A power line stringing length measuring device

Abstract

The utility model relates to power engineering measurement technical field especially is involved in a kind of transmission line stringing length measuring device, including unmanned aerial vehicle, pivot A and guide wheel B, the rack of unmanned aerial vehicle is set up cable, the movable end of cable is connected card frame, card frame is set up clamping groove and V-groove, and the narrow mouth of V-groove is communicated with clamping groove;Pivot A is rotatably connected with card frame, pivot A is set up guide wheel A on, and card frame is set up the measuring assembly for measuring the rotation number of pivot A;Card frame is set up the lateral groove from side with V-groove conduction, guide wheel B is rotatably set in lateral groove, and drive mechanism for driving guide wheel B to rotate into V-groove is set in lateral groove, to be clamped by guide wheel B cooperation guide wheel A to electric wire.This utility model integrates unmanned aerial vehicle platform, winch vertical suspension mechanism, electromagnetic drive clamping mechanism and contact type photoelectric measuring mechanism, realizes the high-precision, high-safety remote automation measurement to high-voltage transmission line actual arc length.

Description

Technical Field

[0001] This utility model relates to the field of power engineering measurement technology, and in particular to a device for measuring the length of power transmission line overhead lines. Background Technology

[0002] In the construction, operation, and maintenance of power transmission lines, accurately measuring the actual length of the erected conductors is a crucial step, playing a key role in material calculation, sag verification, project acceptance, and subsequent line record management. Currently, commonly used measurement methods have the following limitations: traditional manual tape measure methods are inefficient, labor-intensive, and difficult to implement when traversing complex terrain, resulting in inconsistent accuracy; theoretical calculations based on design drawings cannot account for the actual sag and deformation of the conductors after erection, leading to significant deviations from the true length; and indirect measurement methods using geodetic instruments such as total stations are not only expensive and complex to operate, but their accuracy is also greatly affected by environmental visibility conditions, and the final result is a spatial projected distance rather than the actual curve length of the conductor itself.

[0003] In recent years, with the popularization of drone technology, schemes have emerged that attempt to use drones equipped with laser rangefinders for non-contact measurement. However, this method essentially measures the drone's own flight trajectory, not the actual conductor. Because high-voltage transmission lines exhibit a complex catenary curve in space and are affected by factors such as wind deflection, drones cannot accurately reproduce this path. Therefore, the conductor length calculated from spatial point coordinates has a large error and cannot meet engineering-grade accuracy requirements. Furthermore, the contradiction between equipment insulation safety and the reliability of non-contact measurement is particularly prominent when operating in high-voltage energized environments.

[0004] Therefore, there is an urgent need for a dedicated device that can safely, conveniently, directly, and with high precision measure the actual arc length of transmission lines. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a device for measuring the length of power transmission line overhead lines.

[0006] The technical solution of this utility model is as follows: A power transmission line length measuring device includes a drone. A cable is installed on the frame of the drone. The movable end of the cable is connected to a bracket. A slot and a V-shaped groove are provided on the bracket. The V-shaped groove is located below the slot, with the wide opening of the V-shaped groove facing downward and the narrow opening of the V-shaped groove communicating with the slot. A rotating shaft A is rotatably connected to the clamp holder, and the axial direction of the rotating shaft A is perpendicular to the length direction of the clamp slot. A guide wheel A is provided on the rotating shaft A, and a measuring component for measuring the number of rotations of the rotating shaft A is provided on the clamp holder. And guide wheel B, the card holder is provided with a side groove that is connected to the V-shaped groove from the side, guide wheel B is rotatably set in the side groove, and a drive mechanism is provided in the side groove to drive guide wheel B to rotate into the V-shaped groove, so that the wire is clamped by guide wheel B cooperating with guide wheel A.

[0007] Preferably, a winch is installed on the frame of the drone, and the cable is connected to the winding roller of the winch.

[0008] Preferably, the card holder is provided with a through hole that is conductively connected to the card slot, a viewing window is provided inside the through hole, a monitor is provided at the top of the card holder, and the probe of the monitor is inserted into the through hole.

[0009] Preferably, both guide wheel A and guide wheel B have V-shaped cross-sections.

[0010] Preferably, the measurement component includes an identification ring and a photoelectric encoder, and an electromagnetic shielding chamber is provided on the card holder; the identification ring is coaxially connected to one end of the rotating shaft A inserted into the electromagnetic shielding chamber, and a shielding cover A is provided inside the electromagnetic shielding chamber; the photoelectric encoder is located inside the shielding cover A, and the detection end of the photoelectric encoder faces the arc surface of the identification ring.

[0011] Preferably, a support shaft is provided in the side groove, the axial direction of the support shaft is parallel to the length direction of the slot, a movable plate is rotatably provided on the support shaft, a rotating shaft B is provided on the movable plate, the axial direction of the rotating shaft B is perpendicular to the axial direction of the support shaft, and the guide wheel B is coaxially connected to the rotating shaft B.

[0012] Preferably, the driving mechanism includes a slider and a driving assembly; an ear plate is provided on the movable plate, a connecting rod is rotatably provided on the ear plate, and a sliding sleeve that slides along its length is sleeved on the connecting rod; a shield B is provided in the side groove, and a slider that slides along its height is provided in the shield B; a pull rod is connected to the top of the slider, and one end of the pull rod that extends out of the shield B is connected to the sliding sleeve; the driving assembly is provided in the shield B, and the output end of the driving assembly is connected to the slider; and when the driving assembly is de-energized, the guide wheel B automatically rotates back into the side groove.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects: By employing drones for remote mounting and towing operations, physical isolation between the measuring device and ground personnel is achieved, completely avoiding the risks of personnel working at heights or coming into close contact with high-voltage lines. Furthermore, the device's critical measuring components are sealed within an electromagnetic shielding chamber, effectively resisting interference from high-voltage, strong electromagnetic fields. The mechanical clamping mechanism features a fail-safe design with automatic release upon power failure, ensuring the safety and reliability of the entire operation through multiple safeguards. The contact-type rolling measurement method, where guide wheels roll close to the conductor surface, directly converts the conductor's curve length into the number of rotations for measurement, fundamentally eliminating the inherent theoretical errors of indirect measurement methods. Combined with a high-resolution photoelectric encoder, engineering-grade precision measurements are achieved, yielding accurate and reliable results. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 A schematic diagram of the connection structure of the various components on the card holder; Figure 3 This is a schematic diagram of the connection structure between the guide wheel B and the drive mechanism.

[0015] Reference numerals: 1. Unmanned aerial vehicle (UAV); 2. Winch; 3. Cable; 4. Card holder; 41. Card slot; 42. V-groove; 43. Electromagnetic shielding chamber; 44. Side groove; 5. Monitor; 6. Rotating shaft A; 61. Identification ring; 7. Guide wheel A; 8. Shielding cover A; 9. Photoelectric encoder; 10. Support shaft; 11. Movable plate; 12. Rotating shaft B; 13. Guide wheel B; 14. Ear plate; 15. Connecting rod; 16. Sliding sleeve; 17. Shielding cover B; 18. Slider; 19. Pull rod; 20. Permanent magnet; 21. Electromagnet; 22. Spring. Detailed Implementation

[0016] Example 1, as Figures 1-3 As shown, the present invention proposes a power transmission line length measuring device, including a drone 1, a rotating shaft A6 and a guide wheel B13. A winch 2 is installed on the frame of the drone 1. A cable 3 is connected to the winding roller of the winch 2. The movable end of the cable 3 is connected to a clamp 4. The clamp 4 is provided with a clamp groove 41 and a V-shaped groove 42. The V-shaped groove 42 is located below the clamp groove 41, with the wide opening of the V-shaped groove 42 facing downwards and the narrow opening of the V-shaped groove 42 communicating with the clamp groove 41.

[0017] A rotating shaft A6 is rotatably connected to a clamping frame 4, and the axial direction of the rotating shaft A6 is perpendicular to the length direction of the clamping slot 41. A guide wheel A7 is mounted on the rotating shaft A6, and a measuring component for measuring the number of rotations of the rotating shaft A6 is mounted on the clamping frame 4. The measuring component includes an identification ring 61 and a photoelectric encoder 9. An electromagnetic shielding chamber 43 is mounted on the clamping frame 4. The identification ring 61 is coaxially connected to one end of the rotating shaft A6 that is inserted into the electromagnetic shielding chamber 43, and a shielding cover A8 is mounted inside the electromagnetic shielding chamber 43. The photoelectric encoder 9 is mounted inside the shielding cover A8, and the detection end of the photoelectric encoder 9 faces the arc surface of the identification ring 61.

[0018] The card holder 4 is provided with a side groove 44 that communicates with the V-shaped groove 42 from the side. A guide wheel B13 is rotatably disposed in the side groove 44. A support shaft 10 is disposed in the side groove 44. The axial direction of the support shaft 10 is parallel to the length direction of the card slot 41. A movable plate 11 is rotatably disposed on the support shaft 10. A rotating shaft B12 is disposed on the movable plate 11. The axial direction of the rotating shaft B12 is perpendicular to the axial direction of the support shaft 10. The guide wheel B13 is coaxially connected to the rotating shaft B12. A drive mechanism is provided in the side groove 44 to drive the guide wheel B13 into the V-shaped groove 42, so that the guide wheel B13 cooperates with the guide wheel A7 to clamp the wire. The drive mechanism includes a slider 18 and a drive assembly. An ear plate 14 is disposed on the movable plate 11. A connecting rod 15 is rotatably disposed on the ear plate 14. A sliding sleeve 16 that slides along the length direction is sleeved on the connecting rod 15. A shielding cover B17 is installed inside the side groove 44. A slider 18 that slides along its height direction is installed inside the shielding cover B17. A pull rod 19 is connected to the top of the slider 18. One end of the pull rod 19 extends out of the shielding cover B17 and is connected to the sliding sleeve 16. The driving components include, but are not limited to, a permanent magnet 20 and an electromagnet 21. The permanent magnet 20 is installed on the bottom surface of the slider 18, and the electromagnet 21 is installed on the bottom surface of the inner cavity of the shielding cover B17. The electromagnet 21 is directly opposite the permanent magnet 20. A spring 22 is installed inside the shielding cover B17. The bottom end of the spring 22 is connected to the bottom of the inner cavity of the shielding cover B17, and the top end of the spring 22 is connected to the bottom surface of the slider 18. When the electromagnet 21 is de-energized, the spring 22 pushes the slider 18 upward, thereby causing the guide wheel B13 to automatically rotate back into the side groove 44.

[0019] It should be noted that both guide wheels A7 and B13 have V-shaped cross-sections, and a wireless transceiver is installed on the card holder 4. Cable 3 is an electromagnetic interference resistant cable with built-in conductive cores, and the battery of UAV 1 is electrically connected to the various electrical components on the card holder 4 through cable 3.

[0020] In this embodiment, firstly, the operator controls the drone 1, carrying the cable holder 4, to fly directly above the target power line. Then, the winch 2 is activated to release the cable 3, allowing the cable holder 4 to descend smoothly under gravity. During this process, the cable holder 4 aligns its V-shaped groove 42 with the power line, allowing the power line to fall naturally into the slot 41. At this time, the guide wheel A7 is located below the power line, and its V-shaped profile is in contact with the power line.

[0021] When measurement is required, electromagnet 21 is energized. Electromagnet 21 generates a magnetic force that attracts permanent magnet 20, pulling slider 18 downward against the elastic force of spring 22. Slider 18, through a transmission mechanism consisting of pull rod 19, sliding sleeve 16, and connecting rod 15, pulls movable plate 11 to rotate around support shaft 10, thereby driving guide wheel B13 from side groove 44 into V-shaped groove 42. Guide wheel B13 and guide wheel A7 clamp the wire in the middle from both above and below, forming a stable three-point contact, ensuring sufficient friction between guide wheel A7 and the surface of the wire to prevent slippage.

[0022] After preparation, control the drone 1 to fly along the power line path. The drone 1 drags the entire card holder 4 along the power line via cable 3. During the sliding process, the guide wheel A7, which rolls close to the power line, drives the rotating shaft A6 to rotate synchronously. The identification ring 61, which is fixed coaxially with the rotating shaft A6, rotates within the electromagnetic shielding chamber 43. The photoelectric encoder 9, installed inside the shielding cover A8, accurately records the number of rotations of the rotating shaft A6 by non-contactly detecting the marks on the arc surface of the identification ring 61. The photoelectric encoder 9 transmits the data to the ground control station via the wireless transceiver on the card holder 4, or back to the drone 1 via the conductive core in the cable 3. The processor on the control station or drone 1 calculates the actual length of the line rolled over based on the preset circumference of the guide wheel A7, using the formula: Length = Number of rotations × Circumference of the contact area between the guide wheel A7 and the cable.

[0023] During the dragging process, the cable 3 with built-in conductive core not only undertakes the mechanical traction function, but also provides power to the electromagnet 21, photoelectric encoder 9 and wireless transceiver and other electrical components on the card holder 4.

[0024] After the measurement task is completed, the power supply to the electromagnet 21 is cut off. Under the restoring force of the spring 22, the slider 18 is pushed upward and drives the movable plate 11 to rotate through the transmission mechanism, causing the guide wheel B13 to automatically retract into the side groove 44, thereby releasing the clamping force on the wire. Finally, the winch 2 is operated to gather the cable 3, lift the clamp 4 and retrieve it to the drone 1, completing all operations.

[0025] Example 2, as Figure 1 and Figure 2 As shown, the present invention proposes a power transmission line length measuring device. Compared with the first embodiment, the card holder 4 is provided with a through hole that is conductively connected to the card slot 41. A viewing window is provided in the through hole. A monitor 5 is provided at the top of the card holder 4, and the probe of the monitor 5 is inserted into the through hole.

[0026] In this embodiment, the monitor 5 allows the operator on the bottom to release the card holder 4 at the correct position, so that the wire can enter the V-shaped groove 42 and be inserted into the card slot 41.

[0027] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A device for measuring the length of a power transmission line, characterized in that, include: A drone (1) is provided with a cable (3) on its frame. The movable end of the cable (3) is connected to a card holder (4). The card holder (4) is provided with a card slot (41) and a V-shaped groove (42). The V-shaped groove (42) is located below the card slot (41). The wide opening of the V-shaped groove (42) faces downward, and the narrow opening of the V-shaped groove (42) is connected to the card slot (41). A rotating shaft A (6) is rotatably connected to a card holder (4), and the axial direction of the rotating shaft A (6) is perpendicular to the length direction of the card slot (41). A guide wheel A (7) is provided on the rotating shaft A (6), and a measuring component for measuring the number of rotations of the rotating shaft A (6) is provided on the card holder (4). And guide wheel B (13), the card holder (4) is provided with a side groove (44) that is connected to the V-shaped groove (42) from the side, guide wheel B (13) is rotatably set in the side groove (44), and a drive mechanism is provided in the side groove (44) to drive guide wheel B (13) to rotate into the V-shaped groove (42) so that the wire can be clamped by guide wheel B (13) cooperating with guide wheel A (7).

2. The power transmission line length measuring device according to claim 1, characterized in that, A winch (2) is installed on the frame of the drone (1), and a cable (3) is connected to the winding roller of the winch (2).

3. The power transmission line length measuring device according to claim 1, characterized in that, The card holder (4) is provided with a through hole that is connected to the card slot (41). A viewing window is provided inside the through hole. A monitor (5) is provided at the top of the card holder (4). The probe of the monitor (5) is inserted into the through hole.

4. The power transmission line length measuring device according to claim 1, characterized in that, The cross-sections of guide wheel A (7) and guide wheel B (13) are both V-shaped.

5. The power transmission line length measuring device according to claim 1, characterized in that, The measuring components include an identification ring (61) and a photoelectric encoder (9). An electromagnetic shielding chamber (43) is provided on the card holder (4). The identification ring (61) is coaxially connected to one end of the rotating shaft A (6) inserted into the electromagnetic shielding chamber (43). A shielding cover A (8) is provided inside the electromagnetic shielding chamber (43). The photoelectric encoder (9) is provided inside the shielding cover A (8), and the detection end of the photoelectric encoder (9) faces the arc surface of the identification ring (61).

6. The power transmission line length measuring device according to claim 1, characterized in that, A support shaft (10) is provided in the side groove (44). The axial direction of the support shaft (10) is parallel to the length direction of the slot (41). A movable plate (11) is rotatably provided on the support shaft (10). A rotating shaft B (12) is provided on the movable plate (11). The axial direction of the rotating shaft B (12) is perpendicular to the axial direction of the support shaft (10). The guide wheel B (13) is coaxially connected to the rotating shaft B (12).

7. The power transmission line length measuring device according to claim 6, characterized in that, The driving mechanism includes a slider (18) and a driving assembly; an ear plate (14) is provided on the movable plate (11), a connecting rod (15) is rotatably provided on the ear plate (14), and a sliding sleeve (16) that slides along its length direction is sleeved on the connecting rod (15); a shielding cover B (17) is provided in the side groove (44), and a slider (18) that slides along its height direction is provided in the shielding cover B (17). A pull rod (19) is connected to the top of the slider (18), and one end of the pull rod (19) that extends out of the shielding cover B (17) is connected to the sliding sleeve (16). The driving assembly is provided in the shielding cover B (17), and the output end of the driving assembly is connected to the slider (18). When the driving assembly is de-energized, the guide wheel B (13) automatically rotates back into the side groove (44).

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