A power jointing fitting with anti-loosening structure

Abstract

The application relates to the technical field of electric power joint fittings, and particularly discloses an electric power joint fitting with an anti-loosening structure, which comprises a grounding box, a fixing mechanism and a bending mechanism. The fixing mechanism comprises a fixing cylinder fixed on the grounding box, a locking assembly and a clamping assembly. The locking assembly comprises a locking cylinder, and the clamping assembly comprises a plurality of clamping pieces uniformly distributed on the inner wall of the locking cylinder. Limiting inclined grooves are arranged on the inner wall of the fixing cylinder and correspond to the positions of the clamping pieces. When a main cable descends, the limiting inclined grooves push the clamping pieces to slide so as to clamp the main cable. The bending mechanism comprises a rotating rod hinged on the fixing cylinder around a horizontal axis and a fixing ring arranged on the rotating rod. A stress block is arranged on the rotating rod, and an upper pushing block is arranged on the locking cylinder. When the locking cylinder descends, the upper pushing block pushes the stress block to drive the fixing ring to rotate and compress the main cable to bend. The application can avoid the loosening and falling-off of the cable and the joint fitting.

Description

Technical Field

[0001] This invention relates to the field of power connection fittings technology, and specifically to a power connection fitting with an anti-loosening structure. Background Technology

[0002] Power connection fittings are a type of key metal accessory used in power lines for connecting, extending, and repairing grounding wires. They are an important component of power fittings, primarily ensuring reliable connections in terms of mechanical strength and electrical continuity. During the construction and maintenance of grounding lines, due to repair and branch expansion needs, it is often necessary to connect main cables (thick copper cores) and connecting cables (thin copper cores) of different diameters. Such connections must balance mechanical robustness and electrical conductivity stability, resisting external forces to prevent loosening while minimizing contact resistance to ensure smooth discharge of grounding current and safeguard the function of the grounding system.

[0003] Currently, the splicing of coarse and fine copper cores often involves wrapping the fine copper core with multiple strands of coarse copper core. Specifically, the insulation layers at the corresponding ends of the coarse and fine copper cores are first peeled off. The fine copper core is then combed, twisted tightly, and the oxide layer is removed. At the same time, the ends of the multiple strands of coarse copper core are appropriately spread out and roughened to increase the contact area between the two. During splicing, the twisted fine copper core is placed in the center of the multiple strands of coarse copper core. Then, the spread-out strands of coarse copper core are evenly wrapped around the outer layer of the fine copper core, and each strand is gathered and compacted to form a tightly fitted covering structure, ensuring no gaps or looseness.

[0004] Existing power connection fittings are mostly as shown in Chinese patent document CN119009513B, which specifically discloses a high-voltage connection fitting for power lines, including a lower clamp and an upper clamp for clamping cables. Both the lower clamp and the upper clamp are arc-shaped structures, which are fastened together to clamp and fix the cables. The lower clamp and the upper clamp are connected and fastened together by a cable clamping installation mechanism.

[0005] The drawbacks of existing splicing fittings are as follows: In existing splicing fittings, the cable is fixed by the clamping of the lower clamp and the upper clamp, relying solely on friction to maintain stability. When wind or vibration causes the cable to sway, the resulting axial tension and radial oscillation are directly transmitted to the clamping point between the cable and the splicing fitting. This causes repeated changes and continuous friction at the clamping point, gradually increasing the gap and leading to axial movement and radial offset. Ultimately, this results in the cable loosening from the splicing fitting, and the cable falling out of the fitting. Although existing technologies also use a flexible upper and lower arc groove plate structure to clamp the cable, this structure will fatigue after prolonged use, causing the upper and lower arc groove plate structure to shrink and fatigue, thus failing to guarantee the clamping and fixing of the cable. Summary of the Invention

[0006] This invention provides a power connection fitting with an anti-loosening structure to solve the technical problem in the prior art where the connection fitting is prone to loosening between the cable and the fitting, and the cable may fall off.

[0007] A power connection fitting with an anti-loosening structure includes a grounding box, a fixing mechanism, and a bending mechanism. The bending mechanism is located at the bottom insertion end of the fixing mechanism through which the main cable passes. The fixing mechanism includes a fixing cylinder fixed to the grounding box, a locking assembly, and a clamping assembly. The locking assembly includes a locking cylinder that slides vertically through the fixing cylinder for the main cable to pass through. The clamping assembly includes multiple clamping members evenly distributed circumferentially on the inner wall of the locking cylinder. Each clamping member is radially slidably mounted on the locking cylinder. The inner wall of the fixing cylinder has limiting grooves corresponding to the positions of each clamping member. The limiting grooves are arranged from top to bottom and inclined towards the center of the fixing cylinder, so that the limiting grooves push against the main cable when it descends. Each clamping component slides to clamp the main cable; the bending mechanism includes a rotating rod hinged to a fixed cylinder about a horizontal axis and a fixed ring on the rotating rod. The fixed ring is located at the bottom of the locking cylinder and allows the main cable to pass through; a force-bearing block is provided on the rotating rod, and an upper pushing block is provided on the locking cylinder. When the locking cylinder descends, the upper pushing block pushes the force-bearing block to drive the fixed ring to rotate and compress the main cable to bend; the rotating rod is slidably mounted on the fixed cylinder in the vertical direction through a hinge shaft. The top of the force-bearing block is provided with a second inclined surface, which is arranged from bottom to top and inclined towards the center of the locking cylinder; after the upper pushing block pushes the rotating rod downward to its limit position, it drives the rotating rod to rotate by pushing the second inclined surface.

[0008] After the main cable is inserted into the fixing mechanism, the clamping components initially move away from each other under the push of the main cable, thus avoiding contact with it. Then, they pass between the clamping components. Once no longer applying force to the main cable, the main cable drives the clamping components downwards. Driven by the bottom of the limiting inclined groove, the clamping components move closer together, thus completing the clamping and fixing of the main cable. In other words, the locking assembly and clamping assembly together form a one-way locking structure that can clamp and fix the main cable. Furthermore, because the clamping assembly has multiple circumferentially distributed clamping components, it can apply a continuous and reliable clamping force to the main cable. If the main cable experiences a downward axial pull and moves downwards, the limiting inclined groove can further push the clamping components inwards, thereby increasing the clamping force and ensuring that the main cable cannot come out. Furthermore, when the locking cylinder moves downwards, it can drive the force-bearing block through the upper push block, thereby causing the rotating rod and the fixing ring to rotate. The main cable is bent to form a bent section, which is closely attached to the inner walls of the opposite sides of the fixing ring. During use, it can convert the axial tension and radial swing force of the main cable caused by wind or vibration into the squeezing force on the fixing ring, changing the direction of force transmission. By forming the bent section, the force is buffered and converted, thereby reducing or even preventing the transmission of wind or other forces on the main cable to the main cable and the fixing mechanism, and avoiding the situation of loosening between the cable and the connecting hardware or the cable falling off.

[0009] Preferably, the locking assembly further includes an elastic element connected between the fixed cylinder and the locking cylinder, the elastic element being used to apply a downward elastic force to the locking cylinder.

[0010] The elastic force allows the main cable to obtain sufficient clamping force when it is initially inserted, reducing the risk of loosening caused by untimely locking during the installation stage.

[0011] Preferably, the top of the locking cylinder is provided with an outward-facing annular flange, the top of the fixing cylinder is provided with an annular step located below the annular flange, and the elastic element is connected between the annular flange and the annular step.

[0012] Preferably, the side wall of the locking cylinder is provided with a locking hole located below the clamping member, and the locking assembly also includes a locking bolt threaded onto the fixed cylinder. The locking bolt is used to pass through the locking hole to prevent the locking cylinder from moving upward.

[0013] The locking hole and locking bolt form a secondary locking and protection structure. When the locking bolt is fully screwed into the locking hole, it can form a mechanical limit, effectively preventing the locking cylinder from moving upward. During long-term use, the mechanical limit can also firmly restrict the position of the locking cylinder, preventing it from accidentally moving upward and causing the clamping components to loosen, thus improving the overall structural reliability of the device.

[0014] Preferably, the locking cylinder has a first inclined surface located below and connected to the locking hole. The first inclined surface slopes upward and toward the center of the locking cylinder. The locking bolt is used to press against the first inclined surface and push the locking cylinder downward.

[0015] When the locking bolt is pressed against the first inclined surface, as the locking bolt is further screwed in, it can drive the locking cylinder to move downward. After the locking cylinder moves downward, the limiting inclined groove can further drive the clamping part to move inward, increasing the clamping force. Moreover, after the locking cylinder moves downward, it can drive the bending mechanism to bend. At this time, the main cable is taut between the clamping part and the bending mechanism, thus ensuring that the main cable can be reliably attached to the fixing ring.

[0016] Preferably, the diameter of the locking hole in the vertical direction is larger than the outer diameter of the locking bolt.

[0017] The locking hole is larger than the outer diameter of the locking bolt, and the reserved gap can also accommodate the clamping requirements of cables of different specifications. Even if the main cable is subjected to axial tension during later use, the main cable can move downwards slightly with the clamping parts, thereby further clamping the main cable.

[0018] Preferably, the clamping element is a roller, which has an outer circumferential surface for clamping the main cable and is capable of rotating about its own axis.

[0019] The roller structure converts the sliding friction during cable installation and adjustment into rolling friction, significantly reducing the resistance when the cable is inserted, reducing the force required for installation, and improving ease of installation. Simultaneously, rolling friction reduces wear on the main cable, preventing a decrease in electrical performance due to cable compression and deformation. The roller's larger outer circumference also improves clamping stability without damaging the main cable, preventing deformation of the thick copper core due to excessive clamping force.

[0020] Preferably, the locking cylinder is also provided with a lower push block, and the upper push block and the lower push block are respectively placed on the upper and lower sides of the force-bearing block.

[0021] Preferably, the grounding box also includes a clamp for holding the splicing cable.

[0022] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0023] After the main cable is inserted into the fixing mechanism, the clamping components initially move away from each other under the push of the main cable, thus avoiding contact with it. Then, they pass between the clamping components. Once no longer applying force to the main cable, the main cable drives the clamping components downwards. Driven by the bottom of the limiting inclined groove, the clamping components move closer together, thus completing the clamping and fixing of the main cable. In other words, the locking assembly and clamping assembly together form a one-way locking structure that can clamp and fix the main cable. Furthermore, because the clamping assembly has multiple circumferentially distributed clamping components, it can apply a continuous and reliable clamping force to the main cable. If the main cable experiences a downward axial pull and moves downwards, the limiting inclined groove can further push the clamping components inwards, thereby increasing the clamping force and ensuring that the main cable cannot come out. Furthermore, when the locking cylinder moves downwards, it can drive the force-bearing block through the upper push block, thereby causing the rotating rod and the fixing ring to rotate. The main cable is bent to form a bent section, which is closely attached to the inner walls of the opposite sides of the fixing ring. During use, it can convert the axial tension and radial swing force of the main cable caused by wind or vibration into the squeezing force on the fixing ring, changing the direction of force transmission. By forming the bent section, the force is buffered and converted, thereby reducing or even preventing the transmission of wind or other forces on the main cable to the main cable and the fixing mechanism, and avoiding the situation of loosening between the cable and the connecting hardware or the cable falling off. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall assembly of the present invention.

[0025] Figure 2 An enlarged view showing the connection relationship between the fixing mechanism, bending mechanism and main cable of the present invention.

[0026] Figure 3 This is a schematic diagram of the fixing mechanism of the present invention.

[0027] Figure 4 This is a cross-sectional view of the fixing mechanism and bending mechanism of the present invention.

[0028] Figure 5 for Figure 4 Enlarged diagram of point B in the middle.

[0029] Figure 6 This is a schematic diagram of the overall structure of the locking component of the present invention.

[0030] Figure 7 This is a cross-sectional view of the locking component and the fixing cylinder of the present invention after assembly.

[0031] Figure 8 This is a schematic diagram showing the connection structure between the bending mechanism and the fixed cylinder of the present invention.

[0032] Figure 9 for Figure 8 Enlarged diagram of point A in the middle.

[0033] Figure label:

[0034] 1. Fixing mechanism; 11. Fixing cylinder; 111. Limiting groove; 112. Guide groove; 113. Annular step; 114. Threaded through hole; 115. Sliding groove; 116. Stop groove wall; 12. Locking assembly; 121. Locking cylinder; 122. Upper push block; 123. Lower push block; 124. Elastic element; 125. Locking hole; 126. Locking bolt; 127. First inclined surface; 128. Mounting hole; 129. Annular flange; 13. Clamping assembly; 131. Clamping element; 2. Bending mechanism; 21. Rotating rod; 22. Fixing ring; 23. Force-bearing block; 231. Second inclined surface; 3. Box body; 31. Support plate; 32. Wire clamp. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] To address the problem of cables easily detaching when fixed to splicing fittings using only friction in existing technologies, this invention utilizes a wedge clamping method to hold and fix the main cable. Simultaneously, a bending mechanism bends the main cable to form a bent section. This bent section reduces or even eliminates the transmission of external forces on the main cable to the connection between the main cable and the fixing mechanism, thereby preventing the cable from loosening or detaching from the splicing fittings.

[0037] like Figures 1-9As shown, an electrical connection fitting with an anti-loosening structure according to the present invention includes a grounding box, a voltage protector fixed in the grounding box, a wire clamp, a fixing mechanism 1, and a bending mechanism 2, wherein the bending mechanism 2 is movably mounted on the fixing mechanism 1.

[0038] The grounding box includes a box body 3 and a support plate 31. Multiple support plates 31 are fixedly installed inside the box body 3. Multiple fixing mechanisms 1, multiple wire clamps 32, and multiple voltage protectors are fixedly installed on the multiple support plates 31 respectively. The fixing mechanism 1 is located at the bottom of the box body 3, the wire clamp 32 is located above the fixing mechanism 1, and the voltage protector is located above the wire clamp 32 and is connected to the wire clamp 32 through a copper busbar.

[0039] In this embodiment, the main cable is thicker and enters the grounding box from below, while the connecting cable is thinner and fixedly installed on the clamp 32. Specifically, the end of the main cable has multiple sets of exposed thick copper cores, which are connected to the thin copper cores of the connecting cable. The main cable is inserted into the grounding box, passes through the bending mechanism 2, and then the thick copper cores at the end of the main cable are inserted into the fixing mechanism 1 for fixation, while the thin copper cores are led out from the fixing mechanism 1, thus completing the clamping of the main cable. Since the connecting cable is fixed on the clamp, and the clamp is connected to the voltage protector through a copper busbar, a circuit is formed between the main cable, the clamp, and the voltage protector.

[0040] The fixing mechanism 1 includes a fixing cylinder 11, a locking component 12, and a clamping component 13. The locking component 12 is slidably mounted on the fixing cylinder 11, and the clamping component 13 is mounted on the locking component 12.

[0041] The fixed cylinder 11 is fixedly installed on the support plate inside the box. For ease of description, the fixed cylinder 11 is defined as extending vertically, and the main cable passes through the fixed cylinder 11 from bottom to top, so that the bottom of the fixed cylinder 11 forms a bottom insertion end for the main cable to pass through.

[0042] The inner top of the fixed cylinder 11 has an upward-facing annular step 113; the inner wall of the fixed cylinder 11 has multiple limiting grooves 111, wherein the limiting grooves 111 are located below the annular step 113, and the multiple limiting grooves 111 are evenly distributed around the circumference of the fixed cylinder 11. The bottom of the limiting grooves 111 is inclined from top to bottom and toward the axis of the fixed cylinder 11.

[0043] A threaded through hole 114 communicating with the inside and outside of the fixed cylinder 11 is provided on one side wall of the fixed cylinder 11; a vertically extending groove 115 is provided on the other side wall of the fixed cylinder 11, the bottom of which extends to the bottom surface of the fixed cylinder 11. Only the lower half of the groove 115 horizontally penetrates the side wall of the fixed cylinder 11, so that the top outer side of the groove 115 has a stop groove wall 116. The threaded through hole 114 and the groove 115 are distributed on opposite sides of the fixed cylinder 11. Vertically extending guide grooves 112 are provided on the two groove walls along the circumference of the fixed cylinder 11 in the groove 115, but the guide grooves 112 do not extend to the bottom surface of the fixed cylinder 11.

[0044] The locking assembly 12 includes a locking cylinder 121, an elastic element 124, a locking bolt 126, an upper push block 122, and a lower push block 123. The locking cylinder 121 is located inside the fixed cylinder 11 and can slide up and down relative to the fixed cylinder 11. The elastic element 124 is connected between the locking cylinder 121 and the fixed cylinder 11. Here, the elastic element 124 is a tension spring. The locking bolt 126 is threaded into the threaded through hole 114 of the fixed cylinder 11.

[0045] Specifically, the top of the locking cylinder is provided with an outward annular flange 129, which is located directly above the annular step 113 in the fixed cylinder 11. The upper end of the elastic element 124 is connected to the annular flange 129 and the lower end is connected to the annular step 113, applying a downward elastic force to the locking cylinder 121.

[0046] The locking cylinder 121 is provided with mounting holes 128, locking holes 125 and a first inclined surface 127 from top to bottom; there are multiple mounting holes 128, which are evenly distributed along the circumference of the locking cylinder 121, and each mounting hole 128 corresponds to a limit groove 111. After the locking cylinder 121 is installed into the fixing cylinder 11, the mounting holes 128 are connected to the limit grooves 111.

[0047] The mounting hole 128 extends radially through the inner wall of the locking cylinder 121, and the end of the mounting hole 128 facing the central axis of the locking cylinder 121 has a constricted opening structure.

[0048] The locking hole 125 is located below the mounting hole 128. There is only one locking hole 125, and its diameter in the vertical direction is larger than the outer diameter of the shank of the locking bolt 126. The locking hole 125 on the locking sleeve 121 and the threaded through hole 114 on the fixing sleeve 11 are located at the same position in the circumferential direction. The diameter of the locking hole 125 in the vertical direction is larger than the outer diameter of the shank of the locking bolt 126, allowing it to be adapted to various types of main cables.

[0049] The first inclined surface 127 is located below and communicates with the locking hole 125, meaning that the upper part of the first inclined surface 127 is close to the lower end opening of the locking hole 125. The first inclined surface 127 and the locking hole 125 are located at the same circumferential position, and the first inclined surface 127 slopes upwards towards the central axis of the locking cylinder 121. When the locking cylinder 121 and the fixing cylinder 11 are assembled together, the first inclined surface 127, the locking hole 125, and the threaded through hole 114 on the fixing cylinder 11 are located at the same circumferential position.

[0050] The locking bolt 126 passes through the threaded hole 114 from the outside of the fixing cylinder 11, and is threadedly connected to the threaded hole 114. When the locking bolt 126 presses against the first inclined surface 127, as the locking bolt 126 continues to screw in, it pushes the locking cylinder 121 downward through the first inclined surface 127, eventually aligning the locking bolt 126 with the locking hole 125 and inserting it into the locking hole 125. Once the locking bolt 126 is inserted into the locking hole 125, even if the main cable is subjected to an upward force during use, the main cable cannot drive the locking cylinder 121 to move upward due to the mutual obstruction between the locking bolt 126 and the locking hole 125.

[0051] The upper push block 122 and the lower push block 123 are both protruding and fixed on one side of the locking cylinder 121. Specifically, when the locking cylinder 121 and the fixing cylinder 11 are assembled together, the upper push block 122 and the lower push block 123 are directly opposite the sliding groove 115 on the fixing cylinder 11.

[0052] The clamping assembly 13 includes multiple clamping elements 131, each corresponding to a mounting hole 128 on the locking cylinder 121. Each clamping element 131 passes through the outer opening of the mounting hole 128. Specifically, the clamping element 131 is a roller. After being inserted into the mounting hole 128, the roller can rotate around its own axis. The outer diameter of the roller is smaller than the diameter of the inner opening of the mounting hole 128, and one of its outer peripheral surfaces can extend into the locking cylinder 121. Because the inner opening of the mounting hole 128 has a constricted structure, the roller cannot be dislodged from the mounting hole 128. In use, the outer peripheral surfaces of multiple rollers can clamp the main cable together. Since the roller can rotate around its own axis, when the locking cylinder 121 moves up and down after contacting the main cable, the roller can rotate, converting the sliding friction between the roller and the locking cylinder 121 into rolling friction, reducing the force required to insert the main cable, and also reducing the friction on the main cable.

[0053] After assembling the locking cylinder 121 and the fixing cylinder 11, the inner side of the roller extends into the interior of the locking cylinder 121, and the outer side is located in the limiting groove 111. At this time, if the locking cylinder 121 moves upward, the locking cylinder 121 will drive the roller to move upward together. The limiting groove 111 provides space for the roller to move outward, so that the roller can move outward and thus avoid the main cable. After each roller clamps the main cable, as the locking bolt 126 drives the locking cylinder 121 to move downward through the first inclined surface 127, the locking cylinder 121 moves downward together with the roller. Under the action of the limiting groove 111, the roller moves towards the central axis of the locking cylinder 121, and each roller clamps the main cable together until the locking bolt 126 passes into the locking hole 125.

[0054] By setting the elastic element 124, a downward elastic force can be applied to the locking cylinder 121. After the main cable passes upward to the outer peripheral surface and contacts each clamping member 131, the main cable is no longer driven. Under the action of gravity and the elastic element 124, the main cable simultaneously drives the locking cylinder 121 to move downward. The limiting inclined groove 111 pushes the clamping members 131 inward to move closer to each other, thereby realizing clamping and fixing.

[0055] The bending mechanism 2 includes a rotating rod 21, a fixed ring 22, and a force-bearing block 23. The fixed ring 22 is installed at the bottom of the rotating rod 21, and the force-bearing block 23 is fixed at the top of the rotating rod 21 and located between the upper push block 122 and the lower push block 123.

[0056] Specifically, the top of the rotating rod 21 passes through the slide groove 115 of the fixed cylinder 11, and both ends of the rotating rod 21 are rotatably mounted in the slide groove 115 via pins (not shown in the figure). Specifically, the end of the pin extends into the guide groove 112, and the pin can slide up and down in the guide groove 112 and can also rotate in the guide groove 112. The bottom of the rotating rod 21 extends to the bottom of the fixed mechanism 1.

[0057] The force-bearing block 23 extends inward between the upper push block 122 and the lower push block 123. The top of the force-bearing block 23 is provided with a second inclined surface 231 that extends upward and approaches the axis of the locking cylinder 121. When the upper push block 122 pushes the force-bearing block 23 downward, it can first push the force-bearing block 23 and the rotating rod 21 downward. When the pin on the rotating rod 21 moves to the bottom of the guide groove 112, the upper push block 122 can press against the second inclined surface 231 of the force-bearing block 23, driving the force-bearing block 23 and the rotating rod 21 to rotate. It should be noted that when the pin on the rotating rod 21 moves to the bottom of the guide groove 112, the force-bearing block 23 does not move down to the lower push block 123, that is, the force-bearing block 23 and the lower push block 123 do not contact each other, thus leaving space for the rotation of the force-bearing block 23.

[0058] The retaining ring 22 is fixedly installed at the bottom of the rotating rod 21. When the main cable is not clamped, the retaining ring 22 is located below the retaining cylinder 11 and is arranged coaxially with the retaining cylinder 11. The main cable passes through the middle of the retaining ring 22. When the rotating rod 21 rotates, the retaining ring 22 rotates with the rotating rod 21, forcibly bending the main cable passing through the retaining ring 22.

[0059] Working principle:

[0060] The installation of grounding lines consists of four steps: 1. Installation preparation, 2. Initial fixing, 3. Locking and reinforcement, and 4. Bending to prevent loosening. The bending and locking reinforcement are carried out simultaneously.

[0061] Installation preparation: Remove the insulation and filler layers from the ends of the main cable and splice cable to expose the thick copper core and the thin copper core, and then splice the thick copper core to the thin copper core. After splicing, the installation preparation is complete.

[0062] Preliminary fixing: Pass the completed installation preparation splice cable and main cable through the through hole on the grounding box in sequence. Pass the main cable through the fixing ring 22 of the bending mechanism 2 and the locking cylinder 121 of the fixing mechanism 1 in sequence. Connect the splice cable passing through the locking cylinder 121 to the clamp to complete the preliminary connection of the grounding line.

[0063] Specifically, the main cable first passes through the fixing ring 22 of the bending mechanism 2 and enters the locking cylinder 121, which is slidably connected to the fixing cylinder 11. Initially, the locking cylinder 121 moves downwards under the action of the elastic element 124, and the clamping member 131 is pushed to a relatively close position by the limiting groove 111. When the main cable passes upwards, the end of the main cable overcomes the elastic force of the elastic element 124, pushing the clamping member 131 upwards along the limiting groove 111 and sliding away from the axis of the locking cylinder 121. The push block 123 slides synchronously with the locking cylinder 121 until it contacts the force-bearing block 23 and drives the rotating rod 21 to slide synchronously upward along the guide groove 112. The rotating rod 21 gradually enters the sliding groove 115 and fits against the stop groove wall 116. Due to the obstruction of the stop groove wall 116, the rotating rod 21 always remains in a vertical state and cannot rotate. As the clamping parts continue to move upward, the clamping parts 131 move away from each other, and the end of the main cable passes over each clamping part 131. The outer circumference of the main cable contacts each clamping part 131. Afterwards, no further upward force is applied to the main cable. The elastic element 124 contracts, causing the locking cylinder 121 to slide downwards and simultaneously causing the clamping element 131 to slide downwards along the limiting groove 111. Under the push of the limiting groove 111, each clamping element 131 moves closer to each other and cooperates to clamp the main cable. The upper push block 122 and the lower push block 123 slide downwards synchronously with the locking cylinder 121, so that the upper push block 122 is closer to the force-bearing block 23 and the lower push block 123 is farther away from the force-bearing block 23. The clamping force of the outer peripheral surface of the clamping assembly 13 on the coarse copper core through the limiting groove 111 gradually increases as the locking cylinder 121 slides down. When the elastic force of the elastic element 124 and the clamping force of the clamping assembly 13 reach equilibrium, the locking cylinder 121 stops sliding and completes the one-way locking of the main cable.

[0064] Subsequently, the locking bolt 126 is rotated in the direction of the locking cylinder 121. The locking bolt 126 pushes the locking cylinder 121 further downward by abutting against the first inclined surface 127. The clamping member 131 slides along the axis of the locking cylinder 121 along the limiting inclined groove 111, further increasing the clamping force. The upper push block 122 slides with the locking cylinder 121 until it abuts against the second inclined surface 231 of the force-bearing block 23, thereby pushing the rotating rod 21 downward along the guide groove 112. As the locking cylinder 121 continues to slide, the pin of the rotating rod 21 slides to the bottom of the guide groove 112. At this point, the upper end of the rotating rod 21 slides out of the groove 115 and the top of the rotating rod 21 is no longer in contact with the stop groove wall 116; the upper push block 122 presses against the second inclined surface 231, forcing the rotating rod 21 to rotate clockwise and drive the fixing ring 22 to rotate synchronously. The fixing ring 22 compresses the main cable to form a bend with a certain arc, and the main cable's own weight, the receiving hole of the box 3 and the fixing ring 22 together ensure the main cable's tight state; the upper push block 122 is completely in contact with the second inclined surface 231, the locking bolt 126 stops feeding, and the connection of the entire device is completed.

[0065] In this embodiment, after the main cable is inserted into the fixing mechanism, the limiting groove and the clamping member jointly lock the main cable in one direction. The greater the axial tension on the main cable, the greater the clamping force it experiences, thereby preventing the main cable from shaking and separating from the connecting hardware. Compared with the prior art where the main cable is fixed solely by the friction of the connecting hardware, this embodiment uses the limiting groove for clamping, resulting in better clamping performance. The bending mechanism can bend the main cable, forming a bent section that fits tightly against the inner wall of the fixing ring. When the main cable is subjected to wind or other forces, the axial tension and radial oscillation force can be converted into a compressive force on the fixing ring, reducing the force transmitted between the main cable and the clamping member. The kinetic energy of the main cable is dissipated by the elastic deformation and friction of the bent section itself.

[0066] In this embodiment, the clamping member 131 is a roller, which clamps the main cable using its outer peripheral surface. In other embodiments, the clamping member 131 can be a ball bearing or a square block with an arc-shaped surface on its inner side for conforming to the main cable. In other embodiments, the number of clamping members 131 can be increased or decreased according to actual needs, with the principle of ensuring reliable clamping and fixing of the main cable without damaging it.

[0067] In this embodiment, the bottom surface of the upper push block 122 is a plane, and the top of the force-receiving block 23 has a second inclined surface 231. The upper push block 122 first pushes the force-receiving block 23 downward, and then pushes the second inclined surface 231 of the force-receiving block 23 to drive the force-receiving block 23 to rotate. In other embodiments, the second inclined surface 231 on the force-receiving block 23 can be omitted, and the bottom of the upper push block 122 can be set as a cone, relying on the cone-shaped upper push block 122 to push the force-receiving block 23.

[0068] In this embodiment, the elastic element 124 is a tension spring. In other embodiments, the elastic element 124 can be other workpieces with elastic force, such as a spring sheet, etc., and the locking cylinder 121 and the clamping member 131 can achieve unidirectional locking of the main cable by relying on the elastic force.

[0069] In other embodiments, the locking bolt 126 can be a sliding limit post, and its end face has a structure that can abut against the first inclined surface 127, forcing the locking cylinder 121 to slide downward, so as to further lock the clamping member 131.

[0070] In other embodiments, the diameter of the locking hole 125 may be equal to the outer diameter of the shank of the locking bolt 126.

[0071] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A power connection fitting with an anti-loosening structure, comprising a grounding box, characterized in that, It also includes a fixing mechanism and a bending mechanism. The bending mechanism is located at the bottom insertion end of the fixing mechanism through which the main cable passes. The fixing mechanism includes a fixing cylinder fixed to the grounding box, a locking assembly, and a clamping assembly. The locking assembly includes a locking cylinder that slides vertically through the fixing cylinder for the main cable to pass through. The clamping assembly includes multiple clamping members evenly distributed circumferentially in the inner wall of the locking cylinder. Each clamping member is radially slidably assembled on the locking cylinder. The inner wall of the fixing cylinder is provided with limiting grooves corresponding to the positions of each clamping member. The limiting grooves are arranged from top to bottom and inclined towards the center of the fixing cylinder, so that when the main cable descends, the limiting grooves push the clamping members to slide and cooperate to clamp the main cable. The cable bending mechanism includes a rotating rod hinged to a fixed cylinder about a horizontal axis and a fixed ring on the rotating rod. The fixed ring is located at the bottom of the locking cylinder and allows the main cable to pass through. A force-bearing block is provided on the rotating rod, and an upper push block is provided on the locking cylinder. When the locking cylinder descends, the upper push block pushes the force-bearing block to drive the fixed ring to rotate and compress the main cable to bend. The rotating rod is slidably mounted on the fixed cylinder in the vertical direction via a hinge shaft. A second inclined surface is provided on the top of the force-bearing block. The second inclined surface is arranged from bottom to top and inclined towards the center of the locking cylinder. After the upper push block pushes the rotating rod downward to its limit position, it drives the rotating rod to rotate by pushing the second inclined surface. The locking cylinder has a locking hole located below the clamping member on its side wall. The locking assembly also includes a locking bolt threaded onto the fixed cylinder. The locking bolt is used to pass through the locking hole to prevent the locking cylinder from moving upward. The locking cylinder has a first inclined surface located below and connected to the locking hole. The first inclined surface slopes upward and toward the center of the locking cylinder. The locking bolt is used to press against the first inclined surface and push the locking cylinder downward.

2. The power connection fitting with an anti-loosening structure according to claim 1, characterized in that, The locking assembly also includes an elastic element connected between the fixed cylinder and the locking cylinder, which is used to apply a downward elastic force to the locking cylinder.

3. The power connection fitting with an anti-loosening structure according to claim 2, characterized in that, The top of the locking cylinder has an outward-facing annular flange, and the top of the fixing cylinder has an annular step located below the annular flange. The elastic element is connected between the annular flange and the annular step.

4. The power connection fitting with an anti-loosening structure according to claim 1, characterized in that, The diameter of the locking hole in the vertical direction is larger than the outer diameter of the locking bolt.

5. The power connection fitting with an anti-loosening structure according to any one of claims 1-4, characterized in that, The clamping element is a roller, which has an outer circumferential surface for clamping the main cable and is capable of rotating about its own axis.

6. The power connection fitting with an anti-loosening structure according to any one of claims 1-4, characterized in that, The locking cylinder is also equipped with a lower push block, and the upper push block and the lower push block are respectively placed on the upper and lower sides of the force-bearing block.

7. The power connection fitting with an anti-loosening structure according to any one of claims 1-4, characterized in that, The grounding box also includes wire clamps for holding the splicing cables.

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