Power tower high-voltage line pre-tightening device and pre-tightening method

Abstract

The application discloses a power iron tower high-voltage line pre-tightening device and a pre-tightening method, relates to the technical field of high-voltage line installation, and the power iron tower high-voltage line pre-tightening device comprises a traction assembly, a clamping assembly and a rotating seat. The traction assembly comprises a mounting seat, two traction gears are rotationally connected to the mounting seat, a toothed belt is inserted between the two traction gears, and a driving mechanism for driving the traction gears to rotate is arranged on the mounting seat. The clamping assembly comprises two clamping seats arranged correspondingly, a middle groove is formed in the side surface of the clamping seat, a pressing block is slidably arranged in the middle groove, the end portion of the pressing block is connected with the clamping seat through elastic sheets, and a fastening mechanism is arranged between the two clamping seats. The rotating seat is rotationally connected to the side surface of the clamping seat through a side seat. The application effectively prevents relative sliding between the cable and the clamping component, and can timely emergently lock the traction component when the traction component is broken, thereby improving the installation construction quality and safety of the high-voltage line.

Description

Technical Field

[0001] This invention relates to the field of high-voltage line installation technology, specifically to a pre-tightening device and method for high-voltage lines on power transmission towers. Background Technology

[0002] During the installation and construction of high-voltage power transmission towers, pre-tensioning is one of the core steps to ensure the long-term safe and stable operation of the lines. Its core purpose is to ensure that the high-voltage lines reach the preset tension standard, so as to avoid potential hazards such as line swaying, insufficient phase-to-phase distance, icing and dancing, or fatigue wear after long-term operation caused by cable slack, and to ensure the reliability and safety of power transmission.

[0003] Chinese patent application number 202311421070.X discloses a high-voltage line traction pre-tensioning device for power poles, belonging to the field of high-voltage line laying technology. It includes an L-shaped frame with a winding mechanism installed at the bottom; a guide mechanism installed on the upper part of the frame corresponding to the winding mechanism, the guide mechanism including a set of guide wheels with adjustable conveyor line dimensions; a locking mechanism at the front end of the upper part of the frame corresponding to the guide mechanism; and a pressing mechanism at the rear end of the upper part of the frame corresponding to the guide mechanism. The locking mechanism includes at least a pair of locking blocks for reverse locking, and the conveyor line dimensions between the locking blocks can be adjusted accordingly. However, when the traction force on the cable gradually increases, the friction between the cable and the inner wall of the clamping part is difficult to increase synchronously, easily leading to relative sliding between the cable and the clamping part, resulting in failure of pre-tensioning force transmission.

[0004] Furthermore, during pre-tensioning operations, the traction components are subjected to significant tension for extended periods. Under high-frequency use or overload conditions, fatigue fracture is likely to occur. Once the traction components break, the cable will quickly retract and pull out under its own tension and gravity, not only rendering the previous pre-tensioning results completely ineffective but also potentially causing safety accidents such as cable swinging and equipment collisions, posing a potential threat to construction personnel and surrounding power facilities. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a pre-tightening device and method for high-voltage lines of power towers, which can effectively prevent relative slippage between the cable and the clamping component, and can lock the traction component in time when the traction component breaks, thereby improving the quality and safety of high-voltage line installation and construction, and can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention discloses the following technical solution:

[0007] On one hand, the present invention discloses a pre-tensioning device for high-voltage lines of power transmission towers, comprising:

[0008] Traction assembly: includes a mounting base, on which two traction gears are rotatably connected, and a toothed belt is inserted between the two traction gears. The mounting base is provided with a drive mechanism for driving the traction gears to rotate.

[0009] Clamping assembly: includes two corresponding clamping seats, each clamping seat has a through groove on its side, a pressure block is slidably fitted in the groove, the end of the pressure block is connected to the clamping seat through an elastic sheet, and a fastening mechanism is provided between the two clamping seats;

[0010] It also includes a rotating seat, which is rotatably connected to the side of the clamping seat via a side seat, and the side of the rotating seat is provided with a protrusion that corresponds to and cooperates with the pressure block;

[0011] Linkage component: includes two corresponding connecting rods, the ends of the two connecting rods are respectively movably connected to the clamping seats on both sides, and the other ends of the two connecting rods are respectively provided with end seats;

[0012] It also includes a guide groove on the side of the end seat, a slider is slidably connected in the guide groove, a limiting gear is provided between the sliders on both sides, an elastic element is provided between the slider and the end face of the guide groove, a guide rod is provided on the slider and passes through the end of the end seat, and a connecting member is provided between the end of the guide rod and the protrusion.

[0013] Preferably, the toothed belt has meshing teeth on both sides, and the meshing teeth on both sides of the toothed belt mesh with two traction gears respectively. The end of the toothed belt is fixedly connected to the mounting base through a connecting frame.

[0014] Preferably, the bottom of the mounting base is detachably connected to a fixing slot by screws, a cable is inserted inside the fixing slot, the fixing slot is a T-shaped structure, a fastener passes through the side of the fixing slot, a nut is threaded to the end of the fastener, an insulator string is hinged to the end of the fixing slot, and a mounting bracket is hinged to the end of the insulator string, and the mounting bracket is installed on an external power tower.

[0015] Preferably, the drive mechanism includes a worm gear, a worm, and a traction motor. The worm gear is fixedly sleeved on the end of the traction gear, the worm is rotatably connected to the side of the mounting base, and the worm meshes with the worm gear. The traction motor is located on the side of the mounting base, and the output shaft of the traction motor is fixedly connected to the end of the worm.

[0016] Preferably, the clamping assembly further includes a support plate disposed at the ends of the two clamping seats, wherein a limiting wheel is rotatably connected to the support plate, and the limiting wheel has a concave arc-shaped structure in the middle.

[0017] Preferably, the fastening mechanism includes a connecting seat, which is disposed on the upper and lower sides of each clamping seat. Among the two corresponding connecting seats on the two clamping seats, one connecting seat is rotatably connected to a stud, and the other connecting seat is provided with a threaded hole.

[0018] Preferably, the end of the connecting rod is hinged to the rotating seat;

[0019] A connecting gear is rotatably connected between the two end seats, and the toothed belt is sleeved on the outside of the connecting gear.

[0020] On the other hand, the present invention also discloses a pre-tightening method for a high-voltage line pre-tightening device for power transmission towers, the steps of which are as follows:

[0021] Step S1: Place the high-voltage line to be pre-tightened in the preset working position, place the two clamping seats on both sides of the high-voltage line, and use the fastening mechanism of the clamping assembly to bring the two clamping seats together and firmly clamp the high-voltage line.

[0022] Step S2: Keep the toothed belt of the traction assembly engaged with the two traction gears. At this time, the limit gear engages with the toothed belt to achieve initial mechanical locking.

[0023] Step S3: Fix the mounting base in the preset position, and at the same time, disengage the limit gear from the toothed belt to release the initial mechanical lock on the toothed belt;

[0024] Step S4: Start the drive mechanism to drive the traction gear to rotate. Through the meshing transmission between the toothed belt and the traction gear, the toothed belt will generate a retracting motion, pulling the high-voltage line to tighten.

[0025] Step S5: During the process of tightening the high-voltage line, the rotating seat rotates, the protrusion squeezes the pressure block to slide, and the elastic sheet produces elastic deformation, so that the pressure block tightly presses against the surface of the high-voltage line, enhancing the clamping firmness.

[0026] Step S6: If the toothed belt breaks unexpectedly, the traction force disappears, the elastic plate drives the pressure block to slide and reset, the pressure block pushes against the protrusion in the opposite direction, releasing the tension on the connecting part, the elastic element contracts and resets, and drives the slider and the limit gear to move towards the toothed belt, the limit gear meshes with the toothed belt and restores the mechanical lock.

[0027] Step S7: When the pre-tightening force of the high-voltage line reaches the preset requirement, stop the drive mechanism, disassemble the mounting base, remove the pre-tightening device, and complete the pre-tightening of the high-voltage line.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. This invention utilizes the combined action of the reverse tension generated by the cable and the traction force transmitted by the connecting rod to drive the rotating seat to rotate the protrusion. The protrusion squeezes the pressure block in the groove to slide towards the cable, so that the inner arc surface of the pressure block tightly presses against the surface of the cable. The greater the tension on the cable, the stronger the squeezing force of the protrusion on the pressure block, and the higher the fit between the pressure block and the cable. By dynamically increasing the friction and the initial clamping force of the clamping seat, the bonding firmness between the clamping component and the cable is greatly enhanced, avoiding relative sliding between the cable and the clamping seat, and ensuring the continuity and effectiveness of the pre-tightening operation.

[0030] 2. When the toothed belt breaks unexpectedly during normal pre-tensioning, the traction force disappears, the elastic plate resets, causing the pressure block to slide and push against the rotating protrusion. After the tension of the connecting piece is released, the elastic piece contracts and resets, causing the slider and the limit gear to move towards the connecting gear, re-engage with the toothed belt to achieve mechanical locking, preventing the connecting gear from rotating and the cable from retracting and being pulled out. The fasteners are tightened in time to lock the cable. Subsequent pre-tensioning operations can continue without redeploying the device, greatly improving operational safety and construction continuity. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a partial structural diagram of the present invention;

[0033] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0034] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B;

[0035] Figure 5 This is a schematic diagram of the structure of the present invention from another angle;

[0036] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point C.

[0037] In the diagram: 1. Fixed slot seat; 101. Fastener; 102. Nut; 103. Insulator string; 104. Mounting bracket; 2. Traction assembly; 201. Mounting seat; 202. Traction gear; 203. Toothed belt; 204. Worm gear; 205. Worm; 206. Traction motor; 3. Clamping assembly; 301. Clamping seat; 303. Connecting seat; 304. Stud; 305. Threaded hole; 306. Support plate; 307. Limiting wheel; 308. Middle slot; 309. Pressure block; 310. Elastic sheet; 311. Side seat; 312. Rotating seat; 313. Protrusion; 4. Linkage assembly; 401. Connecting rod; 402. End seat; 403. Connecting gear; 404. Guide groove; 405. Slider; 406. Limiting gear; 407. Elastic element; 408. Guide rod; 409. Connecting part. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1:

[0040] Please see Figure 1-6 This embodiment provides a pre-tensioning device for high-voltage lines of power transmission towers, comprising:

[0041] The traction assembly 2 includes a mounting base 201, on which two traction gears 202 are rotatably connected. A toothed belt 203 is inserted between the two traction gears 202. Both sides of the toothed belt 203 are provided with meshing teeth, which mesh with the two traction gears 202 respectively. The ends of the toothed belt 203 are fixedly connected to the mounting base 201 through a connecting bracket. The mounting base 201 is provided with a drive mechanism for driving the traction gears 202 to rotate.

[0042] Specifically, the drive mechanism drives one of the traction gears 202 to rotate, and drives the other traction gear 202 to rotate in the opposite direction through the toothed belt 203, thereby achieving the retraction and feeding of the toothed belt 203.

[0043] The drive mechanism includes a worm gear 204, a worm 205, and a traction motor 206. The worm gear 204 is fixedly sleeved on the end of the traction gear 202. The worm 205 is rotatably connected to the side of the mounting base 201 and meshes with the worm gear 204. The traction motor 206 is located on the side of the mounting base 201, and the output shaft of the traction motor 206 is fixedly connected to the end of the worm 205.

[0044] Specifically, the traction motor 206 drives the worm 205 to rotate, and the worm 205 drives the worm wheel 204 to rotate, which realizes the rotation of the traction gear 202. The transmission property between the worm wheel 204 and the worm 205 is used to realize the self-locking function of the traction gear 202, preventing the toothed belt 203 from retracting due to insufficient traction force.

[0045] It should be noted that the traction motor 206 can be replaced by a rotary handle, and the traction power can be provided by manually rotating the worm gear 205, so as to reduce the laying of circuits and improve portability.

[0046] The bottom of the mounting base 201 is detachably connected to a fixing slot 1 by screws. Cables are inserted inside the fixing slot 1. The fixing slot 1 has a T-shaped structure. Fasteners 101 pass through the side of the fixing slot 1. Nuts 102 are threaded to the end of the fasteners 101. Insulator strings 103 are hinged to the end of the fixing slot 1. Mounting brackets 104 are hinged to the end of the insulator strings 103. Mounting brackets 104 are installed on the external power tower.

[0047] Specifically, the bottom of the mounting base 201 is connected to the fixing slot 1 by screws, so that the mounting base 201 is detachable and can be easily removed after the pre-tightening operation is completed. During the pre-tightening process, the fixing slot 1 provides a stable support base for the mounting base 201. During the pre-tightening process, the nut 102 is tightened and the fastener 101 is in a loose state, so that the cable can pass through the fixing slot 1 as it is tightened. The fastener 101 is preferably a U-shaped structure.

[0048] The clamping assembly 3 includes two corresponding clamping seats 301. A fastening mechanism is provided between the two clamping seats 301. The fastening mechanism includes a connecting seat 303. The connecting seat 303 is located on the upper and lower sides of each clamping seat 301. Among the two corresponding connecting seats 303 on the two clamping seats 301, a stud 304 is rotatably connected to one connecting seat 303, and a threaded hole 305 is provided on the other connecting seat 303.

[0049] Specifically, the opposite sides of the two clamping seats 301 are arc-shaped and equipped with rubber pads to prevent the clamping seats 301 from causing wear to the cable. By placing the two clamping seats 301 on both sides of the cable and using a tool to screw the end of the stud 304 into the threaded hole 305, the clamping seats 301 on both sides can be gradually locked, thus securing the clamping seats 301 to the cable.

[0050] The clamping assembly 3 also includes a support plate 306 located at the ends of the two clamping seats 301. A limiting wheel 307 is rotatably connected to the support plate 306. The limiting wheel 307 has a concave arc-shaped structure in the middle.

[0051] After the two clamping seats 301 have clamped and fixed the cable, the limiting wheels 307 on both sides also fit tightly against the two sides of the cable to support and limit the cable, preventing the cable from loosening between the clamping seats 301 due to irregular bending and swinging.

[0052] Linkage component 4 includes two corresponding connecting rods 401. The ends of the two connecting rods 401 are movably connected to the clamping seats 301 on both sides. The other ends of the two connecting rods 401 are respectively provided with end seats 402. A connecting gear 403 is rotatably connected between the two end seats 402. A toothed belt 203 is sleeved on the outside of the connecting gear 403.

[0053] Specifically, the connecting rod 401 is preferably made of metal. When the traction assembly 2 drives the toothed belt 203 to retract and feed, the toothed belt 203 can provide traction force to the connecting gear 403 by meshing with it. At the same time, the toothed belt 203 drives the connecting gear 403 to rotate. The traction force on the connecting gear 403 is transmitted to the clamping seat 301 through the connecting rod 401, thereby realizing the traction and tightening of the cable.

[0054] In use, first, the mounting bracket 104 is fixedly installed at the predetermined position on the power tower, and the high-voltage cable to be pre-tightened is inserted into the groove of the fixing slot 1. At this time, the fastener 101 is in a loose state, and the nut 102 is not tightened temporarily so that the cable can move in the groove. Then, the mounting base 201 is installed on the top of the fixing slot 1 with screws.

[0055] Before pre-tightening, place the two clamping seats 301 on both sides of the cable, with their inner arc surfaces in contact with the cable. Rotate the stud 304 with a tool to screw it into the threaded hole 305 of the opposite connecting seat 303, thereby driving the two clamping seats 301 to move closer together until the cable is securely clamped. During this process, the concave arc surface of the limiting wheel 307 at the end of the clamping seat 301 also contacts the side of the cable, providing auxiliary support and limiting for the cable, preventing unexpected bending or swaying of the cable near the clamping seat 301 during pre-tightening. Then connect the ends of the two connecting rods 401 to the two clamping seats 301 respectively, and fit the toothed belt 203 onto the outside of the connecting gear 403.

[0056] When the pre-tensioning operation starts, the traction motor 206 is turned on. The output shaft of the traction motor 206 drives the worm 205 to rotate. The worm 205 drives the worm wheel 204, which meshes with it, to rotate. Since the worm wheel 204 is fixedly sleeved on the end of one of the traction gears 202, it drives the traction gear 202 to rotate. The two meshing teeth of the toothed belt 203 mesh with the two traction gears 202 respectively. Therefore, the rotation of one traction gear 202 is transmitted through the toothed belt 203, driving the other traction gear 202 to rotate synchronously in the opposite direction. The opposing rotation of the two traction gears 202 works together to cause the toothed belt 203, which is inserted between them, to produce a linear motion of contraction or release.

[0057] When the traction gear 202 drives the toothed belt 203 to perform a retraction movement, the toothed belt 203 applies a traction force to the connecting gear 403 through meshing with the connecting gear 403 and causes it to rotate. This traction force is transmitted to the clamping seat 301 through the connecting rod 401. As a result, the clamping seat 301 is subjected to a pulling force in the direction of the traction assembly 2. This pulling force is transmitted to the cable itself through the friction between the clamping seat 301 and the cable, thereby pulling the cable to move in the tightening direction in the groove of the fixed slot seat 1, and gradually realizing the pre-tensioning of the high-voltage cable.

[0058] Throughout the pre-tightening process, the transmission mechanism consisting of the worm gear 204 and the worm 205 has a self-locking characteristic, which can effectively prevent the traction gear 202 from accidentally reversing due to the reaction of cable tension, ensuring the stability of the toothed belt 203 and the cable position, with no risk of backlash. After the pre-tightening force reaches the required level, the traction motor 206 is stopped. Finally, the nut 102 at the end of the fastener 101 is tightened to lock the cable in the fixed slot 1, completing the pre-tightening operation. Then, the mounting base 201 is disassembled, and the entire pre-tightening device is removed.

[0059] Example 2:

[0060] However, during use, especially after prolonged use, the friction between the inner wall of the clamp 301 and the cable decreases. During pre-tightening operations, this can easily cause relative movement between the cable and the clamp 301, affecting the pre-tightening operation. Therefore, the following improvements are made:

[0061] A central groove 308 is provided through the side of the clamping seat 301. A pressure block 309 is slidably fitted in the central groove 308. The end of the pressure block 309 is connected to the clamping seat 301 through an elastic piece 310.

[0062] Specifically, the inner end face of the pressure block 309 is set as an arc-shaped structure that fits against the circumference of the cable and is provided with a rubber pad.

[0063] The clamping assembly 3 also includes a rotating seat 312, which is rotatably connected to the side of the clamping seat 301 via a side seat 311. The side of the rotating seat 312 is provided with a protrusion 313 that corresponds to and cooperates with the pressure block 309. The end of the connecting rod 401 is hinged to the rotating seat 312.

[0064] Specifically, the bump 313 is preferably as follows: Figure 4 The arc-shaped triangular structure shown has the connecting rod 401 and the rotating seat 312 hinged away from the protrusion 313.

[0065] Furthermore, during the cable traction and pre-tightening process, when the clamping seat 301 is subjected to the reverse tension from the cable, the traction force from the connecting rod 401 first acts on the rotating seat 312, causing the rotating seat 312 to rotate and drive the protrusion 313 to rotate towards the pressure block 309. When the protrusion 313 rotates, it presses against the pressure block 309, causing the pressure block 309 to slide towards the side of the internal cable. Under the reverse tension of the cable, the end of the pressure block 309 will tightly abut against the cable, and the greater the tension on the cable, the tighter the pressure block 309 abuts. At the same time, the elastic sheet 310 undergoes elastic deformation, which further fixes the cable and effectively prevents relative movement between the cable and the clamping seat 301.

[0066] In use, the traction motor 206 is started. As described in Example 1, the traction force is transmitted to the clamping seat 301 through the toothed belt 203, connecting gear 403, and connecting rod 401, and the cable is tensioned. As the cable is gradually tightened, the resulting reverse tension acts on the clamping seat 301. This reverse tension, together with the traction force transmitted through the connecting rod 401, causes the rotating seat 312 to have a tendency to rotate. The protrusion 313 then rotates further, applying a squeezing force to the pressure block 309.

[0067] Under the combined action of the extrusion force and the reverse tension of the cable, the pressure block 309 overcomes the elastic force of the elastic sheet 310 and slides towards the cable, so that the arc-shaped surface of the inner end of the pressure block 309 presses tightly against the surface of the cable. The greater the reverse tension of the cable on the clamping seat 301, the greater the pressing force of the protrusion 313 on the pressure block 309, thereby dynamically and adaptively increasing the friction between the pressure block 309 and the cable. The friction and the original clamping force of the clamping seat 301 are superimposed, which greatly enhances the firmness of the connection between the clamping component 3 and the cable, and effectively prevents the cable from slipping between the clamping seat 301 and the clamping seat 301 during the pre-tightening process.

[0068] In addition, after prolonged use, exceeding the fatigue strength limit of the toothed belt 203 can easily lead to accidental breakage. After breakage, the cable will quickly detach from the fixing slot under its own weight, resulting in pre-tensioning failure. Therefore, the following improvements are made:

[0069] The linkage component 4 also includes a guide groove 404 opened on the side of the end seat 402. A slider 405 is slidably connected in the guide groove 404. A limiting gear 406 is provided between the sliders 405 on both sides. An elastic element 407 is provided between the slider 405 and the end face of the guide groove 404. A guide rod 408 is provided on the slider 405, penetrating the end of the end seat 402. A connecting member 409 is provided between the end of the guide rod 408 and the protrusion 313.

[0070] Specifically, the elastic element 407 is preferably a spring, and the connecting element 409 is preferably a rope.

[0071] In use, after completing the preparatory work such as installing the fixed slot 1, inserting the cable, initially clamping the cable with the clamping seat 301, connecting the connecting rod 401 to the clamping seat 301, and fitting the toothed belt 203 onto the connecting gear 403, the mounting seat 201 is not yet fixed on the fixed slot 1, and there is a certain distance between the mounting seat 201 and the predetermined installation position on the fixed slot 1. The limiting gear 406 is in a meshing state with the outer side of the toothed belt 203. Since the limiting gear 406 cannot rotate freely, it restricts the rotation of the connecting gear 403, thereby achieving the initial mechanical locking of the toothed belt 203 and preventing the toothed belt 203 from moving when not in operation.

[0072] When fixing the mounting base 201, the operator needs to apply a pre-tension force to the mounting base 201 in the direction of fixing the slot 1, so that the mounting base 201 moves to the installation position. During the pre-tensioning process, the traction force is transmitted to the rotating base 312 through the connecting rod 401, forcing the rotating base 312 to rotate. The rotation of the rotating base 312 drives the side protrusion 313 to rotate synchronously.

[0073] When the protrusion 313 rotates, it will squeeze the pressure block 309, driving the pressure block 309 to slide a short distance in the direction of the cable within the central groove 308. During this pre-tensioning stage, although the pressure block 309 is displaced under the pressure, the arc-shaped surface at the inner end does not make substantial pressing contact with the cable surface. The elastic sheet 310 undergoes slight elastic deformation during this process.

[0074] At the same time, the rotation of the protrusion 313 pulls the guide rod 408 through the connector 409. The guide rod 408 drives the slider 405 to slide in the guide groove 404 and stretch the elastic element 407, so that the slider 405 and the limiting gear 406 move together away from the connecting gear 403. When the limiting gear 406 disengages from the toothed belt 203, the initial mechanical lock on the toothed belt 203 and the connecting gear 403 is released. At this time, the mounting base 201 moves to the predetermined position and is fixed to the fixing slot 1 with screws.

[0075] It should be noted that during normal pre-tightening operations, due to the increased traction force, the rotating seat 312 and the protrusion 313 will rotate further, and the distance between the limiting gear 406 and the connecting gear 403 will be further increased through the connector 409. The protrusion 313 provides sufficient squeezing force to the pressure block 309, which still maintains the pressure block 309 in further fixing the cable.

[0076] When the toothed belt 203 breaks, the traction force provided by the traction assembly 2 fails, and the tension of the connecting rod 401 on the rotating seat 312 weakens rapidly. This causes the squeezing force of the protrusion 313 on the pressure block 309 to decrease rapidly, resulting in the elastic sheet 310 causing the pressure block 309 to quickly reset due to elastic deformation. This causes the inner end of the pressure block 309 to detach from the cable. When the pressure block 309 slides back to the outside of the central groove 308, it will push against the protrusion 313 to rotate back to the outside, thereby relieving the tension exerted by the protrusion 313 on the connecting member 409. This causes the stretched elastic member 407 to contract and reset. The contraction of the elastic member 407... The reset mechanism drives the limiting gear 406 to move towards the connecting gear 403 via the slider 405, causing the limiting gear 406 to re-engage with the toothed belt 203. This restores the initial limiting position of the limiting gear 406 on the toothed belt 203 and the connecting gear 403, preventing the toothed belt 203 from detaching from the connecting gear 403. This effectively ensures the connection between the connecting gear 403 and the traction component 2 in the event of a breakage of the toothed belt 203, preventing the cable from retracting and being pulled out of the fixed slot 1. Then, the nut 102 is tightened to fix the cable in the fixed slot 1 with the fastener 101, facilitating subsequent pre-tightening operations.

[0077] It should be noted that no matter how much the protrusion 313 presses the pressure block 309, the contact position between the protrusion 313 and the pressure block 309 is always located on the side of the rotating seat 312 closer to the traction component 2, so as to ensure that the protrusion 313 can rebound smoothly when the elastic plate 310 is reset.

[0078] Example 3:

[0079] This embodiment also discloses a pre-tightening method for a high-voltage line pre-tightening device for power transmission towers, the steps of which are as follows:

[0080] Step S1: Place the high-voltage line to be pre-tightened in the preset working position, place the two clamping seats 301 on both sides of the high-voltage line, and use the fastening mechanism of the clamping assembly 3 to bring the two clamping seats 301 closer together and firmly clamp the high-voltage line.

[0081] Specifically, confirm that the high-voltage line has been de-energized and grounded to ensure operational safety. Check that all components of the pre-tightening device, including the traction component 2, clamping component 3, and linkage component 4, are intact, without deformation, cracks, or severe wear. Prepare the necessary tools: wrench, screwdriver, torque wrench, insulated gloves, safety belt, etc. Place the high-voltage line in the preset working position, ensuring that the cable can move freely within the fixed slot 1, avoiding twisting or bending. Adjust the positions of the insulator string 103 and the mounting bracket 104 to ensure a secure connection with the power tower. Place the two clamping seats 301 on both sides of the high-voltage line, ensuring that their inner arc surfaces are in contact with the cable surface. Use tools to rotate the stud 304, gradually screwing it into the threaded hole 305 of the opposite connecting seat 303, so that the two clamping seats 301 come together and clamp the high-voltage line. Check that the clamping is even to avoid damage to the cable caused by excessive tightness on one side.

[0082] Step S2: Keep the toothed belt 203 of the traction assembly 2 engaged with the two traction gears 202. At this time, the limiting gear 406 engages with the toothed belt 203 to achieve initial mechanical locking.

[0083] Specifically, ensure that the meshing teeth on both sides of the toothed belt 203 are correctly meshed with the two traction gears 202, without misalignment or jamming. Check whether the connecting bracket at the end of the toothed belt 203 is firmly fixed to the mounting base 201. Confirm that the limiting gear 406 is meshed with the toothed belt 203 under the action of the elastic element 407 to achieve initial mechanical locking. Manually try to rotate the connecting gear 403 to check if it cannot be rotated, and confirm that the locking is effective.

[0084] Step S3: Fix the mounting base 201 in the preset position, and at the same time, the limiting gear 406 disengages from the toothed belt 203, releasing the initial mechanical lock on the toothed belt 203.

[0085] Specifically, align the mounting base 201 with the preset installation position on the fixing slot 1 and initially fix it with screws. Before fixing, apply a pre-tension force to the mounting base 201 in the direction of the fixing slot 1 to slightly tension the toothed belt 203. The pre-tension force is transmitted to the rotating seat 312 through the connecting rod 401, which drives the protrusion 313 to rotate and pull the connecting piece 409 to disengage the limiting gear 406 from the toothed belt 203. After confirming that the limiting gear 406 is completely disengaged, thoroughly tighten the screws of the mounting base 201.

[0086] Step S4: Start the drive mechanism to drive the traction gear 202 to rotate. Through the meshing transmission between the toothed belt 203 and the traction gear 202, the toothed belt 203 will generate a contraction movement, pulling the high-voltage line to move in the tightening direction.

[0087] Specifically, start the traction motor 206 and observe whether the transmission between the worm gear 205 and the worm wheel 204 is smooth and whether there are any abnormal noises. The traction gear 202 drives the toothed belt 203 to retract, and transmits the tension to the clamping seat 301 through the connecting gear 403 and the connecting rod 401. Control the speed of the traction motor 206 to make the high-voltage line tighten slowly and smoothly, avoiding stress concentration caused by sudden pulling. Monitor the tension of the high-voltage line in real time. A tension meter can be used to assist in the judgment to ensure that the pre-tightening process is controllable.

[0088] Step S5: During the process of tightening the high-voltage line, the rotating seat 312 rotates, the protrusion 313 squeezes the pressure block 309 to slide, and the elastic sheet 310 produces elastic deformation, so that the pressure block 309 tightly presses against the surface of the high-voltage line, enhancing the clamping firmness.

[0089] Specifically, as the preload increases, the rotating seat 312 rotates further, and the protrusion 313 presses the pressure block 309 to slide towards the cable. Observe whether the pressure block 309 is tightly pressed against the cable surface. The elastic sheet 310 should have obvious elastic deformation. This mechanism should be able to adaptively enhance the clamping force and prevent the cable from slipping between the clamping seat 301 and the clamping seat 301.

[0090] Step S6: If the toothed belt 203 breaks unexpectedly, the traction force disappears, the elastic sheet 310 drives the pressure block 309 to slide back to its original position, the pressure block 309 pushes against the protrusion 313 in the opposite direction, releasing the tension on the connector 409, the elastic element 407 retracts and resets, and drives the slider 405 and the limiting gear 406 to move towards the toothed belt 203, the limiting gear 406 meshes with the toothed belt 203 to restore the mechanical lock;

[0091] Specifically, if the toothed belt 203 breaks unexpectedly, the traction force drops sharply. The elastic plate 310 drives the pressure block 309 to reset. During the reset process, the pressure block 309 rotates against the protrusion 313, releasing the tension on the connector 409. The elastic element 407 contracts, causing the slider 405 and the limiting gear 406 to move towards the toothed belt 203 and re-engage with it. At this time, the connecting gear 403 is locked to prevent the high-voltage line from retracting. At the same time, the traction motor 206 is stopped immediately, the cause of the toothed belt 203 is checked, and the nut 102 at the end of the fastener 101 is tightened quickly to temporarily lock the high-voltage line in the fixed slot. Operation can only continue after the toothed belt 203 is replaced or the repair device is repaired.

[0092] Step S7: When the pre-tightening force of the high-voltage line reaches the preset requirement, stop the drive mechanism, disassemble the mounting base 201, remove the pre-tightening device, and complete the pre-tightening of the high-voltage line.

[0093] Specifically, the tension of the high-voltage line is measured using a tension meter. Once the designed pre-tightening value is reached, traction is stopped. The posture of the insulator string 103 is observed to ensure it is normal and free from abnormal deviation or deformation. The traction motor 206 is stopped, the power of the drive mechanism is released, the connecting screws between the mounting base 201 and the fixed slot 1 are removed, the studs 304 of the clamping assembly are loosened, the clamping base 301 is removed, and the final position of the high-voltage line in the fixed slot 1 is checked to confirm that the fastener 101 has been tightened.

[0094] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pre-tightening device for high-voltage lines of power transmission towers, characterized in that, include: Traction assembly (2): includes a mounting base (201), on which two traction gears (202) are rotatably connected, and a toothed belt (203) is inserted between the two traction gears (202). The mounting base (201) is provided with a drive mechanism for driving the traction gears (202) to rotate. Clamping assembly (3): includes two corresponding clamping seats (301), the side of the clamping seat (301) is provided with a central groove (308), a pressure block (309) is slidably fitted in the central groove (308), the end of the pressure block (309) is connected to the clamping seat (301) through an elastic piece (310), and a fastening mechanism is provided between the two clamping seats (301); It also includes a rotating seat (312), which is rotatably connected to the side of the clamping seat (301) via a side seat (311). The side of the rotating seat (312) is provided with a protrusion (313) that corresponds to and cooperates with the pressure block (309). Linkage component (4): includes two corresponding connecting rods (401), the ends of the two connecting rods (401) are respectively movably connected to the clamping seats (301) on both sides, and the other ends of the two connecting rods (401) are respectively provided with end seats (402). It also includes a guide groove (404) opened on the side of the end seat (402), a slider (405) is slidably connected in the guide groove (404), a limiting gear (406) is provided between the sliders (405) on both sides, an elastic element (407) is provided between the end face of the slider (405) and the guide groove (404), a guide rod (408) is provided on the slider (405) and passes through the end of the end seat (402), and a connecting member (409) is provided between the end of the guide rod (408) and the protrusion (313). The toothed belt (203) has meshing teeth on both sides, and the meshing teeth on both sides of the toothed belt (203) mesh with two traction gears (202) respectively. The end of the toothed belt (203) is fixedly connected to the mounting base (201) through the connecting frame. The end of the connecting rod (401) is hinged to the rotating seat (312); A connecting gear (403) is rotatably connected between the two end seats (402), and the toothed belt (203) is sleeved on the outside of the connecting gear (403).

2. The power tower high-voltage line pre-tensioning device according to claim 1, characterized in that: The bottom of the mounting base (201) is detachably connected to a fixing slot (1) by screws. A cable is inserted inside the fixing slot (1). The fixing slot (1) has a T-shaped structure. A fastener (101) passes through the side of the fixing slot (1). A nut (102) is threaded to the end of the fastener (101). An insulator string (103) is hinged to the end of the fixing slot (1). An installation frame (104) is hinged to the end of the insulator string (103). The installation frame (104) is set on the external power tower.

3. The power tower high-voltage line pre-tensioning device according to claim 1, characterized in that: The drive mechanism includes a worm gear (204), a worm (205), and a traction motor (206). The worm gear (204) is fixedly sleeved on the end of the traction gear (202). The worm (205) is rotatably connected to the side of the mounting base (201) and meshes with the worm gear (204). The traction motor (206) is located on the side of the mounting base (201), and the output shaft of the traction motor (206) is fixedly connected to the end of the worm (205).

4. The power tower high-voltage line pre-tensioning device according to claim 1, characterized in that: The clamping assembly (3) also includes a support plate (306) located at the ends of the two clamping seats (301), and a limiting wheel (307) is rotatably connected to the support plate (306), the limiting wheel (307) having a concave arc-shaped structure in the middle.

5. The power tower high-voltage line pre-tensioning device according to claim 1, characterized in that: The fastening mechanism includes a connecting seat (303), which is located on the upper and lower sides of each clamping seat (301). Among the two corresponding connecting seats (303) on the two clamping seats (301), one connecting seat (303) is rotatably connected to a stud (304), and the other connecting seat (303) is provided with a threaded hole (305).

6. A pre-tightening method for a high-voltage line pre-tightening device for power transmission towers, wherein the pre-tightening method utilizes the high-voltage line pre-tightening device for power transmission towers as described in claim 1 to achieve pre-tightening of the high-voltage line, characterized in that, The steps are as follows: Step S1: Place the high-voltage line to be pre-tightened in the preset working position, place the two clamping seats (301) on both sides of the high-voltage line, and use the fastening mechanism of the clamping assembly (3) to bring the two clamping seats (301) closer together and firmly clamp the high-voltage line. Step S2: Keep the toothed belt (203) of the traction assembly (2) engaged with the two traction gears (202). At this time, the limiting gear (406) engages with the toothed belt (203) to achieve initial mechanical locking. Step S3: Fix the mounting base (201) in the preset position, and at the same time, the limiting gear (406) disengages from the toothed belt (203) to release the initial mechanical lock on the toothed belt (203); Step S4: Start the drive mechanism to drive the traction gear (202) to rotate. Through the meshing transmission between the toothed belt (203) and the traction gear (202), the toothed belt (203) will generate a contraction movement, pulling the high-voltage line to tighten. Step S5: During the tightening process of the high-voltage line, the rotating seat (312) rotates, the protrusion (313) squeezes the pressure block (309) to slide, and the elastic sheet (310) generates elastic deformation, so that the pressure block (309) tightly presses against the surface of the high-voltage line, thereby enhancing the clamping firmness. Step S6: If the toothed belt (203) breaks unexpectedly, the traction force disappears, the elastic sheet (310) drives the pressure block (309) to slide back to its original position, the pressure block (309) pushes against the protrusion (313) in the opposite direction, releasing the tension on the connector (409), the elastic element (407) contracts and resets, and drives the slider (405) and the limiting gear (406) to move towards the toothed belt (203), the limiting gear (406) meshes with the toothed belt (203) to restore the mechanical lock; Step S7: When the pre-tightening force of the high-voltage line reaches the preset requirement, stop the drive mechanism, disassemble the mounting base (201), remove the pre-tightening device, and complete the pre-tightening of the high-voltage line.

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