Lightning protection device for power transmission line

Abstract

The invention is suitable for the technical field of lightning protection, and provides a power transmission line lightning protection device which comprises a lightning protection device and an unmanned aerial vehicle hoisting and dismounting mechanism, the lightning protection device is installed at the high position of a power transmission line, connected with the ground and used for guiding lightning to the ground to achieve lightning protection, and the unmanned aerial vehicle hoisting and dismounting mechanism is installed on an unmanned aerial vehicle. The lightning protection device is disassembled and assembled; the lightning protection device comprises a round shell seat, a gravity center round seat and a main needle, an installation lug is fixedly installed on the outer side of the round shell seat, an installation hole used for installation is formed in the installation lug, and the gravity center round seat is detachably installed on the top of the round shell seat. According to the power transmission line lightning protection device provided by the scheme, the unmanned aerial vehicle is used for rapidly disassembling and assembling the lightning protection device, the unmanned aerial vehicle replaces manual high-altitude operation, the falling risk is avoided, the maintenance efficiency is improved, and the problem that a traditional lightning protection device is difficult to install and maintain at a high place is solved through combination of the unmanned aerial vehicle hoisting disassembling mechanism and the modularized lightning protection device.

Description

Technical Field

[0001] This invention belongs to the field of lightning protection technology, and particularly relates to a lightning protection device for power transmission lines. Background Technology

[0002] Transmission lines laid outdoors are susceptible to lightning strikes, which can cause damage to them. To protect overhead transmission lines from lightning, lightning protection devices are usually installed on the line towers.

[0003] Currently, lightning protection devices for power transmission lines are all bolted and installed at high locations. During long-term use, people need to maintain these devices. However, because the devices are installed at high locations, operators need to climb to high places for installation or maintenance, which is dangerous, inefficient, and troublesome. Summary of the Invention

[0004] This invention provides a lightning protection device for power transmission lines, aiming to solve the problem mentioned in the background art that the current lightning protection devices require manual disassembly and assembly and cannot be quickly maintained.

[0005] To solve the above problems, the present invention is implemented as follows: a lightning protection device for power transmission lines, comprising: a lightning protection device and a drone hoisting and dismantling mechanism. The lightning protection device is installed at a high point on the power transmission line and connected to the ground to guide lightning to the ground for lightning protection. The drone hoisting and dismantling mechanism is installed on a drone for assembling and disassembling the lightning protection device. The lightning protection device includes a circular shell base, a center-of-gravity circular base, and a main pin. The outer side of the circular shell base is fixedly equipped with mounting ears and mounting holes for installation. The center-of-gravity circular base is detachably installed on the top of the circular shell base. The main pin is fixedly installed on the top of the center-of-gravity circular base for attracting lightning. The top of the circular shell base has a circular interface, and the bottom of the center-of-gravity circular base is fixed... A hemispherical grounding docking block is fixedly installed. The hemispherical grounding docking block can be embedded into a circular shell base through a circular interface. A grounding docking seat is fixedly installed on the bottom inner wall of the circular shell base. The grounding docking seat is in close contact with the embedded hemispherical grounding docking block. A grounding down conductor is connected to the grounding docking seat. The grounding down conductor passes through the circular shell base and extends to the ground. A grounding plate is fixedly installed at the end located on the ground. A grounding nail is fixedly installed at the bottom of the grounding plate for insertion into the ground. The UAV hoisting and dismantling mechanism includes a hoisting insert plate for engaging or disengaging with the main pin, thereby hoisting the center of gravity circular base, the main pin, and the hemispherical grounding docking block, realizing the engagement or disengagement of the center of gravity circular base and the hemispherical grounding docking block from the circular shell base.

[0006] Preferably, the main pin, the center of gravity circular seat, the hemispherical grounding dock block, the grounding dock seat, the grounding down conductor, the grounding plate and the grounding nail are all made of conductive materials and are used to conduct lightning into the ground.

[0007] Preferably, the drone hoisting and dismantling mechanism further includes an extension plate, a storage sleeve plate, and a drone mounting plate. One side of the hoisting insert plate has a docking port for connecting with the main pin. The extension plate is fixedly installed on the other side of the hoisting insert plate away from the docking port. The storage sleeve plate is slidably fitted over the extension plate for storing the extension plate. The drone mounting plate is fixedly installed on the storage sleeve plate for connecting with the drone. A length-fixing bolt is installed on the storage sleeve plate, with its end abutting against the extension plate to fix the length of the extension plate on the storage sleeve plate.

[0008] Preferably, both the circular shell base and the grounding dock are provided with insertion holes. One end of the grounding down conductor is inserted into the insertion hole on the grounding dock through the insertion hole on the circular shell base. A sliding opening is provided on one side of the inner wall of the insertion hole on the grounding dock. A pressure block is slidably installed in the sliding opening. A pressure bolt is threaded on one side of the inner wall of the sliding opening. One end of the pressure bolt is rotatably connected to the pressure block, and the other end is located outside the grounding dock, so that when the pressure bolt rotates, it moves between the grounding dock and the sliding opening, thereby driving the pressure block to slide in the sliding opening, realizing the fixing and unlocking of the grounding down conductor.

[0009] Preferably, an operating port corresponding to the position of the pressure bolt is provided on one side of the circular shell base, and a sealing plate is detachably installed on the outer side of the circular shell base by bolts to close the operating port.

[0010] Preferably, the top of the center of gravity circular seat is fixedly mounted with multiple auxiliary needles arranged around the main needle. The multiple auxiliary needles are all inclined and their height is lower than that of the main needle. The top of the multiple auxiliary needles is fixedly mounted with the same dynamic equalizing ring, which is located outside the main needle. A connecting sleeve is fixedly sleeved on the main needle. Horizontal pull rods are fixedly mounted in the middle sections of the multiple auxiliary needles, and the multiple horizontal pull rods are fixedly connected to the connecting sleeves.

[0011] Preferably, multiple support rods are fixedly installed on the top of the circular shell base. All of the support rods are inclined, and the top of the multiple support rods is fixedly installed with the same docking and straightening ring. The diameter of the circle formed by the bottom ends of the multiple support rods is equal to the diameter of the center of gravity circular base. The inner side of the docking and straightening ring is in contact with the outer side of the multiple auxiliary pins. The support rods and the docking and straightening ring are used for the correct insertion and straightening of the lightning protection device when it is placed.

[0012] Preferably, the pressure block has an arc-shaped groove on one side of the grounding lead, and anti-slip protrusions are fixedly installed on the inner wall of the arc-shaped groove.

[0013] Preferably, the top of the grounding dock has a docking arc groove, and after the hemispherical grounding dock is docked with the grounding dock, its bottom is precisely embedded in the docking arc groove.

[0014] Preferably, the main needle and the multiple auxiliary needles are all fitted with ceramic sleeves, and the ceramic sleeves of the auxiliary needles are in contact with the inner side of the docking and straightening ring.

[0015] Compared with related technologies, the power transmission line lightning protection device provided by the present invention has the following beneficial effects: Compared with existing technologies, the lightning protection device for power transmission lines provided in this solution is a lightning protection device that can be quickly installed and dismantled using drones. Drones replace manual high-altitude operations, avoiding the risk of falls and improving maintenance efficiency. The combination of drone hoisting and dismantling mechanism and modular lightning protection device solves the problem of difficult installation and maintenance of traditional lightning protection devices at high altitudes. Attached Figure Description

[0016] Figure 1 This is a front-view top-view three-dimensional structural diagram of a lightning protection device for power transmission lines provided by the present invention; Figure 2 for Figure 1 A top-view three-dimensional structural diagram of the other side; Figure 3 This is a schematic diagram of the main sectional view of a lightning protection device for power transmission lines provided by the present invention; Figure 4 for Figure 3 An enlarged structural diagram of part A shown in the figure; Figure 5 for Figure 4 An enlarged structural diagram of part B shown in the figure; Figure 6 for Figure 3 An enlarged structural diagram of section C shown in the figure; Figure 7 for Figure 6 An enlarged structural diagram of part D shown in the figure; Figure 8 This is a top-view three-dimensional structural diagram of the circular shell base section; Figure 9 A bottom-view three-dimensional structural diagram of the lightning protection device after removing the circular shell base; Figure 10 A top-view 3D structural diagram of the drone hoisting and dismantling mechanism; Figure 11 A top-view three-dimensional structural diagram of the lifting force-receiving unlocking mechanism; Figure 12 for Figure 11 The diagram shown is a top-view three-dimensional structure after the protective cylinder has been removed. Figure 13 A top-view three-dimensional structural diagram of the hoisting insert plate and the hoisting anti-detachment mechanism above it; Figure 14 for Figure 13 A top-view three-dimensional structural diagram of the other side; Figure 15 for Figure 13 The diagram shown is a bottom-view three-dimensional structure diagram; Figure 16 A top-down 3D structural diagram of a drone hoisting and dismantling mechanism mounted on a drone.

[0017] Reference numerals: 1. Round shell base; 2. Mounting ear; 3. Center of gravity round base; 4. Main pin; 5. Circular mating interface; 6. Hemispherical grounding mating block; 7. Grounding mating seat; 8. Grounding lead-down wire; 9. Grounding plate; 10. Grounding nail; 11. Lifting insert plate; 12. Butt joint; 13. Extension plate; 14. Storage sleeve plate; 15. UAV mounting plate; 16. Fixed length bolt; 17. Wire insertion hole; 18. Sliding port; 19. Wire pressing block; 20. Wire pressing bolt; 21. Operating port; 22. Sealing plate; 23. Secondary pin; 24. Dynamic equalizing ring; 25. Connecting sleeve; 26. Horizontal tie rod; 27. Support rod; 28. Butt straightening ring; 29. ​​Receiving groove; 30. Movable groove; 31. Intermediate block; 32. Sliding round rod; 33. Outward expansion spring; 34. Self-locking sliding plate; 5. Self-locking insert plate; 36. Sleeve cylinder; 37. Lower retaining ring; 38. Upper retaining ring; 39. Lower limit ring; 40. Protective cylinder; 41. Upper limit ring; 42. Return spring; 43. Pull rope; 44. Secondary rope; 45. Guide rope rod; 46. Guide rope wheel; 47. Drain hole; 48. Anti-fall strip plate; 49. Assembly plate; 50. Rotating shaft; 51. Moving plate gear; 52. Gear assembly; 53. Lifting slide; 54. Rack plate; 55. Press trigger plate; 56. Compression port; 57. Return spring; 58. Rotation port; 59. Gear shaft; 60. Conical gear disc; 61. Shaft plate; 62. Transmission shaft one; 63. Transmission shaft two; 64. Conical gear one; 65. Conical gear two; 66. Sprocket; 67. Chain; 68. Limiting guide groove; 69. Limiting guide block. Detailed Implementation

[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] This invention provides a lightning protection device for power transmission lines, such as... Figure 1-16As shown, the power transmission line lightning protection device includes: a lightning protection device and a drone hoisting and dismantling mechanism. The lightning protection device is installed at a high point on the power transmission line and connected to the ground to guide lightning to the ground for lightning protection. The drone hoisting and dismantling mechanism is installed on a drone for assembling and dismantling the lightning protection device. The lightning protection device includes a circular shell base 1, a center-of-gravity circular base 3, and a main pin 4. A mounting ear 2 is fixedly installed on the outer side of the circular shell base 1, and it has mounting holes for installation. The center-of-gravity circular base 3 is detachably installed on the top of the circular shell base 1. The main pin 4 is fixedly installed on the top of the center-of-gravity circular base 3 for guiding lightning. A circular interface 5 is opened on the top of the circular shell base 1, and a hemispherical grounding docking block 6 is fixedly installed on the bottom of the center-of-gravity circular base 3. The hemispherical grounding docking block 6 can be embedded into the circular shell base 1 through the circular docking interface 5. A grounding docking seat 7 is fixedly installed on the bottom inner wall of the circular shell base 1. The grounding docking seat 7 is in close contact with the embedded hemispherical grounding docking block 6. A grounding down conductor 8 is connected to the grounding docking seat 7. The grounding down conductor 8 passes through the circular shell base 1 and extends to the ground. A grounding plate 9 is fixedly installed at one end located on the ground. A grounding nail 10 is fixedly installed at the bottom of the grounding plate 9 for insertion into the ground. The UAV hoisting and dismantling mechanism includes a hoisting insert plate 11 for engaging or disengaging with the main pin 4, thereby hoisting the center of gravity circular base 3, the main pin 4, and the hemispherical grounding docking block 6, realizing the engagement or disengagement of the center of gravity circular base 3 and the hemispherical grounding docking block 6 with the circular shell base 1.

[0020] In this embodiment, during the installation of the lightning protection device, the circular shell base 1 is fixed to a high position on the transmission line tower using the mounting ears 2 and mounting holes to ensure its stability. Then, the hemispherical grounding docking block 6 is embedded into the circular interface 5 of the circular shell base 1, ensuring close contact between the hemispherical grounding docking block 6 and the grounding docking seat 7, forming an electrical connection. At this point, the bottom of the center-of-gravity circular base 3 is tightly fitted against the top of the circular shell base 1. Afterwards, the grounding down conductor 8 is connected to the grounding docking seat 7, and the grounding plate 9 at the other end is inserted into the ground using grounding nails 10, completing the grounding system construction.

[0021] During use, lightning strikes are guided to the ground through the main pin 4, the center of gravity circular seat 3, the hemispherical grounding dock 6, the grounding dock 7, the grounding down conductor 8, the grounding plate 9, and the grounding nail 10.

[0022] During use, when maintenance and dismantling of the lightning protection device are required: use a drone to suspend the drone hoisting and dismantling mechanism, connect the main pin 4 through the hoisting plate 11, and then lift the drone upward to lift the center of gravity round seat 3 and the hemispherical grounding docking block 6, so that it is separated from the round shell seat 1.

[0023] During reinstallation, drones are also used for transportation, allowing the center of gravity circular base 3 and the hemispherical grounding docking block 6 to connect with the circular shell base 1, restoring the function of the lightning protection device.

[0024] During regular inspections of this lightning protection device, drones are used to replace manual high-altitude operations, avoiding the risk of falls and improving maintenance efficiency. The hemispherical docking structure between the center-of-gravity circular base 3 and the circular shell base 1 is relatively simple and easier to connect. With the center of gravity on the center-of-gravity circular base 3, it is easier to maintain balance during hoisting and docking. The grounding down conductor 8, grounding plate 9, and grounding nail 10 ensure that lightning current is conducted to the ground.

[0025] By combining the drone-based hoisting and dismantling mechanism with the modular lightning protection device, the problem of difficult installation and maintenance of traditional lightning protection devices at high altitudes has been solved, significantly improving the lightning protection safety and operation and maintenance efficiency of transmission lines, and demonstrating significant technological progress and application value.

[0026] In a further preferred embodiment of the present invention, the main pin 4, the center of gravity circular seat 3, the hemispherical grounding docking block 6, the grounding docking seat 7, the grounding down conductor 8, the grounding plate 9, and the ground nail 10 are all made of conductive materials and are used to conduct lightning into the ground.

[0027] In this embodiment, the key components of the lightning protection device are all designed with conductive materials, including the main pin 4, the center-of-gravity circular base 3, the hemispherical grounding dock 6, the grounding dock 7, the grounding down conductor 8, the grounding plate 9, and the grounding nail 10. The main pin 4 serves as the lightning conductor and is connected to the hemispherical grounding dock 6 through the center-of-gravity circular base 3. The hemispherical docking structure ensures the reliability and stability of electrical contact. The grounding dock 7 and the hemispherical grounding dock 6 are tightly fitted to form a conductive path. The grounding down conductor 8 conducts the current to the grounding plate 9, and finally leads it to the ground through the grounding nail 10, realizing a complete closed loop of lightning protection.

[0028] The center of gravity circular base 3 and the circular shell base 1 are quickly connected by embedding the hemispherical grounding docking block 6 into the circular docking interface 5. Combined with the mechanical coupling of the drone hoisting insert plate 11 and the main pin 4, the unmanned disassembly and assembly of the lightning protection device is realized, which significantly improves the operation and maintenance efficiency, realizes the automation and safety of high-altitude operations, replaces the traditional manual climbing operation, and avoids the risk of falling.

[0029] In a further preferred embodiment of the present invention, the drone hoisting and dismantling mechanism further includes an extension plate 13, a storage sleeve 14, and a drone mounting plate 15. A docking port 12 is provided on one side of the hoisting insert plate 11 for docking with the main pin 4. The extension plate 13 is fixedly installed on the other side of the hoisting insert plate 11 away from the docking port 12. The storage sleeve 14 is slidably sleeved on the extension plate 13 for storing the extension plate 13. The drone mounting plate 15 is fixedly installed on the storage sleeve 14 for connecting with the drone. A length-fixing bolt 16 is installed on the storage sleeve 14, and the end of the length-fixing bolt 16 abuts against the extension plate 13 to fix the length of the extension plate 13 on the storage sleeve 14.

[0030] In this embodiment, the drone hoisting and dismantling mechanism includes a hoisting insert plate 11, an extension plate 13, a storage sleeve plate 14, and a drone mounting plate 15. A docking port 12 is provided on one side of the hoisting insert plate 11 for precise docking with the main pin 4 of the lightning protection device; the extension plate 13 is fixed to the other side of the hoisting insert plate 11 and its length is adjusted by sliding and nesting within the storage sleeve plate 14; a fixed-length bolt 16 is installed on the storage sleeve plate 14 to fix the extension length of the extension plate 13; the drone mounting plate 15 is fixed to the top of the storage sleeve plate 14 for connection with the drone fuselage, forming a complete hoisting system.

[0031] The length of the hoisting insert plate 11 can be adjusted by the sliding fit between the extension plate 13 and the storage sleeve plate 14, combined with the mechanical fixing of the fixed length bolt 16.

[0032] The drone carries the device to the target location and couples it with the main pin 4 through the docking port 12 of the hoisting plate 11. The drone's lifting force is used to lift the center of gravity circular seat 3 and the hemispherical grounding docking block 6, thereby achieving the separation or docking of the lightning protection device.

[0033] Drones replace manual high-altitude operations, eliminating the risk of falls; their telescopic structures reduce the risk of collisions due to distance errors, improving safety during assembly and disassembly. Drone-assisted collaborative operations reduce manual labor, and modular components facilitate rapid replacement and maintenance, lowering long-term operating costs.

[0034] In a further preferred embodiment of the present invention, both the circular shell base 1 and the grounding dock 7 are provided with insertion holes 17. One end of the grounding lead 8 is inserted into the insertion hole 17 on the grounding dock 7 through the insertion hole 17 on the circular shell base 1. A sliding opening 18 is provided on one side of the inner wall of the insertion hole 17 on the grounding dock 7. A pressure block 19 is slidably installed in the sliding opening 18. A pressure bolt 20 is threaded on one side of the inner wall of the sliding opening 18. One end of the pressure bolt 20 is rotatably connected to the pressure block 19, and the other end is located outside the grounding dock 7, so that when the pressure bolt 20 rotates, it moves within the grounding dock 7 and the sliding opening 18, thereby driving the pressure block 19 to slide within the sliding opening 18, thereby fixing and unlocking the grounding lead 8.

[0035] In this embodiment, both the circular shell base 1 and the grounding dock 7 have insertion holes 17 for inserting the grounding down conductor 8. One end of the grounding down conductor 8 extends through the insertion hole 17 of the circular shell base 1 into the insertion hole 17 of the grounding dock 7 to achieve electrical connection. A sliding opening 18 is provided on the inner wall of one side of the insertion hole 17 of the grounding dock 7, and a clamping block 19 is provided inside. The clamping block 19 is driven to slide by the clamping bolt 20 to clamp and fix or unlock the grounding down conductor 8.

[0036] The grounding lead 8 is directly inserted through the insertion hole 17. The rotating connection design between the pressure bolt 20 and the pressure block 19 allows the pressure block 19 to slide linearly within the sliding port 18, achieving reliable fixation of the grounding lead 8 through mechanical clamping force.

[0037] To unlock, simply rotate the wire clamping bolt 20 in the opposite direction to release the wire clamping block 19, which facilitates the replacement or maintenance of the grounding lead 8 and extends the service life of the equipment.

[0038] In a further preferred embodiment of the present invention, an operating port 21 corresponding to the position of the pressure bolt 20 is provided on one side of the circular shell base 1, and a sealing plate 22 is detachably installed on the outer side of the circular shell base 1 by bolts to close the operating port 21.

[0039] In this embodiment, an operating port 21 is provided on one side of the circular shell base 1, and its position corresponds to the pressure bolt 20, so as to facilitate the rotation operation of the pressure bolt 20 through the operating port 21. A sealing plate 22 is detachably installed on the outside of the circular shell base 1 by bolts, which is used to seal the operating port 21 after the operation is completed, to prevent external environment such as rainwater and dust from entering the internal structure, and to ensure the long-term reliability of the pressure bolt 20 and the pressure block 19 in the sliding port 18.

[0040] In a further preferred embodiment of the present invention, a plurality of auxiliary needles 23 are fixedly installed on the top of the center of gravity circular seat 3, which are arranged around the main needle 4. The plurality of auxiliary needles 23 are all inclined and the height of the auxiliary needles 23 is lower than that of the main needle 4. The top of the plurality of auxiliary needles 23 is fixedly installed with the same dynamic equalizing ring 24. The dynamic equalizing ring 24 is located outside the main needle 4. A connecting sleeve 25 is fixedly sleeved on the main needle 4. A horizontal pull rod 26 is fixedly installed in the middle section of the plurality of auxiliary needles 23. The plurality of horizontal pull rods 26 are fixedly connected to the connecting sleeve 25.

[0041] In this embodiment, multiple inclined auxiliary needles 23 are fixedly installed on the top of the center of gravity circular base 3, evenly distributed around the main needle 4, and the height of the auxiliary needles 23 is lower than that of the main needle 4. The tops of the multiple auxiliary needles 23 are connected by a dynamic pressure equalizing ring 24 to form a ring-shaped pressure equalizing structure; a connecting sleeve 25 is fixedly sleeved on the main needle 4, and the middle section of the auxiliary needles 23 is rigidly connected to the connecting sleeve 25 by a horizontal tie rod 26, realizing the mechanical coordination and electrical coupling between the auxiliary needles 23 and the main needle 4.

[0042] The dynamic equalizing ring 24 forms a three-dimensional electric field distribution network with the main needle 4 through the auxiliary needle 23. The ring structure is used to balance the potential difference under lightning impact, reduce the local electric field intensity, and suppress the risk of corona discharge and flashover.

[0043] The horizontal tie rod 26 rigidly connects the middle section of the auxiliary needle 23 to the connecting sleeve 25 of the main needle 4, forming a triangular support structure, which enhances the wind pressure resistance and bending resistance of the auxiliary needle 23 and ensures structural stability under extreme weather conditions.

[0044] The main needle 4 serves as the primary lightning interception point, and the secondary needle 23 serves as the secondary lightning interception point. Through the inclined layout and the synergy of the dynamic equalization ring 24, the lightning interception range is expanded and the probability of lightning stalking is reduced.

[0045] In a further preferred embodiment of the present invention, a plurality of support rods 27 are fixedly installed on the top of the circular shell base 1. The plurality of support rods 27 are all inclined. The top of the plurality of support rods 27 is fixedly installed with the same docking and straightening ring 28. The diameter of the circle formed by the bottom ends of the plurality of support rods 27 is equal to the diameter of the center of gravity circular base 3. The inner side of the docking and straightening ring 28 is in contact with the outer side of the plurality of auxiliary pins 23. The support rods 27 and the docking and straightening ring 28 are used for correct insertion and straightening when the lightning protection device is placed.

[0046] In this embodiment, multiple inclined support rods 27 are fixedly installed on the top of the circular shell base 1, and their top ends collectively support the docking and straightening ring 28. The diameter of the circle formed by the bottom ends of the multiple support rods 27 is equal to the diameter of the center of gravity circular base 3. The inner side of the docking and straightening ring 28 is in close contact with the outer side of the auxiliary pin 23, forming the guiding and straightening structure of the lightning protection device. When the lightning protection device is hoisted, the docking and straightening ring 28, guided by the auxiliary pin 23, accurately positions the center of gravity circular base 3 above the circular shell base 1, achieving rapid docking.

[0047] The combined structure of the alignment ring 28 and the support rod 27 utilizes the inclined layout of the auxiliary pin 23 as a guide rail to automatically correct the offset during the descent of the lightning protection device, ensuring the precise docking of the main pin 4 and the round shell base 1.

[0048] In a further preferred embodiment of the present invention, the pressure block 19 has an arc-shaped groove on one side of the grounding lead 8, and anti-slip protrusions are fixedly installed on the inner wall of the arc-shaped groove.

[0049] In this embodiment, the side of the pressure block 19 that contacts the grounding lead 8 is designed with an arc-shaped groove structure. The inner wall of the arc-shaped groove is fitted with a friction-enhancing layer formed by a fixed anti-slip texture, such as a toothed or mesh-like pattern. When the pressure bolt 20 drives the pressure block 19 to slide, the combination of the arc-shaped groove and the anti-slip texture creates a mechanical engagement between the pressure block 19 and the grounding lead 8, achieving a stable clamping of the grounding lead 8.

[0050] In a further preferred embodiment of the present invention, the top of the grounding dock 7 has a docking arc groove, and after the hemispherical grounding dock 6 docks with the grounding dock 7, its bottom is precisely embedded in the docking arc groove.

[0051] In this embodiment, the top of the grounding dock 7 is designed as a docking arc groove structure, the curvature of which matches the bottom of the hemispherical grounding dock 6. When the hemispherical grounding dock 6 docks with the grounding dock 7, the bottom of the hemispherical grounding dock 6 is precisely embedded in the docking arc groove, forming a surface-to-surface contact conductive path, replacing the traditional point-to-surface contact method, and significantly improving the conductivity and mechanical stability of the grounding system.

[0052] In a further preferred embodiment of the present invention, the main needle 4 and the multiple auxiliary needles 23 are all covered with ceramic cylinders, and the ceramic cylinders of the auxiliary needles 23 are in contact with the inner side of the docking and straightening ring 28.

[0053] In this embodiment, the main needle 4 and multiple auxiliary needles 23 are all covered with ceramic sleeves, which are made of highly insulating and weather-resistant materials such as alumina ceramic. The outer surface of the ceramic sleeve of the auxiliary needle 23 is in direct contact with the inner side of the docking and straightening ring 28, forming a dual function of mechanical support and electrical insulation.

[0054] To further improve the performance of this device, in addition to the above-mentioned solutions, this solution also includes the following embodiments: In another embodiment of the present invention, a pull-wire unlocking mechanism is provided on the center of gravity circular base 3 and the hemispherical grounding docking block 6, and a lifting pair force-receiving unlocking mechanism is provided on the main pin 4. The pull-wire unlocking mechanism is connected to the lifting pair force-receiving unlocking mechanism, and the lifting pair force-receiving unlocking mechanism is correspondingly arranged with the lifting plate 11, so that the UAV controls the pull-wire unlocking mechanism after connecting the lifting plate 11 with the lifting pair force-receiving unlocking mechanism, thereby realizing the fixing or unlocking of the center of gravity circular base 3 and the hemispherical grounding docking block 6 with the circular shell base 1. The pull-wire unlocking mechanism includes a mechanism formed on the hemispherical base 1. The shaped grounding docking block 6 has a receiving groove 29 on its top and a movable groove 30 on its bottom. The receiving groove 29 and the movable groove 30 are correspondingly arranged. A middle block 31 is fixedly installed at the top center of the movable groove 30. Sliding round rods 32 are fixedly installed on at least two sides of the middle block 31. The other end of the sliding round rods 32 is fixedly connected to the inner wall of the movable groove 30. An outward expansion spring 33 and a self-locking slide plate 34 are slidably sleeved on the sliding round rods 32. The outward expansion spring 33 is located between the middle block 31 and the self-locking slide plate 34. The bottom extends into the receiving groove 29 and is fixedly installed with a self-locking insert plate 35. The self-locking insert plate 35 slides through the wall of the hemispherical grounding dock 6. The self-locking insert plate 35 can be controlled to be retracted into the hemispherical grounding dock 6 or extended to the outside by the sliding of the self-locking slide plate 34. After the hemispherical grounding dock 6 is docked with the grounding dock 7, the self-locking insert plate 35 slides out of the hemispherical grounding dock 6, so that the tops of the multiple self-locking insert plates 35 all abut against the top inner wall of the round shell base 1. At this time, the center of gravity round base 3 is located at the top of the round shell base 1, and together with the above structure, docking is achieved. After fixing, a pull rope 43 is slidably installed on the intermediate block 31 and the center of gravity circular seat 3. The top end of the pull rope 43 extends to the outside of the center of gravity circular seat 3 and is located on the side of the main needle 4. A secondary rope 44 is fixedly installed on the self-locking slide plate 34. The secondary rope 44 is fixedly connected to the bottom end of the pull rope 43 so that when the pull rope 43 is pulled upward, the secondary rope 44 is tightened, thereby controlling the sliding of the self-locking slide plate 34, so that the self-locking insert plate 35 is retracted into the hemispherical grounding docking block 6. Conversely, under the rebound of the outward expansion spring 33, the self-locking insert plate 35 slides out of the hemispherical grounding docking block 6.

[0055] In this embodiment, a pull-wire unlocking mechanism is integrated on the center of gravity circular base 3 and the hemispherical grounding docking block 6, and is linked with the lifting pair force-receiving unlocking mechanism of the main pin 4. The lifting plate 11 is connected to the lifting pair force-receiving unlocking mechanism via a drone control system, triggering the pull rope 43 to move, thereby controlling the pull-wire unlocking mechanism to fix or unlock the center of gravity circular base 3 and the hemispherical grounding docking block 6 to the circular shell base 1. Specifically, the hemispherical grounding docking block 6 has a receiving groove 29 at its top, and the center of gravity circular base 3 has a movable groove 30 at its bottom. The middle block 31 supports the self-locking slide plate 34 via a sliding rod 32. The outward-expanding spring 33 drives the self-locking slide plate 34 to move the self-locking insert plate 35 into the inner wall of the circular shell base 1 for fixation. The pull rope 43 is linked with the auxiliary rope 44, and by pulling upwards, the self-locking insert plate 35 retracts, achieving unlocking.

[0056] The combination of the outward expansion spring 33 and the self-locking slide plate 34 enables the self-locking insert plate 35 to automatically pop out and insert into the round shell seat 1 during docking, and to be forcibly contracted by the pull rope 43 during unlocking, thus achieving bidirectional control of fixing and releasing.

[0057] The self-locking insert plate 35 slides through the wall of the hemispherical grounding docking block 6 and only slides out after docking, avoiding accidental triggering before transportation or installation; the linkage path of the pull rope 43 and the auxiliary rope 44 is hidden inside the center of gravity circular seat 3 to prevent external interference.

[0058] In another embodiment of the present invention, the lifting force-receiving unlocking mechanism includes a sleeve cylinder 36 slidably sleeved on the main pin 4. The diameter of the sleeve cylinder 36 is less than or equal to the opening width of the docking port 12. The insertion side of the docking port 12 is extended outward. A lower retaining ring 37 and an upper retaining ring 38 are fixedly sleeved on the sleeve cylinder 36. The lower retaining ring 37 is fixedly connected to the top end of the pulling rope 43, so that when the drone moves the lifting plate 11 upward, it will lift the sleeve cylinder 36, the lower retaining ring 37 and the upper retaining ring 38 as a whole along the main pin 4, thereby pulling the pulling rope 43. The spacing between the rings 38 is greater than twice the thickness of the lifting plate 11. A lower limit ring 39 and an upper limit ring 41 are fixedly sleeved on the main needle 4. The lower limit ring 39 and the upper limit ring 41 are located below and above the sleeve cylinder 36, respectively, to limit the sliding range of the sleeve cylinder 36. A protective cylinder 40 is fixedly installed on the top of the upper retaining ring 38. The protective cylinder 40 is slidably sleeved outside the upper limit ring 41. A return spring 42 is provided inside the protective cylinder 40 and sleeved outside the main needle 4. The bottom end of the return spring 42 abuts against the top end of the sleeve cylinder 36, and the top end abuts against the bottom of the upper limit ring 41.

[0059] In this embodiment, the lifting force-receiving unlocking mechanism achieves drone-driven mechanical linkage through a sleeve cylinder 36 slidably fitted onto the main pin 4. The diameter of the sleeve cylinder 36 is less than or equal to the width of the docking port 12, and a lower retaining ring 37 and an upper retaining ring 38 are fixedly fitted onto it. The lower retaining ring 37 is connected to the top of the pulling rope 43. When the drone moves the lifting plate 11 upward, it causes the sleeve cylinder 36 to slide along the main pin 4, thereby pulling the pulling rope 43 to trigger unlocking. The lower limit ring 39 and the upper limit ring 41 limit the stroke of the sleeve cylinder 36, and the return spring 42 inside the protective cylinder 40 drives the sleeve cylinder 36 to reset after unlocking, forming a self-locking-unlocking cycle mechanism.

[0060] The lifting plate 11 is inserted into the extended side of the docking port 12 and then connected to the sleeve cylinder 36. The lifting plate 11 is then raised using a drone-controlled system, rising along the sleeve cylinder 36 until it contacts the upper retaining ring 38. During this continued ascent, the upper retaining ring 38 causes the sleeve cylinder 36 and the lower retaining ring 37 to slide upwards, pulling the traction rope 43. This causes the self-locking slide plate 34 to slide along the corresponding sliding rod 32 and compress the outward expansion spring 33, unlocking the self-locking plate 35. The self-locking plate 35 continues until it is fully retracted into the hemispherical grounding docking block 6. At this point, the hemispherical grounding docking block 6 can detach from the circular shell base 1, thus completing the lifting operation.

[0061] During docking, only the height of the drone below is needed. When the hemispherical grounding docking block 6 is re-embedded into the grounding docking seat 7 inside the round shell seat 1, as it continues to be lowered, the lifting plate 11 reduces the lifting force on the upper retaining ring 38. Under the rebound of the outward expansion spring 33 and the return spring 42, each part resets, the pulling rope 43 gradually loses its tension, and the self-locking plate 35 pops out of the hemispherical grounding docking block 6 again. The top of the self-locking plate 35 re-contacts the top inner wall of the round shell seat 1, completing the docking self-locking.

[0062] The lower limit ring 39 and the upper limit ring 41 precisely control the sliding range of the sleeve cylinder 36 to prevent excessive stretching of the traction rope 43; the return spring 42 automatically pushes the sleeve cylinder 36 to reset after the drone releases the hoisting plate 11, reducing the need for manual intervention.

[0063] The protective sleeve 40 is slidably sleeved outside the upper limit ring 41 to isolate the return spring 42 from environmental factors such as rainwater and dust, thus extending the service life of the mechanism.

[0064] The drone-driven mechanical linkage eliminates the need for operators to contact high-voltage equipment, reducing the risk of electric shock; the expansion side of the hoisting plate 11 and the docking port 12 cooperate to improve the docking rate.

[0065] In another embodiment of the present invention, a guide rod 45 is fixedly installed in the receiving groove 29 to guide the corresponding auxiliary rope 44 to slide, and a guide wheel 46 is provided on the top of the center of gravity circular seat 3 to guide the sliding of the pulling rope 43.

[0066] In this embodiment, a guide rod 45 is added and fixedly installed in the receiving groove 29 to guide the sliding path of the auxiliary rope 44; at the same time, a guide wheel 46 is provided on the top of the center of gravity circular seat 3 to guide the sliding path of the pulling rope 43.

[0067] In another embodiment of the present invention, the edges of the lower retaining ring 37 and the upper retaining ring 38 are both bent outward to guide the insertion of the mounting plate 11 into the docking port 12. The upper retaining ring 38 is provided with a plurality of drainage holes 47.

[0068] In this embodiment, the lower retaining ring 37 and the upper retaining ring 38 are specially designed to meet the docking requirements of the lifting plate 11. Specifically, the edges of both the lower retaining ring 37 and the upper retaining ring 38 are designed with outward bending, and this unique structure forms a guiding mechanism. When the docking port 12 of the lifting plate 11 is inserted, the bent edges can act as a guide, making the docking process smoother and more accurate, and avoiding problems such as insertion difficulties or damage caused by positional deviations. At the same time, the upper retaining ring 38 is also provided with multiple drainage holes 47, which provides a solution for possible drainage needs in the future.

[0069] In another embodiment of the present invention, the lifting plate 11 is provided with a lifting anti-detachment mechanism. The lifting anti-detachment mechanism includes anti-detachment strips 48 that are slidably installed on both sides of the docking port 12. Both anti-detachment strips 48 are inclined. When the two anti-detachment strips 48 are docked, they form a surround with the inner wall of the docking port 12 to prevent the sleeve cylinder 36 from falling off during lifting. When the two anti-detachment strips 48 are separated, they are retracted into the inner wall of the docking port 12 to prevent interference with docking. The contact surfaces of the two anti-detachment strips 48 and the sleeve cylinder 36 are smooth surfaces. Assembly plates 49 are fixedly installed on both sides of the two anti-detachment strips 48 on the lifting plate 11. Both assembly plates 49 are rotatable. Two rotating shafts 50 are installed, and each of the two rotating shafts 50 is fixedly fitted with a shifting plate gear 51. On the other side of each of the two anti-drop strip plates 48 that does not contact the sleeve cylinder 36, a toothed gear set 52 is fixedly installed. The two shifting plate gears 51 mesh with the two toothed gear sets 52 respectively. The two rotating shafts 50 rotate synchronously, thereby driving the two anti-drop strip plates 48 to slide synchronously. A lifting slide 53 is provided on the hoisting insert 11. A rack plate 54 is slidably installed in the lifting slide 53. A pressing trigger plate 55 is fixedly installed on the top of the rack plate 54. The pressing trigger plate 55 is located above the hoisting insert 11 and extends to below the upper retaining ring 38, for use by a drone to carry the hoisting insert 11. When raised, it abuts against the bottom of the upper retaining ring 38, causing the rack plate 54 to slide downwards. The top of the lifting insert plate 11 has a compression port 56, and a return spring 57 is fixedly installed inside the compression port 56. The top of the return spring 57 is fixedly connected to the bottom of the pressing trigger plate 55, used to control the reset of the pressing trigger plate 55 and the rack plate 54. A rotating port 58 is opened on the inner wall of the lifting slide port 53, and a gear shaft 59 is rotatably installed inside the rotating port 58. The gear shaft 59 meshes with the rack plate 54, so that the rack plate 54 drives the gear shaft 59 to rotate when sliding. Both ends of the gear shaft 59 extend outside the lifting insert plate 11 and are respectively fixedly installed with conical gear discs 60. Both mounting plates 49 are fixedly installed with… A shaft plate 61 is provided, avoiding the sliding path of the anti-detachment strip 48. A first transmission shaft 62 and a second transmission shaft 63 are rotatably mounted on each of the two shaft plates 61. A bevel gear 64 is fixedly mounted on each of the two first transmission shafts 62, and the two bevel gears 64 mesh with two bevel gear discs 60 respectively, so that the gear shaft 59 drives the two first transmission shafts 62 to rotate synchronously. A bevel gear 65 is fixedly mounted on each of the two second transmission shafts 63 and the two rotating shafts 50. The two corresponding bevel gears 65 on each second transmission shaft 63 and rotating shaft 50 mesh with each other, so that the second transmission shaft 63 drives the corresponding rotating shaft 50 to rotate. A sprocket 66 is fixedly mounted on each of the two first transmission shafts 62 and the second transmission shaft 63.The same chain 67 is fitted onto two corresponding sprockets 66 on the first transmission shaft 62 and the second transmission shaft 63, so that the first transmission shaft 62 drives the corresponding second transmission shaft 63 to rotate.

[0070] In this embodiment, to address the problem of the sleeve cylinder 36 easily detaching from the lifting insert plate 11 during hoisting, an innovative anti-detachment mechanism is designed on the lifting insert plate 11. This mechanism achieves its anti-detachment function through a series of ingenious mechanical structures. Specifically, inclined anti-detachment strips 48 are slidably installed on both sides of the docking port 12. When the two anti-detachment strips 48 are docked, they form a surround with the inner wall of the docking port 12 to prevent the sleeve cylinder 36 from detaching; when separated, they are retracted into the inner wall of the docking port 12 to avoid affecting the docking. The rotating shaft 50 on the assembly plate 49 drives the shifting plate gear 51 to rotate, which meshes with the tooth set 52 on the anti-detachment strips 48 to achieve synchronous sliding of the two anti-detachment strips 48. Meanwhile, by pressing the trigger plate 55, the drone's lifting control can make contact with or disengage from the bottom of the upper retaining ring 38. In conjunction with the reset spring 57, the rack plate 54 is driven to slide, which in turn drives the gear shaft 59 to rotate. Then, through the transmission of the first bevel gear 64, the first transmission shaft 62, the sprocket 66, the chain 67, the second transmission shaft 63, and the second bevel gear 65, the rotating shaft 50 is finally driven to rotate, realizing the automatic opening and closing of the anti-falling strip plate 48.

[0071] The inclined design of the anti-detachment strip 48 and its enclosure with the inner wall of the docking port 12 effectively prevent the sleeve cylinder 36 from falling off during hoisting, improving the safety and stability of the hoisting process. Simultaneously, the anti-detachment strip 48 can be retracted into the inner wall of the docking port 12, avoiding interference during docking and ensuring smooth docking. Furthermore, the use of mechanical transmission methods such as gears, sprockets 66, and chains 67, along with the use of drone lifting and its own gravity, enables the automatic opening and closing of the anti-detachment strip 48 without manual intervention, improving operational convenience and efficiency. The reset spring 57 ensures the automatic reset of the trigger plate 55 and rack plate 54 upon pressing, allowing the mechanism to be reused.

[0072] From the perspective of the entire hoisting system, the anti-detachment mechanism in this embodiment has a positive impact on the system's performance and operational efficiency. By preventing the sleeve cylinder 36 from falling off, it improves the safety and reliability of hoisting operations and reduces the risk of equipment damage and personnel injury caused by detachment. At the same time, the automatically opening and closing anti-detachment strip 48 improves the efficiency of hoisting operations and shortens the operation time.

[0073] In another embodiment of the present invention, each of the two anti-detachment strip plates 48 is provided with a limiting guide groove 68, and each of the two assembly plates 49 is fixedly installed with a limiting guide block 69. The two limiting guide blocks 69 are respectively inserted into the corresponding limiting guide grooves 68 so that the anti-detachment strip plate 48 slides along the limiting guide block 69 according to the limiting guide groove 68.

[0074] In this embodiment, limiting guide grooves 68 are added to the two anti-detachment strips 48, and limiting guide blocks 69 are fixedly installed on the corresponding assembly plates 49. Specifically, the two limiting guide blocks 69 are respectively inserted into the corresponding limiting guide grooves 68 to form a sliding fit structure. When the anti-detachment strip 48 slides, the limiting guide grooves 68 move along the axial trajectory of the limiting guide blocks 69, ensuring that the sliding direction of the anti-detachment strip 48 is always consistent with the preset path, avoiding deviation or jamming caused by external force or vibration.

[0075] In summary, compared with related technologies, this device is a lightning protection device that uses drones for rapid installation and disassembly. Drones replace manual high-altitude operations, avoiding the risk of falls and improving maintenance efficiency. The combination of drone hoisting and disassembly mechanism with modular lightning protection device solves the problem of difficult installation and maintenance of traditional lightning protection devices at high altitudes.

[0076] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus may be implemented in other ways.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A lightning protection device for power transmission lines, characterized in that, include: Lightning protection device and drone hoisting and dismantling mechanism: the lightning protection device is installed at a high point of the power transmission line and connected to the ground to conduct lightning to the ground to achieve lightning protection; the drone hoisting and dismantling mechanism is installed on the drone for dismantling and installing the lightning protection device. The lightning protection device includes a circular shell base, a center-of-gravity circular base, and a main pin. The outer side of the circular shell base is fixedly installed with mounting ears and mounting holes for installation. The center-of-gravity circular base is detachably installed on the top of the circular shell base, and the main pin is fixedly installed on the top of the center-of-gravity circular base for attracting lightning. The top of the circular shell base has a circular interface, and the bottom of the circular base has a hemispherical grounding docking block fixedly installed. The hemispherical grounding docking block can be embedded into the circular shell base through the circular interface. The bottom inner wall of the circular shell base has a grounding dock seat fixedly installed. The grounding dock seat is in close contact with the embedded hemispherical grounding docking block. The grounding dock seat is connected to a grounding down conductor. The grounding down conductor passes through the circular shell base and extends to the ground. A grounding plate is fixedly installed at one end located on the ground. A grounding nail is fixedly installed at the bottom of the grounding plate for insertion into the ground. The UAV hoisting and dismantling mechanism includes a hoisting insert plate for engaging or disengaging with the main pin, thereby hoisting the center of gravity circular seat, the main pin, and the hemispherical grounding docking block, and achieving the engagement or disengagement of the center of gravity circular seat and the hemispherical grounding docking block with the circular shell seat.

2. The power transmission line lightning protection device as described in claim 1, characterized in that, The main pin, the center of gravity circular seat, the hemispherical grounding dock block, the grounding dock seat, the grounding down conductor, the grounding plate and the grounding nail are all made of conductive materials and are used to conduct lightning into the ground.

3. The power transmission line lightning protection device as described in claim 1, characterized in that, The drone hoisting and dismantling mechanism also includes an extension plate, a storage sleeve plate, and a drone mounting plate. The hoisting insert plate has a docking port on one side for connecting with the main pin. The extension plate is fixedly installed on the other side of the hoisting insert plate away from the docking port. The storage sleeve plate is slidably fitted over the extension plate for storing the extension plate. The drone mounting plate is fixedly installed on the storage sleeve plate for connecting with the drone. The storage sleeve plate is equipped with a length-fixing bolt, the end of which abuts against the extension plate to fix the length of the extension plate on the storage sleeve plate.

4. The power transmission line lightning protection device as described in claim 1, characterized in that, Both the circular shell base and the grounding dock have insertion holes. One end of the grounding lead is inserted into the insertion hole on the grounding dock through the insertion hole on the circular shell base. A sliding opening is provided on one side of the inner wall of the insertion hole on the grounding dock. A pressure block is slidably installed in the sliding opening. A pressure bolt is threaded on one side of the inner wall of the sliding opening. One end of the pressure bolt is rotatably connected to the pressure block, and the other end is located outside the grounding dock. This allows the pressure bolt to move between the grounding dock and the sliding opening when it rotates, thereby causing the pressure block to slide within the sliding opening, thus fixing and unlocking the grounding lead.

5. The power transmission line lightning protection device as described in claim 4, characterized in that, The circular shell base has an operating port on one side corresponding to the position of the pressure bolt. The outer side of the circular shell base is equipped with a sealing plate that can be detachably installed with bolts to close the operating port.

6. The power transmission line lightning protection device as described in claim 1, characterized in that, The top of the center of gravity circular base is fixedly installed with multiple auxiliary needles arranged around the main needle. The multiple auxiliary needles are all inclined and their height is lower than that of the main needle. The top of the multiple auxiliary needles is fixedly installed with the same dynamic equalizing ring, which is located outside the main needle. A connecting sleeve is fixedly sleeved on the main needle. Horizontal pull rods are fixedly installed in the middle sections of the multiple auxiliary needles, and the multiple horizontal pull rods are fixedly connected to the connecting sleeves.

7. The power transmission line lightning protection device as described in claim 6, characterized in that, Multiple support rods are fixedly installed on the top of the circular shell base. All support rods are inclined. The top of the multiple support rods is fixedly installed with the same docking and straightening ring. The diameter of the circle formed by the bottom ends of the multiple support rods is equal to the diameter of the center of gravity circular base. The inner side of the docking and straightening ring is in contact with the outer side of the multiple auxiliary pins. The support rods and docking and straightening ring are used to correctly guide and straighten the lightning protection device when it is placed.

8. The power transmission line lightning protection device as described in claim 4, characterized in that, The pressure block has an arc-shaped groove on one side of the grounding lead, and anti-slip protrusions are fixedly installed on the inner wall of the arc-shaped groove.

9. The power transmission line lightning protection device as described in claim 1, characterized in that, The top of the grounding dock has a docking arc groove, and after the hemispherical grounding dock block docks with the grounding dock, its bottom is perfectly embedded in the docking arc groove.

10. The power transmission line lightning protection device as described in claim 7, characterized in that, The main needle and multiple auxiliary needles are all fitted with ceramic sleeves, and the ceramic sleeves of the auxiliary needles are in contact with the inner side of the docking and straightening ring.

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