125mw double water-cooled generator rotor sheath grabbing device

Abstract

The utility model relates to 125MW double water -cooled generator maintenance technical field discloses a kind of 125MW double water -cooled generator rotor sheath gripping device, the device mainly includes two major main body structures of stress holding sleeve and hoisting holding sleeve, wherein hoisting holding sleeve is adapted to be installed in sheath outer side wall, can be completed hoisting operation in cooperation with crown block;Stress holding sleeve is assembled in sheath root and forms limit cooperation with sheath, at least two stress pull rod assemblies are symmetrically arranged on stress holding sleeve;The stress pull rod assembly end connects end stress plate, hydraulic jack is assembled in end stress plate inside, hydraulic jack piston end can be towards rotor shaft head part and exert pushing external force;The utility model can make sheath stress keep uniform under hot state working condition, guarantee construction quality, rely on the structural stability of mechanical component, improve operation efficiency, improve the defect that force exertion strength is uneven, force exertion direction is prone to deviation, reduce the labor intensity of operator.

Description

Technical Field

[0001] This utility model relates to the field of maintenance technology for 125MW dual water-cooled generators, and in particular to a rotor sleeve gripping device for 125MW dual water-cooled generators. Background Technology

[0002] The 125MW dual water-cooled generator is a key piece of equipment in small and medium-sized generator sets. The generator rotor is the core component of the generator, and the sheath is a crucial component that protects the internal armature at the rotor end. During operation, it must not loosen as the temperature rises, and the interference fit between the sheath and the rotor body is as high as 1.2mm. Furthermore, 48 nested teeth are evenly distributed around the entire circumference of the sheath root, making disassembly and assembly particularly difficult. The sheath must be rapidly heated to the set disassembly and assembly temperature, and then external force is applied to partially detach the sheath. Finally, the sheath is rotated to complete the gripping operation.

[0003] Traditional disassembly methods mainly involve rapidly heating the material and then tapping the edges of the sheath with tools such as a copper hammer. This method relies entirely on the operator's experience and is prone to uneven force and deviation in direction. At best, uneven force can cause deformation of the sheath; at worst, uneven force can cause jamming, making disassembly impossible. The sheath must be reheated and reinstalled, and then disassembled again after cooling, which affects the project schedule and has a negative impact on quality. Utility Model Content

[0004] The purpose of this invention is to provide a 125MW dual water-cooled generator rotor sheath gripping device, which effectively solves the problems of uneven force and easy deviation in direction of the traditional dismantling method mentioned in the background art.

[0005] The technical solution adopted in this utility model is as follows: A 125MW dual water-cooled generator rotor sheath gripping device includes a force-bearing clamping sleeve and a lifting clamping sleeve. The lifting clamping sleeve is used to install onto the outer wall of the sheath and is used in conjunction with an overhead crane. The force-bearing clamping sleeve is used to install onto the root of the sheath and forms a limit with the sheath. Two force-bearing tie rod assemblies are installed on the force-bearing clamping sleeve and are arranged symmetrically. The end of the force-bearing tie rod assembly is connected to an end force plate, and the inner wall of the end force plate is connected to a hydraulic jack. The piston end of the hydraulic jack is used to apply external force to the rotor shaft head.

[0006] The force-bearing clamping sleeve includes a first hoop, which is semi-arc in shape. Two first hoops together form a complete annular cavity, which is clearance-fitted with the outer circumference of the generator rotor. The end face of the first hoop abuts against the end face of the sheath, forming a limiting position. A semi-arc-shaped limiting plate is provided on the outer wall of the first hoop, protruding along the axial direction of the first hoop and fitting with the outer wall of the sheath. The mating ends of the two first hoops extend outward to form first lug flanges, which are fixed by two sets of first locking bolt assemblies. First annular lifting lugs are fixedly connected at symmetrical positions above and below the circumference of the limiting plate.

[0007] The lifting clamping sleeve includes a second hoop, which is semi-arc in shape. The two second hoops together form a complete annular cavity, which is tightly clamped to the outer periphery of the sheath. The mating ends of the two second hoops extend outward to form second lug flanges, and the two mating second lug flanges are fixed by two sets of second locking bolt assemblies. Second annular lifting lugs are fixedly connected to the circumferential positions of the second hoops.

[0008] The load-bearing tie rod assembly includes a tie rod body, a fork-shaped double-ear connector, and an externally threaded end. The tie rod body is a long, straight rod structure and serves as the main load-bearing base, bearing axial tensile force. One end of the tie rod body is equipped with a fork-shaped double-ear connector, on which a through bolt hole is formed. The bolt of the first locking bolt assembly passes through the bolt hole to complete the hinged assembly. The other end of the tie rod body is machined with an externally threaded end, which is used to fit a locking nut, thereby achieving the connection and fixation between the tie rod body and the end load-bearing plate.

[0009] The end bearing plate is rectangular in shape, and a boss bearing key is provided on the outer wall of the end bearing plate; the boss bearing key is used to withstand shear force; two through connection mounting holes are distributed on the end bearing plate, respectively arranged on both sides of the boss bearing key; the connection mounting holes are used to pass through the external thread end of the tie rod body.

[0010] The beneficial effects of this utility model are as follows: This device is suitable for the disassembly of the rotor sleeve of a 125MW dual water-cooled generator. It adopts a split clamping structure and a symmetrically arranged force transmission structure. Relying on the symmetrical locking arrangement of the first and second hoops, the sleeve is subjected to uniform circumferential force during disassembly and assembly. This effectively solves the problems of uneven force application and easy deviation of force direction in traditional disassembly operations, and prevents the sleeve and rotor nested meshing teeth from bumping, squeezing, and deforming. It effectively ensures the assembly accuracy of the equipment and the quality of on-site construction. The force-bearing tie rod assembly of the device adopts a fork-type double-ear hinge structure, which can adapt to the angle of assembly deviation during operation and avoid additional bending moment generated by rigid connection. With the adjustable connection section, it can compensate for conventional assembly distance errors by screwing, and can also adopt a plug-in heavy-duty adjustment structure with a stop hole and a limit pin to meet the requirements of high tensile conditions. It eliminates the situation of thread stripping failure under heavy load conditions, and has a wider range of structural adaptability and higher operational stability. The boss-shaped force-bearing key on the end bearing plate can effectively withstand shear loads during operation, further enhancing the structural strength and stability of the overall force-bearing system. Simultaneously, a protective assembly consisting of an iron chain and a detachable locking joint is added to the outside of the tie rod, providing a safety feature in case of failure of the main load-bearing structure, significantly improving operational safety. Through the precise coordination of various mechanical structures, this device can smoothly complete the entire continuous operation of heating the sheath, creating a gap by pushing the rotor shaft head, slightly rotating and disengaging the meshing teeth, and hoisting and removing the entire sheath. This simplifies the traditional disassembly process, improves the efficiency of sheath disassembly, reduces manual intervention, lowers the labor intensity of operators, and reliably meets the hot disassembly and maintenance requirements of this type of generator rotor sheath. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0012] Figure 2 This is a top view of the structure of this utility model.

[0013] Figure 3 This is a three-dimensional structural diagram of the sheath and generator rotor of this utility model after disassembly.

[0014] Figure 4 This is a schematic diagram of the three-dimensional structure of the force-bearing clamping sleeve.

[0015] Figure 5 A three-dimensional structural diagram of the hoisting clamp.

[0016] Figure 6 This is a three-dimensional structural diagram of the tension rod assembly.

[0017] Figure 7 This is a three-dimensional structural diagram of a limit pin.

[0018] Figure 8 This is a three-dimensional structural diagram of the rod joint and the main rod.

[0019] Figure 9 This is a top view of the protective components.

[0020] Figure 10 This is a schematic diagram of the three-dimensional structure of the iron chain.

[0021] In the diagram: 1. Load-bearing clamping sleeve; 2. Lifting clamping sleeve; 3. Protective sleeve; 4. Load-bearing tie rod assembly; 5. End load-bearing plate; 6. Hydraulic jack; 7. Rotor shaft head; 8. Generator rotor; 9. First hoop; 10. Limiting plate; 11. First lug flange; 12. First locking bolt assembly; 13. First annular lifting lug; 14. Second hoop; 15. Second lug flange; 16. Second locking bolt assembly; 17. Second annular lifting lug; 18. 19. Pull rod body; 20. Fork-type double-ear connector; 21. External thread end; 22. Bolt hole; 23. Locking nut; 24. Adjusting connection section; 25. Rod joint; 26. Main rod body; 27. Limiting pin; 28. Cotter pin; 29. ​​Positioning hole; 30. Adjusting sleeve; 31. Through hole; 32. Pin hole; 33. Boss force key; 34. Connection mounting hole; 35. Protective component; 36. Chain; 37. Connection end; 38. Detachable locking connector. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings. The following description is only used to illustrate the technical solution of this utility model and is not intended to limit it.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," etc., 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, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] like Figure 1-3As shown in Embodiment 1, a 125MW dual water-cooled generator rotor sheath gripping device includes a force-bearing clamping sleeve 1 and a lifting clamping sleeve 2. The lifting clamping sleeve 2 is used to install onto the outer wall of the sheath 3 and is used in conjunction with an overhead crane. The force-bearing clamping sleeve 1 is used to install onto the root of the sheath 3 and forms a limiting position with the sheath 3. A force-bearing tie rod assembly 4 is installed on the force-bearing clamping sleeve 1. The number of force-bearing tie rod assemblies 4 is at least two, and three or four force-bearing tie rod assemblies can also be set and evenly and symmetrically arranged around the root of the sheath. In this embodiment, two force-bearing tie rod assemblies 4 are provided. The end of the force-bearing tie rod assembly 4 is connected to an end force plate 5. The inner wall of the end force plate 5 is connected to a hydraulic jack 6. The piston end of the hydraulic jack 6 is used to apply external force to the rotor shaft head 7. After the gripping device is installed, the heating equipment is used to quickly heat the sheath 3 to the set temperature. Then, the hydraulic jack 6 applies external force to the rotor shaft head 7. Under force, the sheath 3 separates from the root and forms a gap with the nested teeth of the generator rotor 8, allowing it to rotate and disengage. Then, the overhead crane applies external force to the hoisting clamping sleeve 2 and rotates it at a small angle, realizing the disengagement of the meshing teeth. At this point, the sheath 3 can be quickly lifted away from the generator rotor 8. This device can maintain the uniform force on the sheath 3 to the maximum extent under heat, ensuring construction quality. At the same time, thanks to the stability of the mechanical components, it can greatly improve work efficiency, fundamentally solve the problems of uneven force and easy deviation in direction, and greatly reduce the labor intensity of the operators.

[0025] like Figure 4 As shown, as an optimization of Embodiment 1, the force-bearing clamping sleeve 1 includes a first hoop 9, which is semi-arc in shape. Two first hoops 9 together form a complete annular cavity, which is clearance-fitted with the outer circumference of the generator rotor 8. The end face of the first hoop 9 abuts against the end face of the sheath 3, forming a limiting position. A semi-arc limiting plate 10 is provided on the outer wall of the first hoop 9. The axial dimension of the limiting plate 10 is larger than the axial dimension of the first hoop 9, meaning the limiting plate 10 protrudes along the axial direction of the first hoop 9. The limiting plate 10 and the sheath 3... The outer wall of sleeve 3 is adapted to achieve circumferential fitting and positioning; the mating ends of the two first hoop bodies 9 extend outward to form first lug flanges 11, and the two mating first lug flanges 11 are fixed by two sets of first locking bolt assemblies 12; each set of first locking bolt assemblies 12 includes a combination of bolt, nut, and washer, and the bolt passes through the first lug flanges 11 on both sides. By tightening the nut, the two semi-arc first hoop bodies 9 are driven to move closer and contract towards each other, locking and fixing the sleeve 3 and limiting its lateral position; the two locking points are symmetrically arranged to ensure uniform circumferential force.

[0026] like Figure 4 As shown, as an optimization of Embodiment 1, first annular lifting lugs 13 are fixedly connected to the upper and lower symmetrical positions of the ring of the limiting plate 10 respectively; the first annular lifting lugs 13 protrude from the outer circle of the limiting plate 10 and can be used for hoisting, pulling and transmitting axial loads.

[0027] like Figure 5 As shown, as an optimization of Embodiment 1, the hoisting clamping sleeve 2 includes a second hoop 14, which is semi-arc in shape. The two second hoops 14 together form a complete annular cavity, which is tightly clamped to the outer periphery of the sheath 3. The mating ends of the two second hoops 14 extend outward to form second lug flanges 15. The two mating second lug flanges 15 are fixed by two sets of second locking bolt assemblies 16. Each set of second locking bolt assemblies 16 includes a bolt, nut, and washer combination. The bolt passes through the second lug flanges 15 on both sides. By tightening the nut, the two semi-arc second hoops 14 are driven to move closer and contract to each other, locking and fixing the sheath 3. The two locking points are symmetrically arranged to ensure uniform circumferential force.

[0028] like Figure 5 As shown, as an optimization of Embodiment 1, second annular lifting lugs 17 are fixedly connected to the symmetrical positions of the ring on the second hoop 14. The second annular lifting lugs 17 protrude from the outer circle of the second hoop 14 and can be used for hoisting, pulling, and transmitting axial loads, so that the hoisting clamping sleeve 2 can both achieve radial clamping and fixation and bear axial tension, thus realizing the function of force transmission.

[0029] like Figure 6 As shown, as an optimization of Embodiment 1, the force-bearing tie rod assembly 4 includes a tie rod body 18, a fork-shaped double-ear joint 19, and an externally threaded end 20. The tie rod body 18 is a long straight rod structure and is the main load-bearing base, bearing axial tensile force. One end of the tie rod body 18 is provided with a fork-shaped double-ear joint 19, and a through bolt hole 21 is opened on the fork-shaped double-ear joint 19. The bolt of the first locking bolt assembly 12 passes through the bolt hole 21 to complete the hinged assembly. The other end of the tie rod body 18 is machined with an externally threaded end 20, which is used to match the locking nut 22 to realize the connection and fixation between the tie rod body 18 and the end force-bearing plate 5. Beneficial effects: The fork-shaped double-ear hinged structure allows for a certain angle of swing, avoiding additional bending moment caused by hard connection; the paired arrangement results in balanced force distribution, can reliably transmit axial tensile force, and is convenient for disassembly and assembly.

[0030] like Figure 6 As shown, as an optimization of Embodiment 1, an adjustment connecting section 23 is provided at one end of the pull rod 18 near the fork-shaped double-ear connector 19.

[0031] like Figure 6 As shown, the first type of adjustment structure adopts a threaded connection structure, which can realize the overall length adjustment of the pull rod body 18 by turning, and can change the effective working length of the pull rod body 18 to adapt to the assembly distance error.

[0032] like Figure 7 and 8As shown, the second adjustment structure includes a rod joint 24, a main rod 25, a limiting pin 26, and a cotter pin 27. One end of the rod joint 24 is fixedly connected to a fork-shaped double-eared joint 19, and multiple positioning holes 28 are arranged at intervals on the side wall of the rod joint 24. One end of the main rod 25 is provided with an adjusting sleeve 29, which is a hollow cylindrical structure. The rod joint 24 can slide axially along the inside of the adjusting sleeve 29. The cylindrical wall of the adjusting sleeve 29 has through holes 30 that match the positioning holes 28. The limiting pin 26 radially penetrates the cylindrical wall of the adjusting sleeve 29 and the positioning holes 28 on the rod joint 24, radially inserting and positioning the adjusting sleeve 29 and the rod joint 24 to transmit axial tension and withstand shear loads. The protruding end of the limiting pin 26 is provided with a pin hole 31, and the cotter pin 27 passes through the pin hole 31 to complete the anti-detachment assembly; the cotter pin 27 limits the limiting pin 26 to prevent it from moving and falling off due to vibration and impact during operation, ensuring the reliability of the connection. Beneficial effects: The length adjustment is achieved by using a stop hole-pin fit, which has a strong load-bearing capacity and can withstand large axial tensile forces; the structure is simple and reliable, and disassembly and assembly are convenient. Compared with threaded adjustment, it is less prone to thread stripping failure under heavy load conditions.

[0033] like Figure 9 As shown, as an optimization of Embodiment 1, the end force plate 5 is rectangular in shape, and a boss force key 32 is provided on the outer wall of the end force plate 5; the boss force key 32 is used to bear shear force; two through connection mounting holes 33 are distributed on the end force plate 5, respectively arranged on both sides of the boss force key 32; the connection mounting holes 33 are used to pass through the external thread end 20 of the tie rod body 18.

[0034] like Figure 9 and 10As shown, as an optimization of Embodiment 1, a protective component 34 is installed on the outside of the pull rod 18, including a chain 35, a connecting end 36, and a detachable locking connector 37. One end of the chain 35 is equipped with the connecting end 36, which is firmly connected to the right pull rod 18 of the adjusting connecting section 23. The other end of the chain 35 is equipped with a detachable locking connector 37, which is a bolt and nut structure. The nut is welded to the pull rod 18, and the bolt passes through the chain 35 and is threadedly connected to the nut. When it is necessary to adjust the length of the pull rod 18, the detachable locking connector 37 can be released to release the constraint of the chain 35, making it easier to complete the length adjustment operation of the pull rod 18. After the adjustment is completed, the detachable locking connector 37 is re-engaged, so that the chain 35 spans between the two components of the adjusting connecting section 23. The chain 35 is composed of multiple sets of chain links that are hinged and connected in sequence, and has the characteristics of flexibility and bendability. The chain 35 is arranged parallel to the outside of the pull rod 18. The beneficial effects are: the chain 35 serves as a secondary safety protection structure, which plays a role in preventing the pull rod 18 from falling off after the main load-bearing structure fails, thereby improving the safety of the device operation; by setting a detachable locking joint 37, the chain 35 can be quickly released when adjusting the length, without interfering with the length adjustment operation of the pull rod 18.

[0035] Working principle: When operating this 125MW dual water-cooled generator rotor sheath gripping device, first install the two-part combined force-bearing clamping sleeve 1 at the root of the sheath 3 to complete the axial limit, and simultaneously assemble the symmetrically arranged force-bearing tie rod assembly 4; then clamp and fix the two-part lifting clamping sleeve 2 to the outer wall of the sheath 3, lock the external thread end 20 of the force-bearing tie rod assembly 4 to the end force plate 5, align the piston end of the hydraulic jack 6 assembled on the inner side of the end force plate 5 with the end face of the rotor shaft head 7, and install the protective assembly 34 in place as a secondary safety protection, thus completing the on-site assembly of the entire device. Subsequently, heating equipment is used to rapidly heat the sheath 3 to the set temperature. The sheath 3 expands due to heat, eliminating some of the interference fit stress. Hydraulic jack 6 is activated, using the rotor shaft head 7 as the reaction fulcrum. Hydraulic jack 6 pushes the end force plate 5 outward, and the force-bearing tie rod assembly 4 transmits the axial tension to the force-bearing clamping sleeve 1. The force-bearing clamping sleeve 1 drives the sheath 3 to move axially, creating a separation gap between the root of the sheath 3 and the nested meshing teeth on the generator rotor 8. After the gap is formed, a circumferential force is applied to the hoisting clamping sleeve 2 by an overhead crane, causing the sheath 3 to complete a small-angle rotation, so that all the nested meshing teeth between the sheath 3 and the generator rotor 8 are completely disengaged. After the teeth are completely disengaged, the overhead crane directly lifts the sheath 3 off the generator rotor 8 as a whole, completing the hot disassembly of the sheath 3.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotor sheath gripping device for a 125MW dual water-cooled generator, characterized in that: Including a force-bearing clamping sleeve (1) and a hoisting clamping sleeve (2); The hoisting clamping sleeve (2) is used to be fitted onto the outer wall of the sheath (3); the force-bearing clamping sleeve (1) is used to be fitted onto the root of the sheath (3) and form an axial limit with the sheath (3); At least two force-bearing tie rod assemblies (4) are symmetrically arranged on the force-bearing clamping sleeve (1). The ends of the force-bearing tie rod assemblies (4) are connected to an end force plate (5). A hydraulic jack (6) is installed on the inner wall of the end force plate (5). The piston end of the hydraulic jack (6) is used to apply external force to the rotor shaft head (7).

2. The 125MW dual water-cooled generator rotor sheath gripping device according to claim 1, characterized in that: The force-bearing clamping sleeve (1) includes two semi-arc first hoops (9), and the two first hoops (9) together form an annular sleeve cavity that is in clearance fit with the outer circumference of the generator rotor (8); The end face of the first hoop (9) abuts against the end face of the sheath (3) to form an axial limit. A semi-arc-shaped limiting plate (10) is fixedly provided on the outer wall of the first hoop (9). The limiting plate (10) protrudes along the axial direction of the first hoop (9) and fits and is positioned in circumferentially against the outer wall of the sheath (3). The mating ends of the two first hoop bodies (9) extend outward to form first lug flanges (11), and the two sets of mating first lug flanges (11) are locked and fixed by two sets of symmetrically arranged first locking bolt assemblies (12).

3. The 125MW dual water-cooled generator rotor sheath gripping device according to claim 2, characterized in that: The limiting plate (10) has first annular lifting lugs (13) fixedly installed at symmetrical positions above and below the ring.

4. The 125MW dual water-cooled generator rotor sheath gripping device according to claim 1, characterized in that: The hoisting clamping sleeve (2) includes two semi-arc second hoops (14), which together form an annular cavity around the outer periphery of the clamping sleeve (3); The mating ends of the two second hoop bodies (14) extend outward to form second lug flanges (15), and the two sets of mating second lug flanges (15) are locked and fixed by two sets of symmetrically arranged second locking bolt assemblies (16).

5. The 125MW dual water-cooled generator rotor sheath gripping device according to claim 4, characterized in that: The second hoop (14) has a second annular lifting lug (17) fixedly installed at the symmetrical positions above and below the ring.

6. The 125MW dual water-cooled generator rotor sheath gripping device according to claim 2, characterized in that: The force-bearing tie rod assembly (4) includes a tie rod body (18), a fork-shaped double-ear connector (19), and an external thread end (20). The tie rod body (18) is a load-bearing long straight rod structure. One end of the tie rod body (18) is fixedly provided with a fork-shaped double-ear joint (19). The fork-shaped double-ear joint (19) is provided with a through bolt hole (21). The bolt of the first locking bolt assembly (12) passes through the bolt hole (21) to achieve hinged assembly. The other end of the tie rod body (18) is machined with an external thread end (20). The external thread end (20) is provided with a locking nut (22). The locking nut (22) is used to lock and fix the tie rod body (18) to the end force plate (5).

7. The 125MW dual water-cooled generator rotor sheath gripping device according to claim 6, characterized in that: The pull rod body (18) has an adjustment connection section (23) at one end near the fork-type double-ear joint (19), and the adjustment connection section (23) adopts a threaded fitting structure.

8. The 125MW dual water-cooled generator rotor sheath gripping device according to claim 6, characterized in that: The pull rod body (18) is provided with an adjustment connection section (23) at one end near the fork-type double ear joint (19). The adjustment connection section (23) adopts a gear plug-in adjustment structure, including a rod joint (24), a main rod body (25), a limit pin (26), and a cotter pin (27). One end of the rod connector (24) is fixedly connected to the fork-shaped double-ear connector (19), and the side wall of the rod connector (24) is provided with a plurality of positioning holes (28) spaced apart; one end of the main rod body (25) is fixedly provided with a hollow cylindrical adjusting sleeve (29), and the rod connector (24) is axially slidably inserted into the adjusting sleeve (29); The adjusting sleeve (29) has a through hole (30) that matches the positioning hole (28) on its wall. The limiting pin (26) radially penetrates the adjusting sleeve (29) wall and the positioning hole (28) on the rod joint (24) to radially insert and position the adjusting sleeve (29) and the rod joint (24). The extended end of the limiting pin (26) has a pin hole (31), and the cotter pin (27) is inserted into the pin hole (31) to achieve limiting and anti-detachment.

9. The 125MW dual water-cooled generator rotor sheath gripping device according to claim 6, characterized in that: The end bearing plate (5) is a rectangular plate structure, and the outer wall of the end bearing plate (5) is provided with a boss bearing key (32) for bearing shear force. The end plate (5) is provided with symmetrical through-holes (33) on both sides of the boss key (32). The through-holes (33) are used to pass through the external thread end (20) of the tie rod body (18) to achieve assembly and fixation.

10. The 125MW dual water-cooled generator rotor sheath gripping device according to claim 7 or 8, characterized in that: The outer side of the pull rod (18) is equipped with a protective component (34), which includes a chain (35), a connecting end (36), and a detachable locking joint (37). One end of the chain (35) is fixedly connected to the pull rod body (18) on the side of the adjusting connecting section (23) away from the fork-shaped double-ear joint (19) via the connecting end (36). The other end of the chain (35) is locked and fixed to the pull rod body (18) via the detachable locking joint (37). The detachable locking joint (37) is a bolt and nut locking structure.

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