Method and system for optimizing rotor back through of a steam turbine generator excitation end

Abstract

This invention relates to the field of generator assembly technology, and in particular to an optimized method and system for re-inserting a turbine generator exciter end rotor. An optimized method for re-inserting a turbine generator exciter end rotor includes: installing a lifting point device on the exciter end face of the rotor; after installing the lifting point device, connecting a lifting device to the turbine end of the rotor and a lifting and moving device to the lifting point device; after the lifting device and the lifting and moving device are connected to the rotor, simultaneously operating the lifting device and the lifting and moving device to simultaneously lift the rotor, making the centerline of the rotor collinear with the centerline of the stator; when the centerline of the rotor is collinear with the centerline of the stator, operating the lifting and moving device and translating the rotor along the direction of the rotor's centerline to insert the rotor into the stator.

Description

Technical Field

[0001] This invention relates to the field of generator assembly technology, and in particular to an optimized method and system for back-threading the rotor at the excitation end of a steam turbine generator. Background Technology

[0002] Steam turbine generators are core equipment in thermal and nuclear power plants. During major overhauls, the rotor needs to be removed from the stator cavity for inspection. After the inspection is completed, the rotor needs to be put back into the stator cavity and installed in place. This process of putting it back in is called "rotor reinstallation".

[0003] Traditional methods of rewinding the rotor typically present the following technical challenges: 1. The rotor and stator are easily damaged. Traditional methods use wire ropes and slings to directly bind the rotor journal, which not only easily damages the delicate journal surface, but also makes it easy for the rotor to swing and rotate in the air, making it difficult to accurately control its horizontal and axial position, and posing a huge risk of collision and scratching with the stator core.

[0004] 2. Difficulties in dealing with China During the insertion process, it is necessary to continuously adjust the centerline of the rotor to be consistent with the centerline of the stator bore (i.e., "alignment"). Traditional methods rely on manual adjustment using tools such as pry bars and jacks, which is inefficient, inaccurate, labor-intensive, and unsafe.

[0005] 3. Primarily manual labor, with low standardization. The entire process is highly dependent on the experience and teamwork of crane operators and maintenance personnel. Human factors have a significant impact, the process is not standardized, and safety accidents are prone to occur.

[0006] Therefore, there is an urgent need for a safe, efficient, and standardized method for rewinding rotors. Summary of the Invention

[0007] This invention provides an optimized method and system for back-threading the rotor at the excitation end of a steam turbine generator, which solves the technical problems in the prior art where the rotor is easily damaged, difficult to align, and requires a large amount of manual intervention when back-threading the rotor.

[0008] The above-mentioned objectives of the present invention can be achieved by the following technical solutions: This invention provides an optimized method for inserting a turbine generator exciter end rotor back into the rotor, comprising: installing a lifting point device on the exciter end face of the rotor; after installing the lifting point device, connecting a lifting device to the steam end of the rotor and a lifting and moving device to the lifting point device; after the lifting device and the lifting and moving device are connected to the rotor, operating the lifting device and the lifting and moving device synchronously to lift the rotor synchronously, so that the center line of the rotor is collinear with the center line of the stator; when the center line of the rotor is collinear with the center line of the stator, operating the lifting and moving device and translating the rotor along the center line direction of the rotor to insert the rotor into the stator.

[0009] According to one embodiment of the present invention, before the lifting point device is installed on the excitation end face of the rotor, a protective device is further provided on the inner peripheral wall of the stator.

[0010] According to one embodiment of the present invention, the step of operating the lifting device and translating the rotor along the centerline direction to insert the rotor into the stator when the centerline of the rotor is collinear with the centerline of the stator includes: operating the lifting device and translating the rotor along the centerline direction to gradually insert the rotor into the stator when the centerline of the rotor is collinear with the centerline of the stator; when more than one-third of the rotor has penetrated the stator, placing a support device directly below the steam end of the rotor and abutting it against the side wall of the steam end of the rotor so that the support device supports the steam end of the rotor; after the support device supports the steam end of the rotor, disconnecting the lifting device from the steam end of the rotor; after disconnecting the lifting device from the steam end of the rotor, operating the lifting device and translating the rotor along the centerline direction to insert the rotor into the stator.

[0011] According to one embodiment of the present invention, when the portion of the rotor penetrating the stator exceeds one-third, placing a support device directly below the steam end of the rotor and abutting it against the side wall of the steam end of the rotor so that the support device supports the steam end of the rotor includes: placing a support device directly below the steam end of the rotor and abutting it against the side wall of the steam end of the rotor when the portion of the rotor penetrating the stator exceeds one-third; locking the casters at the bottom of the support device so that the support device supports the steam end of the rotor.

[0012] According to one embodiment of the present invention, the step of operating the lifting and moving device and translating the rotor along the centerline direction of the rotor after disconnecting the connection between the lifting device and the steam end of the rotor to insert the rotor into the stator includes: after disconnecting the connection between the lifting device and the steam end of the rotor, releasing the lock on the caster wheel at the bottom of the support device; after releasing the lock, operating the lifting and moving device and translating the rotor along the centerline direction of the rotor to insert the rotor into the stator.

[0013] According to one embodiment of the present invention, the step of operating the lifting device and translating the rotor along the centerline direction of the rotor after unlocking to insert the rotor into the stator includes: operating the lifting device and translating the rotor along the centerline direction of the rotor after unlocking; during the process of translating the rotor to insert the rotor into the stator, continuously illuminating the gap between the inner peripheral wall of the stator and the outer peripheral wall of the rotor with a light source along the axial direction of the rotor, and determining whether the rotor is always aligned during translation by observing the change of the light from the light source in the gap.

[0014] The present invention also provides a rewinding system based on the optimized method for rewinding the turbine generator exciter end rotor as described in claims 1 to 6, comprising a lifting point device; the lifting point device comprising a support unit, a connecting unit, and a lifting lug; the connecting unit being disposed on the support unit for connecting the end face of the exciter end of the rotor; the lifting lug being disposed on the support unit for connection by the lifting point device.

[0015] According to one embodiment of the present invention, the connecting unit includes a centering flange and fasteners; the centering flange has a plurality of fastener through holes, which are arranged at intervals along the circumference of the centering flange; the end face of the excitation end of the rotor has a plurality of fastener through holes; when the centering flange and the rotor are coaxially arranged, and the plurality of fastener through holes correspond one-to-one with the plurality of fastener through holes, the fasteners are inserted through the fastener through holes into the fastener through holes.

[0016] According to one embodiment of the present invention, a support device is further included, the support device comprising a base, a lifting unit, a support bracket, and locking casters; the lifting unit is disposed on the top of the base and is used to adjust the height of the support bracket; the support bracket is disposed on the top of the lifting unit and is used to support the steam end of the rotor; the locking casters are disposed on the bottom of the base.

[0017] According to one embodiment of the present invention, the support has an arcuate surface, and when the steam end of the rotor is placed on the arcuate surface, the arcuate surface is in contact with the outer peripheral wall of the steam end of the rotor.

[0018] The features and advantages of the optimized method and system for re-running the rotor at the excitation end of a steam turbine generator according to the present invention are as follows: An I-beam rail can be securely installed above the turbine generator platform (or on a pre-set anchor point / temporarily erected sturdy support), and the lifting device (the electric traction hoist) can be suspended on this I-beam rail. The lifting point device is directly fixed to the excitation end face of the rotor, providing a dedicated central force point for the rotor and avoiding damage caused by binding the rotor journal with wire ropes. At the same time, the lifting device is synchronously lifted by the lifting devices (such as the main trolley on site) connected to both ends of the rotor. The commanding personnel can observe and coordinate the height of both ends to keep the rotor horizontal in the suspended state. The coaxial alignment of the rotor and stator is directly completed by mechanical lifting, which improves the alignment efficiency and reduces the interference of human factors. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Fig. 1 A flowchart illustrating an optimized method for rewinding the rotor at the excitation end of a steam turbine generator according to the present invention; Fig. 2 This is a schematic diagram of the rotor being routed back through; Fig. 3 This is a perspective view of the lifting point device of the present invention; Fig. 4 This is a perspective view of the support device of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Stator; 2. Rotor; 3. Lifting point device; 31. Support unit; 32. Connecting unit; 33. Lifting lug; 4. Support device; 41. Base; 42. Lifting unit; 43. Support bracket. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, 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," and "counterclockwise," etc., 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 invention 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 limiting this invention.

[0024] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Implementation Method 1 like Figs. 1 to 4 As shown, the present invention provides an optimized method for inserting a turbine generator excitation end rotor 2 back into the rotor 2, comprising: installing a lifting point device 3 on the excitation end face of the rotor 2; after installing the lifting point device 3, connecting a lifting device to the steam end of the rotor 2 and connecting a lifting and moving device to the lifting point device 3; after the lifting device and the lifting and moving device are connected to the rotor 2, operating the lifting device and the lifting and moving device simultaneously to lift the rotor 2 simultaneously, so that the center line of the rotor 2 is collinear with the center line of the stator 1; when the center line of the rotor 2 is collinear with the center line of the stator 1, operating the lifting and moving device and translating the rotor 2 along the center line direction of the rotor 2 to insert the rotor 2 into the stator 1.

[0026] In practice, an I-beam rail can be securely installed above the turbine generator platform (or on a pre-set anchor point / temporarily erected sturdy support), and the lifting device (electric traction hoist) can be suspended on the I-beam rail. The lifting point device 3 is directly fixed to the excitation end face of the rotor 2, providing a dedicated central force point for the rotor 2, avoiding damage caused by using wire ropes to bind the rotor 2 journals; at the same time, the lifting device (such as the main trolley on site) connected to both ends of the rotor 2 can be used for synchronous lifting operations with the lifting device. The command personnel can observe and coordinate the height of both ends to keep the rotor 2 horizontal in the suspended state. The coaxial alignment of the rotor 2 and the stator 1 can be directly completed by mechanical lifting, which improves the alignment efficiency and reduces the interference of human factors.

[0027] According to one embodiment of the present invention, before installing the lifting point device 3 on the excitation end face of the rotor 2, the method further includes: laying a protective device on the inner peripheral wall of the stator 1.

[0028] In practice, before the rotor 2 penetrates into the stator 1, the protective device covers the inner peripheral wall surface of the stator 1. If the rotor 2 deviates slightly during the translational insertion process, the outer peripheral wall of the rotor 2 will first contact the protective device, thus preventing the rotor 2 from directly rubbing or colliding with the iron core inside the stator 1.

[0029] In this embodiment, the protective device can be a plate-like structure made of rubber, or a protective sliding plate.

[0030] According to one embodiment of the present invention, when the centerline of the rotor 2 is collinear with the centerline of the stator 1, the lifting device is operated and the rotor 2 is translated along the centerline direction of the rotor 2 to insert the rotor 2 into the stator 1. This includes: when the centerline of the rotor 2 is collinear with the centerline of the stator 1, the lifting device is operated and the rotor 2 is translated along the centerline direction of the rotor 2 to gradually insert the rotor 2 into the stator 1; when more than one-third (e.g., one-third to one-half) of the rotor 2 has penetrated into the stator 1, a support device 4 is placed directly below the steam end of the rotor 2 and is made to fit against the side wall of the steam end of the rotor 2 so that the support device 4 supports the steam end of the rotor 2; after the support device 4 supports the steam end of the rotor 2, the connection between the lifting device and the steam end of the rotor 2 is released; after the connection between the lifting device and the steam end of the rotor 2 is released, the lifting device is operated and the rotor 2 is translated along the centerline direction of the rotor 2 to insert the rotor 2 into the stator 1.

[0031] In practice, by setting up the seamless conversion process of "double lifting to single traction + dynamic hydraulic support" as described above, the technical problems of rotor 2 falling at the steam end due to the rearward shift of the center of gravity and lack of effective continuous support when it is inserted too deeply are completely solved. This ensures a smooth transition of the force conversion process of rotor 2 and prevents rotor 2 from suddenly sinking and damaging the equipment. The subsequent insertion process is entirely provided with axial traction by the lifting and moving device, and radial support and follow-up movement by the support device 4.

[0032] According to one embodiment of the present invention, when the rotor 2 penetrates more than one-third of the stator 1, a support device 4 is placed directly below the steam end of the rotor 2 and is made to fit against the side wall of the steam end of the rotor 2 so that the support device 4 supports the steam end of the rotor 2. This includes: when the rotor 2 penetrates more than one-third of the stator 1, placing the support device 4 directly below the steam end of the rotor 2 and making it fit against the side wall of the steam end of the rotor 2; locking the universal wheel (with braking function) at the bottom of the support device 4 so that the support device 4 supports the steam end of the rotor 2.

[0033] In practice, the locked casters restrict the movement of the support device 4 on the ground, ensuring that the support device 4 can provide a stable and static vertical support force at the moment of force transfer when the connection of the lifting device (main trolley) is disconnected.

[0034] According to one embodiment of the present invention, after disconnecting the connection between the lifting device and the steam end of the rotor 2, the lifting and moving device is operated, and the rotor 2 is translated along the centerline direction of the rotor 2 to insert the rotor 2 into the stator 1. This includes: after disconnecting the connection between the lifting device and the steam end of the rotor 2, releasing the lock on the caster wheel at the bottom of the support device 4; after releasing the lock, operating the lifting and moving device, and translating the rotor 2 along the centerline direction of the rotor 2 to insert the rotor 2 into the stator 1.

[0035] In practice, by setting the above steps, the omnidirectional wheels regain their rolling ability after being unlocked (brake released). When the lifting device pulls the rotor 2 forward, the support device 4 acts as a movable, load-bearing intelligent base. It uses the omnidirectional wheels to roll forward synchronously with the rotor 2 on the ground, realizing one-time insertion and continuous operation, eliminating the pauses and risks caused by traditional multiple support changes.

[0036] According to one embodiment of the present invention, after unlocking, the lifting device is operated and the rotor 2 is translated along the centerline direction of the rotor 2 to insert the rotor 2 into the stator 1. This includes: after unlocking, operating the lifting device and translating the rotor 2 along the centerline direction of the rotor 2; during the process of translating the rotor 2 to insert the rotor 2 into the stator 1, a light source is used to continuously irradiate the gap between the inner peripheral wall of the stator 1 and the outer peripheral wall of the rotor 2 along the axial direction of the rotor 2, and the change of the light from the light source in the gap is observed to determine whether the translation is always aligned.

[0037] In practice, because the light from a light source (such as a high-powered flashlight) penetrates the annular space between the stator and rotor 2 (i.e., light penetration method), when the rotor 2 is tilted, the shape and size of the gap will change, thereby blocking or altering the light transmission state. This provides the operator with real-time internal visual feedback, making it easy to detect and correct centerline deviations during translation, preventing internal scratches caused by blind spots. After the rotor 2 is pulled to its final installation position, the support device 4 and the lifting device are removed, and the lifting point device 3 is disassembled, thus completing the entire re-installation work.

[0038] Implementation Method 2 The present invention also provides a back-through system for an optimized method of back-through rotor 2 at the excitation end of a steam turbine generator based on Embodiment 1, including a lifting point device 3; the lifting point device 3 includes a support unit 31, a connecting unit 32 and a lifting lug 33; the connecting unit 32 is disposed on the support unit 31 and is used to connect the end face of the excitation end of the rotor 2; the lifting lug 33 is disposed on the support unit 31 and is used for connection by the lifting point device 3.

[0039] In practice, the connecting unit 32 serves as an interface to rigidly fix the support unit 31 to the excitation end face of the rotor 2, while the lifting lug 33 provides a standard attachment point for external lifting and moving devices.

[0040] In some implementations, there may be multiple lugs 33.

[0041] According to one embodiment of the present invention, the connecting unit 32 includes a centering flange and fasteners (e.g., high-strength bolts); the centering flange has a plurality of fastener through holes, which are arranged at intervals along the circumference of the centering flange; the end face of the excitation end of the rotor 2 has a plurality of fastener through holes; when the centering flange and the rotor 2 are coaxially arranged, and the plurality of fastener through holes correspond one-to-one with the plurality of fastener through holes, the fasteners are inserted into the fastener through holes through the fastener through holes.

[0042] In practical implementation, since the excitation end of rotor 2 is circular, setting the connecting unit 32 as a flange structure allows it to match the shape of the excitation end of rotor 2. By using the correspondence between the fastener through holes and the fastener insertion holes, the relative positions of the two can be confirmed, thereby achieving precise alignment; at the same time, the fasteners ensure the connection strength between the alignment flange and the excitation end.

[0043] According to one embodiment of the present invention, it further includes a support device 4, which includes a base 41, a lifting unit 42, a support bracket 43 (or an arc-shaped support plate) and a locking universal wheel; the lifting unit 42 is disposed on the top of the base 41 and is used to adjust the height of the support bracket 43; the support bracket 43 is disposed on the top of the lifting unit 42 and is used to support the steam end of the rotor 2; the locking universal wheel is disposed on the bottom of the base 41.

[0044] In practice, the vertical adjustment of the lifting unit 42 enables the support bracket 43 to move upward, precisely connecting with and supporting the air end of the suspended rotor 2. The locking universal wheels at the bottom serve both as parking and lateral movement functions of the support device 4, achieving a support effect that is height-adjustable and mobile.

[0045] In this embodiment, the lifting unit 42 can be a hydraulic jack or other lifting structure with a height locking mechanism.

[0046] According to one embodiment of the present invention, the support 43 has an arcuate surface, and when the steam end of the rotor 2 is placed on the arcuate surface, the arcuate surface is in contact with the outer peripheral wall of the steam end of the rotor 2.

[0047] In practice, the arc-shaped surface structure increases the contact area between the support bracket 43 and the outer peripheral wall of the steam end of the rotor 2, distributing the compressive stress generated by the weight of the rotor 2 evenly on the arc-shaped surface. This avoids localized stress concentration caused by using planar or rigid point supports, and prevents mechanical damage such as indentations from appearing on the outer surface of the steam end of the rotor 2.

[0048] According to one embodiment of the present invention, the curved surface is lined with a copper-based or nylon-based soft material.

[0049] In summary, the present invention has at least the following features and advantages: (1) Safety revolution and force system optimization: The special lifting point device 3 transfers the lifting point from the "journal" to the "shaft end" and directly fixes it on the process hole of the excitation end face of the rotor 2, providing a special central force point for the rotor 2. This completely avoids the stress concentration and surface damage caused by directly binding the journal of the rotor 2 with wire rope or sling, and fundamentally eliminates the swinging and rotation of the rotor 2 in the air.

[0050] (2) Process Restructuring and Collaborative Control: The innovative "dual-lift to single-traction + dynamic hydraulic support" seamless conversion process is adopted. Initially, the main trolley and electric traction hoist are used for synchronous lifting operations to keep the rotor 2 horizontal in the suspended state; after entering the core insertion stage, the electric traction hoist provides a constant and uniform axial traction force, realizing the mechanization and controllability (millimeter-level feed) of the rotor 2 insertion process.

[0051] (3) Smooth and follow-up support transition: The support device 4, as a "dynamic hydraulic support platform," replaces the traditional sleepers and jacks. At the moment the center of gravity of the rotor 2 shifts, the support device 4 can smoothly and without impact support the steam end journal, and after unlocking, it moves forward with the rotor 2 using the casters. This achieves continuous operation with a single insertion, eliminating the huge risks of pauses and sudden sinking caused by multiple support transitions.

[0052] (4) Standardized operation and cost reduction and efficiency improvement: The complete set of special tools and processes of this invention transforms the traditional extensive, experience-based, and labor-intensive operation method into a refined, controllable, and technology-intensive operation method. It greatly reduces the over-reliance on a large number of manual laborers and the experience of senior crane operators, reduces labor intensity, and shortens the maintenance period.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optimized method for re-inserting the rotor (2) at the excitation end of a steam turbine generator, characterized in that, include: Install the lifting point device (3) on the excitation end face of the rotor (2); After the lifting point device (3) is installed, the lifting device is connected to the steam end of the rotor (2), and the lifting and moving device is connected to the lifting point device (3); After the lifting device and the lifting and moving device are connected to the rotor (2), the lifting device and the lifting and moving device are operated synchronously to lift the rotor (2) synchronously, so that the center line of the rotor (2) is collinear with the center line of the stator (1); When the centerline of the rotor (2) is collinear with the centerline of the stator (1), the lifting device is operated and the rotor (2) is translated along the centerline direction of the rotor (2) to insert the rotor (2) into the stator (1).

2. The optimized method for re-inserting the rotor (2) at the excitation end of a steam turbine generator according to claim 1, characterized in that, Before installing the lifting point device (3) on the excitation end face of the rotor (2), the method further includes: A protective device is laid on the inner peripheral wall of the stator (1).

3. The optimized method for re-inserting the rotor (2) at the excitation end of a steam turbine generator according to claim 1, characterized in that, When the centerline of the rotor (2) is collinear with the centerline of the stator (1), the lifting device is operated, and the rotor (2) is translated along the centerline direction of the rotor (2) to insert the rotor (2) into the stator (1), including: When the center line of the rotor (2) is collinear with the center line of the stator (1), the lifting device is operated and the rotor (2) is translated along the center line direction of the rotor (2) to gradually insert the rotor (2) into the stator (1). When more than one-third of the rotor (2) penetrates the stator (1), a support device (4) is placed directly below the steam end of the rotor (2) and is made to fit against the side wall of the steam end of the rotor (2) so that the support device (4) supports the steam end of the rotor (2). After the support device (4) supports the steam end of the rotor (2), the connection between the lifting device and the steam end of the rotor (2) is released. After disconnecting the lifting device from the steam end of the rotor (2), the lifting device is operated and the rotor (2) is translated along the center line of the rotor (2) to insert the rotor (2) into the stator (1).

4. The optimized method for re-inserting the rotor (2) at the excitation end of a steam turbine generator according to claim 3, characterized in that, When more than one-third of the rotor (2) penetrates the stator (1), a support device (4) is placed directly below the steam end of the rotor (2) and made to fit against the side wall of the steam end of the rotor (2) so that the support device (4) supports the steam end of the rotor (2), including: When more than one-third of the rotor (2) penetrates the stator (1), a support device (4) is placed directly below the steam end of the rotor (2) and is made to fit against the side wall of the steam end of the rotor (2); Lock the casters at the bottom of the support device (4) so ​​that the support device (4) supports the steam end of the rotor (2).

5. The optimized method for re-inserting the rotor (2) at the excitation end of a steam turbine generator according to claim 4, characterized in that, After disconnecting the lifting device from the steam end of the rotor (2), the operator moves the lifting device and translates the rotor (2) along the centerline direction to insert the rotor (2) into the stator (1), including: After disconnecting the connection between the lifting device and the steam end of the rotor (2), release the lock on the caster at the bottom of the support device (4); After unlocking, operate the lifting device and translate the rotor (2) along the center line direction of the rotor (2) to insert the rotor (2) into the stator (1).

6. The optimized method for re-inserting the rotor (2) at the excitation end of a steam turbine generator according to claim 5, characterized in that, After unlocking, operating the lifting device and translating the rotor (2) along the centerline direction to insert the rotor (2) into the stator (1) includes: After unlocking, operate the lifting device and translate the rotor (2) along the center line direction of the rotor (2). During the process of translating the rotor (2) to insert the rotor (2) into the stator (1), the gap between the inner peripheral wall of the stator (1) and the outer peripheral wall of the rotor (2) is continuously irradiated by a light source along the axial direction of the rotor (2). The change of the light from the light source in the gap is observed to determine whether the rotor is always aligned during the translation.

7. A return-through system based on the optimized method for returning the turbine generator excitation end rotor (2) as described in claims 1 to 6, characterized in that, Including the lifting point device (3); The lifting point device (3) includes a support unit (31), a connecting unit (32), and a lifting lug (33); The connecting unit (32) is disposed on the support unit (31) and is used to connect the end face of the excitation end of the rotor (2); The lifting lug (33) is mounted on the support unit (31) for connection to the lifting point device (3).

8. The loopback system according to claim 7, characterized in that, The connecting unit (32) includes a centering flange and fasteners; The centering flange has multiple fastener through holes, which are arranged at intervals along the circumference of the centering flange. The end face of the excitation end of the rotor (2) has multiple fastener through holes; When the centering flange is coaxially arranged with the rotor (2), and the multiple fastener through holes correspond one-to-one with the multiple fastener through holes, the fastener is inserted through the fastener through holes into the fastener through holes.

9. The loopback system according to claim 7, characterized in that, It also includes a support device (4), which includes a base (41), a lifting unit (42), a support bracket (43), and locking casters; The lifting unit (42) is located on the top of the base (41) and is used to adjust the height of the support bracket (43); The support bracket (43) is disposed on the top of the lifting unit (42) and is used to support the steam end of the rotor (2); The locking casters are located at the bottom of the base (41).

10. The loopback system according to claim 9, characterized in that, The support bracket (43) has an arc-shaped surface. When the steam end of the rotor (2) is placed on the arc-shaped surface, the arc-shaped surface is in contact with the outer peripheral wall of the steam end of the rotor (2).

Images