System and method for online replacement of external circulation oil pump shaft seal of large hydro-generator set

Abstract

The present invention discloses a system and method for online replacement of the shaft seal of the external circulation oil pump of a large hydro-generator set. The system includes a slide rail assembly and a rotating cross plate. The middle of the rotating cross plate is connected to a thrust bearing, and a four-wheel pulley is connected to the thrust bearing. The rollers of the four-wheel pulley are located in the slide groove of the slide rail assembly. The bottom of the rotating cross plate is connected to two lifting devices. Each lifting device includes a worm gear pair fixedly connected to the rotating cross plate, wherein the worm of the worm gear pair is a trapezoidal screw arranged vertically downward, and the lower part of the trapezoidal screw is threadedly connected to a trapezoidal nut rod. A transmission gear is also connected to the turbine shaft of the worm gear pair. The two lifting devices are connected by a synchronization mechanism. The present invention utilizes the lifting device to complete the lifting or lowering of the equipment. The overall operation is convenient, and the lifting, lowering and transportation of the oil pump motor in a narrow space are completed quickly, safely, time-saving and labor-saving.

Description

Technical Field

[0001] The invention belongs to the technical field of maintenance of hydro-generator sets, and in particular relates to a system and method for online replacement of a shaft seal of an external circulation oil pump of a large hydro-generator set. Background Art

[0002] The derivation oil tank of the mixed flow turbine generator set in large and medium-sized hydropower stations at home and abroad is mainly installed in the frame. The circulating medium of the derivation oil tank is cooled by forced external circulation cooling. The circulating oil pump and oil circuit are arranged inside the frame support arm. The installation space is narrow and there are many pipelines and equipment. This makes the oil pump and equipment inspection and maintenance very inconvenient.

[0003] When a large amount of oil is leaking from the shaft seal of a generator set's external circulation oil pump, the current approach is to temporarily isolate and cut the oil line, shut down the operating unit, and then prepare to replace the motor seal. The main difficulties encountered are: ① Due to the limited installation location of the generator set's external circulation oil pump motor, the top of the motor is only 350mm from the lower frame center cover, insufficient space for general lifting equipment for emergency repairs. Therefore, the unit must be shut down first, the lower frame center cover removed, and lifting points arranged on the rotor support arm for lifting the motor. ② During flood season, when the unit is fully operational, oil spillage from the pump shaft seal can cause an unexpected shutdown, damaging the equipment and resulting in significant economic losses for companies at all levels. ③ Currently, similar issues are primarily addressed by manually lifting the motor with a hand winch, which presents numerous safety hazards. ④ Cross-operation occurs between the upper and lower working surfaces, posing significant challenges to equipment and personnel safety. ⑤ The confined space and the numerous equipment make large lifting equipment inaccessible, resulting in low work efficiency and other challenges that need to be addressed urgently. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the existing technology and propose a system and method for online replacement of the shaft seal of the derivation external circulation oil pump of a large hydro-turbine generator set. Through the present invention, the shaft seal replacement of the derivation external circulation oil pump can be completed without shutting down the unit, and the normal operation of the derivation oil tank can be ensured, thereby protecting the safety of the unit equipment.

[0005] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

[0006] Preferably, the synchronization mechanism includes a transmission shaft rotatably connected to the rotating horizontal plate through a bearing, the transmission shaft is located between the two lifting devices, and both ends of the transmission shaft are respectively connected to the gear shafts of the two driven gears through universal joints.

[0007] Preferably, the connecting component includes a lifting screw connected to the lower end of the trapezoidal nut rod, and also includes a lifting adjustment ear threadedly connected to the lifting screw, and an adjusting nut is also connected to the lifting screw.

[0008] Preferably, the slide rail assembly includes a double top beam and a double slide rail connected to the double top beam, the rotating cross plate is connected to the double slide rail, a slide plate is welded at one end of the double top beam, a slider adapted to the slide plate is welded at one end of the double slide rail, a cross plate is welded at the other end of the double slide rail, and also includes a splint fixing device mounted on both ends of the cross plate, the splint fixing device includes two oppositely arranged splints, and the two ends of the two splints are respectively connected by bolts.

[0009] Preferably, it also includes a laser locator, which is installed in the center hole of the four-wheel pulley in the middle of the rotating cross plate, and the laser locator uses a button battery to provide power supply.

[0010] Preferably, it also includes an anti-fall device, which includes a steel wire rope, two sets of anti-fall devices and two clamping rings. The steel wire rope passes through the top of the slide rail assembly, and a set of anti-fall devices is hung on each end of the steel wire rope. The other end of the anti-fall device is connected to the clamping ring.

[0011] Preferably, it also includes an electric operating mechanism, which includes an electric wrench and an inner hexagonal wrench connected to the electric wrench, and an inner hexagonal hole adapted to the inner hexagonal wrench is provided on the turbine shaft of the worm gear pair. The electric operating mechanism provides power to the worm gear pair to make the two sets of worm gear pairs rotate synchronously.

[0012] Preferably, the double top beam includes two cross beams, the two cross beams are separated from each other, and a stepped opening is constructed at the lower part of both ends of each cross beam, and the stepped opening is used to be inserted into the support of the lower part of the cover plate in the lower frame.

[0013] Another aspect of the present invention provides a method for online replacement of a shaft seal of an external circulation oil pump of a large hydro-generator set, using the above-mentioned system for online replacement of a shaft seal of an external circulation oil pump of a large hydro-generator set, specifically comprising the following steps:

[0014] S1 places the double top beams on the cover beam in the lower frame;

[0015] S2 hangs the double slide rails on the lower part of the double top beams, so that one end of the double slide rails is connected to the clamping plate fixing device through the horizontal plate, and the other end is slidably connected to the slide plate through the slider, so that the double slide rails are firmly fixed;

[0016] S3 inserts the rollers of the four-wheel pulley into the double slide rails and installs anti-slip rods at both ends of the double slide rails;

[0017] S4 activates the laser positioning device so that the laser point is basically aligned with the center point of the oil pump motor, achieving a basically vertical lifting state;

[0018] S5 Connect the lifting adjustment ear to the oil pump motor, insert the lifting screw of the lifting device into the lifting adjustment ear, and secure it with the adjusting nut;

[0019] S6 passes the anti-fall device through the top of the double top beam and fixes the two sets of anti-fall devices on the other two lifting ears of the oil pump motor to ensure that the oil pump motor does not fall suddenly;

[0020] S7 mates the electric operating mechanism with the hexagonal socket of one set of worm gear pairs to complete the preparation work;

[0021] S8 starts the electric operating mechanism in one motion, which drives the synchronous mechanism and the lifting device to slowly raise the oil pump motor;

[0022] S9: When the upper section of the coupling at the bottom of the oil pump motor exceeds the top of the oil pump motor seat, the electric operating mechanism is stopped. During this process, the anti-fall device is in a retracted state until it is lifted into place.

[0023] S10 separates the electric operating mechanism from the worm gear pair to prevent malfunction of the equipment;

[0024] S11 slides the oil pump motor together with the rotating cross plate outward along the double slide rails until it moves out of the oil pump shaft seal replacement station space, stops, and locks it to prevent the motor from sliding;

[0025] S12 Replace the oil pump shaft seal. After the shaft seal is replaced, release the lock of the oil pump motor and the rotating horizontal plate, and slowly slide the motor back to the top of the oil pump;

[0026] S13 reconnects the electric operating mechanism to the worm gear pair, and slowly activates the electric operating mechanism to drive the synchronization mechanism, which in turn drives the lifting device to slowly lower the oil pump motor until the upper part of the coupling at the bottom of the oil pump motor and the coupling part of the oil pump drive shaft are inserted into place;

[0027] S14 fixed the oil pump motor base bolts, and removed the components of the system for online replacement of the external circulation oil pump shaft seal of the large hydro-generator set in reverse order of S7-S1. All the work was completed.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The system and method provided by the present invention for online replacement of the shaft seal of the external circulation oil pump of a large hydro-turbine generator set utilize a lifting device to complete the lifting or lowering of the equipment. The overall operation is convenient, which greatly reduces the labor intensity of the staff, liberates the labor force, improves the personal safety of the equipment and personnel, effectively avoids cross-operation, and realizes the lifting, lowering and transportation of the oil pump motor in a narrow space in a fast, safe, time-saving and labor-saving manner without affecting the normal operation of the hydro-turbine generator set, and can avoid the huge economic losses caused by replacing the shaft seal of the external circulation oil pump after the overall disassembly of the generator set.

[0030] During operation, the lifting and lowering states of the oil pump motor are realized by changing the forward and reverse rotation of the electric operating mechanism, so that it can replace the external circulation oil pump shaft seal online without stopping the machine, and realize the lifting, lowering and moving of the equipment in a small space, so as to smoothly carry out the equipment repair work and ensure the safety of equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the main structure of the system for deriving the shaft seal of the external circulation oil pump for online replacement of a large hydro-generator set according to the present invention.

[0032] Figure 2 The present invention is a schematic diagram of the three-dimensional structure of a system for deriving an external circulation oil pump shaft seal for online replacement of a large hydro-generator set.

[0033] Figure 3 The present invention is a schematic diagram of the three-dimensional structure of the system for online replacement of the external circulation oil pump shaft seal of a large hydro-generator set, omitting the slide rail assembly.

[0034] Figure 4 Another schematic diagram of the three-dimensional structure of the system for online replacement of the external circulation oil pump shaft seal of a large hydro-generator set according to the present invention is shown after omitting the slide rail assembly.

[0035] Figure 5 The present invention is a schematic top view of the structure of the system for online replacement of the external circulation oil pump shaft seal of a large hydro-generator set, omitting the slide rail assembly.

[0036] Figure 6 The figure is a partial structural diagram of the double slide rails of the system for deriving the shaft seal of the external circulation oil pump for online replacement of a large hydro-generator set according to the present invention.

[0037] Figure 7 It is a schematic diagram of the use state of the present invention.

[0038] In the above drawings: 1. Generator rotor; 2. Generator shaft; 3. Push bearing oil tank; 4. Lower frame; 5. Derived external circulation oil pump; a. Oil pump motor; 6. Lower frame middle cover; 10. Slide rail assembly; 11. Double top beam; 12. Double slide rail; 13. Slide plate; 14. Slider; 15. Cross plate; 16. Clamp fixing device; 17. Clamp; 18. Clamp bolt; 19. Step opening; 20. Rotating cross plate; 21. Thrust bearing; 22. Four-wheel pulley; 23. Fixed plate; 24. Roller; 30. Lifting device; 31. Worm gear pair; 32. Trapezoidal screw; 33. Trapezoidal nut rod; 34. Turbine shaft; 35. Transmission gear; 36. Driven gear; 40. Synchronizing mechanism; 41. Transmission shaft; 42. Universal joint; 50. Connecting part; 51. Lifting screw; 52. Lifting adjustment ear; 53. Adjusting nut; 60. Laser locator; 70. Anti-fall device; 71. Wire rope; 72. Anti-fall device; 73. Snap ring. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] It should be noted that in the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined; in addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] Unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or removable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0042] like Figure 7 As shown, the generator rotor 1 and the generator shaft 2 of the hydro-generator set are connected as one by bolts. The generator shaft 2 passes through the derivation bearing oil groove 3 along the axis. The derivation bearing oil groove 3 is welded to the upper part of the lower frame 4. The lower frame 4 is distributed in a circle and is welded by 12 support blocks and 1 central body. A lower frame middle cover 7 is installed on the top of each support block. Among them, 6 groups of derivation external circulation oil pumps 5 are evenly distributed inside the 12 support blocks. Each group of derivation external circulation oil pumps 5 is driven by a set of oil pump motor a. However, the vertical distance from the oil pump motor a to the lower frame middle cover 7 is less than 350 mm. Therefore, the replacement of the external circulation oil pump shaft seal requires shutdown or even disassembly of the machine.

[0043] See Figures 1-6As a preferred embodiment of the present invention, this embodiment provides a system for online replacement of the shaft seal of the external circulation oil pump of a large hydro-generator set, including a slide rail assembly 10 and a rotating cross plate 20 slidably connected to the slide rail assembly 10, a thrust bearing 21 is connected to the middle of the rotating cross plate 20, and a four-wheel pulley 22 is connected to the inner ring of the thrust bearing 21. The four-wheel pulley 22 includes two fixed plates 23 fixedly connected to the thrust bearing 21 and two sets of rollers 24 rotatably connected to the fixed plates 23. The rollers 24 of the four-wheel pulley 22 are located in the slide groove of the slide rail assembly 10 to realize the free sliding of the rotating cross plate 20 inside the slide rail assembly 10. Two lifting devices 30 are connected at the bottom, and each of the lifting devices 30 includes a worm gear pair 31 fixedly connected to the rotating cross plate 20, wherein the worm of the worm gear pair 31 is a trapezoidal screw 32 arranged vertically downward to achieve the purpose of self-locking and anti-falling. The lower part of the trapezoidal screw 32 is threadedly connected to the trapezoidal nut rod 33, and a connecting component 50 is provided on the trapezoidal nut rod 33. A transmission gear 35 is also connected to the turbine shaft 34 of the worm gear pair 31, and the transmission gear 35 is engaged with the driven gear 36. The two driven gears 36 of the two lifting devices 30 are connected by a synchronization mechanism 40 to enable the two worm gear pairs 31 in the two lifting devices 30 to rotate synchronously.

[0044] In some embodiments, the synchronization mechanism 40 includes a transmission shaft 41 rotatably connected to the rotating horizontal plate 20 through a bearing. The transmission shaft 41 is located between the two lifting devices 20, and both ends of the transmission shaft 41 are respectively connected to the gear shafts of the two driven gears 36 through universal joints 42.

[0045] In some preferred embodiments, the connecting component 50 includes a lifting screw 51 connected to the lower end of the trapezoidal nut rod 33, and also includes a lifting adjustment ear 52 threadedly connected to the lifting screw 51. The lifting adjustment ear 52 is an "L"-shaped design with a through hole on each side. An adjusting nut 53 is also connected to the through hole on the lifting screw 51. The adjusting nut is a high-strength nut, which is used in conjunction with the adjusting lifting screw 51 to perform a fixing and locking function.

[0046] In some preferred embodiments, the slide rail assembly 10 includes a double top beam 11 and a double slide rail 12 connected to the double top beam 11, the rotating cross plate 20 is connected to the double slide rail 12, a slide plate 13 is welded to one end of the double top beam 11, a slider 14 adapted to the slide plate 13 is welded to one end of the double slide rail 12, a cross plate 15 is welded to the other end of the double slide rail 12, and also includes a splint fixing device 16 mounted on both ends of the cross plate 15, the splint fixing device 16 includes two oppositely arranged splints 17, and the two ends of the two splints 17 are respectively connected by splint bolts 18.

[0047] In other preferred embodiments, a laser locator 60 is further included. The laser locator 60 is installed in the center hole of the four-wheel pulley 22 in the middle of the rotating horizontal plate 20. The laser locator 60 uses a button battery to provide power supply. The laser locator 60 can emit laser and adjust the size of the laser spot to locate whether the center of the entire system is consistent with the center of the upper end cover of the motor, and make the centers concentric as much as possible, thereby improving the installation accuracy of the present invention and the reinstallation accuracy of the oil pump motor 6 when it is reinstalled.

[0048] In other preferred embodiments, taking into account the limited space and special circumstances that may arise during operation, in order to avoid the safety hazard of falling during operation, this embodiment also includes an anti-fall device 70, which includes a steel wire rope 71, two sets of anti-fall devices 72 and two clamping rings 73. The steel wire rope 71 passes through the top of the slide rail assembly 10, and a set of anti-fall devices 72 are hung at each end of the steel wire rope 71. The other end of the anti-fall device 72 is connected to the clamping ring 73.

[0049] In some embodiments, an electric operating mechanism is also included, which includes an electric wrench and an inner hexagonal wrench connected to the electric wrench. The turbine shaft 34 of the worm gear pair 31 is provided with an inner hexagonal hole adapted to the inner hexagonal wrench. The electric operating mechanism is used to provide power to the worm gear pair 31 so that the two sets of worm gear pairs 31 rotate synchronously. In this embodiment, the electric wrench and the inner hexagonal wrench connected to the electric wrench are both commonly used tools for equipment maintenance. People in this field are aware of their specific structure and function. This part of the structure is not described in detail in this embodiment. People in this field should be aware of the specific component composition and usage method of the electric operating mechanism in combination with the inventive concept and purpose of this application.

[0050] In some preferred embodiments, the double top beam 11 includes two cross beams, which are separated from each other. A stepped opening 19 is constructed at the lower part of both ends of each cross beam, and the stepped opening 19 is used to be inserted into the support at the lower part of the cover plate in the lower frame.

[0051] As another preferred embodiment of the present invention, this embodiment provides a method for online replacement of a shaft seal of an external circulation oil pump of a large hydro-generator set, using the above-mentioned system for online replacement of a shaft seal of an external circulation oil pump of a large hydro-generator set, specifically comprising the following steps:

[0052] S1 places the double top beams on the cover beam in the lower frame;

[0053] S2 hangs the double slide rails on the lower part of the double top beams, so that one end of the double slide rails is connected to the clamping plate fixing device through the horizontal plate, and the other end is slidably connected to the slide plate through the slider, so that the double slide rails are firmly fixed;

[0054] S3 inserts the rollers of the four-wheel pulley into the double slide rails and installs anti-slip rods at both ends of the double slide rails;

[0055] S4 activates the laser positioning device so that the laser point is basically aligned with the center point of the oil pump motor, achieving a basically vertical lifting state;

[0056] S5 Connect the lifting adjustment ear to the oil pump motor, insert the lifting screw of the lifting device into the lifting adjustment ear, and secure it with the adjusting nut;

[0057] S6 passes the anti-fall device through the top of the double top beam and fixes the two sets of anti-fall devices on the other two lifting ears of the oil pump motor to ensure that the oil pump motor does not fall suddenly;

[0058] S7 mates the electric operating mechanism with the hexagonal socket of one set of worm gear pairs to complete the preparation work;

[0059] S8 starts the electric operating mechanism in one motion, which drives the synchronous mechanism and the lifting device to slowly raise the oil pump motor;

[0060] S9: When the upper section of the coupling at the bottom of the oil pump motor exceeds the top of the oil pump motor seat, the electric operating mechanism is stopped. During this process, the anti-fall device is in a retracted state until it is lifted into place.

[0061] S10 separates the electric operating mechanism from the worm gear pair to prevent malfunction of the equipment;

[0062] S11 slides the oil pump motor together with the rotating cross plate outward along the double slide rails until it moves out of the oil pump shaft seal replacement station space, stops, and locks it to prevent the motor from sliding;

[0063] S12 Replace the oil pump shaft seal. After the shaft seal is replaced, release the lock of the oil pump motor and the rotating horizontal plate, and slowly slide the motor back to the top of the oil pump;

[0064] S13 reconnects the electric operating mechanism to the worm gear pair, and slowly activates the electric operating mechanism to drive the synchronization mechanism, which in turn drives the lifting device to slowly lower the oil pump motor until the upper part of the coupling at the bottom of the oil pump motor and the coupling part of the oil pump drive shaft are inserted into place;

[0065] S14 fixed the oil pump motor base bolts, and removed the components of the system for online replacement of the external circulation oil pump shaft seal of the large hydro-generator set in reverse order of S7-S1. All the work was completed.

[0066] Through the above process, by changing the forward and reverse rotation of the electric operating mechanism, the lifting and lowering states of the oil pump motor can be realized, so that it can replace the external circulation oil pump shaft seal online without stopping the machine, and realize the lifting, lowering and moving of the equipment in a small space, so as to realize the smooth implementation of the equipment repair work and ensure the safety of equipment and personnel.

[0067] Through the implementation of this patent, the number of people involved in this work will be reduced from the original 7-8 people to 2-3 people, and the working hours will be shortened from the original 8 hours to less than 3 hours. In addition, there is no need for the unit to be shut down, repaired, and started up and connected to the grid, which avoids waste of unit time and water flow.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A system for online replacement of the shaft seal of the external circulation oil pump of a large hydro-generator set, characterized by: Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion. The connecting component includes a lifting screw connected to the lower end of the trapezoidal nut rod, and also includes a lifting adjustment ear threadedly connected to the lifting screw, and an adjusting nut is further connected to the lifting screw; The slide rail assembly includes a double top beam and a double slide rail connected to the double top beam, the rotating cross plate is connected to the double slide rail, a slide plate is welded to one end of the double top beam, a slider adapted to the slide plate is welded to one end of the double slide rail, a cross plate is welded to the other end of the double slide rail, and further includes a clamping plate fixing device sleeved on both ends of the cross plate, the clamping plate fixing device includes two clamping plates arranged opposite to each other, and the two ends of the two clamping plates are respectively connected by bolts; It also includes a laser locator, which is installed in the center hole of the four-wheel pulley in the middle of the rotating horizontal plate, and the laser locator uses a button battery to provide power supply; It also includes an anti-fall device and an electric operating mechanism, the electric operating mechanism includes an electric wrench and an inner hexagonal wrench connected to the electric wrench, the worm shaft of the worm gear pair is provided with an inner hexagonal hole adapted to the inner hexagonal wrench, the electric operating mechanism provides power to the worm gear pair, so that the two groups of worm gear pairs rotate synchronously.

2. The system for online replacement of shaft seal of external circulation oil pump of large hydro-generator set according to claim 1, characterized in that; The synchronization mechanism includes a transmission shaft rotatably connected to the rotating transverse plate through a bearing, the transmission shaft is located between the two lifting devices, and both ends of the transmission shaft are respectively connected to the gear shafts of the two driven gears through universal joints.

3. The system for online replacement of shaft seal of external circulation oil pump of large hydro-generator set according to claim 1 is characterized in that: The anti-fall device includes a steel wire rope, two sets of anti-fall devices and two clamping rings. The steel wire rope passes through the top of the slide rail assembly. A set of anti-fall devices is hung on each end of the steel wire rope, and the other end of the anti-fall device is connected to the clamping ring.

4. The system for online replacement of shaft seal of external circulation oil pump of large hydro-generator set according to claim 1 is characterized in that: The double top beam includes two cross beams, which are separated from each other. A stepped opening is constructed at the lower part of both ends of each cross beam, and the stepped opening is used to be inserted into the support at the lower part of the cover plate in the lower frame.

5. A method for online replacement of the shaft seal of an external circulation oil pump of a large hydro-generator set, characterized in that: The system for online replacement of the shaft seal of the external circulation oil pump of a large hydro-generator set according to any one of claims 1 to 4 specifically comprises the following steps: S1 places the double top beams on the cover beam in the lower frame; S2 hangs the double slide rails on the lower part of the double top beams, so that one end of the double slide rails is connected to the clamping plate fixing device through the horizontal plate, and the other end is slidably connected to the slide plate through the slider, so that the double slide rails are firmly fixed; S3 inserts the rollers of the four-wheel pulley into the double slide rails and installs anti-slip rods at both ends of the double slide rails; S4 turns on the laser positioning device so that the laser point is basically aligned with the center point of the oil pump motor, achieving a basically vertical lifting state; S5 Connect the lifting adjustment ear to the oil pump motor, insert the lifting screw of the lifting device into the lifting adjustment ear, and secure it with the adjusting nut; S6 passes the anti-fall device through the top of the double top beam and fixes the two sets of anti-fall devices on the other two lifting ears of the oil pump motor to ensure that the oil pump motor does not fall suddenly; S7 mates the electric operating mechanism with the hexagonal socket of one set of worm gear pairs to complete the preparation work; S8 starts the electric operating mechanism in one motion, which drives the synchronous mechanism and the lifting device to slowly raise the oil pump motor; S9: When the upper section of the coupling at the bottom of the oil pump motor exceeds the top of the oil pump motor seat, the electric operating mechanism is stopped. During this process, the anti-fall device is in a retracted state until it is lifted into place. S10 separates the electric operating mechanism from the worm gear pair to prevent malfunction of the equipment; S11 slides the oil pump motor together with the rotating cross plate outward along the double slide rails until it moves out of the oil pump shaft seal replacement station space, stops, and locks it to prevent the motor from sliding; S12 Replace the oil pump shaft seal. After the shaft seal is replaced, release the lock of the oil pump motor and the rotating horizontal plate, and slowly slide the motor back to the top of the oil pump; S13 reconnects the electric operating mechanism to the worm gear pair, and slowly activates the electric operating mechanism to drive the synchronization mechanism, which in turn drives the lifting device to slowly lower the oil pump motor until the upper part of the coupling at the bottom of the oil pump motor and the coupling part of the oil pump drive shaft are inserted into place; S14 fixed the oil pump motor base bolts, and removed the components of the system for online replacement of the external circulation oil pump shaft seal of the large hydro-generator set in reverse order of S7-S1. All the work was completed.

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