High frequency periodic inspection system and method for large-scale high-rotation-speed hydroelectric generator rotor

Abstract

The present application relates to the technical field of hydroelectric generators, and particularly relates to a high frequency periodic inspection system and method for a large-scale high-rotation-speed hydroelectric generator rotor. The periodic inspection system comprises a shaft system driving tool mounted in a main shaft of a hydroelectric generator located in a waterwheel chamber, a braking system, a high-pressure oil jacking system, a wind shield, a wind shield mounting / removing driving device, and a control system. The periodic inspection method comprises the following steps: shutting down a generator and enabling electrical isolation protection; mounting a shaft system driving device; removing a wind shield to create sufficient operation and inspection space; exiting a braking system and starting a high-pressure oil jacking system; using the shaft system driving device for rotation, and inspecting the safety and shaft system data of a rotating part; exiting the high-pressure oil jacking system, resetting the wind shield, and starting the braking system; and removing the shaft system driving device. The present application provides a high frequency periodic inspection system and method for a large-scale high-rotation-speed hydroelectric generator rotor, in which a wind shield does not need to be manually removed and a unit shaft system can be conveniently driven to rotate.

Description

A high-frequency inspection system and method for large-scale high-speed hydro-generator rotors Technical Field

[0001] The present invention belongs to the technical field of hydro-generators, and in particular relates to a high-frequency regular inspection system and method for a rotor of a large-scale high-speed hydro-generator. Background Art

[0002] Currently, large-scale high-speed hydro-turbine generators, represented by large-scale high-speed energy storage motors, are the most important "regulators" for developing new energy and achieving "carbon peak". With the progress of China's new energy, they have achieved unprecedented development.

[0003] In recent years, the frequency of starts and stops of many large, high-speed hydroelectric generators has far exceeded that of conventional hydropower in the past. The bidirectional rotation, high speeds, high stresses, and fatigue caused by frequent starts and stops have necessitated widespread attention to the safety of the rotors—particularly the rotors, the most vulnerable components of large, high-speed hydroelectric generators. Consequently, the inspection cycle for rotors of large, high-speed hydroelectric generators has shortened from annual and semi-annual inspections to monthly inspections. Inspection targets are also becoming increasingly demanding, down to the level of precision required for every bolt along the entire circumference.

[0004] However, frequent inspections of large, high-speed hydro-turbine generator rotors currently face numerous challenges. In large, high-speed hydro-turbine generators, rotor components are obstructed by complex end shields, supports, and other components, and many high-speed units are confined to very small spaces. Currently, the inspection process begins by fixing the unit in a fixed position, removing some obstructing components such as shields, and then activating the high-pressure oil jacking process. At this point, because the collector rings, sealing covers, and other components at the top of the unit have already been installed, the upper shaft rotation tools used during initial installation cannot be used. Therefore, manual installation of pulleys, shackles, and steel ropes at the upper and lower ends of the rotor to slowly rotate the motor is commonly used to verify the integrity of the rotor components, measure concentricity with the stator, and check and adjust the rotor axis.

[0005] The problems with the existing approach are:

[0006] First, for safety reasons, the windshields at the rotor ends are constructed from multiple petals, ensuring excellent circumferential integrity. Removing and reinstalling a portion of the windshield, along with its connecting and locking components, takes half a day to a full day. This was not a problem during the annual inspections of the past, but with the current requirement for frequent monthly inspections, and potentially biweekly inspections in the future, this has become a significant inconvenience.

[0007] Furthermore, the current method of rotating large, high-speed hydro-turbine generators requires the installation of pulleys, shackles, and steel ropes, and the collaboration of four to six people to drag the rotor bracket and pre-secure nearby magnetic poles and other components. This requires a large number of people and is time-consuming and labor-intensive. In such a complex rotor end space, if tools such as shackles, bolts, and steel ropes are forgotten inside the unit during installation, risks can also arise.

[0008] Furthermore, the current rotor rotation drive parts are located at the upper and lower ends of the rotor bracket, where the space is often narrow, making it inconvenient for operators to enter and exit, install, or apply force. The spatial location is shown in Figure 7.

[0009] These commonly used methods have brought considerable inconvenience and trouble to the high-frequency regular inspections in the new normal of power plants, and may even affect the maintenance cycle. Therefore, new and convenient methods for high-frequency regular inspections of large, high-speed hydro-generator rotors are gaining increasing attention and demand.

[0010] Summary of the Invention

[0011] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a high-frequency regular inspection system and method for large-scale high-speed hydro-generator rotors that does not require the removal of the windshield and conveniently drives the unit shaft system to rotate.

[0012] The technical solution adopted in the present invention is:

[0013] A high-frequency regular inspection system for the rotor of a large, high-speed hydro-generator comprises a shaft drive device connected to the main shaft of the hydro-generator set located in the waterwheel chamber, a windshield insertion and retraction drive mechanism mounted on the frame of the hydro-generator set, a braking system acting on rotating parts including the main shaft, and a high-pressure oil lifting system; the output end of the windshield insertion and retraction drive mechanism is connected to the windshield located at the end of the rotor.

[0014] The windshield of the present invention is installed on the throwing and retracting driving mechanism, and the throwing and retracting driving mechanism is installed on the frame of the hydro-generator set. When the rotor needs to be inspected, it is lifted by the throwing and retracting driving mechanism to expose the rotor end. After there is no windshield blocking the inspection line of sight, the thrust device is used to push the locking mechanism in the annular corridor of the waterwheel room to drive the unit shaft system to rotate at a uniform and slow speed, and the rotation speed and start and stop are controlled as needed, so as to facilitate the inspection of whether the various components of the rotor are intact, measure the concentricity between the rotor and the stator, check and adjust the rotor axis, etc.

[0015] The present invention drives the windshield to be extended and retracted through an extension and retraction drive mechanism, so that there is no need to remove the end windshield, support structure and other blocking components before inspecting the rotor, which simplifies the operation and avoids the risk of objects falling into rotating components during the disassembly and assembly of parts. By installing a locking mechanism and a thrust device on the part of the main shaft located in the waterwheel chamber, the thrust device is pushed in the annular corridor of the waterwheel chamber, and the operating space is large, avoiding the trouble of using pulleys, shackles and steel ropes to drag the rotor bracket at the upper and lower ends of the rotor. The shaft system drive device proposed by the present invention does not require the disassembly of existing components of the generator set and will not cause damage to the generator. It has the characteristics of simple structure, light weight and easy disassembly and assembly, and can be operated by two people, which greatly reduces the investment in human resources.

[0016] As a preferred embodiment of the present invention, the device further includes a control system and a windshield position monitoring device. The windshield deployment and retraction drive mechanism, braking system, high-pressure oil lifting system, and windshield position monitoring device are all signal-connected to the control system. The windshield position monitoring device detects the distance between the windshield and the rotating components after the windshield is deployed, thereby verifying the proper deployment of the windshield and ensuring a safe distance between the moving and stationary components. The windshield position monitoring device can also monitor the circumferential synchronization of the windshield during deployment and retraction.

[0017] As a preferred embodiment of the present invention, the shaft drive device includes a clamp that is sleeved onto the portion of the hydro-generator main shaft located in the waterwheel chamber. A push rod is rotatably connected to the clamp, to which an adjustment bolt is attached. A tensioning strap is connected between the other end of the adjustment bolt and the clamp. A dowel bolt initially secures the clamp to the main shaft, securing the clamp and creating an initial clamping force between the clamp and the shaft. Once the push rod is in place and a distal thrust is applied, the clamping force between the clamp and the main shaft is further increased, providing sufficient friction for the generator shaft to rotate.

[0018] As a preferred embodiment of the present invention, the windshield is provided with an observation window which is convenient for removal. When rotating for inspection, the windshield does not need to be withdrawn, and only the observation window needs to be opened for inspection.

[0019] As a preferred solution of the present invention, the windshield position monitoring device is any one or more of a distance sensor, an image recognition device, a travel switch, and a displacement sensor.

[0020] As a preferred solution of the present invention, the windshield throwing and retracting driving mechanism is any one of a pneumatic machine, a hydraulic machine, a screw transmission machine, a rack transmission machine, and a traction machine.

[0021] A high-frequency inspection method for a large-scale high-speed hydro-generator rotor comprises the following steps:

[0022] S1: The generator is stopped, the braking system is in the engaged state, and the electrical isolation protection is activated;

[0023] S2: Install the shaft drive device on the part of the main shaft of the turbine generator set located in the waterwheel room;

[0024] S3: The windshield insertion and retraction driving mechanism drives the windshield to retract;

[0025] S4: The braking system exits and the high-pressure oil jacking system is activated;

[0026] S5: Use the shaft drive device to drive the generator rotating parts to rotate, and turn the gear to check the safety of the rotating parts and shaft data;

[0027] S6: Exit the high-pressure oil lifting system, the windshield insertion and retraction drive mechanism drives the windshield to be inserted, and the braking system is inserted;

[0028] S7: Remove the shaft drive unit.

[0029] As a preferred embodiment of the present invention, in step S3 and step S6, the windshield has the following two ways of being put into operation or withdrawn:

[0030] Method 1: A whole ring of windshields (6) arranged along the circumference are integrally extended and retracted, the windshields (6) are connected to the windshield extension and retraction driving mechanism (5) at least at three locations on the circumference, and a windshield position monitoring device monitors the synchronization of the whole ring of windshields (6) during the extension and retraction process of the windshields (6) in real time;

[0031] Method 2: The windshield (6) is single-petaled and connected to the windshield driving mechanism (5) at least at three locations.

[0032] As a preferred solution of the present invention, in step S3 and step S6, the distance between the windshield (6) and the rotating component after the windshield (6) is put in is detected by the windshield position monitoring device, and whether the windshield is in the set position after the putting-in and retracting operations is detected.

[0033] As a preferred solution of the present invention, in step S4, the establishment status of the thrust shoe lubrication system is determined by a displacement sensor fixed to the end of the rotating component and a high-pressure oil jacking system.

[0034] The beneficial effects of the present invention are:

[0035] The present invention drives the windshield to retract through the insertion and withdrawal drive mechanism, so that there is no need to remove the end windshield, support structure and other blocking components before inspecting the rotor, which simplifies the operation. By installing a locking mechanism and a thrust device on the part of the main shaft located in the waterwheel chamber, the thrust device is pushed in the annular corridor of the waterwheel chamber, and the operating space is large, avoiding the trouble of using pulleys, shackles and steel ropes to drag the rotor bracket at the upper and lower ends of the rotor. The shaft system drive device proposed by the present invention does not require the removal of existing components of the generator set and will not cause damage to the generator. It has the characteristics of simple structure, light weight, and easy disassembly and assembly. It can be operated by two people, which greatly reduces the investment in human resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a schematic structural diagram of the present invention;

[0037] FIG2 is a partial enlarged view of point A in FIG1 ;

[0038] FIG3 is a schematic structural diagram of a shaft drive device;

[0039] FIG4 is a top view of the shaft drive device;

[0040] Figure 5 is a diagram showing the working principle of the shaft drive device;

[0041] FIG6 is a schematic structural diagram of a windshield;

[0042] FIG7 is a control flow chart of the braking system control process;

[0043] FIG8 is a control flow chart of the high-pressure oil jacking system;

[0044] FIG9 is a flow chart of windshield exit control;

[0045] FIG10 is a flow chart of windshield input control.

[0046] In the figure: 1-main shaft; 2-frame; 3-rotor; 4-axis drive device; 5-wind deflector insertion and retraction drive mechanism; 6-wind deflector; 41-push rod; 42-adjusting bolt; 43-tensioning belt; 44-rotating shaft; 45-joining bolt; 46-clamping hoop; 47-protective pad; 61-observation window. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.

[0049] As shown in Figures 1 and 2, the high-frequency regular inspection system for the rotor of a large high-speed hydro-generator in this embodiment includes a shaft drive device 4 connected to the main shaft 1 of the hydro-generator set located in the waterwheel chamber, a windshield insertion and retraction drive mechanism 5 installed on the frame 2 of the hydro-generator set, a braking system and a high-pressure oil lifting system acting on the rotating parts including the main shaft 1, and the output end of the windshield insertion and retraction drive mechanism 5 is connected to the windshield 6 located at the end of the rotor 3.

[0050] The windshield 6 of the present invention is installed on the investment and withdrawal drive mechanism, and the investment and withdrawal drive mechanism is installed on the frame 2 of the hydro-generator set. When the rotor 3 needs to be inspected, it is lifted by the investment and withdrawal drive mechanism to expose the end of the rotor 3. After the windshield 6 is no longer blocking the inspection line of sight, the thrust device is used to push the locking mechanism in the annular corridor of the waterwheel room to drive the unit shaft system to rotate at a uniform and slow speed, and the rotation speed and start and stop are controlled as needed, so as to facilitate the inspection of whether the various components of the rotor 3 are intact, measure the concentricity between the rotor 3 and the stator, and check and adjust the axis of the rotor 3.

[0051] The portable shaft drive (shaft drive 4) eliminates the need to locate the shaft drive within the cramped interior of the generator, but instead locates it in the spacious waterwheel chamber of the main shaft 1. Because the shaft surface in this location is smooth and delicate, no damage is tolerated. Therefore, the new portable shaft drive eliminates the commonly used drive structures, such as pulleys, lifting lugs, and welding.

[0052] The present invention drives the windshield 6 to be extended and retracted by the windshield extension and retraction drive mechanism 5, so that there is no need to remove the end windshield 6, support structure and other blocking components before checking the rotor 3, which simplifies the operation and avoids the risk of objects falling into rotating components during the disassembly and assembly of parts. By installing a locking mechanism and a thrust device on the part of the main shaft 1 located in the waterwheel chamber, the thrust device is pushed in the annular corridor of the waterwheel chamber, and the operating space is large, avoiding the trouble of using pulleys, shackles and steel ropes to drag the rotor 3 bracket at the upper and lower ends of the rotor 3. The shaft system drive device 4 proposed by the present invention does not require the disassembly of existing components of the generator set and will not cause damage to the generator. It has the characteristics of simple structure, light weight and easy disassembly and assembly, and can be operated by two people, which greatly reduces the investment in human resources.

[0053] The present invention also includes a control system and a windshield position monitoring device. The windshield position monitoring device is fixed to the frame 2. The windshield deployment and retraction drive mechanism 5, the braking system, the high-pressure oil lifting system, and the windshield position monitoring device are all connected to the control system through signal connections. The windshield position monitoring device detects the distance between the windshield 6 and the rotating components after the windshield 6 is deployed, thereby determining whether the windshield 6 is in place and ensuring a safe distance between the moving and static components. The windshield position monitoring device can also monitor the circumferential synchronization of the windshield 6 during the deployment and retraction process.

[0054] When the windshield 6 extension and retraction drive receives a signal from the control system, it is extended and retracted via the windshield 6 extension and retraction drive actuator. During the extension and retraction process, the windshield 6 must remain horizontal. Therefore, strict requirements are placed on the speed and synchronization of the extension and retraction drive during the overall extension and retraction of the windshield 6. Each extension and retraction speed must not exceed 0.5 m / min. During the extension and retraction process, the windshield position monitoring device monitors the elevation data of each point on the windshield 6 at all times, and this monitoring data is transmitted to the control system in real time. If the elevation difference between different positions of the windshield 6 is greater than 1 cm, the elevation difference is adjusted by controlling the speed of the extension and retraction drive device at different positions to ensure synchronization during the elevation and retraction process.

[0055] The windshield position monitoring device can be any one or more of a distance sensor, an image recognition device, a limit switch, and a displacement sensor. The windshield deployment and retraction drive mechanism 5 can be any one of a pneumatic mechanism, a hydraulic mechanism, a screw drive mechanism, a rack drive mechanism, or a traction mechanism. When the windshield 6 is repositioned, the windshield deployment and retraction drive mechanism is equipped with a limit switch and a stop block in addition to the distance sensor. The distance sensor ensures a safe distance between the windshield 6 and rotating components through distance detection, and the limit switch and stop block further ensure this safe distance.

[0056] Specifically, as shown in Figures 3 to 5, the shaft drive device 4 includes a clamp 46 that is sleeved onto the rotating components of the hydro-generator set located in the waterwheel chamber. The clamp 46 is connected via a dowel bolt 45. A push rod 41 is connected to the clamp 46 via a rotating shaft 44. An adjusting bolt 42 is connected to the push rod 41. A tensioning band 43 is connected between the other end of the adjusting bolt 42 and the clamp 46. The dowel bolt 45 initially secures the clamp 46 to the main shaft 1, creating an initial clamping force between the clamp 46 and the shaft. Once the push rod 41 is installed and a thrust is applied from the far end, the clamping force between the clamp 46 and the main shaft 1 is further increased, providing sufficient friction for the generator shaft to rotate.

[0057] The clamp 46 is made of thin steel plate, chain, steel wire, sling, or any other lightweight, tensile-strength, and non-deformable material. The adjusting bolt 42 allows the angle of the push rod 41 to be adjusted within its adjustable range. During operation, a thrust is applied to the distal end of the push rod 41, causing the fixed end of the push rod 41 to rotate about point c, moving point b to point b'. The tangent point a between the tensioning band 43 and the clamp 46 moves from point a to point a', with a'b' greater than the length of ab. This ensures that the clamp 46 tightens during operation of the shafting drive device 4, maintaining sufficient friction between the clamp 46 and the main shaft 1. The threaded sections at each end of the adjusting bolt 4-2 have opposite threads, allowing for adjustment of the distance between the push rod and the clamp connection. The push rod 41 is designed in accordance with the principle of leverage. The push rod 4-1 connects to the adjusting bolt 43 at multiple points, and the leverage ratio used to adjust the push rod 4-1 is selected based on actual conditions.

[0058] A protective pad 47 is provided between the clamp 46 and the main shaft 1. This pad prevents local sharp corners and protrusions from colliding with the main shaft or causing stress concentration damage during the clamping process. Since the surface of the energy storage shaft is smooth, the pad 47 should be designed and constructed from a material with a sufficient friction coefficient, appropriate hardness, and thickness to drive the rotation of the motor shaft and rotor 3. The annular shaft protective layer can be made of a material such as a high-friction rubber or a lightweight, soft plastic.

[0059] Furthermore, as shown in Figure 6 , the windshield 6 is provided with a conveniently removable observation window 61. This observation window features a reliable, non-magnetic, anti-disturbance, and conveniently accessible opening and closing mechanism. For rotational inspection, the windshield 6 can be left open and inspected by simply opening the observation window 61. The observation window 61 can be transparent or opaque, yet easily removable.

[0060] As shown in FIG7 , the high-frequency inspection method for the rotor of a large-scale high-speed hydro-generator according to this embodiment includes the following steps:

[0061] S1: The generator is stopped, the braking system is in the engaged state, and the electrical isolation protection is activated;

[0062] S2: Install the shaft drive device 4 on the part of the main shaft 1 of the hydro-generator set located in the waterwheel chamber;

[0063] S3: The windshield insertion and retraction drive mechanism 5 drives the windshield 6 to retract;

[0064] S4: The braking system is disengaged and the high-pressure oil jacking system is engaged. The displacement sensor at the end of the generator main shaft 1 detects axial displacement of the main shaft 1, which is generally 0.1 mm. The oil pressure and oil flow output of the high-pressure oil system are stable to ensure that a good lubricating oil film is established between the thrust pad and the mirror plate surface. A good lubricating oil film can effectively reduce rotational friction.

[0065] S5: Use the shaft drive device 4 to drive the generator rotating parts to rotate, and turn the gear to check the safety of the rotating parts and the shaft data;

[0066] S6: Exit the high-pressure oil lifting system, the windshield insertion and retraction drive mechanism 5 drives the windshield 6 to be inserted, and the brake system is inserted;

[0067] S7: Remove the shaft drive device 4.

[0068] In step S3 and step S6, the windshield 6 has the following two ways of being put into operation or withdrawn:

[0069] Method 1: Several windshields 6 arranged along the circumference are cast in and out as a whole, and the windshields 6 are connected to the windshield casting and retraction driving mechanism 5 at least three places on the circumference; a plurality of distance sensors are provided on the frame 2 facing the windshield 6 in the circumference, and the synchronization of the windshield 6 during the casting and retraction process is monitored at any time by the distance sensors. The distance sensors are used to detect the distance between the windshield 6 and the rotating parts after the windshield 6 is cast in, thereby ensuring a safe distance between the moving and static parts.

[0070] Method 2: The windshield 6 is single-petaled and retracted. The windshield 6 is reliably and firmly connected to the windshield retraction drive mechanism 5 to ensure that the state of the windshield 6 is consistent after being retracted. A monitoring device is installed on the frame 2 and its installation position is facing the windshield to be retracted. The distance between the windshield 6 and the rotating part after the windshield 6 is inserted is detected to detect whether the windshield 6 is in place and ensure a safe distance between the moving and static parts.

[0071] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention falls within the scope of protection of the present invention.

Claims

1. A high-frequency inspection system for large-scale high-speed hydro-generator rotors, characterized in that: The invention comprises a shaft system drive device (4) connected to the main shaft (1) of the hydro-generator set and located in the waterwheel chamber, a windshield insertion and retraction drive mechanism (5) installed on the frame (2) of the hydro-generator set, a braking system and a high-pressure oil lifting system acting on rotating parts including the main shaft (1), wherein the output end of the windshield insertion and retraction drive mechanism (5) is connected to a windshield (6) located at the end of the rotor (3).

2. A high-frequency regular inspection system for large-scale high-speed hydro-generator rotors according to claim 1, characterized in that: It also includes a control system and a windshield position monitoring device. The windshield insertion and retraction driving mechanism (5), the braking system, the high-pressure oil lifting system and the windshield position monitoring device are all connected to the control system signal.

3. A high-frequency regular inspection system for large-scale high-speed hydro-generator rotors according to claim 1, characterized in that: The shaft system driving device (4) comprises a clamp (46) sleeved on the main shaft (1) of the hydro-generator set and located in the waterwheel chamber, a push rod (41) is rotatably connected to the clamp (46), an adjusting bolt (42) is connected to the push rod (41), and a tensioning belt (43) is connected between the other end of the adjusting bolt (42) and the clamp (46).

4. A high-frequency regular inspection system for large-scale high-speed hydro-generator rotors according to claim 1, characterized in that: The windshield plate (6) is provided with an observation window (61).

5. A high-frequency regular inspection system for large-scale high-speed hydro-generator rotors according to claim 1, characterized in that: The windshield position monitoring device is any one or more of a distance sensor, an image recognition device, a travel switch, and a displacement sensor.

6. A high-frequency regular inspection system for large-scale high-speed hydro-generator rotors according to claim 1, characterized in that: The windshield throwing and retracting driving mechanism (5) is any one of a pneumatic machine, a hydraulic machine, a screw drive machine, a rack drive machine, and a traction machine.

7. A method for high-frequency inspection of a large-scale high-speed hydraulic generator rotor using a high-frequency inspection system for a large-scale high-speed hydraulic generator rotor as claimed in claim 1, characterized in that: The following steps are involved: S1: The generator is stopped, the braking system is in the engaged state, and the electrical isolation protection is engaged; S2: installing a shaft system drive device (4) on the portion of the main shaft (1) of the hydro-generator set located in the waterwheel chamber; S3: the windshield plate insertion and retraction driving mechanism (5) drives the windshield plate (6) to retract; S4: The brake system is exited and the high-pressure oil lifting system is put into use; S5: using the shaft system drive device (4) to drive the rotating parts of the generator to rotate, and turning the gear to check the safety of the rotating parts and shaft system data; S6: exit the high-pressure oil lifting system, the windshield plate insertion and retraction driving mechanism (5) drives the windshield plate (6) to be inserted, and the brake system is inserted; S7: Remove the shaft drive unit (4).

8. A high-frequency regular inspection method for a large-scale high-speed hydro-generator rotor according to claim 7, characterized in that: In step S3 and step S6, the windshield (6) has the following two modes of being put into operation or withdrawn: Method 1: a whole ring of windshield plates (6) arranged along the circumference are cast and retracted as a whole, the windshield plates (6) are connected to the windshield plate casting and retraction driving mechanism (5) at least at three locations on the circumference, and a windshield plate position monitoring device monitors the synchronization of the whole ring of windshield plates (6) during the casting and retraction process of the windshield plates (6) in real time; Method 2: The windshield (6) is single-petaled and is connected to the windshield driving mechanism (5) at least at three locations.

9. A high-frequency regular inspection method for a large-scale high-speed hydro-generator rotor according to claim 7, characterized in that: In step S3 and step S6, the windshield position monitoring device detects the distance between the windshield (6) and the rotating component after the windshield (6) is thrown in, and detects whether the windshield is in the set position after the throwing and retracting operation.

10. A high-frequency regular inspection method for a large-scale high-speed hydro-generator rotor according to claim 7, characterized in that: In step S4, the establishment status of the thrust bearing lubrication system is determined by means of a displacement sensor fixed to the end of the rotating component and a high-pressure oil jacking system.

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