A low-cost junction box with plastic embedded in metal

Abstract

This invention discloses a low-cost junction box with plastic embedded in metal, specifically relating to the field of junction box technology. It includes a junction box body with a grounding aluminum base embedded in one side. A wire harness assembly is also included, located on one side of the junction box body, for concentrating and harnessing the wires entering the junction box body. The wire harness assembly includes a fixing ring on one side of the junction box body. A rotating external gear ring drives a gear and rack in precise linkage, causing multiple wire harness blocks to move synchronously radially along the fixing ring. Counterclockwise rotation expands the space between the wire harness blocks, facilitating easy wire passage, while clockwise rotation causes the wire harness blocks to converge synchronously, automatically centering and clamping the wires. This eliminates the need to tighten individual screws with a screwdriver; a single rotation completes the entire wire harnessing process, significantly improving wiring efficiency.

Description

Technical Field

[0001] This invention relates to the field of junction box technology, and more specifically to a low-cost junction box with plastic embedded in metal. Background Technology

[0002] In fields such as photovoltaic power generation, building electrical systems, and industrial control, junction boxes are key components for cable connection and branch protection. Their performance and cost directly affect the reliability and economy of the entire system. Junction boxes are one of the electrical accessories. The wires used in decoration run through conduits, and at the joints of the wires, such as when the line is long or the conduit needs to turn a corner, junction boxes are used as transitions. The conduit and the junction box are connected, and the wires inside the conduit are connected in the junction box, which plays the role of protecting and connecting the wires. This is what a junction box is.

[0003] Currently, the most common junction boxes on the market are mainly divided into two categories: all-metal junction boxes and all-plastic junction boxes. However, both types of products have significant technical defects and cost bottlenecks in practical applications. When multiple wires need to be connected to the same junction box at the same time, such as busbars or multi-branch connections, operators need to insert each wire into its own terminal hole and then tighten the wire screws one by one. During this process, the ends of the wires are prone to bend or shift, resulting in some wires not being effectively clamped or having poor contact. What's more troublesome is that when the internal space of the junction box is small and there are many wires, it is difficult for operators to reach into the box with their hands and screwdrivers for precise operation. They may even need to use bent screwdrivers or special tools, which seriously reduces wiring efficiency. Although some high-end junction boxes use cage spring terminals or spring-loaded terminals instead of screws, the clamping force of the spring on the wires depends on the precise insertion depth and angle. During on-site construction, improper operation often leads to loose connections. Moreover, spring-loaded terminals cannot simultaneously center and tighten multiple wires, and there are still problems of uneven distribution and inconsistent force. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a low-cost junction box with plastic embedded in metal, thereby solving the problems mentioned in the background section.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A low-cost plastic-embedded metal junction box includes a junction box body, a grounding aluminum base on one side of the junction box body, the grounding aluminum base being embedded inside the junction box body; and a wire harness assembly, disposed on one side of the junction box body, for concentrating and harnessing the wires entering the junction box body, the wire harness assembly including: a fixing ring disposed on one side of the junction box body, a plurality of wire harness blocks disposed on one side of the fixing ring, a rack fixedly mounted on the side of the wire harness blocks near the fixing ring, a T-slot formed on one side of the rack, a plurality of sliding rods fixedly mounted on the side of the fixing ring near the wire harness blocks, the sliding rods being slidably connected to the T-slot, an external gear ring disposed on the side of the fixing ring near the wire harness blocks, and a plurality of mounting shafts fixedly mounted on one side of the fixing ring, the outer diameter of the mounting shafts being... A first gear is movably sleeved on the wall surface, and the first gear meshes with the external gear ring. A second gear is movably sleeved on the outer circular wall surface of the mounting shaft. The first gear and the second gear are fixedly installed, and the second gear meshes with the rack. Two arc-shaped holes are opened on one side of the fixed ring. An operating table and a pulley table are fixedly installed on one side of the external gear ring. The operating table and the pulley table are slidably connected to the two arc-shaped holes respectively. The junction box body is made of plastic, and the grounding aluminum base is made of aluminum. One end of the operating table is provided with a limiting component for locking the external gear ring after rotation. One side of the junction box body is provided with a connecting component for quick assembly and disassembly of the fixed ring and the wire harness block. One side of the inside of the junction box body is provided with a protective component for cutting off the wires connected to the inside of the junction box body.

[0006] By adopting the above technical solution, the junction box body is made entirely of plastic, while the grounding aluminum base is made of aluminum. Using the grounding aluminum base as the overall grounding point allows for a seamless connection between the junction box body and the grounding aluminum base, avoiding the use of all-aluminum or all-plastic junction box bodies. When wiring the inside of the junction box body, the external wire is passed through the wiring in the junction box body and then into its interior. Subsequently, by rotating the operating table, it slides along the inside of the arc-shaped hole, thereby driving the external gear ring and the pulley table to rotate. The pulley table rotates inside the second arc-shaped hole. When the external gear ring rotates, it meshes and drives the first gear to rotate. The first gear drives the second gear to rotate, and then the second gear meshes and drives the rack to move linearly. At this time, several racks move simultaneously and drive the wire harness blocks installed with the racks to move synchronously. By rotating the outer gear ring counterclockwise, multiple wire harness blocks can move and spread outwards from the center of the fixed ring, thereby expanding the space between multiple wire harness blocks. When the external wire passes through the wiring port of the junction box body into the interior of the junction box body, the wire will pass between several wire harness blocks and through the fixed ring to reach the interior of the junction box body. After the wiring is completed, by rotating the outer gear ring clockwise to mesh and drive the first gear and the second gear to rotate, several wire harness blocks move simultaneously and move closer to each other. Then, multiple wire harness blocks will approach the wire, thereby securing the wire to the inside of the junction box body.

[0007] Preferably, the limiting component includes: a pressing groove, which is formed at one end of the operating table; a compression groove is formed on one side of the operating table; a first spring is fixedly installed on the bottom surface of the compression groove; a pressure block is movably sleeved inside the pressing groove; the pressure block is movably sleeved with the compression groove; the pressure block is fixedly installed with the first spring; a spring-loaded groove is formed on the outer circular wall of the operating table; the spring-loaded groove is connected to the pressing groove; a snap-fit ​​bracket is fixedly installed on one side of the pressure block; the snap-fit ​​bracket is slidably connected with the spring-loaded groove; a first semi-circular frame is fixedly installed on one side of the fixing ring; a plurality of snap-fit ​​slots are formed on one side of the inner surface of the first semi-circular frame; the snap-fit ​​bracket is movably snap-fitted with the snap-fit ​​slots.

[0008] By adopting the above technical solution, and through the set snap-fit ​​bracket, when the operator rotates the outer gear ring, firstly by pressing the pressure block and compressing the first spring, the pressure block drives the snap-fit ​​bracket to move downwards, allowing the snap-fit ​​bracket to move from inside the slot. Subsequently, the pressure block is pushed to drive the operating table and the outer gear ring to rotate. After the outer gear ring rotates, by releasing the pressure block, the first spring will drive the pressure block and the snap-fit ​​bracket to spring back to their original positions. The snap-fit ​​bracket will then enter the slot, thereby restricting the rotated outer gear ring and also restricting the wire harness block to prevent the wire harness block from moving.

[0009] Preferably, a second semi-circular frame is fixedly installed on one side of the fixed ring, an iron plate is fixedly installed on one side of the second semi-circular frame, a plurality of movable wheels are fixedly installed on the inner side of the iron plate, and a magnet is fixedly installed on the outer circular wall of the pulley table.

[0010] By adopting the above technical solution, when the external gear ring drives the pulley table to move, the pulley table will drive the magnet to move along the surface of the second semi-circular frame. During the movement of the pulley table, the magnet and the iron sheet attract each other, thus generating resistance during the movement, which can apply resistance to the rotating external gear ring. In addition, the pulley table will move along the movable wheel during the movement. Through the rotation of the movable wheel, frictional damage during the movement of the pulley table can be reduced.

[0011] Preferably, the connecting assembly includes: a plurality of docking posts, each of which is fixedly installed on one side of the junction box body; a docking groove is formed on one side of each docking post; a spiral groove is formed inside each docking post; the docking groove communicates with the spiral groove; a recess is formed inside the spiral groove; a plurality of connecting rods are fixedly installed at one end of the fixing ring; a movable groove is formed at one end of each connecting rod; a bearing is fixedly sleeved inside the movable groove; a rotating cover is movably sleeved inside the movable groove; the rotating cover is fixedly sleeved with the inner circular wall of the bearing inner ring; a movable post is fixedly installed on the outer circular wall of the rotating cover; a rotating wheel is movably sleeved on the outer circular wall of the movable post; the connecting rods and the rotating cover are movably sleeved with the docking posts; the movable post is movably engaged with the recess; and the rotating wheel is slidably connected with the spiral groove.

[0012] By adopting the above technical solution, before wiring inside the junction box body, the fixed ring is pulled to move the connecting rod and the rotating cover inside the docking post, thereby disassembling the junction box body from the outside. After the wiring inside the junction box body is completed, the wires pass through the fixed ring and are bundled through multiple wire harnesses. The fixed ring is then moved to move the connecting rod and the rotating cover, bringing the rotating cover close to the docking post. The moving post and rotating wheel are then placed inside the docking groove, passing through the docking groove to reach the spiral groove. The fixed ring is then pushed to press the connecting rod and the rotating cover into the docking post. The moving post and rotating wheel move along the spiral groove, causing the rotating cover to rotate. When the moving post reaches the groove, it restricts the rotating cover and the connecting rod, making it easier to install the fixed ring at the wiring port of the junction box body.

[0013] Preferably, the outer surface of the wire harness block is provided with a shrinkage groove, and a guide rod is movably sleeved inside the shrinkage groove. Several friction blocks are arranged between several wire harness blocks. The guide rod is fixedly installed with the friction blocks. A second spring is movably sleeved on the outer circular wall surface of the guide rod. The two ends of the second spring are fixedly installed with the wire harness block and the friction block, respectively.

[0014] By adopting the above technical solution, when several wire-bundling blocks bundle the wires, the wire-bundling blocks will cause the friction blocks to first contact the wires. As the several wire-bundling blocks gradually approach each other, the friction blocks encounter the resistance of the wires, and the wire-bundling blocks will compress the second spring to move. Then the guide rod will retract into the shrinkage groove, so that the several friction blocks can clamp the wires.

[0015] Preferably, a plurality of fixing rods are fixedly installed on one side of the inside of the junction box body. The outer circular wall of the fixing rod is provided with a sliding groove. The outer circular wall of the fixing rod is provided with two rotating grooves. The rotating grooves are connected to the sliding grooves. A rotating tube is movably sleeved on the outer circular wall of the fixing rod. A plurality of linear guides are fixedly installed on the outer circular wall of the rotating tube. Two moving blocks are fixedly installed on the inner circular wall of the rotating tube. The moving blocks are slidably connected to the sliding grooves and the rotating grooves, respectively.

[0016] By adopting the above technical solution, and through the setting of the wire management lines, when there are many wires inside the junction box, firstly, the rotating tube is inserted into the outside of the fixed rod, and then the moving block is allowed to slide inside the slide groove. At this time, the connection between the slide groove and the moving block can restrict the rotating tube to the outside of the fixed rod. Then, by placing the wires into the inside of multiple wire management lines, the wires are hooked, and then the wire management lines are pushed to move the moving block, so that the moving block enters the inside of the rotating groove. At this time, the moving block can rotate inside the rotating groove, and then the downward weight of the wire management lines will drive the rotating tube to rotate downward, so that the wire management lines can press on the surface of the wires, which facilitates the wire management inside the junction box.

[0017] Preferably, the protection component includes: a mounting ring, which is fixedly installed on one side inside the junction box body. The outer circular wall of the mounting ring has two scissor holes. A fixing post is fixedly installed inside the scissor holes. A torsion spring is movably sleeved on the outer circular wall of the fixing post. A rotating sleeve is movably sleeved on the outer circular wall of the fixing post. A ring blade is fixedly installed on the outer circular wall of the rotating sleeve.

[0018] By adopting the above technical solution, and using the set ring blades, when the inside of the junction box or the external wires catch fire, the two staggered and symmetrical ring blades, which approach and cross each other, can cut the wires entering the junction box.

[0019] Preferably, the outer circular wall of the rotating sleeve is provided with a locking groove, and the two sides of the mounting ring are respectively provided with snap-fit ​​grooves. A stabilizing block is movably snapped into the snap-fit ​​groove, and a locking block is provided between two stabilizing blocks. Several fusible plastic tubes are fixedly installed inside the locking block. The fusible plastic tubes are fixedly installed with the stabilizing block. The locking block and the stabilizing block are spaced apart. Ignition cotton is fixedly installed inside the scissor hole.

[0020] By adopting the above technical solution, the ring blades are initially positioned inside the scissor holes via the fusible plastic tube. First, the rotating sleeve compresses the torsion spring, separating the two ring blades and concealing them inside the scissor holes. When exposed to an open flame, the fire first ignites the igniting cotton, which then spreads upwards to the locking block. The ignition of the igniting cotton melts the fusible plastic tube. Due to the gap between the two stabilizing blocks and the locking block, the resistance of the torsion spring disappears after the fusible plastic tube melts. The torsion spring then causes the rotating sleeve, locking block, and ring blades to rebound instantly, allowing the two ring blades to cross and cut the wire.

[0021] In summary, the present invention has the following main beneficial effects: 1. This invention achieves low-cost, high-efficiency, and high-reliability wiring and cable management functions through the junction box body and the grounding aluminum base. The aluminum grounding base is embedded within the plastic junction box body, maintaining the insulation, lightweight, and low-cost injection molding advantages of plastic. Simultaneously, the excellent conductivity of the aluminum base provides a reliable grounding path, avoiding the drawbacks of all-metal junction boxes (high cost, heavy weight, and the need for additional insulation) and overcoming the safety shortcoming of all-plastic junction boxes (ineffective grounding). During wiring operations, the rotation of the external gear ring drives the precise linkage between the gear and rack, causing multiple cable management blocks to move synchronously radially along the fixed ring. Counterclockwise rotation expands the space between the cable management blocks, facilitating easy wire passage, while clockwise rotation moves the cable management blocks synchronously. The wires are automatically aligned and clamped together, eliminating the need to tighten each wire clamping screw individually with a screwdriver. A single rotation completes the entire wire-bundling process, significantly improving wiring efficiency. Each wire-bundling block has an elastic friction block at its front end. As the block moves inward, the friction block first contacts the wire surface. As clamping force continues to be applied, the friction block pushes the guide rod back into the contraction groove and compresses the second spring. The elastic reaction force of the spring keeps the friction block in contact with the wire sheath. This structure can adaptively clamp wires of different diameters, buffering the stress concentration that may occur with rigid clamping. This effectively prevents the wire insulation from being damaged or the wire from being broken, while ensuring sufficient contact pressure to prevent the wire from loosening. Thus, it improves wiring efficiency while ensuring long-term reliability.

[0022] 2. This invention utilizes a combination of pressure block, snap-fit ​​bracket, snap-fit ​​slot, magnet, iron sheet, and movable wheel. The press-release snap-fit ​​bracket engages with the snap-fit ​​slot, locking the outer gear ring to prevent the cable from loosening. The magnet and iron sheet provide uniform rotational damping, which, combined with the rolling support of the movable wheel, improves the operating feel and extends the service life.

[0023] 3. The present invention utilizes the interaction of a rotating cover, a movable column, a spiral groove, and a recess. The rotating cover is pushed into the spiral groove by the movable column and locked into the recess, achieving tool-free quick disassembly and self-locking sealing, thus simplifying maintenance operations.

[0024] 4. This invention uses the combination of wire organizer, rotating tube and rotating groove. The wire organizer relies on its own weight to press down the wire and can swing outward along the rotating groove, which makes it convenient to pick up and put down the cable, keep the wire harness in the box neat and orderly, and facilitate future maintenance.

[0025] 5. This invention utilizes a combination of a ring blade, a torsion spring, a fusible plastic tube, and ignition cotton. The ignition cotton ignites upon contact with an open flame, and the fusible plastic tube rapidly melts, releasing the energy stored in the torsion spring. This drives the ring blade to instantly cut the wires in a cross pattern, physically preventing the fire from spreading along the cable and providing a backup safety barrier for the junction box that is independent of electronic protection. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the junction box body structure of the present invention; Figure 3 This is a schematic diagram of the fixing rod structure of the present invention; Figure 4 This is a schematic diagram of the rotating tube structure of the present invention; Figure 5 This is a schematic diagram of the mounting ring structure of the present invention; Figure 6 This is a schematic diagram of the ignition cotton structure of the present invention; Figure 7 This is a schematic diagram of the locking block structure of the present invention; Figure 8 This is a schematic diagram of the scissor hole structure of the present invention; Figure 9 yes Figure 8 A magnified schematic diagram of a portion of the structure of A in the diagram; Figure 10 This is a schematic diagram of the grounding aluminum base structure of the present invention; Figure 11 This is a schematic diagram of the docking column structure of the present invention; Figure 12 yes Figure 11 Schematic diagram of the cross-sectional structure at point BB; Figure 13 This is a schematic diagram of the fixing ring structure of the present invention; Figure 14 This is a schematic diagram of the connecting rod structure of the present invention; Figure 15 This is a schematic diagram of the wire harness block structure of the present invention; Figure 16 This is a schematic diagram of the external gear ring structure of the present invention; Figure 17 This is a schematic diagram of the pulley table structure of the present invention; Figure 18 yes Figure 17 A magnified schematic diagram of a local structure of C; Figure 19 This is a schematic diagram of the second semi-circular frame structure of the present invention; Figure 20 yes Figure 19 A magnified schematic diagram of a local structure of D.

[0027] Reference numerals: 1. Junction box body; 2. Grounding aluminum base; 3. Fixing ring; 4. Cable bundle block; 5. Rack; 6. T-slot; 7. Sliding rod; 8. External gear ring; 9. Mounting shaft; 10. First gear; 11. Second gear; 12. Arc-shaped hole; 13. Operating table; 14. Pulley table; 15. Pressing groove; 16. Compression groove; 17. First spring; 18. Pressure block; 19. Rebound groove; 20. Snap-fit ​​bracket; 21. First semi-circular bracket; 22. Snap-fit ​​groove; 23. Second semi-circular bracket; 24. Iron sheet; 25. Magnet; 26. Movable wheel; 27. Connecting post; 28. Connecting groove; 29. ​​Screw 30. Groove; 31. Connecting rod; 32. Movable groove; 33. Bearing; 34. Rotating cover; 35. Moving column; 36. Rotating wheel; 37. Shrinkage groove; 38. Guide rod; 39. Friction block; 40. Second spring; 41. Fixed rod; 42. Sliding groove; 43. Rotating groove; 44. Rotating tube; 45. Straightening line; 46. Moving block; 47. Mounting ring; 48. Scissor hole; 49. Fixed column; 50. Torsion spring; 51. Rotating sleeve; 52. Ring knife; 53. Locking groove; 54. Snap-fit ​​groove; 55. Locking block; 56. Stabilizing block; 57. Fusible plastic tube; 58. Ignition cotton. Detailed Implementation

[0028] 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.

[0029] Example: Reference Figure 1 , Figure 2 , Figure 13 , Figure 15 , Figure 16 and Figure 17 A low-cost plastic-embedded metal junction box includes a junction box body 1. A grounding aluminum base 2 is provided on one side of the junction box body 1, embedded inside the junction box body 1. A wire harness assembly is provided on one side of the junction box body 1 for concentrating the wires entering the junction box body 1. The wire harness assembly includes a fixing ring 3, located on one side of the junction box body 1. Several wire-bundling blocks 4 are provided on one side of the fixing ring 3. A rack 5 is fixedly installed on the side of the wire-bundling blocks 4 near the fixing ring 3. A T-slot 6 is formed on one side of the rack 5. Several sliding rods 7 are fixedly installed on the side of the fixing ring 3 near the wire-bundling blocks 4, slidably connected to the T-slots 6. An external gear ring 8 is provided on the side of the fixed ring 3 near the wire harness block 4. Several mounting shafts 9 are fixedly installed on one side of the fixed ring 3. A first gear 10 is movably sleeved on the outer circular wall of the mounting shaft 9. The first gear 10 meshes with the external gear ring 8. A second gear 11 is movably sleeved on the outer circular wall of the mounting shaft 9. The first gear 10 and the second gear 11 are fixedly installed. The second gear 11 meshes with the rack 5. Two arc-shaped holes 12 are opened on one side of the fixed ring 3. An operating table 13 and a pulley table 14 are fixedly installed on one side of the external gear ring 8. The operating table 13 and the pulley table 14 are slidably connected to the two arc-shaped holes 12 respectively. The junction box body 1 is made of plastic, and the grounding aluminum base 2 is made of metal aluminum. refer to Figure 1 , Figure 13 and Figure 15 The wire harness block 4 has a shrinkage groove 37 on its outside. A guide rod 38 is movably sleeved inside the shrinkage groove 37. Several friction blocks 39 are arranged between several wire harness blocks 4. The guide rod 38 is fixedly installed with the friction blocks 39. A second spring 40 is movably sleeved on the outer circular wall of the guide rod 38. The two ends of the second spring 40 are fixedly installed with the wire harness block 4 and the friction block 39 respectively. The junction box body 1 is made entirely of plastic, while the grounding aluminum base 2 is made of aluminum. The grounding aluminum base 2 serves as the integrated grounding terminal embedded in the junction box body 1, combining the insulation and lightweight properties of plastic with the reliable grounding performance of metal. This avoids the drawbacks of using either all-metal or all-plastic junction boxes. The plastic body provides insulation, lightweight construction, and low cost, while the aluminum grounding base ensures reliable grounding and meets electrical safety requirements. During wiring, external wires pass through the wiring port of the junction box body 1 and enter the interior. Rotating the operating table 13 causes it to slide along the arc-shaped hole 12, driving the external gear ring 8 and... The pulley table 14 rotates synchronously, the outer gear ring 8 meshes with the first gear 10, the first gear 10 drives the second gear 11 to rotate, the second gear 11 meshes with the rack 5 to move linearly, and multiple racks 5 synchronously drive their respective fixed wire harness blocks 4 to move radially. When the outer gear ring 8 rotates counterclockwise, the wire harness blocks 4 spread outward from the center of the fixed ring 3, expanding the wire threading space. After the wire passes through, the outer gear ring 8 rotates clockwise, and the wire harness blocks 4 synchronously move towards the center to clamp the wire, realizing rapid wire harnessing. The gear and rack linkage ensures that the stroke of multiple wire harness blocks 4 is consistent, automatically aligns, and avoids eccentric clamping. When the wire bundle 4 moves towards the center, the friction block 39 first contacts the wire. As the wire bundle 4 continues to approach, the friction block 39 is pressed, pushing the guide rod 38 to retract into the shrinkage groove 37 and compressing the second spring 40. The elastic reaction force of the spring keeps the friction block 39 in contact with the surface of the wire, achieving adaptive elastic clamping, avoiding hard squeezing and damage to the wire. The spring buffer adapts to different wire diameters, requiring no manual adjustment. The clamping force is uniform, avoiding rigid contact that scratches the insulation layer or breaks the wire core.

[0030] Based on the above embodiments, refer to Figure 1 , Figure 13 , Figure 17 , Figure 18 , Figure 19 and Figure 20One end of the operating table 13 is provided with a limiting component for locking the rotated external gear ring 8. The limiting component includes a pressing groove 15, which is located at one end of the operating table 13. A compression groove 16 is provided on one side of the interior of the operating table 13. A first spring 17 is fixedly installed on the bottom surface of the compression groove 16. A pressure block 18 is movably sleeved inside the pressing groove 15. The pressure block 18 is movably sleeved with the compression groove 16 and is fixedly installed with the first spring 17. A springback groove 19 is provided on the outer circular wall of the operating table 13. The springback groove 19 is connected to the pressing groove 15. 5 are connected. A snap-fit ​​bracket 20 is fixedly installed on one side of the pressure block 18. The snap-fit ​​bracket 20 is slidably connected to the spring groove 19. A first semi-circular frame 21 is fixedly installed on one side of the fixed ring 3. Several slots 22 are opened on one side of the inner side of the first semi-circular frame 21. The snap-fit ​​bracket 20 is movably snapped into the slots 22. A second semi-circular frame 23 is fixedly installed on one side of the fixed ring 3. An iron sheet 24 is fixedly installed on one side of the second semi-circular frame 23. Several movable wheels 26 are fixedly installed on one side of the inner side of the iron sheet 24. A magnet 25 is fixedly installed on the outer circular wall of the pulley table 14. Before rotating the outer gear ring 8, the pressure block 18 is pressed to compress the first spring 17, which drives the snap-fit ​​bracket 20 downward to disengage from the slot 22. After the operating table 13 is rotated into place, the pressure block 18 is released, and the first spring 17 pushes the snap-fit ​​bracket 20 back into the corresponding slot 22, locking the outer gear ring 8, thereby preventing the wire harness block 4 from being accidentally loosened. The snap-fit ​​bracket 20 and the slot 22 cooperate to ensure that the clamping force after wire harnessing is constant, preventing the wire harness block from being displaced due to vibration or external force. When the external gear ring 8 rotates, the pulley table 14 moves along the second semi-circular frame 23. The magnet 25 on the pulley table 14 and the iron plate 24 generate magnetic attraction, which applies uniform damping to the rotation and prevents over-adjustment or loosening due to inertia. At the same time, the movable wheel 26 rolls to support the pulley table 14, reducing sliding friction wear. The magnetic attraction provides smooth rotational resistance, improves the operating feel, and prevents accidental rotation. The movable wheel 26 converts sliding friction into rolling friction, extending the service life of the mechanism.

[0031] Based on the above embodiments, refer to Figure 1 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14A connection assembly for quick assembly and disassembly of the fixing ring 3 and the cable bundle 4 is provided on one side of the junction box body 1. The connection assembly includes several docking posts 27, which are all fixedly installed on one side of the junction box body 1. A docking groove 28 is opened on one side of the docking post 27, and a spiral groove 29 is opened inside the docking post 27. The docking groove 28 and the spiral groove 29 are connected. A groove 30 is opened inside the spiral groove 29. Several connecting rods 31 are fixedly installed on one end of the fixing ring 3. One end of 1 is provided with a movable groove 32. A bearing 33 is fixedly sleeved inside the movable groove 32. A rotating cover 34 is movably sleeved inside the movable groove 32. The rotating cover 34 is fixedly sleeved with the inner circular wall of the inner ring of the bearing 33. A movable column 35 is fixedly installed on the outer circular wall of the rotating cover 34. A rotating wheel 36 is movably sleeved on the outer circular wall of the movable column 35. The connecting rod 31 and the rotating cover 34 are movably sleeved with the docking column 27. The movable column 35 is movably engaged with the groove 30. The rotating wheel 36 is slidably connected with the spiral groove 29. Before wiring, by pulling the fixing ring 3, the connecting rod 31 and the rotating cover 34 are pulled out from the docking post 27 through the rotating cover 34. The cover is then removed to expose the internal wiring area. After wiring and bundling, the moving post 35 and the rotating wheel 36 are placed into the docking groove 28 and pushed into the spiral groove 29. As the push continues, the rotating wheel 36 moves along the spiral groove 29, causing the rotating cover 34 to rotate until the moving post 35 is engaged in the groove 30, achieving self-locking fixation. The spiral groove guide and the groove limit are combined, allowing the cover to be installed or removed without tools.

[0032] Based on the above embodiments, refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 Several fixed rods 41 are fixedly installed on one side of the inside of the junction box body 1. The outer circular wall of the fixed rod 41 is provided with a sliding groove 42. Two rotating grooves 43 are provided on the outer circular wall of the fixed rod 41. The rotating grooves 43 are connected to the sliding grooves 42. A rotating tube 44 is movably sleeved on the outer circular wall of the fixed rod 41. Several linear guides 45 are fixedly installed on the outer circular wall of the rotating tube 44. Two moving blocks 46 are fixedly installed on the inner circular wall of the rotating tube 44. The moving blocks 46 are slidably connected to the sliding grooves 42 and the rotating grooves 43 respectively. When there are many wires inside, the rotating tube 44 is inserted into the fixed rod 41 by setting the guide line 45. The moving block 46 slides along the slide groove 42 and enters the rotating groove 43. After the guide line 45 hooks the wire, it swings downward under its own weight and presses on the surface of the wire to achieve the straightening of the wire. The guide line 45 presses the wire with its own weight to prevent it from becoming loose or crossing.

[0033] Based on the above embodiments, refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The junction box body 1 has a protective component for cutting off the wires connected to it. The protective component includes a mounting ring 47, which is fixedly installed on the inside of the junction box body 1. The outer circular wall of the mounting ring 47 has two scissor holes 48. A fixing post 49 is fixedly installed inside the scissor holes 48. A torsion spring 50 is movably sleeved on the outer circular wall of the fixing post 49. A rotating sleeve 51 is movably sleeved on the outer circular wall of the fixing post 49. A ring blade 52 is fixedly installed on the outer circular wall of the rotating sleeve 51. A locking groove 53 is provided on the outer circular wall of the rotating sleeve 51. A snap-fit ​​groove 54 is provided on both sides of the mounting ring 47. A stabilizing block 56 is movably snapped inside the snap-fit ​​groove 54. A locking block 55 is provided between the two stabilizing blocks 56. Several fusible plastic tubes 57 are fixedly installed inside the locking block 55. The fusible plastic tubes 57 are fixedly installed with the stabilizing blocks 56. The locking block 55 and the stabilizing blocks 56 are spaced apart. A tinder 58 is fixedly installed inside the scissor holes 48. With the ring cutter 52 in the initial state, and in the normal state, the rotating sleeve 51 is twisted and compresses the torsion spring 50. The two staggered and symmetrical ring cutters 52 are hidden on both sides of the scissor hole 48, without interfering with the normal passage of wires. At the same time, the locking block 55 is kept apart by the fusible plastic tube 57 and the stabilizing block 56, restraining the release of the torsion spring 50. When the wires inside or outside the junction box generate an open flame due to overload, short circuit, or other reasons, the flame first ignites the ignition cotton 58 set below the fusible plastic tube 57. The ignition cotton 58 burns rapidly, and the flame spreads upward to the fusible plastic tube 57. The fusible plastic tube 57 melts rapidly after being exposed to fire. The melting point is designed to be about 120~160℃, causing the locking block 55 to melt. The support between 5 and the stabilizing block 56 suddenly disappears. At this moment, the compressed torsion spring 50 instantly releases the stored mechanical energy, driving the rotating sleeve 51 and the ring blade 52 to rebound at high speed. The two ring blades 52 interlock with each other in a scissor-like motion, instantly cutting off the wire passing through the junction box. This cutting action occurs before the wire insulation layer has burned extensively, physically blocking the path of the fire to spread along the cable to the distribution box or load end. The entire triggering mechanism is based entirely on mechanical energy storage and thermoplastic materials, without relying on any electronic sensors or external power sources. It can still operate reliably even if the line burns out and the voltage disappears, providing intrinsically safe fire protection for photovoltaic, energy storage, building electrical and other scenarios.

[0034] Working principle: Please refer to Figures 1-20As shown, the junction box body 1 is made entirely of plastic, while the grounding aluminum base 2 is made of aluminum. The grounding aluminum base 2 serves as the overall grounding point, allowing the junction box body 1 to connect seamlessly, avoiding the use of all-aluminum or all-plastic junction box bodies 1. When wiring the inside of the junction box body 1, the external wire is passed through the wiring in the junction box body 1 and then into its interior. Subsequently, by rotating the operating table 13, it slides along the inside of the arc-shaped hole 12, thereby driving the external gear ring 8 and the pulley table 14 to rotate. The pulley table 14 rotates inside the second arc-shaped hole 12. When the external gear ring 8 rotates, it meshes and drives the first gear 10 to rotate. The first gear 10 drives the second gear 11 to rotate, and then the second gear 11 meshes and drives the rack 5 to rotate vertically. As the wires move, several racks 5 move simultaneously, each driving the wire harness blocks 4 installed with the racks 5 to move synchronously. By rotating the outer gear ring 8 counterclockwise, multiple wire harness blocks 4 can move and spread outwards from the center of the fixed ring 3, thereby expanding the space between multiple wire harness blocks 4. When the external wire passes through the wiring port of the junction box body 1 into the interior of the junction box body 1, the wire will pass between several wire harness blocks 4 and through the fixed ring 3 to reach the interior of the junction box body 1. After the wiring is completed, by rotating the outer gear ring 8 clockwise, the first gear 10 and the second gear 11 are engaged and rotated, causing several wire harness blocks 4 to move simultaneously and move closer to each other. Then, multiple wire harness blocks 4 will approach the wire, thereby securing the wire to the inside of the junction box body 1.

[0035] When several wire-bundling blocks 4 bundle the wires using the friction block 39, the wire-bundling blocks 4 will cause the friction block 39 to first contact the wires. As the several wire-bundling blocks 4 gradually approach each other, the friction block 39 encounters resistance from the wires, and the wire-bundling blocks 4 will compress the second spring 40 to move. Then the guide rod 38 will retract into the shrinkage groove 37, so that the several friction blocks 39 can clamp the wires.

[0036] When the operator rotates the outer gear ring 8 using the snap-fit ​​bracket 20, the pressure block 18 is pressed and the first spring 17 is compressed. The pressure block 18 then moves the snap-fit ​​bracket 20 downward, allowing it to move from inside the slot 22. Subsequently, the pressure block 18 is pushed to rotate the operating table 13 and the outer gear ring 8. After the outer gear ring 8 rotates, the pressure block 18 is released, and the first spring 17 causes the pressure block 18 and the snap-fit ​​bracket 20 to spring back and reset. The snap-fit ​​bracket 20 then enters the slot 22, thus restricting the rotated outer gear ring 8 and also restricting the wire harness block 4, preventing the wire harness block 4 from moving.

[0037] When the external gear ring 8 drives the pulley table 14 to move, the pulley table 14 will drive the magnet 25 to move along the surface of the second semi-circular frame 23. During the movement, the magnet 25 and the iron plate 24 attract each other, thus generating resistance. This resistance can be applied to the rotating external gear ring 8 to prevent the external gear ring 8 from rotating past the target position due to rotational inertia when quickly tying the wire clockwise or releasing it counterclockwise, which would cause the wire tying block 4 to be clamped too tightly or too loosely. The magnetic damping makes the rotation process stable, allowing the operator to accurately control the radial position of the wire tying block 4. At the same time, the uniform resistance provides clear force feedback, avoiding damage to the wire insulation layer due to excessive operation. Furthermore, the pulley table 14 moves along the movable wheel 26 during the movement. The rotation of the movable wheel 26 can reduce frictional damage during the movement of the pulley table 14.

[0038] Before wiring inside the junction box body 1 using the rotating cover 34, the connecting rod 31 and the rotating cover 34 are moved inside the docking post 27 by pulling the fixing ring 3, thereby removing the external part of the junction box body 1 from the fixing ring 3. After the wiring inside the junction box body 1 is completed, the wires pass through the fixing ring 3 and are bundled through multiple wire harnesses 4. Then, the connecting rod 31 and the rotating cover 34 are moved by moving the fixing ring 3, bringing the rotating cover 34 close to the docking post 27. Finally, the moving post 35 and the rotating wheel 36 are placed into the docking groove 2. Inside the 8, the moving column 35 and the rotating wheel 36 pass through the docking groove 28 to the inside of the spiral groove 29. Then, by pushing the fixing ring 3, the connecting rod 31 and the rotating cover 34 are squeezed to move into the inside of the docking column 27. The moving column 35 and the rotating wheel 36 will move along the inside of the spiral groove 29. While the moving column 35 and the rotating wheel 36 are moving, they will drive the rotating cover 34 to rotate. When the moving column 35 reaches the position of the groove 30, it will restrict the rotating cover 34 and the connecting rod 31, so as to facilitate the installation of the fixing ring 3 at the wiring port of the junction box body 1.

[0039] When there are many wires inside the junction box body 1, the rotating tube 44 is first inserted into the outside of the fixed rod 41 by setting the wire management line 45. Then, the moving block 46 slides into the inside of the slide groove 42. At this time, the connection between the slide groove 42 and the moving block 46 can restrict the rotating tube 44 to the outside of the fixed rod 41. Then, the wires are hooked by putting the wires into the inside of the multiple wire management lines 45. Then, the moving block 46 is moved by pushing the wire management line 45, so that the moving block 46 enters the inside of the rotating groove 43. At this time, the moving block 46 can rotate inside the rotating groove 43. Then, the downward weight of the wire management line 45 will drive the rotating tube 44 to rotate downward, so that the wire management line 45 can press on the surface of the wires, which is convenient for wire management inside the junction box body 1.

[0040] When the junction box body 1 catches fire or the external wires catch fire, the two staggered and symmetrical ring blades 52 can cut off the wires entering the junction box body 1 by approaching and crossing each other.

[0041] With the fusible plastic tube 57 in place, the ring blade 52 is initially inside the scissor hole 48. First, the rotating sleeve 51 is rotated to compress the torsion spring 50, causing the two ring blades 52 to separate and hide inside the scissor hole 48. When exposed to an open flame, the fire first ignites the igniting cotton 58. After the igniting cotton 58 catches fire, it spreads upwards to the position of the locking block 55. Then, the ignition of the igniting cotton 58 melts the fusible plastic tube 57. Since there is a gap between the two stabilizing blocks 56 and the locking block 55, when the fusible plastic tube 57 melts, the resistance of the torsion spring 50 disappears. Then, the torsion spring 50 will drive the rotating sleeve 51, the locking block 55, and the ring blades 52 to rebound instantly, allowing the two ring blades 52 to cut the wire crosswise.

[0042] 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 low-cost junction box with plastic embedded in metal, characterized in that, include: Junction box body (1), a grounding aluminum base (2) is provided on one side of the junction box body (1), and the grounding aluminum base (2) is embedded inside the junction box body (1); A wire harness assembly is disposed on one side of the junction box body (1) for concentrating the wires connected to the junction box body (1). The wire harness assembly includes: a fixing ring (3), which is disposed on one side of the junction box body (1). A plurality of wire harness blocks (4) are disposed on one side of the fixing ring (3). A rack (5) is fixedly installed on the side of the wire harness block (4) near the fixing ring (3). A T-slot (6) is provided on one side of the rack (5). A plurality of sliding rods (7) are fixedly installed on the side of the fixing ring (3) near the wire harness block (4). The sliding rods (7) are slidably connected to the T-slot (6). An external gear ring (8) is disposed on the side of the fixing ring (3) near the wire harness block (4). A number of mounting shafts (9) are fixedly installed. A first gear (10) is movably sleeved on the outer circular wall of the mounting shaft (9). The first gear (10) meshes with the outer gear ring (8). A second gear (11) is movably sleeved on the outer circular wall of the mounting shaft (9). The first gear (10) and the second gear (11) are fixedly installed. The second gear (11) meshes with the rack (5). Two arc-shaped holes (12) are opened on one side of the fixed ring (3). An operating table (13) and a pulley table (14) are fixedly installed on one side of the outer gear ring (8). The operating table (13) and the pulley table (14) are slidably connected to the two arc-shaped holes (12) respectively. The junction box body (1) is made of plastic, and the grounding aluminum base (2) is made of metal aluminum.

2. The low-cost junction box with plastic embedded metal according to claim 1, characterized in that, One end of the operating table (13) is provided with a limiting component for locking the external gear ring (8) after rotation, the limiting component including: A pressing groove (15) is formed at one end of the operating table (13). A compression groove (16) is formed on one side of the inside of the operating table (13). A first spring (17) is fixedly installed on the bottom surface of the inside of the compression groove (16). A pressure block (18) is movably sleeved inside the pressing groove (15). The pressure block (18) is movably sleeved with the compression groove (16). The pressure block (18) is fixedly installed with the first spring (17). The operating table (13) The outer circular wall of the pressure block (18) is provided with a spring groove (19), which is connected to the pressing groove (15). A snap-fit ​​bracket (20) is fixedly installed on one side of the pressure block (18), and the snap-fit ​​bracket (20) is slidably connected to the spring groove (19). A first semi-circular frame (21) is fixedly installed on one side of the fixing ring (3), and a number of snap-fit ​​slots (22) are provided on one side of the inner side of the first semi-circular frame (21). The snap-fit ​​bracket (20) is movably snapped into the snap-fit ​​slots (22).

3. A low-cost junction box with plastic embedded in metal according to claim 1, characterized in that, One side of the junction box body (1) is provided with a connecting assembly for quick assembly and disassembly of the fixing ring (3) and the wire harness block (4), the connecting assembly including: A plurality of docking posts (27) are fixedly installed on one side of the junction box body (1). A docking groove (28) is provided on one side of each docking post (27). A spiral groove (29) is provided inside each docking post (27). The docking groove (28) is connected to the spiral groove (29). A groove (30) is provided inside the spiral groove (29). A plurality of connecting rods (31) are fixedly installed on one end of the fixing ring (3). A movable groove (32) is provided on one end of each connecting rod (31). A fixed sleeve is provided inside the movable groove (32). A bearing (33) is connected to the inside of the movable groove (32), and a rotating cover (34) is movably sleeved therein. The rotating cover (34) is fixedly sleeved with the inner circular wall of the inner ring of the bearing (33). A movable column (35) is fixedly installed on the outer circular wall of the rotating cover (34). A rotating wheel (36) is movably sleeved on the outer circular wall of the movable column (35). The connecting rod (31) and the rotating cover (34) are movably sleeved with the docking column (27). The movable column (35) is movably engaged with the groove (30). The rotating wheel (36) is slidably connected with the spiral groove (29).

4. A low-cost junction box with plastic embedded in metal according to claim 1, characterized in that: The wire harness block (4) has a shrinkage groove (37) on its outside. A guide rod (38) is movably sleeved inside the shrinkage groove (37). Several friction blocks (39) are arranged between several wire harness blocks (4). The guide rod (38) is fixedly installed with the friction block (39). A second spring (40) is movably sleeved on the outer circular wall of the guide rod (38). The two ends of the second spring (40) are fixedly installed with the wire harness block (4) and the friction block (39) respectively.

5. A low-cost junction box with plastic embedded in metal according to claim 1, characterized in that: Several fixed rods (41) are fixedly installed on one side of the inside of the junction box body (1). The outer circular wall of the fixed rod (41) is provided with a sliding groove (42). The outer circular wall of the fixed rod (41) is provided with two rotating grooves (43). The rotating grooves (43) are connected to the sliding grooves (42). A rotating tube (44) is movably sleeved on the outer circular wall of the fixed rod (41). Several linear guides (45) are fixedly installed on the outer circular wall of the rotating tube (44). Two moving blocks (46) are fixedly installed on the inner circular wall of the rotating tube (44). The moving blocks (46) are slidably connected to the sliding grooves (42) and the rotating grooves (43) respectively.

6. A low-cost junction box with plastic embedded in metal according to claim 1, characterized in that, A protective component for cutting off the wires connected to the inside of the junction box body (1) is provided on one side of the interior. The protective component includes: Mounting ring (47) is fixedly installed on one side inside the junction box body (1). Two scissor holes (48) are opened on the outer circular wall of the mounting ring (47). A fixing post (49) is fixedly installed inside the scissor hole (48). A torsion spring (50) is movably sleeved on the outer circular wall of the fixing post (49). A rotating sleeve (51) is movably sleeved on the outer circular wall of the fixing post (49). A ring blade (52) is fixedly installed on the outer circular wall of the rotating sleeve (51).

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