A water power plant inspection unmanned aerial vehicle

Abstract

The present disclosure relates to the field of hydropower plant inspection, and particularly relates to a hydropower plant inspection unmanned aerial vehicle. The hydropower plant inspection unmanned aerial vehicle comprises a mounting bin and a first marking assembly. The mounting bin is provided with a mounting cavity and comprises a bottom plate. The bottom plate is provided with a first port. The first port is rotationally provided with a first plate having a first position and a second position. In the first position, the first plate is arranged in parallel with the bottom plate to block the first port. In the second position, the first plate is arranged at an angle with the bottom plate. The first marking assembly comprises a marking pen. The marking pen is arranged on the first plate in a first direction position. The first direction is perpendicular to the rotation axis of the first plate. The marking pen is used for smearing a mark on the surface of the equipment. The hydropower plant inspection unmanned aerial vehicle of the embodiment of the present disclosure marks and warns the abnormal points, facilitates quick positioning of the abnormal points, improves the inspection efficiency, and reduces the workload of the maintenance personnel.

Description

Technical Field

[0001] This disclosure relates to the field of hydropower plant inspection, specifically to a hydropower plant inspection drone. Background Technology

[0002] Hydropower plants have a wide variety of power generation equipment distributed throughout the plant, making manual inspections difficult and time-consuming. Related technologies have proposed using drones for assisted inspections to improve efficiency, reduce difficulty, and address regional inspection issues. However, while drone inspections can efficiently collect equipment images, relying on AI algorithms still requires manual comparison, location, and confirmation of defects from massive amounts of data. This results in delays, where defects are "visible but not accurately identified or clearly marked," necessitating secondary on-site visits by maintenance personnel, increasing the misjudgment rate and workload. Summary of the Invention

[0003] This disclosure aims to at least partially address one of the technical problems in the related art.

[0004] Therefore, embodiments of this disclosure propose a hydropower plant inspection drone. This hydropower plant inspection drone marks and warns of abnormal points, which facilitates rapid location of abnormal points, improves inspection efficiency, and reduces the workload of maintenance personnel.

[0005] The hydropower plant inspection drone of the present disclosure includes:

[0006] The installation compartment has an installation cavity and includes a bottom plate. The bottom plate has a first opening. The first opening is rotatably connected to a first plate having a first position and a second position. In the first position, the first plate is arranged parallel to the bottom plate to block the first opening. In the second position, the first plate is arranged at an angle to the bottom plate. A first marking component includes a marking pen, which is positionally adjustable on the first plate along a first direction perpendicular to the rotation axis of the first plate. The marking pen is used to apply markings to the surface of the device.

[0007] The hydropower plant inspection drone of this disclosure can land at the location of the abnormal point when an abnormal point is found during the inspection process. The position of the first plate and the marking pen can be adjusted by the first marking component so that the marking pen can mark the location of the abnormal point. This improves the marking efficiency of abnormal points and the inspection effect, and reduces the marking error and the workload of maintenance personnel to verify the location.

[0008] In some possible implementations, the first marking assembly includes a first shaft, a first rod, and a first connector. The first shaft is disposed in the mounting cavity, the first rod is rotatably disposed on the first shaft, the first connector is rotatably disposed at the other end of the first rod and fixedly connected to the marking pen, and the first connector is slidably assembled to the first plate along the first direction and engages with the first plate in a stop engagement in a second direction, the second direction being perpendicular to the first direction and the rotation axis of the first plate.

[0009] In some possible implementations, the first marking assembly further includes a first direct drive unit that can be extended and retracted, the first direct drive unit being rotatably disposed in the mounting chamber and having its other end rotatably connected to the first rod, the first direct drive unit being used to drive the first rod to rotate.

[0010] In some possible implementations, there are two first rods, each with a first connector at its end, a second shaft between the two first rods, the end of the first direct drive unit being rotatably connected to the second shaft, and the marking pen being fixedly connected between the two first connectors.

[0011] In some possible implementations, the first rod is an arc-shaped rod.

[0012] In some possible implementations, the first connector is configured as a sliding seat, the first plate is provided with a slide rail extending along a first direction, the slide rail has a T-shaped cross section, and the sliding seat is slidably assembled to the slide rail.

[0013] In some possible implementations, a second marking assembly is also included, comprising a second plate, a powder cartridge, and a sponge compartment. The base plate has a second opening, and the second plate is rotatably disposed at the second opening and has a third position and a fourth position. In the third position, the second plate is parallel to the base plate to block the second opening. In the fourth position, the second plate is disposed at an angle to the base plate. The powder cartridge is adjustable along a third direction and is used to store fluorescent material. The sponge compartment is disposed at the end of the powder cartridge and is used to contact the device surface to apply fluorescent material.

[0014] In some possible implementations, the second marking assembly includes a second rod, a second connector, a second direct drive unit, and a transmission rod. The second rod is rotatably mounted on the base plate. The second connector is rotatably connected to the second rod and slidably mounted on the second plate along the third direction. The powder box is fixedly connected to the second connector. The second direct drive unit is rotatably mounted on the mounting chamber and can extend and retract. The transmission rod is an arc-shaped rod with its two ends rotatably connected to the second direct drive unit and the second plate, respectively. The second direct drive unit is used to drive the transmission rod to rotate the second plate.

[0015] In some possible implementations, the second plate is provided with a groove extending in a third direction, and the second connector is constructed as a connecting block with an "I" shaped cross section. The connecting block is slidably fitted in the groove and stops the second plate in a fourth direction.

[0016] In some possible implementations, an inspection assembly is included, comprising a transparent inspection cover and a cleaning rack. The transparent inspection cover passes through the base plate and is used to house an inspection camera assembly. The cleaning rack is mounted on the base plate and abuts against the outer wall of the transparent inspection cover for cleaning the transparent inspection cover. One of the transparent inspection cover and the cleaning rack is rotatably mounted to the base plate so that the cleaning rack can rotate relative to the transparent inspection cover.

[0017] In some possible implementations, the inspection assembly further includes a drive motor, a first bevel gear, and a second bevel gear. The transparent inspection cover is rotatably mounted on the base plate, the cleaning rack is fixedly mounted on the base plate, the drive motor is fixedly mounted in the mounting cavity, the first bevel gear is fixedly mounted at the output end of the drive motor, and the second bevel gear is fixedly mounted on the transparent inspection cover and meshes with the first bevel gear. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a hydropower plant inspection drone according to an embodiment of this disclosure.

[0019] Figure 2 This is a first-view connection diagram of the mounting compartment in a hydropower plant inspection drone according to an embodiment of the present disclosure.

[0020] Figure 3 This is a second-view connection diagram of the mounting compartment in a hydropower plant inspection drone according to an embodiment of the present disclosure.

[0021] Figure 4 This is a schematic diagram of the structure of the first marking component in a hydropower plant inspection drone according to an embodiment of this disclosure.

[0022] Figure 5 This is a schematic diagram of the structure of the second marking component in a hydropower plant inspection drone according to an embodiment of this disclosure.

[0023] Figure 6 This is a schematic diagram of the connection of the powder box in a hydropower plant inspection drone according to an embodiment of this disclosure.

[0024] Figure 7 This is an exploded view of the connection of the inspection components in a hydropower plant inspection drone according to an embodiment of this disclosure.

[0025] Figure 8This is an exploded view of the connection of the cleaning frame in a hydropower plant inspection drone according to an embodiment of this disclosure.

[0026] Figure label: Installation compartment 1; Installation cavity 11; Base plate 12; First plate 13; Slide rail 131; First marking assembly 2; marking pen 21; first shaft 22; first rod 23; first connector 24; first direct drive unit 25; second shaft 26; Second marking assembly 3; second plate 31; chute 311; powder box 32; sponge compartment 33; second rod 34; second connector 35; second direct drive unit 36; transmission rod 37; Inspection component 4; transparent inspection cover 41; cleaning rack 42; drive motor 43; first bevel gear 44; second bevel gear 45; wiping cotton strip 46. Detailed Implementation

[0027] Embodiments of this disclosure are described in detail below, with examples of these embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting it.

[0028] The following is a reference appendix. Figures 1 to 8 This disclosure describes a hydropower plant inspection drone as an embodiment of the present disclosure.

[0029] like Figures 1 to 4 As shown, the hydropower plant inspection drone of this disclosure includes an installation chamber 1 and a first marking component 2. The installation chamber 1 is provided with an installation cavity 11 and includes a base plate 12. The base plate 12 is provided with a first opening. The first opening is rotatably provided with a first plate 13 having a first position and a second position. The extension direction of the first plate 13, i.e., the length direction, is defined as the first direction. In the first position, the first plate 13 is arranged parallel to the base plate 12 to block the first opening. In the second position, the first plate 13 is arranged at an angle to the base plate 12. The first marking component 2 includes a marking pen 21. The marking pen 21 is positioned adjustablely on the first plate 13 along the first direction. The first direction is perpendicular to the rotation axis of the first plate 13. The marking pen 21 is used to apply markings to the surface of the equipment.

[0030] During use, when the hydropower plant inspection drone of the present disclosure detects an anomaly, it can accurately land at that location and drive the first plate 13 to rotate relative to the base plate 12, so that the first plate 13 rotates from the first position to the second position. The marking pen 21 rotates with the first plate 13 and adjusts its position relative to the first plate 13, so that the marking pen 21 extends out of the first plate 13. The drone's position can be moved or the marking pen 21 can be driven to extend further. The marking pen 21 can make marks on the surface of the equipment to facilitate personnel to quickly find anomalies. After the marking pen 21 has finished making marks, the marking pen 21 and the first plate 13 can be reset and adjusted to prepare for the next marking. The operation is convenient, safe and reliable.

[0031] The hydropower plant inspection drone of this disclosure can land at the location of the abnormal point when an abnormal point is found during the inspection. The first marking component 2 adjusts the position of the first plate 13 and the marking pen 21 so that the marking pen 21 can mark the abnormal point. This improves the marking efficiency and inspection effect of the abnormal point, reduces marking errors and the workload of maintenance personnel to verify the location. At the same time, by switching the first plate 13 to the first position and the second position, it is convenient to protect the first plate 13 and the marking pen 21, and improve the reliability and safety of the application.

[0032] In some possible implementations, such as Figure 3 and Figure 4 As shown, the first marking assembly 2 includes a first shaft 22, a first rod 23, and a first connector 24. The first shaft 22 is disposed in the mounting cavity 11, the first rod 23 is rotatably disposed on the first shaft 22, and the first connector 24 is rotatably disposed on the other end of the first rod 23 and fixedly connected to the marking pen 21. The thickness direction of the first plate 13 is defined as the second direction. The first connector 24 is slidably assembled on the first plate 13 along the first direction and is in a stop-fitting relationship with the first plate 13 in the second direction. The second direction is perpendicular to the first direction and the rotation axis of the first plate 13.

[0033] In this embodiment, the first shaft 22 facilitates the rotational adjustment of the first rod 23. The first connecting member 24 and the first plate 13 are engaged in a blocking cooperation in the second direction. When adjusting the position of the first plate 13 and the marker pen 21, the first rod 23 rotates around the first shaft 22 relative to the mounting chamber 1. The first rod 23 drives the first connecting member 24 to slide relative to the first plate 13, thereby realizing the rotational adjustment of the first plate 13 at the first position and the second position. At the same time, when the first connecting member 24 slides relative to the first plate 13, it drives the marker pen 21 to move relative to the first plate 13, thereby realizing the position adjustment of the marker pen 21. That is, by setting the first rod 23 and the first connecting member 24, the linkage adjustment of the first plate 13 and the marker pen 21 is realized, which makes the operation more convenient and reliable. Compared with the structure of setting the first plate 13 and the marker pen 21 separately, it is more concise and better meets the operational requirements of UAVs with light load and long endurance.

[0034] In some possible implementations, such as Figure 4 As shown, the first marking assembly 2 also includes a first direct drive unit 25 that can be extended and retracted. The first direct drive unit 25 is rotatably mounted in the mounting chamber 1 and its other end is rotatably connected to the first rod 23. The first direct drive unit 25 is used to drive the first rod 23 to rotate. By setting the first direct drive unit 25, it is convenient to adjust the rotation of the first rod 23. The connection is reliable and the transmission is stable.

[0035] In some possible implementations, the first direct drive unit 25 is an electric actuator, a hydraulic actuator, or a pneumatic actuator.

[0036] In some possible implementations, such as Figure 4 As shown, there are two first rods 23, and each of the two first rods 23 has a first connector 24 at its end. A second shaft 26 is provided between the two first rods 23. The end of the first direct drive unit 25 is rotatably connected to the second shaft 26. The marker pen 21 is fixedly connected between the two first connectors 24.

[0037] In this embodiment, by setting two first rods 23, the connection reliability between the first rod 23 and the first plate 13 is improved, and the stability of the first rod 23 when driving the first plate 13 to rotate is also improved. By setting the marker pen 21 between the two first connectors 24, the synchronization rate of movement between the two first connectors 24 can be improved, and the installation reliability and adjustment stability of the marker pen 21 can be improved, making it easier for the marker pen 21 to make marks.

[0038] In some possible implementations, such as Figure 4 As shown, multiple marker pens 21 are spaced apart, which facilitates marking of the equipment and increases the recognizability of the markings, making it easier for maintenance personnel to quickly identify them.

[0039] In some possible implementations, such as Figure 4 As shown, the first rod 23 is an arc-shaped rod. By setting the first rod 23 as an arc-shaped rod, it is easier to drive and adjust the position of the first plate 13, while reducing the interference between the first plate 13 and other components during rotation, and improving the reliability and stability of the first rod 23 during rotation.

[0040] In some possible implementations, such as Figure 4 As shown, the first connector 24 is constructed as a sliding seat, and the first plate 13 is provided with a slide rail 131 extending along the first direction. The slide rail 131 has a T-shaped cross section. The sliding seat is slidably assembled on the slide rail 131. By setting the sliding seat and the slide rail 131, it is easy to process and improves the connection reliability between the first connector 24 and the first plate 13, and is easy to adjust.

[0041] In some possible implementations, such as Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, it also includes a second marking component 3, which includes a second plate 31, a powder box 32, and a sponge container 33. The base plate 12 is provided with a second opening. The second plate 31 is rotatably disposed at the second opening and has a third position and a fourth position. In the third position, the second plate 31 is parallel to the base plate 12 to block the second opening. In the fourth position, the second plate 31 is set at an angle to the base plate 12. The powder box 32 is adjustablely disposed on the second plate 31 along the third direction. The powder box 32 is used to store fluorescent material. The sponge container 33 is disposed at the end of the powder box 32 and is used to contact the device surface to apply fluorescent material.

[0042] In this embodiment, by setting a second marking component 3, the second plate 31 is rotated from the third position to the fourth position during marking, and the marking unit is moved on the second plate 31 to apply the powder to the equipment. This makes the operation convenient. By setting a powder box 32 and a sponge compartment 33, the sponge compartment 33 can be deformed to fit uneven equipment surfaces when marking the equipment surface, improving marking efficiency and making it easier for maintenance personnel to quickly identify the location to be repaired, thus improving inspection efficiency.

[0043] In some possible implementations, such as Figure 5 As shown, the second marking assembly 3 includes a second rod 34, a second connector 35, a second direct drive unit 36, and a transmission rod 37. The second rod 34 is rotatably mounted on the base plate 12. The second connector 35 is rotatably connected to the second rod 34 and slidably mounted on the second plate 31 along a third direction. The powder box 32 is fixedly connected to the second connector 35. The second direct drive unit 36 ​​is rotatably mounted on the mounting chamber 1 and can be extended and retracted. The transmission rod 37 is an arc-shaped rod with both ends rotatably connected to the second direct drive unit 36 ​​and the second plate 31, respectively. The second direct drive unit 36 ​​is used to drive the transmission rod 37 to drive the second plate 31 to rotate.

[0044] In this embodiment, by setting a second rod 34, a second connector 35, a second direct drive unit 36, and a transmission rod 37, the positions of the second plate 31 and the powder box 32 can be easily adjusted. When the second direct drive unit 36 ​​extends, it drives the transmission rod 37 to rotate, which in turn drives the second plate 31 to rotate away from the base plate 12 until the second plate 31 rotates to the fourth position. At the same time, the second connector 35 moves away from the base plate 12 under the action of the second rod 34, thereby driving the powder box 32 to move and extend. When the second direct drive unit retracts, it drives the transmission rod 37 to rotate, which in turn drives the second plate 31 to rotate away from the base plate 12 until the second plate 31 rotates to the fourth position. The second plate 31 rotates towards the base plate 12 until it reaches the third position. Simultaneously, the second connecting piece 35 moves towards the base plate 12 under the action of the second rod 34, thereby driving the powder box 32 to move and retract. In other words, by setting the second rod 34, the second connecting piece 35, the second direct drive unit 36, and the transmission rod 37, the linkage adjustment of the second plate 31 and the powder box 32 is realized, making the operation more convenient and reliable. By setting the transmission piece as an arc-shaped plate, it is easy to transmit the driving force of the second direct drive unit 36, avoiding interference between the transmission piece and other components during the adjustment process, ensuring reliable transmission and strong stability.

[0045] In some possible implementations, the first direct drive unit 25 is an electric actuator, a hydraulic actuator, or a pneumatic actuator.

[0046] In some possible implementations, such as Figure 5 and Figure 6 As shown, the second plate 31 is provided with a groove 311 extending in the third direction, and the second connector 35 is constructed as a connecting block with an "I" shaped cross section. The connecting block is slidably fitted in the groove 311 and is in a stop-fitting fit with the second plate 31 in the fourth direction.

[0047] In this embodiment, by setting a groove 311 on the second plate 31, the installation of the second connector 35 is facilitated. At the same time, the second connector 35 is set as an "I"-shaped connecting block, which improves the connection reliability between the second connector 35 and the second plate 31 and reduces the space occupied by the second connector 35 when it is set, thus simplifying the structure.

[0048] In some possible implementations, such as Figure 7 and Figure 8 As shown, the system includes an inspection component 4, which includes a transparent inspection cover 41 and a cleaning rack 42. The transparent inspection cover 41 is installed through the base plate 12 and is used to house the inspection camera component. The cleaning rack 42 is installed on the base plate 12 and abuts against the outer wall of the transparent inspection cover for cleaning the transparent inspection cover 41. One of the transparent inspection cover 41 and the cleaning rack 42 is rotatably assembled with the base plate 12 so that the cleaning rack 42 can rotate relative to the transparent inspection cover 41.

[0049] One of the transparent inspection cover 41 and the cleaning rack 42 is rotatably assembled with the base plate 12 so that the cleaning rack 42 can rotate relative to the transparent inspection cover 41. It can be understood that the transparent inspection cover 41 is rotatably assembled with the base plate 12, and the cleaning rack 42 is fixedly connected to the base plate 12; or, the transparent inspection cover 41 is fixedly connected to the base plate 12, and the cleaning rack 42 is rotatably assembled with the base plate 12.

[0050] In this embodiment, by setting a transparent inspection cover 41 and a cleaning rack 42, the surface of the transparent inspection cover 41 can be cleaned by the relative rotation of the transparent inspection cover 41 and the cleaning rack 42. This avoids the situation where the inspection camera component set inside the transparent inspection cover 41, such as a traditional static lens, is affected by water vapor condensation or dust and oil stains, resulting in blurred images of concept stocks. This ensures that the thermal imaging sensor always obtains more accurate data images, guarantees the accuracy of thermal imaging in capturing abnormal locations, and improves inspection efficiency.

[0051] In some possible implementations, such as Figure 7 As shown, the inspection assembly 4 also includes a drive motor 43, a first bevel gear 44 and a second bevel gear 45. The transparent inspection cover 41 is rotatably mounted on the base plate 12 via a connecting bearing. The cleaning rack 42 is fixedly mounted on the base plate 12. The drive motor 43 is fixedly mounted in the mounting cavity 11. The first bevel gear 44 is fixedly mounted at the output end of the drive motor 43. The second bevel gear 45 is fixedly mounted on the transparent inspection cover 41 and meshes with the first bevel gear 44.

[0052] In this embodiment, a drive motor 43 is provided, and the drive motor 43 and the transparent inspection cover 41 are connected by gear transmission, which facilitates the rotation and adjustment of the transparent inspection cover 41, thereby improving the cleaning efficiency of the transparent inspection cover 41 and improving the inspection efficiency.

[0053] In some possible implementations, such as Figure 8 As shown, a wiping strip 46 is provided on the side of the cleaning rack 42 near the transparent inspection cover 41. The transparent inspection cover 41 is cleaned by wiping the strip and the surface of the transparent inspection cover 41 is protected to avoid damage to the surface of the transparent inspection cover 41 during cleaning, which would affect the inspection efficiency.

[0054] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

[0056] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0057] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A hydropower plant inspection drone, characterized in that, include: The installation compartment has an installation cavity and includes a bottom plate. The bottom plate has a first opening. The first opening is rotatably connected to a first plate having a first position and a second position. In the first position, the first plate is arranged parallel to the bottom plate to block the first opening. In the second position, the first plate is arranged at an angle to the bottom plate. A first marking component includes a marking pen, which is positionally adjustable on the first plate along a first direction perpendicular to the rotation axis of the first plate. The marking pen is used to apply markings to the surface of the device.

2. The hydropower plant inspection drone according to claim 1, characterized in that, The first marking assembly includes a first shaft, a first rod, and a first connector. The first shaft is disposed in the mounting cavity. The first rod is rotatably disposed on the first shaft. The first connector is rotatably disposed at the other end of the first rod and is fixedly connected to the marking pen. The first connector is slidably assembled on the first plate along the first direction and is in a stop-fitting engagement with the first plate in a second direction. The second direction is perpendicular to the first direction and the rotation axis of the first plate.

3. The hydropower plant inspection drone according to claim 2, characterized in that, The first marking assembly further includes a first direct drive unit capable of telescopic operation. The first direct drive unit is rotatably disposed in the mounting chamber and its other end is rotatably connected to the first rod. The first direct drive unit is used to drive the first rod to rotate.

4. The hydropower plant inspection drone according to claim 3, characterized in that, The first rod has two parts, each with a first connecting member at its end. A second shaft is provided between the two first rods. The end of the first direct drive unit is rotatably connected to the second shaft. The marking pen is fixedly connected between the two first connecting members; and / or, The first rod is an arc-shaped rod.

5. The hydropower plant inspection drone according to claim 2, characterized in that, The first connector is constructed as a sliding seat, and the first plate is provided with a slide rail extending along a first direction. The slide rail has a T-shaped cross section, and the sliding seat is slidably assembled to the slide rail.

6. The hydropower plant inspection drone according to any one of claims 1-5, characterized in that, It also includes a second marking assembly, which includes a second plate, a powder cartridge, and a sponge compartment. The base plate has a second opening, and the second plate is rotatably disposed at the second opening and has a third position and a fourth position. In the third position, the second plate is parallel to the base plate to block the second opening. In the fourth position, the second plate is set at an angle to the base plate. The powder cartridge is adjustablely disposed on the second plate along a third direction. The powder cartridge is used to store fluorescent material. The sponge compartment is disposed at the end of the powder cartridge and is used to contact the device surface to apply fluorescent material.

7. The hydropower plant inspection drone according to claim 6, characterized in that, The second marking assembly includes a second rod, a second connector, a second direct drive unit, and a transmission rod. The second rod is rotatably mounted on the base plate. The second connector is rotatably connected to the second rod and slidably mounted on the second plate along the third direction. The powder box is fixedly connected to the second connector. The second direct drive unit is rotatably mounted on the mounting chamber and can extend and retract. The transmission rod is an arc-shaped rod with its two ends rotatably connected to the second direct drive unit and the second plate, respectively. The second direct drive unit is used to drive the transmission rod to rotate the second plate.

8. The hydropower plant inspection drone according to claim 7, characterized in that, The second plate is provided with a sliding groove extending in a third direction. The second connector is constructed as a connecting block with an "I" shaped cross section. The connecting block is slidably fitted in the sliding groove and is in a stop-fitting cooperation with the second plate in a fourth direction.

9. The hydropower plant inspection drone according to any one of claims 1-5, characterized in that, The system includes an inspection assembly comprising a transparent inspection cover and a cleaning rack. The transparent inspection cover is inserted through the base plate and is used to house the inspection camera assembly. The cleaning rack is mounted on the base plate and abuts against the outer wall of the transparent inspection cover for cleaning the transparent inspection cover. One of the transparent inspection cover and the cleaning rack is rotatably assembled with the base plate so that the cleaning rack can rotate relative to the transparent inspection cover.

10. The hydropower plant inspection drone according to claim 9, characterized in that, The inspection assembly also includes a drive motor, a first bevel gear, and a second bevel gear. The transparent inspection cover is rotatably mounted on the base plate, the cleaning rack is fixedly mounted on the base plate, the drive motor is fixedly mounted in the mounting cavity, the first bevel gear is fixedly mounted at the output end of the drive motor, and the second bevel gear is fixedly mounted on the transparent inspection cover and meshes with the first bevel gear.

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