Junction box waterproof and connecting piece transformation method

Abstract

An upper cover annular groove is formed in a port of an upper cover, a first sealing ring is arranged in the upper cover annular groove, an annular butt joint protruding block is formed at a port of a lower cover, and the annular butt joint protruding block and the upper cover annular groove are configured to be in clearance fit. The annular butt joint protruding block is aligned and pressed into the annular groove of the upper cover, the upper cover and the lower cover are locked through the fastener, the annular butt joint protruding block extrudes the first sealing ring, the first sealing ring deforms and fills the gap between the annular butt joint protruding block and the annular groove of the upper cover, and the waterproof sealing performance of the junction box is improved. A rotatable connecting piece is arranged on a bottom plate of the lower cover, a long groove is formed in the connecting piece, the long groove is divided into an inlet section, a sliding section and a limiting section in the height direction, an anti-disengaging step is formed between the inlet section and the sliding section, the limiting section is of an inverted trapezoidal section, and a nut of the circuit board is embedded into the limiting section through the inlet section, pushed along the sliding section and clamped into the limiting section. The circuit board mounting and locking device is suitable for circuit boards of various specifications and sizes.

Description

Technical Field

[0001] This invention relates to the field of junction box technology, and specifically to a method for waterproofing junction boxes and modifying connectors. Background Technology

[0002] The weighbridge consists of multiple sensors, a weighing body, a junction box, and a display instrument. The junction box contains connectors for connecting to the circuit board. Chinese Patent No. CN 203774712 U discloses a waterproof junction box, including a box body, a sealing ring, a cover covering the box body, and multiple waterproof connectors. The multiple waterproof connectors are located on the surface of the cover, and the waterproof connectors and the cover are an integral structure.

[0003] Furthermore, Chinese Patent No. CN 207705956 U also discloses a waterproof junction box, including an upper cover, a lower cover, and a sealing ring; the upper cover has an annular sealing ring placement hole with a U-shaped cross section at the inner edge of the outer side wall, and the sealing ring is placed in the sealing ring placement hole; the lower cover has an annular step with an L-shaped cross section at the position where it mates with the sealing ring, and this step also mates with the sealing ring; the sealing ring is H-shaped in general, with outward protrusions at the top and bottom, and a J-shaped claw end on the inner side of the sealing ring.

[0004] However, existing waterproof junction boxes have poor waterproof performance, and water can easily enter the junction boxes during rainy weather, causing the weighbridge to malfunction. In addition, the fixed distribution of connectors inside the existing junction boxes limits the mounting hole positions of the circuit board and makes it unsuitable for various types of circuit boards.

[0005] Therefore, how to effectively improve the waterproof performance of junction boxes and increase the effective coverage of mounting holes on circuit boards to make them suitable for various circuit boards has become an urgent problem to be solved in this field. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a method for waterproofing junction boxes and modifying connectors that has good waterproof performance and is applicable to various circuit boards.

[0007] To achieve the above objectives, the present invention provides a method for waterproofing junction boxes and modifying connectors. The junction box is equipped with a waterproof connector and includes an upper cover and a lower cover. An annular groove is formed in the port of the upper cover, and a first sealing ring is placed in the annular groove. An annular mating protrusion is formed at the port of the lower cover. The annular mating protrusion and the annular groove of the upper cover are configured to fit with a clearance. The annular mating protrusion is aligned and pressed into the annular groove of the upper cover. The upper cover and the lower cover are locked by fasteners, so that the annular mating protrusion squeezes the first sealing ring, causing the first sealing ring to deform and fill the gap between the annular mating protrusion and the annular groove of the upper cover. A rotatable connector is provided on the bottom plate of the lower cover, and an elongated groove is formed on the connector. The elongated groove is divided into an inlet section, a sliding section, and a limiting section along the height direction. An anti-detachment step is formed between the inlet section and the sliding section. The limiting section has an inverted trapezoidal cross section. The nut of the circuit board is inserted through the inlet section, pushed along the sliding section, and locked into the limiting section, thus completing the installation and locking of the circuit board.

[0008] Furthermore, the connector includes a first connector and a second connector, wherein the length of the first connector is shorter than that of the second connector.

[0009] Furthermore, the first connector is deployed in the first two end areas of the base plate, and the second connector is deployed in the second two end areas of the base plate.

[0010] Furthermore, the diameter of the inlet section is configured to be smaller than the diameter of the nut on the circuit board.

[0011] Furthermore, an installation section for accommodating a nut is formed extending along the bottom of the limiting section.

[0012] Furthermore, mounting ears are formed on both sides of the upper and lower covers respectively.

[0013] Furthermore, an annular groove is formed in the port of the lower cover, and a second sealing ring is placed in the annular groove. An annular end face is formed at the port of the upper cover. When the annular mating protrusion is aligned and pressed into the annular groove of the upper cover, the annular end face of the upper cover simultaneously presses against the annular groove of the lower cover. The upper cover and the lower cover are locked by fasteners, so that the annular end face squeezes the second sealing ring. The second sealing ring deforms and fills the gap between the annular end face and the annular groove of the lower cover.

[0014] Furthermore, the annular grooves on the upper cover and the lower cover are opposite to each other and staggered.

[0015] Furthermore, there is a depth difference between the annular groove on the upper cover and the annular groove on the lower cover.

[0016] The junction box waterproofing and connector modification method provided by this invention, through the assembly and tightening of the upper and lower covers, allows the first sealing ring to fully deform and tightly fill the gap between the annular mating protrusion and the annular groove of the upper cover, forming a reliable multi-directional seal, thereby improving the waterproof sealing performance of the junction box; at the same time, through the rotatable connector and its internal long groove structure, the connection position of the circuit board can be flexibly adjusted during installation, greatly increasing the effective adaptation range of the circuit board mounting holes, and making it suitable for circuit boards of various specifications and sizes, thereby improving the installation compatibility and convenience of the junction box. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the upper cover in this invention; Figure 2 This is a schematic diagram of the structure of the lower cover in this invention; Figure 3 This is a schematic diagram of the assembly of the upper cover and the lower cover in this invention; Figure 4 for Figure 3 A magnified view of a portion of the image; Figure 5 and Figure 6 This is a schematic diagram of the connector structure in this invention; Figure 7 This is a schematic diagram of the long groove in the present invention; Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 9 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 10 This is a schematic diagram of the structure of Embodiment 4 of the present invention; Figure 11 and Figure 12 This is a structural schematic diagram of Embodiment 5 of the present invention.

[0019] Figure label: 1. Top cover; 11. Annular groove on top cover; 12. First sealing ring; 13. Waterproof eaves; 14. Drainage outlet; 15. Annular end face; 2. Lower cover; 21. Annular mating protrusion; 22. Base plate; 23. Connector; 2301. First connector; 2302. Second connector; 24. Long groove; 241. Inlet section; 2411. Guide slope; 242. Sliding section; 243. Limiting section; 244. Mounting section; 25. Mounting groove; 26. Diversion channel; 261. Drainage hole; 27. Protrusion sealing ring; 28. Lower cover annular groove; 29. ​​Second sealing ring; 3. Install the ear plate. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0021] Example 1 See Figure 1 and Figure 2 The illustration shows an example of the junction box waterproofing and connector modification method provided by the present invention.

[0022] The junction box includes an upper cover 1 and a lower cover 2. An annular groove 11 is formed in the port of the upper cover 1, and a first sealing ring 12 is placed in the annular groove 11. An annular mating protrusion 21 is formed at the port of the lower cover 2. The annular mating protrusion 21 and the annular groove 11 of the upper cover are configured to fit with a clearance. The annular mating protrusion 21 is aligned and pressed into the annular groove 11 of the upper cover. The upper cover 1 and the lower cover 2 are locked by fasteners, so that the annular mating protrusion 21 compresses the first sealing ring 12, causing the first sealing ring 12 to deform and fill the gap between the annular mating protrusion 21 and the annular groove 11 of the upper cover, forming a reliable multi-directional seal, thereby improving the waterproof sealing performance of the junction box.

[0023] Furthermore, a rotatable connector 23 is provided on the base plate 22 of the lower cover 2, and an elongated groove 24 is provided on the connector 23. The connector 23 can be rotated during installation to flexibly adjust the connection position of the circuit board, which greatly increases the effective adaptation range of the circuit board mounting holes and is suitable for circuit boards of various specifications and sizes, thereby improving the installation compatibility and convenience of the junction box.

[0024] Combination Figures 1 to 4 Specifically, the upper cover 1 has an annular groove 11 at one end, and the lower cover 2 has an annular mating protrusion 21 at one end. The volume of the annular groove 11 is larger than the volume of the annular mating protrusion 21, so that when the upper cover 1 and the lower cover 2 are assembled, the annular mating protrusion 21 can be easily aligned and inserted into the annular groove 11, and the annular mating protrusion 21 and the annular groove 11 are configured to have a clearance fit. At the same time, the annular groove 11 can provide space for the compression deformation of the first sealing ring 12.

[0025] Before assembling the upper cover 1 and the lower cover 2, a first sealing ring 12 is placed in the annular groove 11 of the upper cover. Preferably, the first sealing ring 12 is made of a nitrile O-ring with good wear resistance and elasticity. The wire diameter of the first sealing ring 12 is adapted to or slightly smaller than the depth of the annular groove 11 of the upper cover, so that the first sealing ring 12 can be compressed and deformed to fill the gap between the annular mating protrusion 21 and the annular groove 11 of the upper cover.

[0026] In this way, the upper cover 1 and the lower cover 2 are assembled, the annular mating protrusion 21 is aligned and pressed into the annular groove 11 of the upper cover, and the first sealing ring 12 located in the annular groove 11 of the upper cover is precisely squeezed, so that the annular mating protrusion 21 and the annular groove 11 of the upper cover together form a closed cavity.

[0027] Combination Figure 4Simultaneously, by fastening the upper cover 1 and the lower cover 2, the annular mating protrusion 21 and the inner wall of the annular groove 11 of the upper cover are simultaneously pressed against the first sealing ring 12, so that the first sealing ring 12 is subjected to radial and axial compression at the same time and undergoes elastic deformation, so as to completely fill the closed cavity between the annular mating protrusion 21 and the annular groove 11 of the upper cover, thereby blocking the water vapor penetration path between the upper cover 1 and the lower cover 2, forming a reliable multi-directional seal, and improving the waterproof sealing performance of the junction box.

[0028] Here, the fasteners are preferably composed of a male and female locking system. The male locking hexagonal screw is located on the lower cover 2, and the female locking nut is located on the upper cover 1. When tightening, only the female locking nut needs to be tightened, which improves the ease and efficiency of assembly between the upper cover 1 and the lower cover 2, and makes the fasteners removable, replaceable, and easy to maintain.

[0029] Furthermore, the junction box is equipped with a waterproof connector, which is a conventional technical means in this field and will not be described in detail here.

[0030] To facilitate the assembly of the upper cover 1 and the lower cover 2, mounting ear plates 3 are formed on both sides of the upper cover 1 and the lower cover 2 respectively.

[0031] The upper cover 1 and lower cover 2 thus formed can effectively improve the waterproof performance of the junction box.

[0032] Combination Figure 2 In order to increase the effective adaptation range of the circuit board mounting holes and make it suitable for circuit boards of various sizes, a rotatable connector 23 is provided on the bottom plate 22 of the lower cover 2. By rotating the connector 23, the connection position of the circuit board can be adjusted, which greatly increases the effective adaptation range of the circuit board mounting holes.

[0033] Combination Figures 5 to 7 Specifically, the connector 23 has an elongated groove 24 and an installation groove 25. A rotating shaft passes through the installation groove 25 to achieve a rotatable connection between the connector 23 and the base plate 22, so that the connector 23 can rotate around the installation groove 25 on the base plate 22 and drive the elongated groove 24 to rotate synchronously.

[0034] Therefore, by rotating the connector 23 to change the orientation of the long groove 24, and then moving the nut linearly along the long groove 24, the installation position of the circuit board can be flexibly adjusted within the plane of the base plate 22, thereby increasing the effective coverage of the circuit board mounting holes.

[0035] Combination Figure 7 Furthermore, the long slot 24 is divided into an entrance section 241, a sliding section 242, and a limiting section 243 along the height direction, so that the nut of the circuit board can pass through the entrance section 241 into the long slot 24, slide in the sliding section 242 to determine the connection position, and finally be locked into the limiting section 243 to realize the installation and locking of the circuit board.

[0036] The inlet section 241 and the sliding section 242 are configured in a stepped distribution to form an anti-detachment step. The diameter of the inlet section 241 is configured to be smaller than the diameter of the nut head on the circuit board, so that the inlet section 241 and the nut on the circuit board form an interference fit. When installing the nut, the nut needs to be squeezed so that the nut can be inserted into the long groove 24 through the inlet section 241, so that the inlet section 241 limits the nut and prevents the nut from falling off.

[0037] Furthermore, the diameter of the sliding section 242 is adapted to or slightly larger than the nut head, so that after the nut passes through the inlet section 241, it can easily enter the sliding section 24 and move freely axially along the long groove 24 through the sliding section 242, thereby adjusting the connection position between the nut and the mounting plate and achieving the initial positioning of the nut.

[0038] In conjunction with this, the limiting section 243 is configured with an inverted trapezoidal cross section, and an installation section 244 is formed along the bottom of the limiting section 243 to accommodate the threaded portion of the nut, so that when the nut head is accommodated in the sliding section 242, the threaded portion is distributed in the limiting section 243 and the installation section 244.

[0039] Furthermore, the inverted trapezoidal cross-section of the limiting section 243 causes the width of the limiting section 243 to gradually narrow from the top to the bottom. When the nut is tightened, the nut will be pulled towards the gradually narrowing trapezoidal channel of the limiting section 243 under the action of the tightening force. When the nut head is pulled into a sufficiently narrow area, such as near the bottom of the limiting section 243, the rotational movement of the nut will be completely suppressed, thereby achieving reliable mechanical limiting, preventing the nut from rotating, and locking the nut.

[0040] The connector 23 thus formed can adjust the connection position of the circuit board and increase the effective fitting range of the circuit board mounting holes, making it suitable for circuit boards of various sizes. At the same time, the insertion, pushing and locking of the nut in the long slot 24 can effectively improve the connection stability between the circuit board and the connector 23, thereby improving the installation compatibility and convenience of the junction box.

[0041] Combination Figure 2 As a preferred configuration, the connector 23 of the above structure includes a first connector 2301 and a second connector 2302, and the length of the first connector 2301 is less than that of the second connector 2302. In this example, the first connector 2301 is deployed in the first side end area of ​​the base plate 11, and the second connector 2302 is deployed in the second side end area of ​​the base plate 22.

[0042] In this way, the first connector 2301 and the second connector 2302 can form different adjustment ranges. The shorter first connector 2301 can rotate to form a small-diameter installation range and cover the edge of the base plate 22, while the longer second connector 2302 can rotate to form a large-diameter installation range and cover the middle area of ​​the base plate 22. Through the cooperation of the first connector 2301 and the second connector 2302, multiple installation ranges of different radii are provided on the base plate 22 at the same time, and they are superimposed to increase the effective coverage area of ​​the mounting holes of the circuit board, thereby adapting to various types of circuit boards.

[0043] Meanwhile, the first connector 2301 and the second connector 2302 of different lengths can cooperate to give the circuit board greater positional tolerance during installation. For example, if there is a deviation in the mounting hole spacing of the circuit board, a matching installation position can be found by rotating and adjusting the connectors of different sides and lengths, thereby improving the installation compatibility and convenience of the junction box.

[0044] Example 2 Combination Figure 8 Based on Embodiment 1, in order to improve the waterproof performance of the junction box, this modification method also provides a waterproof eaves 13 on the outside of the port of the upper cover 1. The waterproof eaves 13 are distributed around the outside of the upper cover 1, forming a continuous ring of ramps at the port of the upper cover 1 that slope and extend towards the bottom of the junction box.

[0045] Preferably, the waterproof eaves 13 are inclined and extend to cover the joint between the upper cover 1 and the lower cover 2.

[0046] In this way, when water flows from above or to the side of the junction box, the waterproof eaves 13 can effectively block and change the path of the water flow, so that the water flows directly down along the waterproof eaves 13 under the action of gravity and inertia, instead of directly impacting the joint between the upper cover 1 and the lower cover 2, thereby improving the waterproof performance.

[0047] Furthermore, a drainage channel 26 is provided at the port of the lower cover 2. The drainage channel 26 is distributed inside the waterproof eaves 13 and forms a continuous groove on the outside of the port of the lower cover 2, which is inclined towards the bottom of the junction box. A drainage hole 261 is provided at the end of the drainage channel 26.

[0048] In this way, when a small amount of water or water mist crosses the waterproof eaves 13 and enters the joint between the upper cover 1 and the lower cover 2, it will first enter the diversion channel 26. The diversion channel 26 can collect the small amount of water or water mist and guide it out of the drain hole 261 through its own slope, thus avoiding water accumulation at the joint between the upper cover 1 and the lower cover 2 for a long time, which would affect the waterproof sealing performance.

[0049] Therefore, the waterproof eaves 13 and the drainage channel 26 can work together to form a double-layer defense for the junction box, ensuring waterproof performance. At the same time, after the waterproof treatment by the waterproof eaves 13 and the drainage channel 26, the amount of water and pressure reaching the first sealing ring 12 are reduced, which can effectively reduce the sealing pressure of the first sealing ring 12 and extend its service life.

[0050] Example 3 Combination Figure 9 Based on Embodiment 1 and / or Embodiment 2, in order to improve the waterproof performance of the junction box, this modification method also provides a protrusion sealing ring 27 on the annular mating protrusion 21 of the upper cover 2.

[0051] Preferably, the bump sealing ring 27 is composed of an elastic sealing ring.

[0052] In this way, the fastener locks the upper cover 1 and the lower cover 2, and the annular mating protrusion 21 and the annular groove 11 of the upper cover squeeze the first sealing ring 12. At the same time, the first sealing ring 12 undergoes elastic deformation, and the inner wall of the first sealing ring 12 and the annular groove 11 of the upper cover will simultaneously squeeze the protrusion sealing ring 27, so that the first sealing ring 12 and the first protrusion sealing ring 27 simultaneously produce radial and axial elastic deformation to fill the closed cavity formed between the annular mating protrusion 21 and the annular groove 11 of the upper cover.

[0053] Furthermore, the first sealing ring 12 can fill the main area of ​​the closed cavity, and the protruding sealing ring 27 can cooperate with the first sealing ring 12 to further compensate for the existence of small gaps or shape and position deviations, so that the first sealing ring 12 and the protruding sealing ring 27 form a double blocking barrier, which can effectively block the water vapor penetration path between the upper cover 1 and the lower cover 2 and improve the waterproof sealing performance of the junction box.

[0054] Meanwhile, the first protrusion sealing ring 27, as the outermost sealing structure, can effectively protect the first sealing ring 12 and improve the service life of the first sealing ring 12.

[0055] Furthermore, a guide port 14 communicating with the annular groove 11 of the upper cover is also opened on the outer wall of the upper cover 1. Preferably, the guide port 14 is opened at the mating point between the protrusion sealing ring 27 and the first sealing ring 12, and is inclined towards the bottom of the junction box to test the sealing performance of the protrusion sealing ring 27.

[0056] As an example, if the bump seal ring 27 fails, the infiltrated water will accumulate in the gap between the bump seal ring 27 and the first seal ring 12 and be discharged through the drain port 14. By observing or monitoring the amount of water at the outlet of the drain port 14, it can be determined that the bump seal ring 27 has failed. At this time, the first seal ring 12 can still serve as a temporary sealing structure, and maintenance personnel can provide early warning and maintenance before the internal circuit of the junction box is damaged.

[0057] The resulting bump sealing ring 27 can cooperate with the first sealing ring 12 to form a double blocking barrier, effectively improving the waterproof sealing performance of the junction box.

[0058] Example 4 Combination Figure 10 Based on Embodiment 1, in order to improve the connection efficiency between the circuit board and the junction box, this method also provides a guide slope 2411 at the port of the inlet section 241 of the long slot 24, and configures the guide slope 2411 as an outwardly flared horn-shaped slope.

[0059] In this way, when installing the nut, the nut can be more easily guided and squeezed into the inlet section 241 through the guide ramp 2411, so as to realize blind insertion of the nut and improve the installation efficiency of the circuit board.

[0060] At the step where the nut enters, design an outward-flaring, trumpet-shaped guide ramp.

[0061] Example 5 Combination Figure 11 and Figure 12 Based on Embodiment 1, in order to improve the waterproof performance of the junction box, an annular groove 28 is opened in the port of the lower cover 2, and an annular end face 15 is formed at the port of the upper cover 1.

[0062] Furthermore, the upper cover annular groove 21 of the upper cover 1 and the lower cover annular groove 28 of the lower cover 2 are opposite and staggered to facilitate the assembly of the upper cover 1 and the lower cover 2, and the upper cover annular groove 21 and the lower cover annular groove 28 cooperate to form a multi-directional seal.

[0063] Before assembling the upper cover 1 and the lower cover 2, a second sealing ring 29 is placed in the annular groove 28 of the lower cover. Preferably, the second sealing ring 29 is made of a nitrile O-ring with good wear resistance and elasticity. The wire diameter of the second sealing ring 29 is adapted to or slightly smaller than the depth of the annular groove 28 of the lower cover, so that the second sealing ring 29 can be compressed and deformed to fill the gap between the annular end face 15 and the annular groove 11 of the upper cover.

[0064] In this way, when assembling the upper cover 1 and the lower cover 2, aligning the annular mating protrusion 21 and pressing it into the annular groove 11 of the upper cover, and precisely pressing the first sealing ring 12 located in the annular groove 11 of the upper cover, the annular end face 15 of the upper cover 1 will simultaneously press the annular groove 28 of the lower cover, and simultaneously press the second sealing ring 29 located in the annular groove 28 of the lower cover, so that the annular mating protrusion 21 and the annular groove 11 of the upper cover together form the first closed cavity, and the annular end face 15 and the annular groove 28 of the lower cover also simultaneously form the second closed cavity.

[0065] Simultaneously, by fastening the upper cover 1 and the lower cover 2, the annular mating protrusion 21 and the inner wall of the annular groove 11 of the upper cover are simultaneously pressed against the first sealing ring 12, and the annular end face 15 is also simultaneously pressed against the second sealing ring 29. This causes the first sealing ring 12 and the second sealing ring 29 to be compressed and elastically deformed at the same time, so as to completely fill the first closed cavity between the annular mating protrusion 21 and the annular groove 11 of the upper cover, and the second closed cavity between the annular end face 15 and the annular groove 28 of the lower cover. This blocks the water vapor penetration path between the upper cover 1 and the lower cover 2, forming a reliable multi-directional seal and improving the waterproof sealing performance of the junction box.

[0066] Furthermore, the annular mating protrusion 21 and the annular groove 11 of the upper cover cooperate to form the first seal, and the annular end face 15 and the annular groove 28 of the lower cover cooperate to form the second seal, thus forming a multi-directional double-layer sealing structure for the junction box, which can ensure the waterproof sealing performance of the junction box.

[0067] Furthermore, there is a depth difference between the upper cover annular groove 21 and the lower cover annular groove 28 to prevent both the upper cover annular groove 21 and the lower cover annular groove 28 from being immersed in water at the same time, thus ensuring reliable sealing.

[0068] 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 illustrative of the 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 present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for waterproofing a junction box and modifying its connectors, wherein the junction box is equipped with a waterproof connector, and the junction box includes an upper cover and a lower cover, characterized in that... An annular groove is formed in the port of the upper cover, and a first sealing ring is placed in the annular groove. An annular mating protrusion is formed at the port of the lower cover. The annular mating protrusion and the annular groove of the upper cover are configured to fit with a clearance. The annular mating protrusion is aligned and pressed into the annular groove of the upper cover. The upper cover and the lower cover are locked by fasteners, so that the annular mating protrusion squeezes the first sealing ring, causing the first sealing ring to deform and fill the gap between the annular mating protrusion and the annular groove of the upper cover. A rotatable connector is provided on the bottom plate of the lower cover, and an elongated groove is formed on the connector. The elongated groove is divided into an inlet section, a sliding section, and a limiting section along the height direction. An anti-detachment step is formed between the inlet section and the sliding section. The limiting section has an inverted trapezoidal cross section. The nut of the circuit board is inserted through the inlet section, pushed along the sliding section, and locked into the limiting section, thus completing the installation and locking of the circuit board.

2. The method for waterproofing junction boxes and modifying connectors according to claim 1, characterized in that, The connector includes a first connector and a second connector, wherein the length of the first connector is shorter than that of the second connector.

3. The method for waterproofing the junction box and modifying the connectors according to claim 2, characterized in that, The first connector is deployed in the first two ends of the base plate, and the second connector is deployed in the second two ends of the base plate.

4. The method for waterproofing junction boxes and modifying connectors according to claim 1, characterized in that, The diameter of the inlet section is configured to be smaller than the diameter of the nut on the circuit board.

5. The method for waterproofing junction boxes and modifying connectors according to claim 1, characterized in that, An installation section for accommodating a nut is formed extending along the bottom of the limiting section.

6. The method for waterproofing junction boxes and modifying connectors according to claim 1, characterized in that, Mounting ear plates are formed on both sides of the upper and lower covers.

7. The method for waterproofing junction boxes and modifying connectors according to claim 1, characterized in that, An annular groove is formed in the port of the lower cover, and a second sealing ring is placed in the annular groove. An annular end face is formed at the port of the upper cover. When the annular mating protrusion is aligned and pressed into the annular groove of the upper cover, the annular end face of the upper cover simultaneously presses against the annular groove of the lower cover. The upper cover and the lower cover are locked by fasteners, so that the annular end face squeezes the second sealing ring. The second sealing ring deforms and fills the gap between the annular end face and the annular groove of the lower cover.

8. The method for waterproofing junction boxes and modifying connectors according to claim 7, characterized in that, The annular grooves on the upper cover and the lower cover are opposite to each other and staggered.

9. The method for waterproofing junction boxes and modifying connectors according to claim 7, characterized in that, There is a depth difference between the annular groove on the upper cover and the annular groove on the lower cover.

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