A power line laying tension adjusting device

Abstract

This invention relates to the field of power technology, specifically to a tension adjustment device for power line laying. It includes two U-shaped screws fitted onto a steel-cored aluminum stranded wire, with pressure blocks fitted on the U-shaped screws. Both ends of the U-shaped screws are threaded with a first nut. The steel-cored aluminum stranded wire forms a bend between the two U-shaped screws. An intermediate ring is provided between the two U-shaped screws, with multiple equidistant vent holes on its outer surface. Buffer components are provided on both sides of the intermediate ring, and each buffer component is connected to one of the two U-shaped screws. Using this power line laying tension adjustment device, real-time flexible tension adjustment can be achieved, ensuring that the tension on the steel-cored aluminum stranded wire remains within a safe tolerance range, preventing problems such as conductor loosening, aluminum wire breakage, and steel core breakage caused by continuously increasing tension during laying.

Description

Technical Field

[0001] This invention relates to the field of power technology, specifically to a tension adjustment device for power line laying. Background Technology

[0002] Steel-cored aluminum stranded wire is a widely used core conductor in overhead transmission lines. It is made of galvanized steel core and outer aluminum wire stranded together. Combining the high mechanical strength of galvanized steel core and the excellent conductivity of aluminum wire, it can withstand the external tension and environmental load during overhead laying, and can also achieve efficient power transmission. With its many advantages such as simple structure, convenient construction, economical laying cost, and large power transmission capacity, it is widely used in the construction of transmission and distribution lines of different voltage levels and is a commonly used conductor type in the field of power transmission.

[0003] In the actual construction of steel-cored aluminum stranded wire, the winch traction method is commonly used. The winch pulls one end of the conductor to achieve the overall movement and deployment, completing the core process of overhead laying. During construction, the steel-cored aluminum stranded wire is easily subject to resistance due to changes in the route, external obstacles, and unevenness of the laying surface. Since the winch's traction action is continuous, the tension on the conductor increases with the resistance. When the tension exceeds the tolerance limit of the steel-cored aluminum stranded wire, it can easily cause damage such as loosening of the conductor strands, breakage of the aluminum wire, or even breakage of the steel core. This not only results in material loss but also interrupts the laying process, increasing rework costs. Furthermore, if the damaged conductor is put into use, it poses a safety hazard to power transmission. To prevent these situations, tension wheels and other adjustment measures are installed in the steel-cored aluminum stranded wire. However, these measures cannot provide feedback on the increased tension of the steel-cored aluminum stranded wire, and continuous traction still results in damage. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a power line laying tension adjustment device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tension adjustment device for power line laying, comprising two U-shaped screws, each sleeved on a steel-cored aluminum stranded wire. Each U-shaped screw has a pressure block fitted on it. Both ends of each U-shaped screw are threaded with a first nut. The steel-cored aluminum stranded wire forms a curved section between the two U-shaped screws. An intermediate ring is provided between the two U-shaped screws. The outer surface of the intermediate ring has multiple equidistant vent holes in a ring shape. Buffer members are provided on both sides of the intermediate ring and are inserted into it. Two buffer members are respectively connected to the two U-shaped screws. By setting two U-shaped screws with pressure blocks and first nuts on the steel-cored aluminum stranded wire, a curved section is formed in the wire. Combined with the intermediate ring and the buffer members inserted on both sides, this provides the basic structural support for tension adjustment. The U-shaped screw, pressure block, and first nut work together to quickly and securely clamp the device onto the aluminum steel-cored stranded wire without requiring cutting or welding. This makes assembly and disassembly convenient and does not damage the wire. The bent section disperses traction force through expansion deformation, preventing force concentration and initially reducing the load on the aluminum steel-cored stranded wire. The vent in the middle ring allows air circulation between the device and the outside, preventing internal air pressure changes from affecting the operation of the buffer components. The cooperation between the side buffer components, the U-shaped screw, and the middle ring provides a structural foundation for subsequent elastic buffering and overload protection, achieving overall tension control of the aluminum steel-cored stranded wire and preventing excessive tension caused by continuous winch traction.

[0006] Specifically, the buffer includes a cylindrical body, with cylindrical bodies on both sides of the intermediate ring. The cylindrical bodies are connected to the intermediate ring via a plug-in assembly. An end cap is installed at the end of the cylindrical body away from the intermediate ring. A guide hole is provided in the middle of one side of the end cap, and a guide rod is inserted into the guide hole. The end of the guide rod on the outside of the cylindrical body is connected to a U-shaped screw via a connecting assembly. A disc is installed at the end of the guide rod inside the cylindrical body. The disc is slidably installed inside the cylindrical body. A first compression spring is provided between the disc and the end cap, and the first compression spring is sleeved on the guide rod. The cylinder body and the intermediate ring are inserted together to provide stable support for the buffer component. The guide rod has a rectangular cross-section, and the guide hole has a rectangular cross-section. The precise fit between the guide rod and the guide hole restricts the guide rod to only perform linear reciprocating motion, avoiding skewing or jamming during the buffering process and ensuring smooth sliding of the disc body. The disc body cooperates with the first compression spring. When the steel-cored aluminum stranded wire encounters resistance and the tension increases, the traction force pushes the guide rod to drive the disc body to compress the first compression spring. The elastic deformation of the first compression spring absorbs the excess tension, realizing real-time flexible adjustment of tension. This ensures that the tension on the steel-cored aluminum stranded wire is always within a safe tolerance range, fundamentally preventing damage problems such as loosening of the steel-cored aluminum stranded wire, aluminum wire breakage, and steel core breakage.

[0007] Specifically, the plug-in assembly includes plug-in plates. Multiple plug-in plates are installed on two parallel sides of the intermediate ring in a ring-shaped, equidistant arrangement. A snap-fit ​​part is installed at the end of the plug-in plate away from the intermediate ring. Multiple plug-in slots are provided in a ring-shaped, equidistant arrangement on the side of the cylinder near the intermediate ring. The plug-in plates are inserted into the plug-in slots. Multiple snap-fit ​​holes are provided in a ring-shaped, equidistant arrangement on the outer surface of the cylinder. The snap-fit ​​holes communicate with the plug-in slots. The snap-fit ​​parts are inserted into the snap-fit ​​holes. Multiple pressing mechanisms for disengaging the snap-fit ​​parts from the snap-fit ​​holes are installed in a ring-shaped, equidistant arrangement on the outer surface of the cylinder. In the initial state, the disc is positioned between the multiple plug-in plates and slides in contact with the plug-in plates. The precise fit between the plug plate and the plug slot, and between the snap-fit ​​part and the snap-fit ​​hole, ensures reliable snap-fit ​​and limiting of the intermediate ring and the cylinder, guaranteeing structural stability during normal buffering. The extrusion mechanism provides the power basis for the snap-fit ​​part to disengage. In the initial state, the disc slides against the arc surface of the plug plate, ensuring normal movement of the disc while limiting the plug plate and preventing the snap-fit ​​part from disengaging under non-overload conditions. When the tension exceeds the buffer range, the disc separates from the plug plate, releasing the limit and creating conditions for the extrusion mechanism to trigger overload relief, avoiding excessive compression failure of the first compression spring, and further preventing the steel-cored aluminum stranded wire from being subjected to excessive force.

[0008] Specifically, the extrusion mechanism includes a straight cylinder with multiple equidistant annular shaft holes on its outer surface. These shaft holes communicate with insertion slots. A straight cylinder, concentrically arranged with the shaft holes, is located outside each shaft hole. One end of the straight cylinder is fixedly connected to the cylinder body. An extrusion rod is located inside the straight cylinder near the shaft holes, with one end penetrating the shaft hole and contacting the insertion plate. A limiting plate is installed at the end of the extrusion rod away from the insertion plate, and this limiting plate is slidably installed inside the straight cylinder. The end of the straight cylinder away from the shaft holes is closed. A second compression spring is located on the side of the limiting plate opposite to the extrusion rod, and this second compression spring is located inside the straight cylinder. The straight cylinder provides installation and operating space for the extrusion rod, limiting plate, and second compression spring, ensuring stable transmission of the extrusion mechanism. The cooperation between the extrusion rod and the limiting plate transmits the elastic force of the second compression spring to the insertion plate, achieving reliable disengagement of the locking part from the locking hole and completing overload relief. The second compression spring provides continuous elastic driving force to the extrusion mechanism, ensuring rapid triggering of the relief action during overload.

[0009] Specifically, a threaded head is threadedly connected to the side of the straight cylinder away from the shaft hole. The center of the threaded head, facing away from the limiting plate, is recessed to form an internal hexagonal hole for engaging an internal hexagonal wrench. A second compression spring is provided between the threaded head and the limiting plate. By providing a threaded head with an internal hexagonal hole inside the straight cylinder, the overload threshold can be flexibly adjusted, improving the versatility of the device. The threaded connection between the threaded head and the straight cylinder allows adjustment of its position within the straight cylinder by turning an internal hexagonal wrench, thereby changing the preload force of the second compression spring. The adjustment of the preload force directly affects the force exerted by the compression rod on the plug-in plate, thus flexibly setting the overload tension threshold for the engaging part to disengage from the engaging hole. This allows for adaptation to different wire diameters and different tensile strengths of steel-cored aluminum stranded wires, meeting the tension adjustment needs of laying multi-specification conductors without the need for customized special devices, reducing construction equipment costs.

[0010] Specifically, the plug-in plate and the intermediate ring are integrally formed, and the snap-fit ​​part and the plug-in plate are integrally formed. The side of the plug-in plate facing the disk body is machined with an arc-shaped surface, and the annular side of the disk body fits into the arc-shaped surface. The integral forming of the plug-in plate and the intermediate ring, and the integral forming of the snap-fit ​​part and the plug-in plate, improves the structural strength.

[0011] Specifically, the connecting assembly includes a connecting plate. The connecting plate is mounted on the end of the guide rod furthest from the disc. Two circular holes are formed on one side of the connecting plate. The two ends of the U-shaped screw pass through the two circular holes respectively. A second nut is provided on both sides of each circular hole, and the second nut is threadedly connected to the U-shaped screw. The connecting plate provides a reliable connection between the guide rod and the U-shaped screw, ensuring that the traction force on the steel-cored aluminum stranded wire is stably transmitted to the buffer, guaranteeing that the buffer responds promptly to changes in tension. The U-shaped screw passes through the circular holes in the connecting plate, and with the second nuts on both sides of the holes, the position of the connecting plate on the U-shaped screw can be finely adjusted, thereby adjusting the relative position of the buffer and the steel-cored aluminum stranded wire, ensuring uniform force distribution after assembly.

[0012] Specifically, the guide rod has a rectangular cross-section, and the guide hole has a rectangular cross-section. Designing both the guide rod and guide hole with rectangular cross-sections further improves the operating accuracy and stability of the buffer component. The rectangular cross-sections prevent circumferential rotation of the guide rod within the guide hole, avoiding disc skewing due to rotation. Simultaneously, it prevents the guide rod rotation from causing the connecting plate to shift, ensuring the perpendicularity of the connection between the buffer component and the U-shaped screw. This ensures that the traction force is transmitted to the buffer component in a straight line, preventing localized stress concentration caused by force deviation, which could damage device components or affect the tension adjustment effect.

[0013] Specifically, a connecting ring is installed at the end of the cylinder furthest from the intermediate ring, and the connecting ring is connected to the end cap by multiple sets of bolts. The fixed connection between the connecting ring and the cylinder increases the contact area between the cylinder and the end cap. Combined with the multiple sets of bolts, the connection between the end cap and the cylinder is more secure and can withstand repeated impacts during the buffering process, preventing the end cap from falling off. The bolt connection method allows the end cap to be quickly disassembled and installed. When components such as the first compression spring, disc, and guide rod inside the device experience wear or failure, the end cap can be quickly opened for inspection and replacement without disassembling the entire device, reducing the difficulty and cost of later maintenance.

[0014] The beneficial effects of this invention are as follows: The core elastic buffer structure is formed by the first compression spring, guide rod, and disc. When the steel-cored aluminum stranded wire encounters resistance and the tension increases, the traction force will push the guide rod to drive the disc to compress the first compression spring. The elastic deformation of the first compression spring absorbs the excess tension, realizing real-time flexible adjustment of tension. This ensures that the tension on the steel-cored aluminum stranded wire is always within a safe tolerance range, preventing problems such as wire loosening, aluminum wire breakage, and steel core breakage caused by the continuous increase of tension during laying. The steel-cored aluminum stranded wire forms a bend between the two U-shaped screws. During laying, the unfolding of the bend can further disperse the traction force, avoiding the concentration of tension in a certain part of the steel-cored aluminum stranded wire. At the same time, in conjunction with the elastic buffer of the first compression spring, the stress load on the steel-cored aluminum stranded wire is reduced twice, protecting the integrity of the steel-cored aluminum stranded wire stranding structure.

[0015] The intermediate ring and the cylinder are connected by a plug-in plate and a snap-fit ​​part to form a snap-fit ​​limit. When the tension exceeds the buffer range of the first compression spring, the continuously increasing traction force will cause the disc to not contact the plug-in plate. At this time, the disc loses its limiting effect on the plug-in plate. Under the action of the rebound force of the second compression spring, the extrusion rod moves along the shaft hole and extrudes the plug-in plate, causing the snap-fit ​​part to disengage from the snap-fit ​​hole, releasing the snap-fit ​​limit between the intermediate ring and the cylinder, realizing overload relief, so that the bent part is fully unfolded, causing the steel-cored aluminum stranded wire to produce a rebound and jerking state. At this time, the personnel standing at the winch attachment observe the rebound and jerking state of the steel-cored aluminum stranded wire and stop the winch operation in time. After troubleshooting, the winch is restarted. On the one hand, it serves as a reminder to stop the winch operation, and on the other hand, it avoids the first compression spring from being over-compressed and failing, and the steel-cored aluminum stranded wire from being subjected to excessive force. The first compression spring is responsible for normal buffering, and the second compression spring is responsible for overload triggering. The two have clear division of labor and do not interfere with each other. Attached Figure Description

[0016] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a tension adjustment device for laying power lines according to the present invention; Figure 2 Another perspective view of a tension adjustment device for laying power lines according to the present invention; Figure 3 This is a cross-sectional view of a tension adjustment device for laying power lines according to the present invention. Figure 4 This is a cross-sectional assembly diagram of the straight cylinder and the cylinder body in a power line laying tension adjustment device according to the present invention; Figure 5 This is an exploded structural diagram of the first compression spring, guide rod, disc, end cap, cylinder, straight cylinder and intermediate ring in a power line laying tension adjustment device of the present invention. Figure 6 This is a perspective view of the cylinder in a power line laying tension adjustment device according to the present invention; Figure 7 This is a schematic diagram of the assembly of the plug plate and the intermediate ring in a power line laying tension adjustment device according to the present invention. In the diagram: 100-Steel-cored aluminum stranded wire; 101-Bending section; 200-U-shaped screw; 201-First nut; 202-Pressure block; 300-Intermediate ring; 301-Plug-in plate; 3011-Snap-fit ​​section; 302-Ventilation hole; 400-Straight cylinder; 401-Extrusion rod; 4011-Limiting plate; 402-Second compression spring; 403-Threaded head; 4031-Hexagonal socket; 500-Cylinder body; 501-End cap; 5011-Connecting ring; 5012-Guide hole; 502-Guide rod; 5021-Connecting plate; 5022-Second nut; 503-Disc body; 504-First compression spring; 505-Snap-fit ​​hole; 506-Shaft hole; 507-Plug-in groove. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] Please see Figures 1-7 This invention provides a technical solution: a tension adjustment device for power line laying, comprising two U-shaped screws 200 sleeved on a steel-cored aluminum stranded wire 100, a pressure block 202 sleeved on the U-shaped screws 200, and a first nut 201 threadedly connected to both ends of the U-shaped screws 200; the cooperation of the U-shaped screws 200 with the pressure block 202 and the first nut 201 can quickly and firmly clamp the device onto the steel-cored aluminum stranded wire 100 without the need for cutting, welding or other processing of the steel-cored aluminum stranded wire 100, making installation and disassembly convenient and without damaging the steel-cored aluminum stranded wire 100; the pressure block 202 has an arc-shaped groove, and when the first nut 201 is tightened, the steel-cored aluminum stranded wire 100 is tightly pressed into the arc-shaped groove and the arc-shaped part of the U-shaped screw 200.

[0019] The steel-cored aluminum stranded wire 100 forms a bend 101 between the two U-shaped screws 200. An intermediate ring 300 is provided between the two U-shaped screws 200. Multiple ventilation holes 302 are provided at equal intervals on the outer surface of the intermediate ring 300. The multiple ventilation holes 302 on the outer surface of the intermediate ring 300 are used to allow air circulation between its interior and the outside, and to prevent the disc body 503 from sliding due to changes in internal air pressure during the buffering process.

[0020] Both sides of the intermediate ring 300 are provided with cylinders 500. Multiple plug-in plates 301 arranged in a ring at equal intervals are installed on the two parallel sides of the intermediate ring 300. A snap-fit ​​part 3011 is installed at the end of the plug-in plate 301 away from the intermediate ring 300. The plug-in plate 301 and the intermediate ring 300 are integrally formed. The snap-fit ​​part 3011 and the plug-in plate 301 are integrally formed. The integral forming improves the structural strength.

[0021] The inner side of the cylinder 500 near the middle ring 300 has multiple insertion slots 507 arranged in an annular pattern at equal intervals, and the insertion plate 301 is inserted into the insertion slot 507. The outer surface of the cylinder 500 has multiple snap-fit ​​holes 505 arranged in an annular pattern at equal intervals. The snap-fit ​​holes 505 communicate with the insertion slots 507, and the snap-fit ​​part 3011 is inserted into the snap-fit ​​hole 505. In the initial state, the disc 503 is set between the multiple insertion plates 301 and the disc 503 slides in contact with the insertion plates 301. The side of the insertion plate 301 facing the disc 503 is machined with an arc-shaped surface. The annular side of the disc 503 fits against the arc-shaped surface to facilitate the smooth sliding of the disc 503. The precise fit between the plug plate 301 and the plug groove 507, and between the snap-fit ​​part 3011 and the snap-fit ​​hole 505, enables reliable snap-fit ​​limiting between the intermediate ring 300 and the cylinder 500, ensuring structural stability during normal buffering. In the initial state, the disc 503 slides against the arc-shaped surface of the plug plate 301, ensuring normal movement of the disc 503 and limiting the plug plate 301 to prevent the snap-fit ​​part 3011 from disengaging under non-overload conditions. When the tension exceeds the buffering range, the disc 503 separates from the plug plate 301, releasing the limiting.

[0022] An end cap 501 is installed at the end of the cylinder 500 away from the intermediate ring 300. A connecting ring 5011 is installed at the end of the cylinder 500 away from the intermediate ring 300. The connecting ring 5011 is connected to the end cap 501 by multiple sets of bolts. A guide hole 5012 is opened in the middle of one side of the end cap 501. A guide rod 502 is inserted into the guide hole 5012. The cross-section of the guide rod 502 and the guide hole 5012 is rectangular. The rectangular cross-section prevents the circumferential rotation of the guide rod 502 in the guide hole 5012, and avoids the disc 503 from tilting due to rotation.

[0023] A connecting plate 5021 is installed at the end of the guide rod 502 away from the disc 503. Two round holes are opened on one side of the connecting plate 5021. The two ends of the U-shaped screw 200 pass through the two round holes respectively. A second nut 5022 is provided on both sides of the round holes. The second nut 5022 is threadedly connected to the U-shaped screw 200, thus completing the connection between the end of the guide rod 502 outside the cylinder 500 and the U-shaped screw 200. The disc 503 is installed at the end of the guide rod 502 inside the cylinder 500. The disc 503 is slidably installed inside the cylinder 500. A first compression spring 504 is provided between the disc 503 and the end cover 501. The first compression spring 504 is sleeved on the guide rod 502.

[0024] With the first compression spring 504 as the core, an elastic buffer structure is constructed in conjunction with the guide rod 502 and the disc 503. When the steel-cored aluminum stranded wire 100 encounters resistance and the tension suddenly increases during the laying and traction, the resulting traction force will push the guide rod 502 to drive the disc 503 to move synchronously, thereby squeezing the first compression spring 504. With the help of the elastic deformation characteristics of the first compression spring 504, the excess tension exceeding the safe range is effectively absorbed and dissipated, realizing real-time flexible control of the tension of the steel-cored aluminum stranded wire 100. This ensures that the tension on the steel-cored aluminum stranded wire 100 is always controlled within the safe tolerance range, thus avoiding damage problems such as loosening of the stranded joints, breakage of the outer aluminum wire, and even breakage of the internal steel core caused by continuous traction of the winch and continuous increase in tension from the source. Meanwhile, the steel-cored aluminum stranded wire 100 naturally forms a bend 101 between the two U-shaped screws 200. During the laying process, the bend 101 can be appropriately expanded with the change of tension, further dispersing the concentrated traction force to more parts of the steel-cored aluminum stranded wire 100, avoiding the concentration of tension at a single point. Combined with the elastic buffering effect of the first compression spring 504, a double force relief protection is formed, reducing the overall stress load on the steel-cored aluminum stranded wire 100, effectively protecting the stranded structure of the steel-cored aluminum stranded wire 100 from damage, and ensuring its structural integrity.

[0025] The outer surface of the cylinder 500 has multiple axial holes 506 arranged in an annular pattern at equal intervals, and the axial holes 506 communicate with the insertion groove 507. A straight cylinder 400 is arranged concentrically with the axial holes 506 outside the axial holes 506, and one end of the straight cylinder 400 is connected and fixed to the cylinder 500. A pressing rod 401 is provided inside the straight cylinder 400 near the axial hole 506. One end of the pressing rod 401 passes through the axial hole 506 and contacts the insertion plate 301. A limiting plate 4011 is installed at the end of the pressing rod 401 away from the insertion plate 301. The limiting plate 4011 is slidably installed inside the straight cylinder 400. The end of the straight cylinder 400 away from the axial hole 506 is closed. A second compression spring 402 is provided on the side of the limiting plate 4011 away from the pressing rod 401. The second compression spring 402 is located inside the straight cylinder 400. The intermediate ring 300 and the cylinder 500 form a stable limiting structure through the engagement of the plug plate 301 and the snap-fit ​​part 3011. When the tension on the steel-cored aluminum stranded wire 100 exceeds the buffer bearing range of the first compression spring 504, the continuously increasing traction force will drive the disc 503 to move to a position separated from the plug plate 301, and the limiting effect of the disc 503 on the plug plate 301 will also disappear. At this time, under the action of the rebound force of the second compression spring 402, the extrusion rod 401 moves along the shaft hole 506 toward the plug plate 301 and extrudes it, causing the snap-fit ​​part 3011 to disengage from the snap-fit ​​hole 505, thereby releasing the snap-fit ​​limiting between the intermediate ring 300 and the cylinder 500, and realizing overload relief.

[0026] After the locking limit is released, the bent portion 101 on the aluminum steel-cored stranded wire 100 will fully unfold, causing a noticeable rebound and jerking phenomenon. Operators near the winch can immediately detect overload issues and stop the winch operation through this intuitive change in state. Operation can only be restarted after troubleshooting and resolving faults such as line obstruction. This design not only provides timely overload warnings to operators but also prevents the first compression spring 504 from losing its elasticity due to excessive compression, and fundamentally prevents damage such as breakage or loosening of the aluminum steel-cored stranded wire 100 due to excessive stress.

[0027] A threaded head 403 is threadedly connected to the side of the straight cylinder 400 away from the shaft hole 506. The center of the side of the threaded head 403 facing away from the limiting plate 4011 is recessed to form an internal hexagonal hole 4031 for engaging an internal hexagonal wrench. A second compression spring 402 is provided between the threaded head 403 and the limiting plate 4011. The threaded head 403 and the straight cylinder 400 are connected by a threaded connection. By turning the threaded head 403 with an internal hexagonal wrench, its axial position within the straight cylinder 400 can be flexibly adjusted, thereby changing the initial preload of the second compression spring 402. The magnitude of the preload of the second compression spring 402 directly determines the threshold force of the pressing rod 401 pushing the insertion plate 301. By adjusting the preload, the overload trigger pull value for the engaging part 3011 to disengage from the engaging hole 505 can be flexibly set. This design adjusts the overload protection threshold specifically for steel-cored aluminum stranded wire 100 with different wire diameters and mechanical resistance properties, perfectly adapting to the tension adjustment needs of laying multi-specification conductors. It eliminates the need to customize special adjustment devices for different conductors, simplifies the configuration of construction equipment, and reduces the procurement and use costs of construction equipment.

[0028] Working principle of this invention: To address the issue of excessive traction force leading to conductor damage during the overhead laying of 100mm steel-cored aluminum stranded wire, an innovative two-stage tension protection mechanism is designed, consisting of normal flexible buffering and overload rigid unloading. This mechanism integrates overload visualization prompts and flexible threshold adjustment, achieving tension control of the 100mm steel-cored aluminum stranded wire through multi-component collaboration. It also considers the adaptability and recoverability of the device, fundamentally solving the technical problem of ineffective tension control in traditional laying methods. The core invention principle is summarized as follows: Based on elastic buffering, the core structure for normal tension adjustment is formed by the first compression spring 504, guide rod 502, and disc 503. Excess tension is absorbed by elastic deformation, achieving real-time flexible tension adjustment. With mechanical locking and overload triggering as the core, the overload protection structure is formed by the locking structure between the intermediate ring 300 and the cylinder 500, and the compression mechanism. When the tension exceeds the set threshold, the locking limit is automatically released, achieving rigid force relief. Simultaneously, the structural deformation of the steel-cored aluminum stranded wire 100 creates a visual fault indication, allowing operators to promptly detect overload problems. The threaded adjustment structure enables flexible adaptation of the overload threshold, meeting the tension adjustment needs of different specifications of steel-cored aluminum stranded wire 100. Furthermore, the entire overload response process is a temporary structural change; after fault elimination, the device can be quickly reset and its function restored. Each structure has a clear division of labor and works in concert, forming a complete tension control and protection system.

[0029] Specifically, the normal flexible buffer principle is as follows: the U-shaped screw 200 and the pressure block 202 are clamped onto the steel-cored aluminum stranded wire 100, so that the steel-cored aluminum stranded wire 100 forms a bend 101 between the two U-shaped screws 200. When the conductor encounters resistance during the laying process, causing a slight increase in tension, the traction force is transmitted to the buffer, pushing the guide rod 502 to drive the disc 503 to compress the first compression spring 504. Utilizing the elastic deformation characteristics of the first compression spring 504, the excess tension exceeding the safe range is quickly absorbed and dissipated. At the same time, the bend 101 unfolds appropriately with the tension, further dispersing the traction force and avoiding tension concentration. The two work together to achieve real-time flexible adjustment of tension, so that the tension on the steel-cored aluminum stranded wire 100 is always stable within the safe tolerance range, preventing problems such as stranding loosening and aluminum wire breakage caused by continuous increase in tension.

[0030] The overload rigid unloading principle is as follows: The interlocking plate 301 and the locking part 3011 reliably lock and limit the connection between the intermediate ring 300 and the cylinder 500, providing structural support for normal buffering. Initially, the disc 503 is in contact with the arc-shaped surface of the interlocking plate 301, forming a radial limit on the interlocking plate 301, preventing the locking part 3011 from disengaging under non-overload conditions. When the tension on the steel-cored aluminum stranded wire 100 exceeds the buffering range of the first compression spring 504 and reaches the preset overload threshold, the continuously increasing traction force... This will cause the disc 503 to move axially along the cylinder 500, completely separating it from the plug plate 301 and releasing the limiting effect on the plug plate 301; at this time, the rebound force of the second compression spring 402 pushes the extrusion rod 401 to press the plug plate 301, causing the snap-fit ​​part 3011 to disengage from the snap-fit ​​hole 505, releasing the snap-fit ​​limitation between the intermediate ring 300 and the cylinder 500, realizing rigid unloading of overload, avoiding the failure of the first compression spring 504 due to excessive compression, and fundamentally preventing the steel core aluminum stranded wire 100 from being damaged by excessive force.

[0031] The principle of the overload visualization prompt is as follows: When the locking limit between the intermediate ring 300 and the cylinder 500 is released, the bent part 101 on the steel-cored aluminum stranded wire 100 will be fully unfolded under the action of traction force, causing the steel-cored aluminum stranded wire 100 to instantly produce obvious structural deformation of rebound and jerking. This state can be directly observed by the operator next to the winch, thus forming an intuitive overload fault prompt, allowing the operator to stop the winch operation in time, check and eliminate faults such as line obstruction, and avoid construction accidents and material losses caused by the expansion of the fault.

[0032] The principle of flexible overload threshold adjustment is as follows: A threaded head 403 with an internal hexagonal hole 4031 is set inside the straight cylinder 400 of the extrusion mechanism. The threaded head 403 is threadedly connected to the straight cylinder 400. By turning the threaded head 403 with an internal hexagonal wrench, its axial position inside the straight cylinder 400 can be flexibly adjusted, thereby changing the initial preload of the second compression spring 402. The magnitude of the preload of the second compression spring 402 directly determines the force threshold of the extrusion rod 401 pushing the plug plate 301. The greater the preload, the greater the pulling force required to trigger overload relief, and vice versa. Through this structure, the overload tension threshold can be set on-site according to steel-cored aluminum stranded wires 100 with different wire diameters and different mechanical resistance properties, without the need for customized special devices, greatly improving the versatility and adaptability of the device.

[0033] Meanwhile, the structural recoverability of this device provides practical assurance for the implementation of the above principle: the rebound and jerk state caused by overload triggering is a temporary structural response and not irreversible damage. After the operator checks and eliminates the fault, he only needs to re-snap the locking part 3011 into the locking hole 505 and reset the disk body 503 and the first compression spring 504 to restore the normal buffer and overload protection functions. There is no need to disassemble or replace the entire device, which greatly improves construction efficiency and reduces equipment maintenance costs.

[0034] In addition, the auxiliary structures further ensure the realization of the core principle: the rectangular cross-section guide rod 502 cooperates with the guide hole 5012 to prevent the guide rod 502 from rotating circumferentially, ensuring that the disc 503 slides smoothly and the traction force is transmitted in a straight line; the vent hole 302 of the intermediate ring 300 realizes the air pressure balance between the inside and outside of the device, preventing air pressure changes from affecting the sliding of the disc 503, and at the same time reducing the accumulation of dust and moisture inside; the arc-shaped groove of the pressure block 202 fits with the steel-cored aluminum stranded wire 100, which not only improves the firmness of the clamping, but also avoids damaging the steel-cored aluminum stranded wire 100; the arc-shaped surface of the plug plate 301 fits with the annular side of the disc 503, which not only provides a smooth sliding guide for the disc 503, but also realizes the radial limit of the plug plate 301, ensuring the stability of the snap-fit ​​structure.

[0035] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tension adjustment device for power line laying, characterized in that, include: Two U-shaped screws (200) are provided, which are sleeved on the steel-cored aluminum stranded wire (100). Each U-shaped screw (200) is provided with a pressure block (202) and is fastened by a first nut (201), so that the steel-cored aluminum stranded wire (100) forms a bend (101) between the two U-shaped screws (200). An intermediate ring (300) is disposed between the two U-shaped screws (200), and a plurality of vent holes (302) are provided on the outer surface of the intermediate ring (300). The buffer consists of two buffers, which are respectively disposed on both sides of the intermediate ring (300) and are detachably plugged into the intermediate ring (300). The end of each buffer away from the intermediate ring (300) is connected to the corresponding U-shaped screw (200). The buffer is configured to provide flexible stretch margin under normal tension; when the tension exceeds a preset threshold, it is disconnected from the intermediate ring (300) to allow the bent portion (101) to unfold instantly; wherein the unfolded state of the bent portion (101) serves as a physical indication signal of tension overload.

2. The tension adjustment device for power line laying according to claim 1, characterized in that, The buffer includes: A cylindrical body (500) is connected to the intermediate ring (300) via a plug-in assembly; End cap (501), the end cap (501) is located at one end of the cylinder (500) away from the intermediate ring (300), and a guide hole (5012) is provided in the middle of the end cap (501). Guide rod (502), the guide rod (502) is slidably inserted in the guide hole (5012), the cross-section of the guide rod (502) is rectangular, and the guide hole (5012) is a rectangular hole; The disc body (503) is fixed to one end of the guide rod (502) that extends into the cylinder (500) and slides in cooperation with the inner wall of the cylinder (500); The first compression spring (504) is sleeved on the guide rod (502) and located between the disc body (503) and the end cap (501); A connecting component is provided at one end of the guide rod (502) extending from the end cap (501) for connecting with the U-shaped screw (200).

3. The tension adjustment device for power line laying according to claim 2, characterized in that, The plug-in assembly includes: A plug-in board (301), wherein there are multiple plug-in boards (301). The plug-in plates (301) are arranged in a ring at equal intervals on two parallel sides of the intermediate ring (300), and each plug-in plate (301) has a snap-fit ​​part (3011) at one end away from the intermediate ring (300). The number of the insertion slots (507) is the same as the number of the insertion plates (301) and they correspond one-to-one. The insertion slots (507) are respectively opened at one end of the cylinder (500) near the middle ring (300) to accommodate the insertion plates (301). The number of snap-fit ​​holes (505) is the same as the number of insertion slots (507) and they correspond one-to-one. The snap-fit ​​holes (505) are opened on the outer surface of the cylinder (500) and communicate with the insertion slots (507) for snapping the snap-fit ​​part (3011). The extrusion mechanism is the same number as the snap-fit ​​part (3011) and corresponds one-to-one. The extrusion mechanism is located on the outer surface of the cylinder (500) and is used to push the snap-fit ​​part (3011) out of the snap-fit ​​hole (505) when overloaded. The disk body (503) initially slides in contact with the plug plate (301) to form a limiting fit.

4. The tension adjustment device for power line laying according to claim 3, characterized in that: The extrusion mechanism includes: A straight cylinder (400) is fixed to the outer surface of the cylinder body (500) and is concentrically arranged with the shaft hole (506) opened on the cylinder body (500). The number of shaft holes (506) and insertion slots (507) are the same and they correspond to each other and communicate with each other. The extrusion rod (401) is slidably disposed inside the straight cylinder (400), and one end of the extrusion rod (401) passes through the shaft hole (506) and contacts the plug plate (301); A limiting plate (4011) is provided at the other end of the extrusion rod (401); The second compression spring (402) is disposed inside the straight cylinder (400) and is located between the limiting plate (4011) and the closed end of the straight cylinder (400).

5. A power line laying tension adjustment device according to claim 4, characterized in that: The straight cylinder (400) is threaded to a threaded head (403) at one end away from the shaft hole (506). The threaded head (403) has an internal hexagonal hole (4031) at one end. The second compression spring (402) is located between the limiting plate (4011) and the threaded head (403). The spring preload is adjusted by rotating the threaded head (403), thereby setting the overload unloading threshold.

6. A power line laying tension adjustment device according to claim 3, characterized in that: The plug plate (301) and the intermediate ring (300) are integrally formed. The snap-fit ​​part (3011) and the plug plate (301) are integrally formed. The side of the plug plate (301) facing the disk body (503) is processed with an arc-shaped surface. The annular side of the disk body (503) is in contact with the arc-shaped surface.

7. A power line laying tension adjustment device according to claim 2, characterized in that: The connecting assembly includes a connecting plate (5021), which is fixed to the extended end of the guide rod (502). The connecting plate (5021) has two round holes. The two ends of the U-shaped screw (200) pass through the two round holes respectively and are locked by the second nut (5022).

8. A tension adjustment device for power line laying according to claim 2, characterized in that: A connecting ring (5011) is installed at one end of the cylinder (500) away from the intermediate ring (300). The connecting ring (5011) is detachably connected to the end cap (501) by multiple sets of bolts.

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