Method for transforming and installing a servomotor of a hydroelectric generator set

Abstract

A method for transforming and installing a water turbine generator set servomotor, comprising the following steps: S1: old servomotor on-site data measurement and disassembly, wherein a selected measurement reference point is lined in a concrete steel plate on one side of the servomotor; S2: re-drilling and tapping of bolt holes on the installation base plate of the servomotor; S3: crosshead installation on the new servomotor; S4: installation of the servomotor on the installation base plate and adjustment of the inclination of the servomotor through adjustment of the pad; S5: adjustment of the pressing stroke of the servomotor; S6: installation of servomotor piping; and S7: installation of servomotor accessories. The above method can realize transformation and installation of a water turbine generator set servomotor when the original installation reference of the servomotor cannot be determined.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator technology, and in particular to a method for modifying and installing a hydro-generator set relay. Background Technology

[0002] The servo motor of a hydro-generator unit is one of its key components. Its function is to drive the control ring of the generator unit to rotate, thereby opening, closing, and adjusting the angle of the guide vanes. During operation, a certain unit repeatedly experienced sluggish guide vane opening and closing. Assessment revealed that this sluggishness was caused by insufficient operating torque of the servo motor. Therefore, it is planned to replace the servo motor with one that has a greater push-pull force.

[0003] For the replacement and modification project of the relay, since the original installation benchmark of the relay cannot be determined, the selection of the benchmark point for adjusting the installation position of the new relay, as well as the measurement and adjustment of the horizontal, elevation, left and right position and tilt of the new relay, became the difficulties of the project. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the problems existing in the background art and provide a method for retrofitting and installing a hydro-generator set servo. The method involves selecting reference points for adjusting the center, elevation, and torsional tilt of the servo on the concrete steel plate lining on one side of the servo, and adjusting the tilt of the servo by adjusting the shims, thereby ensuring the accuracy of the retrofitting and installation and realizing the replacement of the servo.

[0005] To achieve the above-mentioned technical features, the objective of this invention is as follows: A method for retrofitting and installing a hydro-generator set, comprising the following steps: S1: On-site data measurement and disassembly of the old relay device, including selecting reference points for measurement on the concrete steel plate lining on one side of the relay device; S2: Re-drill and tap the bolt holes on the mounting base plate of the relay; S3: New crosshead installation on the relay; S4: Install the relay onto the mounting base plate and adjust the tilt of the relay by adjusting the shims; S5: Adjustment of the clamping stroke of the relay; S6: Relay equipment piping installation; S7: Relay device accessory installation.

[0006] S1 includes the following steps: S10. Adjust the guide vane to 50% opening, depressurize and drain the oil from the relay, remove the double connecting plate, and disconnect the oil pipe of the relay's switch chamber. S11. Use a hand chain hoist or jack to adjust the push-pull rod of the relay to the 50% stroke position of the relay, and record the extension length of the push-pull rod; S12. Use a jack or copper rod to adjust the crosshead of the relay to be horizontal in the X direction by no more than 0.02 mm / m; S13. Use a level to measure the horizontal position of the crosshead in the Y direction by placing the leveling instrument on the upper surface of the crosshead, and use a level to measure the elevation difference between the control lug handle, the crosshead and the reference point. S14. On a reference point at the same height as the push-pull rod on one side of the relay, select interval measuring points a and b, and use an inside micrometer to measure the distances La and Lb from the measuring points to the push-pull rod.

[0007] S2 includes the following steps: S20. After the old relay is lifted out of the pit, the new relay mounting holes are marked on the mounting base plate, using the old relay mounting hole positions as a reference. S21. Drill and tap the marked holes.

[0008] S3 includes the following steps: S30. Removal of the crosshead of the old relay; S31. Measure the thicknesses d1 and d2 of the clamping stroke adjustment shims of the two old relays; S32. Machining two temporary adjustment shims for the clamping stroke: the thickness of the temporary adjustment shim for relay #1 is A=d1-15mm, and the thickness of the temporary adjustment shim for relay #2 is B=d2+15mm; wherein, the temporary adjustment shims are two semi-circular rings; S33. Install the crosshead and temporary adjusting washer ring onto the new relay, and tighten the four super nut push bolts symmetrically.

[0009] S4 includes the following steps: S40. After the top cover is reinstalled and the top cover positioning pin is installed, and after at least one side of the bolt holes on the mounting base plate for installing the relay is machined, the installation of the new relay shall begin. S41. Check that the new bolt holes on the mounting base plate are qualified, clean and check that the adjusting shim plate is free of high points and burrs, and install the adjusting shim plate onto the mounting base plate through the countersunk bolts. S42. Hoist the new relay into the installation position; S43. When the rear end cover of the new relay is 5-20mm away from the adjusting pad, adjust the relay so that the bolt holes of the rear end cover of the relay are aligned with the bolt holes of the mounting base plate, and insert all connecting bolts. S44. Use four symmetrical connecting bolts to close the joint of the rear end cover of the relay and tighten the bolts; S45. Use a jack, chain hoist, or hydraulic system to push the new relay lever out 50% of its stroke; S46. Loosen the jacking bolt of the super nut, use a jack or copper rod to adjust the crosshead of the relay to be absolutely horizontal in the X direction by no more than 0.02mm / m, tighten the jacking bolt symmetrically, use a level to measure the horizontality of the crosshead in the Y direction by placing a level on the upper surface of the crosshead, and use a level to measure the elevation difference between the control ring handle, the crosshead and the reference point. S47. Adjust the level, elevation, lateral position, and tilt of the relay to meet technical requirements. Monitor the adjustment process using a dial indicator on the rear cover frame. Adjust the left and right positions of the relay using the La and Lb data in S14; The relay race was leveled using a level measuring instrument, including both the X and Y directions. The elevation difference between the control ring handle, crosshead, and benchmark point is measured and adjusted using a level instrument. When the screw hole of the rear end cap of the relay interferes with the connecting bolt, the screw hole of the rear end cap needs to be enlarged. When the relay is horizontal or tilted to the left or right and cannot meet the above requirements, it can be adjusted by adding a shim between the rear end cover of the relay and the adjusting shim plate. When the amount of shim added is no more than 0.2mm, the shim plate is adjusted by grinding to meet the requirements; When the amount of padding is greater than 0.2mm, measure the distance from the rear end cover of the relay to the base plate, and calculate the thickness of the new adjustment pad in each direction based on this distance. Process the new pad according to the thickness, mark the slope direction, pull out the new relay, remove the previously installed adjustment pad, install the new adjustment pad, and repeat the above steps until the adjustment is qualified. S48. After the relay is adjusted to be qualified, install all the connecting bolts connecting the relay to the mounting base plate; S49. Stretch all connecting bolts to the specified tension value and record it. Check the elevation, level and center of the relay. After the check is qualified, drill and ream positioning pin holes on the rear end cover, adjusting pad and mounting base plate of the relay and drive in the positioning pins. The relays on both sides can be installed at the same time or on separate sides.

[0010] In S5, the following steps are included: S50. The clamping stroke of the relay is adjusted when the top cover, control ring and water guiding mechanism are connected; S51. When the double connecting plates are not connected, the relay is fully closed. Use a jack or copper rod to adjust the crosshead of the relay to be horizontal in the X direction by no more than 0.02mm / m. Tighten the push bolt of the super nut according to the standard torque. Use an inside micrometer to measure the distance C and D from the end face of relay #1 and #2 to the measuring point of the crosshead. S52. Connect the double plates, use hydraulic pressure to drive the guide vanes to a certain opening degree, and ensure that the gap between each guide vane is uniform and qualified. Then use hydraulic pressure to drive the guide vanes to close completely, and measure and adjust the gap between the guide vanes vertical surfaces to be qualified. S53. Install dial indicators on relays #1 and #2 to monitor the displacement of the push-pull rods. Apply hydraulic pressure of no more than 0.5 MPa and push the guide vane to the fully closed position. The dial indicator will stop moving. Then remove the hydraulic pressure. The dial indicator will stop moving. Zero the dial indicator. S54. Gradually increase the pressure to the guide vane clamping oil pressure and maintain the pressure. After the dial indicator stabilizes, take the reading and record it. S55. After the dial indicator stabilizes, use an inside micrometer to measure the distances C1 and D1 from the end face of relays #1 and #2 to the crosshead measuring point, respectively; S56. Calculate the thicknesses A1 and A2 of the clamping stroke adjusting shims on both sides; Among them, relay 1 A1=A+(C-C1), relay 2 B1=B-(D-D1); S57. Process the adjusting shim ring according to the calculated thickness, and accurately measure the actual thickness with an outside micrometer after processing; S58. Replace the adjusting washer ring; reverse the oil pipe of the relay pressurization device, use hydraulic pressure to drive the guide vane to move in the opening direction, and move the push rod 5-10cm; loosen the super nut and turn it outward a certain distance; use hydraulic pressure to drive the push rod to move upstream, remove the temporary adjusting washer ring, replace the adjusting washer ring, use the push bolt or hydraulic pressure to make the adjusting washer ring and the push rod stick together, and tighten the push bolt of the super nut to 75% of the rated torque; S59. Verify the clamping stroke and synchronization; the standard for the qualified adjustment of the relay clamping stroke is that, under the action of clamping oil pressure, the pistons of both relays simultaneously press against the end cover; gradually increase the pressure to the guide vane clamping oil pressure according to the operation in S53 and S54. When the pistons of the two relays do not simultaneously press against the end cover under the guide vane clamping oil pressure, it is necessary to make a fine adjustment to the adjusting shim ring according to the dial indicator reading, and then repeat S57-S59; after the clamping stroke is qualified, tighten the push bolt of the super nut to the rated torque.

[0011] In S6, the following steps are included: S60. After the position of the servo motor is adjusted, begin the piping work for the opening and closing chamber oil pipes of the servo motor; after the opening and closing chamber oil pipes of the servo motor are connected, conduct a pressure test on the opening and closing chamber oil pipes of the servo motor to ensure that there is no leakage, no deformation and no abnormal noise. S61. Once the drain valve is installed, the drain pipe of the relay can be connected. S62. Once the relay position is adjusted and the automatic locking device is installed, perform the coupling of the locking relay oil pipe.

[0012] In S7, the following steps are included: S70. If the old switch chamber and three-section throttle can be installed on the new relay, then use the old throttle; otherwise, process the new throttle according to the orifice diameter of the old throttle and install it. S71. Install the oil pipe in the relay switch chamber; S72. Install a mechanical displacement indicator device for the relay according to the actual position of the relay and the extension direction of the push-pull rod; S73. Install the segmented closing bracket according to the actual position of the relay, the extension direction and height of the push-pull rod, and the segmented closing inflection point; S74. Install segmented shut-off and locking tubing; S75. If the locking device has been assembled and tested in the factory and the assembly is confirmed to be qualified, the locking device does not need to be adapted on site; otherwise, when the No. 1 servo is fully closed and the No. 2 servo is fully open, the locking pin, locking pin pad, locking bracket and locking position sensor for automatic locking and manual locking should be installed and adjusted respectively.

[0013] The present invention has the following beneficial effects: This invention selects reference points for adjusting the center, elevation, and torsional angle of the servo generator on the concrete steel plate lining on one side of the servo generator. It adjusts the tilt of the servo generator by adjusting the shims and the clamping stroke of the shims by adapting the adjusting rings. This ensures the accuracy of the retrofit installation and enables the retrofit installation of the servo generator when the original installation reference of the servo generator cannot be determined. Attached Figure Description

[0014] Figure 1 This is a top view schematic diagram of the hydro-generator relay structure.

[0015] Figure 2 This is a schematic diagram of the main structure of the adjusting pad of the present invention.

[0016] Figure 3 This is a top view schematic diagram of the adjusting pad structure of the present invention.

[0017] Figure 4 This is a schematic diagram for adjusting the clamping stroke of the relay.

[0018] Figure 5 A schematic diagram of installing a dial indicator on a relay.

[0019] In the diagram: 1. Top cover; 2. Guide vane; 3. Control ring; 31. Control ring lug; 4. Relay device; 41. Push-pull rod; 42. Crosshead; 43. Double connecting plate; 5. Super nut; 6. Concrete steel plate lining; 61. Reference point; 7. Mounting base plate; 8. Adjusting shim; 81. Countersunk hole; 9. Adjusting shim ring; 10. Dial indicator. Detailed Implementation

[0020] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0021] See Figure 1-5 A method for modifying and installing a hydro-generator set relay includes the following steps: S1: On-site data measurement and disassembly of the old relay device 4, wherein a reference point 61 for measurement is selected on the concrete steel plate lining 6 on one side of the relay device 4; S2: The bolt holes on the mounting base plate 7 of the relay 4 are re-drilled and tapped; S3: New relay 4 crosshead 42 installation; S4: Install the relay 4 onto the mounting base plate 7, and adjust the tilt of the relay 4 by adjusting the pad 8; S5: Adjustment of the clamping stroke of relay 4; S6: Relay unit 4 piping installation; S7: Relay 4 accessory installation.

[0022] Using the above method, it is possible to modify and install the turbine generator set relay when the original installation benchmark of the relay cannot be determined.

[0023] S1 includes the following steps: S10. Adjust the guide vane to 50% opening, release the pressure and drain the oil from the relay 4, remove the double connecting plate 43, and disconnect the oil pipe of the switch chamber of the relay 4. S11. Use a hand hoist or jack to adjust the push-pull rod 41 of the relay 4 to the 50% stroke position of the relay, and record the extension length of the push-pull rod 41; S12. Use a jack or copper rod to adjust the crosshead 42 of the relay to be absolutely horizontal in the X direction; S13. Use a level to measure the horizontal position of the crosshead 42 in the Y direction, and use a level to measure the elevation difference between the control ring handle 31, the crosshead 42 and the reference point 61. S14. On the reference point 61 at the same height as the push-pull rod 41 on one side of the relay, select interval measuring points a and b, and use an inside micrometer to measure the distances La and Lb from the measuring points to the push-pull rod 41.

[0024] Through the above steps, the on-site location data of the old relay device 4 was measured.

[0025] S2 includes the following steps: S20. After the old relay is lifted out of the pit, the new relay mounting holes are marked on the mounting base plate 7, using the old relay mounting hole positions as a reference. S21. Drill and tap the marked holes.

[0026] Because the new relay cylinder has a larger diameter (the stroke and piston diameter remain unchanged), its mounting hole positions differ from those on the mounting base plate 7. Therefore, the mounting holes need to be machined. Using the mounting holes of the old relay as a basis, new mounting holes are drilled and tapped.

[0027] S3 includes the following steps: S30. Disassembly of the old relay head 42; S31. Measure the thicknesses d1 and d2 of the two old relay clamping stroke adjustment pads 9; S32. Machining two temporary adjustment shims for the clamping stroke: the thickness of the temporary adjustment shim for relay #1 is A=d1-15mm, and the thickness of the temporary adjustment shim for relay #2 is B=d2+15mm; wherein, the temporary adjustment shims are two semi-circular rings; S33. Install the crosshead 42 and temporary adjusting washer ring onto the new relay, and tighten the four push bolts of the super nut 5 symmetrically; By installing a temporary adjusting shim, the piston inside the relay 4 can be tightly attached to one end cap, which facilitates the measurement of the distance from the end face of the relay to the crosshead measuring point in subsequent steps, thereby obtaining accurate thickness data of the permanent adjusting shim.

[0028] S4 includes the following steps: S40. After the top cover 1 is reinstalled and the top cover positioning pin is installed, and after at least one side of the bolt hole on the mounting base plate 7 for mounting the relay 4 is machined, the new relay installation work begins. S41. Check that the new bolt holes on the mounting base plate 7 are qualified, clean and check that the adjusting shim plate 8 is free of high points and burrs, and install the adjusting shim plate 8 onto the mounting base plate 7 through the countersunk hole 81 bolt. S42. Hoist the new relay 4 into the installation position; S43. When the rear end cover of the new relay 4 is 5-20mm away from the adjusting pad, adjust the relay so that the bolt holes of the rear end cover of the relay are aligned with the bolt holes of the mounting base plate 7, and insert all connecting bolts. S44. Use four symmetrical connecting bolts to close the joint of the rear end cover of the relay and tighten the bolts; S45. Use a jack, chain hoist, or hydraulic system to push the new relay lever out 50% of its stroke; S46. Loosen the jacking bolt of the super nut 5, use a jack or copper rod to adjust the crosshead 42 of the relay to be absolutely horizontal in the X direction, tighten the jacking bolt symmetrically, use a level to measure the horizontality of the crosshead in the Y direction on the upper surface of the crosshead 42, and use a level to measure the elevation difference between the control ring handle 31, the crosshead 42 and the reference point 61. S47. Adjust the level, elevation, lateral position, and tilt of the relay to meet technical requirements. Monitor the adjustment process using a dial indicator on the rear cover frame. Adjust the left and right positions of the relay using the La and Lb data in S14; The relay race was leveled using a level measuring instrument, including both the X and Y directions. The elevation difference between the control ring handle 31, crosshead 42 and benchmark point 61 is measured and adjusted using a level instrument. When the screw hole of the rear end cap of the relay interferes with the connecting bolt, the screw hole of the rear end cap needs to be enlarged. When the relay is horizontal or tilted to the left or right and cannot meet the above requirements, it can be adjusted by adding a shim between the rear end cover of the relay and the adjusting shim 8. When the amount of shim added is no more than 0.2mm, the shim plate 8 is adjusted by grinding to meet the requirements; When the shim addition is greater than 0.2mm, measure the distance from the rear end cap of the relay to the base plate, and calculate the thickness of the newly adjusted shim in each direction using this distance. See [reference needed]. Figure 2 , 3 Process a new pad according to the thickness, mark the slope direction, pull out the new relay, remove the previously installed adjustment pad 8, install the new adjustment pad 8, and repeat the above steps until the adjustment is qualified. S48. After the relay is adjusted to be qualified, install all the connecting bolts connecting the relay 4 to the mounting base plate 7; S49. Stretch all connecting bolts to the specified tension value and record it. Check the elevation, level and center of the relay. After the check is qualified, drill and ream positioning pin holes on the rear end cover of the relay, the adjusting pad 8 and the mounting base plate 7, and drive in the positioning pins. The relays 4 on both sides can be installed at the same time or on separate sides.

[0029] The above steps are used to adjust and install the new relay.

[0030] In S5, the following steps are included: S50. The clamping stroke of the relay is adjusted when the top cover 1, control ring 3 and water guiding mechanism are connected; S51. See also Figure 4 When the double connecting plate 43 is not connected, the relay is fully closed. Use a jack or copper rod to adjust the crosshead of the relay to be horizontal in the X direction by no more than 0.02mm / m. Tighten the push bolt of the super nut 5 according to the standard torque. Use an inside micrometer to measure the distance C and D from the end face of the 1# and 2# relays to the measuring point of the crosshead respectively. S52. Connect the double connecting plate 43, use hydraulic pressure to drive the guide vane 2 to a certain opening degree, and ensure that the gap between each guide vane 2 is uniform and qualified. Then use hydraulic pressure to drive the guide vane 2 to close completely, and the guide vane vertical gap measurement and adjustment are qualified. S53. See also Figure 5 Install dial gauges 10 on relays #1 and #2 to monitor the displacement of the push-pull rods. Apply oil pressure of no more than 0.5 MPa and push the guide vane to the fully closed position. The dial gauges will stop moving. Then remove the oil pressure. The dial gauges will stop moving. Zero the dial gauges. S54. Gradually increase the pressure to the guide vane clamping oil pressure and maintain the pressure. After the dial indicator stabilizes, take the reading and record it. S55. After the dial indicator stabilizes, use an inside micrometer to measure the distances C1 and D1 from the end face of relays #1 and #2 to the crosshead measuring point, respectively; S56. Calculate the thicknesses A1 and A2 of the two side clamping stroke adjusting shims 9; Among them, relay 1 A1=A+(C-C1), relay 2 B1=B-(D-D1); S57. Process the adjusting shim ring 9 according to the calculated thickness, and accurately measure the actual thickness with an outside micrometer after processing; S58. Replace the adjusting washer 9; reverse the oil pipe of the relay pressurization device, use hydraulic pressure to drive the guide vane to move in the opening direction, and move the push rod 5-10cm; loosen the super nut 5 and turn it outward a certain distance; use hydraulic pressure to drive the push rod to move upstream, remove the temporary adjusting washer, replace the adjusting washer, use the push bolt or hydraulic pressure to make the adjusting washer and the push rod stick together, and tighten the push bolt of the super nut 5 to 75% of the rated torque; S59. Verify the clamping stroke and synchronization; the standard for the qualified adjustment of the relay clamping stroke is that, under the action of clamping oil pressure, the pistons of both relays simultaneously contact the end cap. Gradually increase the pressure to the guide vane clamping oil pressure according to the operation in S53 and S54. If the pistons of the two relays do not simultaneously contact the end cap under the guide vane clamping oil pressure, it is necessary to make a fine adjustment to the adjusting shim ring according to the dial indicator reading, and then repeat S57-S59; after the clamping stroke is qualified, tighten the push bolt of the super nut 5 to the rated torque.

[0031] The above steps are used to adjust and determine the clamping stroke of the new relay.

[0032] In S6, the following steps are included: S60. After the position of the servo motor is adjusted, begin the piping work for the opening and closing chamber oil pipes of the servo motor; after the opening and closing chamber oil pipes of the servo motor are connected, conduct a pressure test on the opening and closing chamber oil pipes of the servo motor to ensure that there is no leakage, no deformation and no abnormal noise. S61. Once the drain valve is installed, the drain pipe of the relay can be connected. S62. Once the relay position is adjusted and the automatic locking device is installed, perform the coupling of the locking relay oil pipe.

[0033] The installation of the relay piping is completed by following the above steps.

[0034] In S7, the following steps are included: S70. If the old switch chamber and three-section throttle can be installed on the new relay, then use the old throttle; otherwise, process the new throttle according to the orifice diameter of the old throttle and install it. S71. Install the oil pipe in the relay switch chamber; S72. Install a mechanical displacement indicator device for the relay according to the actual position of the relay and the extension direction of the push-pull rod; S73. Install the segmented closing bracket according to the actual position of the relay, the extension direction and height of the push-pull rod, and the segmented closing inflection point; S74. Install segmented shut-off and locking tubing; S75. If the locking device has been assembled and tested in the factory and the assembly is confirmed to be qualified, the locking device does not need to be adapted on site; otherwise, when the No. 1 servo is fully closed and the No. 2 servo is fully open, the locking pin, locking pin pad, locking bracket and locking position sensor for automatic locking and manual locking should be installed and adjusted respectively.

[0035] The above steps complete the installation of the relay accessories.

[0036] By selecting reference points for adjusting the center, elevation, and torsion of the relay on the concrete steel plate lining on one side of the relay, and adjusting the tilt of the relay by adjusting the shims, the accuracy of the modification and installation was ensured, and the replacement of the relay was realized.

Claims

1. A method of retrofitting a hydraulic turbine generator unit servomotor, characterized by, Includes the following steps: S1: On-site data measurement and disassembly of the old relay (4), wherein a measurement reference point (61) is selected on the concrete steel plate lining (6) on one side of the relay (4). S2: Re-drill and tap the bolt holes on the mounting base plate (7) of the relay (4); S3: Install the new relay (4) on the crosshead (42); S4: Install the relay (4) onto the mounting base plate (7) and adjust the tilt of the relay (4) by adjusting the pad (8); S5: Adjustment of the clamping stroke of the relay (4); S6: Relay (4) piping installation; S7: Relay device (4) accessory installation; S1 includes the following steps: S10. Adjust the guide vane to 50% opening, release the pressure and drain the oil from the relay (4), remove the double connecting plate (43), and disconnect the oil pipe of the switch chamber of the relay (4); S11. Use a hand hoist or jack to adjust the push-pull rod (41) of the relay (4) to the 50% stroke position of the relay, and record the extension length of the push-pull rod (41); S12. Use a jack or copper rod to adjust the crosshead (42) of the relay in the X direction to be no more than 0.02 mm / m horizontally; S13. Use a level to measure the horizontal position of the crosshead (42) in the Y direction, and use a level to measure the elevation difference between the control ring handle (31), the crosshead (42) and the reference point (61); S14. On the reference point (61) at the same height as the push-pull rod (41) on one side of the relay, select the position measuring points a and b at intervals, and use an inside micrometer to measure the distances La and Lb from the measuring points to the push-pull rod (41).

2. The method for modifying and installing a hydro-generator set relay according to claim 1, characterized in that, S2 includes the following steps: S20. After the old relay is lifted out of the machine pit, the new relay installation holes are marked on the mounting base plate (7) with the old relay installation hole position as the reference. S21. Drill and tap the marked holes.

3. The method for modifying and installing a hydro-generator set relay according to claim 1, characterized in that, S3 includes the following steps: S30. Remove the crosshead (42) of the old relay; S31. Measure the thicknesses d1 and d2 of the two old relay clamping stroke adjustment pads (9); S32. Machining two temporary adjustment shims for the clamping stroke: the thickness of the temporary adjustment shim for relay #1 is A=d1-15mm, and the thickness of the temporary adjustment shim for relay #2 is B=d2+15mm; wherein, the temporary adjustment shims are two semi-circular rings; S33. Install the crosshead (42) and temporary adjusting washer ring onto the new relay, and tighten the four push bolts of the super nut (5) symmetrically.

4. The method for modifying and installing a hydro-generator set relay according to claim 1, characterized in that, S4 includes the following steps: S40. After the top cover (1) is reinstalled and the top cover positioning pin is installed, after the bolt holes for mounting the relay (4) on the mounting base plate (7) are machined on at least one side, the new relay installation work begins; wherein, the top cover positioning pin is installed in at least 8 directions, and 4 pins are tightened in each direction; S41. Check that the new bolt holes on the mounting base plate (7) are qualified, clean and check that the adjusting shim plate (8) is free of high points and burrs, and install the adjusting shim plate (8) onto the mounting base plate (7) through the countersunk hole (81) bolt; S42. Hoist the new relay (4) into the installation position; S43. When the rear end cover of the new relay (4) is 5-20mm away from the adjusting pad, adjust the relay so that the bolt holes of the rear end cover of the relay are aligned with the bolt holes of the mounting base plate (7), and insert all connecting bolts. S44. Use four symmetrical connecting bolts to close the joint of the rear end cover of the relay and tighten the bolts; S45. Use a jack, chain hoist, or hydraulic system to push the new relay lever out 50% of its stroke; S46. Loosen the push bolt of the super nut (5), use a jack or copper rod to adjust the crosshead (42) of the relay to be no more than 0.02mm / m in the X direction, tighten the 8 push bolts symmetrically, use a level to measure the horizontal position of the crosshead (42) in the Y direction, and use a level to measure the elevation difference between the control ring handle (31), the crosshead (42) and the reference point (61); S47. Adjust the level, elevation, lateral position, and tilt of the relay to meet technical requirements. Monitor the adjustment process using a dial indicator on the rear cover frame. Adjust the left and right positions of the relay using the La and Lb data in S14; The relay race was leveled using a level measuring instrument, including both the X and Y directions. The elevation difference between the control ring handle (31), crosshead (42) and the benchmark point (61) is measured and adjusted using a level instrument. When the screw hole of the rear end cap of the relay interferes with the connecting bolt, the screw hole of the rear end cap needs to be enlarged. When the relay is horizontal or tilted to the left or right, it cannot meet the above requirements. Adjustment is made by adding a shim between the rear end cover of the relay and the adjustment shim (8). When the amount of padding is no more than 0.2mm, the padding plate (8) is adjusted by grinding to meet the requirements; When the padding amount is greater than 0.2mm, measure the distance from the rear end cover of the relay to the base plate, and calculate the thickness of the new adjustment pad in each direction based on the distance. Process the new pad according to the thickness, mark the slope direction, pull out the new relay, remove the previously installed adjustment pad (8), install the new adjustment pad (8), and repeat the above steps until the adjustment is qualified. S48. After the relay is adjusted to be qualified, install the connecting bolts connecting all the relays (4) to the mounting base plate (7); S49. Stretch all connecting bolts to the specified stretch value and record it. Check the elevation, level and center of the relay. After the check is qualified, drill and ream positioning pin holes on the rear end cover of the relay, the adjusting pad (8) and the mounting base plate (7) and drive in the positioning pins. The relays (4) on both sides can be installed at the same time or on separate sides.

5. The method for modifying and installing a hydro-generator set relay according to claim 1, characterized in that, In S5, the following steps are included: S50. The clamping stroke of the relay is adjusted after the top cover (1), control ring (3) and water guiding mechanism are connected; S51. When the double connecting plate (43) is not connected, the relay is fully closed. Use a jack or copper rod to adjust the crosshead of the relay in the X direction to be no more than 0.02 mm / m horizontally. Tighten the push bolt of the super nut (5) according to the standard torque. Use an inside micrometer to measure the distance C and D from the end face of the 1# and 2# relays to the crosshead measuring point respectively. S52. Connect the double plate (43), use hydraulic pressure to drive the guide vane (2) to a certain opening, and ensure that the gap between each guide vane (2) is uniform and qualified. Then use hydraulic pressure to drive the guide vane (2) to close completely, and the guide vane vertical gap measurement and adjustment are qualified. S53. Install dial gauges (10) on relays #1 and #2 respectively to monitor the displacement of the push-pull rod. Apply oil pressure of no more than 0.5MPa and push the guide vane to the fully closed position. The dial gauge will stop moving. Then remove the oil pressure. The dial gauge will stop moving. Zero the dial gauge. S54. Gradually increase the pressure to the standard guide vane clamping oil pressure and maintain the pressure. After the dial indicator stabilizes, take the reading and record it. S55. After the dial indicator stabilizes, use an inside micrometer to measure the distances C1 and D1 from the end face of relay #1 and #2 to the crosshead measuring point, respectively. S56. Calculate the thicknesses A1 and A2 of the two sides of the clamping stroke adjusting pad ring (9); Among them, relay 1 A1=A+(C-C1), relay 2 B1=B-(D-D1); S57. Process the adjusting shim ring (9) according to the calculated thickness, and accurately measure the actual thickness with an outside micrometer after processing; S58. Replace the adjusting shim (9); reverse the oil pipe of the relay pressurization device, use oil pressure to drive the guide vane to move in the opening direction, and move the push rod 5-10cm; loosen the super nut (5) and turn it outward a distance; use oil pressure to drive the push rod to move upstream, take out the temporary adjusting shim, replace the adjusting shim, use the push bolt or oil pressure to make the adjusting shim and the push rod stick together, and tighten the push bolt of the super nut (5) according to 75% of the rated torque; S59. Verify the clamping stroke and synchronization; the standard for the qualified adjustment of the clamping stroke of the relay is that, under the action of the clamping oil pressure, the pistons of the two relays simultaneously stick to the end cover; according to the operation in S53 and S54, gradually increase the pressure to the standard oil pressure of the guide vane clamping. When the pistons of the two relays do not simultaneously stick to the end cover under the guide vane clamping oil pressure, it is necessary to make a fine adjustment to the adjusting shim ring according to the dial indicator reading, and then repeat S57-S59; after the clamping stroke is qualified, tighten the push bolt of the super nut (5) to the rated torque.

6. The method for modifying and installing a hydro-generator set relay according to claim 1, characterized in that, In S6, the following steps are included: S60. After the position of the servo motor is adjusted, begin the piping work for the opening and closing chamber oil pipes of the servo motor; after the opening and closing chamber oil pipes of the servo motor are connected, conduct a pressure test on the opening and closing chamber oil pipes of the servo motor according to the technical requirements to ensure that there is no leakage, no deformation and no abnormal noise. S61. Once the drain valve is installed, the drain pipe of the relay can be connected. S62. Once the relay position is adjusted and the automatic locking device is installed, perform the coupling of the locking relay oil pipe.

7. The method for modifying and installing a hydro-generator set relay according to claim 1, characterized in that, In S7, the following steps are included: S70. If the old switch chamber and three-section throttle can be installed on the new relay, then use the old throttle; otherwise, process a new throttle according to the orifice diameter of the old throttle and install it. S71. Install the oil pipe in the relay switch chamber; S72. Install a mechanical displacement indicator device for the relay according to the actual position of the relay and the extension direction of the push-pull rod; S73. Install the segmented closing bracket according to the actual position of the relay, the extension direction and height of the push-pull rod, and the segmented closing inflection point; S74. Install segmented shut-off and locking tubing; S75. If the locking device has been assembled and tested in the factory and the assembly is confirmed to be qualified, the locking device does not need to be adapted on site; otherwise, when the No. 1 servo is fully closed and the No. 2 servo is fully open, the locking pin, locking pin pad, locking bracket and locking position sensor for automatic locking and manual locking should be installed and adjusted respectively.

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