner cavity of the outer frame 1, away from the protective door 2. The surface of the drive shaft 25 is provided with fan blades 27. A canopy 30 is provided on the top of the outer frame 1. L-shaped plates 31 are fixedly mounted on both sides of the canopy 30. A stepper motor is mounted on the surface of the L-shaped plate 31. The output end of the stepper motor is connected to the drive shaft 25. The stepper motor is mounted on the L-shaped plate 31, and its output end is directly connected to the drive shaft 25. When the stepper motor is started, the fan blades 27 on the surface of the drive shaft 25 rotate synchronously with the shaft. The geometric shape of the blades drives the airflow and forms a directional airflow in the inner cavity. This mechanism is used for equipment heat dissipation. The rotating fan blades 27 can push the heat generated by the operation of the components towards the direction of the second heat dissipation port 9 to prevent hot air from accumulating on the top of the outer frame 1.

[0036] The cleaning mechanism 11 includes a rectangular plate 21, which is movably engaged inside the second heat dissipation vent 9. A scraper is provided on the end face of the rectangular plate 21 close to the filter screen. A second guide rod 22 is fixedly installed on the other end of the rectangular plate 21. A positioning strip 24 is installed on the side wall of the outer frame 1 between the second heat dissipation vent 9 and the drive shaft 25. The surface of the second guide rod 22 moves through the positioning strip 24. A second tension spring 23 is installed on the surface of the second guide rod 22 between the rectangular plate 21 and the positioning strip 24. The two ends of the second tension spring 23 are respectively connected to the rectangular plate 21 and the positioning strip 24. A cam 26 is fixedly installed at the end of the drive shaft 25, and the cam 26 corresponds to the second guide rod 22. The drive shaft 25 is driven by... The stepper motor drives the rotation, and the cam 26 at its end rotates synchronously. The outer periphery of the cam 26 has an asymmetrical structure. When the cam 26 rotates, its protruding part periodically pushes the second light rod 22. The second light rod 22 passes through the positioning strip 24 and can only move axially. When the protruding part of the cam 26 contacts the second light rod 22, it pushes the second light rod 22 to move the rectangular plate 21 toward the opening of the outer frame 1. At this time, the second tension spring 23 is stretched and stores elastic potential energy. When the protruding part of the cam 26 moves away from the second light rod 22, the second tension spring 23 contracts and pulls the rectangular plate 21 back to its original position. During this process, the scraper slides along the surface of the filter screen and scrapes off the attached dust, fibers or material debris.

[0037] The top of the canopy 30 has a recessed opening, which is sloping. The sloping opening can quickly drain rainwater, preventing water accumulation in the canopy 30 from increasing the structural load or causing leakage risks. For example, for equipment installed outdoors, it can prevent rainwater from seeping into the interior of the outer frame 1, protecting motors, electrical control components, etc. from moisture damage.

[0038] Working principle: First, the cooling fan is turned on. External air is drawn in through the first heat dissipation port 8 of the first support plate 3, flows upward through the sealed air duct formed by the two guide shrouds 5 and the electrical components. The guide vanes 32 on the inner wall of the guide shrouds 5 divide the airflow into branches, evenly covering the surface of the electrical components, and forming micro-turbulence to break down thermal resistance and improve heat dissipation efficiency. The airflow finally passes through the semi-circular opening 7 of the second support plate 4 and is discharged from the second heat dissipation port 9 at the top of the outer frame 1, completing the bottom-in, top-out heat dissipation cycle. Subsequently, when the protective door 2 is closed, the inner wall squeezes the movable bar 13 of the pushing mechanism 10, compressing the first spring 14. The movable bar 13 slides under the limit of the stop block 12, pushes the rack 18 through the connecting rod 16, drives the gear 20 to rotate, and makes the first guide rod 19 rotate. The two guide shrouds 5 swing and close around the first guide rod 19. When the protective door 2 is opened, the first Spring 14 resets, movable bar 13 moves back, and guide shroud 5 opens accordingly. Then, in the next step, stepper motor drives drive shaft 25 to rotate, fan blade 27 pushes airflow, pushing hot air from the top of outer frame 1 to the second heat dissipation port 9 to assist in heat dissipation. At the same time, cam 26 at the end of drive shaft 25 rotates synchronously, periodically pushing the second light rod 22 of cleaning mechanism 11. Rectangular plate 21 reciprocates under the action of second tension spring 23, driving scraper to clean the filter screen inside the second heat dissipation port 9. Finally, filter holes on the surface of base 28 intercept dust and debris, and clean air enters the distribution box through vent 29. The hollow structure and filter hole design of base 28 prevent rainwater from seeping in. A small amount of rainwater that enters will be temporarily stored. The inclined recessed opening of the roof 30 quickly drains rainwater, avoiding water accumulation and leakage, and providing all-round protection for the electrical components inside the distribution box.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. 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 principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A rainproof and heat-dissipating electrical distribution box, comprising an outer frame (1), characterized in that, Electrical components are provided on the inner wall of the outer frame (1). A first support plate (3) is installed on the surface of the outer frame (1) near the bottom. A second support plate (4) is installed on the surface of the outer frame (1) near the top. The electrical components are located between the first support plate (3) and the second support plate (4). A semi-circular opening (7) is provided on the surface of the second support plate (4). Two air guides (5) are symmetrically installed between the first support plate (3) and the second support plate (4). The air guides (5) are arc-shaped. The two air guides (5) cooperate with the electrical components to form a sealed air duct. A first heat dissipation port (8) is provided on the surface of the first support plate (3). A heat dissipation vent (8) is provided inside the first heat dissipation port (8). A hot air fan is located below a sealed air duct, and a semi-circular opening (7) is located above a sealed air duct. A second heat dissipation port (9) is provided on both sides of the top of the inner cavity of the outer frame (1). A filter screen is fixedly installed inside the second heat dissipation port (9). A pushing mechanism (10) is provided inside the outer frame (1) and below the first support plate (3). The pushing mechanism (10) is used to control the opening and closing of the two air guides (5). A cleaning mechanism (11) is provided on both sides inside the outer frame (1) and above the second support plate (4). The cleaning mechanism (11) is used to clean the filter screen inside the second heat dissipation port (9). A protective door (2) is installed at the opening of the outer frame (1) via a hinge. Two flow guides (5) are provided with connecting cylinders (6) on their far-away end faces. A first light rod (19) is fixedly installed inside the connecting cylinder (6). The top of the first light rod (19) is rotatably connected to the second support plate (4). The bottom of the first light rod (19) passes through the first support plate (3). A gear (20) is provided at the bottom end of the first light rod (19). Two movable grooves (17) are symmetrically opened at the bottom end of the inner wall of the outer frame (1). A rack (18) is slidably installed inside the movable groove (17). The rack (18) meshes with the gear (20). The pushing mechanism (10) includes a movable bar (13). Two blocks (12) are provided at the middle of the bottom end of the inner cavity of the outer frame (1). The movable bar (13) is slidably installed between the two blocks (12). A groove (15) is provided on the surface of the movable bar (13). Two connecting rods (16) are installed inside the groove (15) through a rotating shaft. The two connecting rods (16) are symmetrical to each other. The other end of the connecting rod (16) is connected to the rack (18) through a rotating shaft. A first spring (14) is connected between the end of the movable bar (13) and the outer frame (1).

2. The rainproof and heat-dissipating distribution box according to claim 1, characterized in that, The inner wall of the flow guide (5) is provided with a flow guide plate (32), which is inclined.

3. A rainproof and heat-dissipating distribution box according to claim 1, characterized in that, The bottom of the outer frame (1) is fixedly installed with a base (28). The base (28) is hollow and has filter holes on its surface. The bottom end of the outer frame (1) is evenly provided with multiple air holes (29), which are connected to the base (28).

4. A rainproof and heat-dissipating distribution box according to claim 1, characterized in that, A drive shaft (25) is rotatably mounted on the top of the inner cavity of the outer frame (1) away from the protective door (2). The surface of the drive shaft (25) is provided with fan blades (27). A canopy (30) is provided on the top of the outer frame (1). L-shaped plates (31) are fixedly installed on both sides of the canopy (30). A stepper motor is installed on the surface of the L-shaped plate (31). The output end of the stepper motor is connected to the drive shaft (25).

5. A rainproof and heat-dissipating distribution box according to claim 4, characterized in that, The cleaning mechanism (11) includes a rectangular plate (21), which is movably engaged inside the second heat dissipation port (9). A scraper is provided on the end face of the rectangular plate (21) close to the filter screen. A second light rod (22) is fixedly installed on the other end of the rectangular plate (21). A positioning strip (24) is installed on the side wall of the outer frame (1) between the second heat dissipation port (9) and the drive shaft (25). The surface of the second light rod (22) moves through the positioning strip (24). A second tension spring (23) is installed on the surface of the second light rod (22) between the rectangular plate (21) and the positioning strip (24). The two ends of the second tension spring (23) are respectively connected to the rectangular plate (21) and the positioning strip (24). A cam (26) is fixedly installed at the end of the drive shaft (25). The cam (26) corresponds to the second light rod (22).

6. A rainproof and heat-dissipating distribution box according to claim 4, characterized in that, The top of the canopy (30) has a recessed opening, and the recessed opening is generally inclined.

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