A rigid support electric disc turning method for vertical shaft semi-umbrella type hydroelectric generator set

Abstract

The application discloses a rigid support electric turning method for vertical shaft semi-umbrella type hydroelectric generator set, which comprises the following steps: turning preparation, erecting a dial gauge on an operating oil pipe, checking the gap between a rotating part and a fixed part, and turning, wherein the turning method is as follows: constant direct current is supplied to a generator rotor winding, and the stator is sequentially and cyclically supplied with current in the order of A, B and C three phases in an intermittent mode; when the electromagnetic torque generated by the magnetic field is greater than the friction torque of the rotor, the rotor rotates by one electrical angle; until the magnetic axes of the stator and the rotor coincide, the rotor stops rotating, that is, a measuring point is reached; after reading is completed, the current is supplied to another phase of the stator, so that the rotor rotates by one electrical angle again; the above process is repeated until reading of all measuring points is completed. The application only turns the upper guide bearing tile during turning, optimizes the turning process, adopts electric turning driving, reduces operation intensity, and improves the turning efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of turning gear for vertical shaft semi-umbrella type hydro turbine generator sets, and specifically relates to a method for rigid support electric turning gear for vertical shaft semi-umbrella type hydro turbine generator sets. Background Technology

[0002] A hydroelectric generator unit at a certain hydropower station has a vertical shaft semi-umbrella structure. The turbine runner is an axial-flow propeller type with no lower guide bearing. The thrust bearing support structure is a support bolt tray type, and the turning gear is a rigid turning gear driven by an electric automatic turning gear. To facilitate major overhauls of the unit, turning gear operation is required during both disassembly and reassembly phases to measure and adjust the unit's axis. Therefore, a rigid support electric turning gear method for a vertical shaft semi-umbrella type hydroelectric generator unit is proposed. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method for rigid support electric turning gear for vertical shaft semi-umbrella type hydro turbine generator sets. The aim is to measure the main shaft runout and adjust the unit's axis to ensure that the runout and other data of the unit after maintenance meet technical standards.

[0004] This invention provides a method for rigidly supporting an electric turning gear in a vertical shaft semi-umbrella type hydro-turbine generator set, comprising the following steps:

[0005] S1 Turnaround Preparation:

[0006] S1-1 Query the upper guide center determined during the last major overhaul or the pre-overhaul rotation. Select one upper guide bearing at each of the four positive directions of the upper guide for bearing clamping. After clamping, ensure that the center deviation is ≯0.02mm and the bearing gap is 0.03-0.05mm. Apply D40 grease evenly on the mirror plate to establish a lubricating oil film.

[0007] S1-2 Processing work orders for electric turning gear wiring, turning gear power supply wiring, and electric turning gear contact work orders; Rotor slip ring overhaul completed and brush holder installed and adjusted to ensure excitation device can supply power to rotor; Electric turning gear wiring completed;

[0008] S2 Operating oil pipe dial indicator installation: Install the operating oil pipe swing measuring bracket in the +X and +Y directions of the upper frame, tighten the fastening bolts of the measuring bracket to ensure that the bracket is installed firmly, and leave a certain gap between the measuring bracket and the main shaft and operating oil pipe so that the measuring bracket does not obstruct the rotation of the main shaft and operating oil pipe. Install the dial indicator on the measuring bracket, and the installation height of the dial indicator corresponds to the height of the floating bearing of the oil receiver, so that the dial indicator needle is perpendicular to the operating oil pipe, and the dial indicators at the same measuring position in the +X and +Y directions are at the same height.

[0009] S3 upper guide bearing:

[0010] S3-1 Use an inside micrometer to measure the distance from the upper guide bracket to the shaft collar in the four directions of ±X and ±Y according to the marked position. The computer group is the center of the upper guide. Based on the measurement center of the upper guide and the target center, the displacement of the main shaft center X1 and Y1 is calculated.

[0011] S3-2 Install dial indicators in the ±X and ±Y directions on the upper guide plate, and adjust the small needle to about 5mm and the large needle to 0;

[0012] S3-3 Loosen all guide vane clearance adjustment devices and monitor the dial gauge reading;

[0013] S3-4 Use an oil sprayer to spray turbine oil into the surface of the bearing tile and rub it.

[0014] S3-5 uses the anti-weight bolt to push the X-direction guide shoe to push the main shaft, causing the pointer reading to change by X1+0.02mm. The symmetrical direction retaining shoe pushes the main shaft in the opposite direction, restoring the pointer reading to X1.

[0015] S3-6 Use the anti-weight bolt to push the Y-direction guide shoe to push the main shaft, so that the pointer changes the reading Y1+0.02mm. Then, clamp the shoe in the symmetrical direction to restore the pointer reading to Y1. During the clamping process in the Y direction, monitor the reading of the dial indicator in the X direction. After the clamping is completed, the reading of the dial indicator in the X direction should remain unchanged at X1.

[0016] S3-7 Retest the upper guide center. If it fails, repeat the adjustment until it passes.

[0017] S4 Check the gap between rotating and stationary parts;

[0018] S5 turntable:

[0019] On S5-1, dial indicators are installed on the upper and lower flange faces of the guide shaft collar, water guide shaft collar, turbine and generator coupling in the +X and +Y directions. A level instrument is installed on the thrust head in the +X and +Y directions and its position is marked.

[0020] After the S5-2 rotating and fixed component clearance inspection and safety measures are completed, notify the power supply of the tray loading vehicle.

[0021] S5-3 uses a spray bottle to spray oil onto the bearing pad surface for lubrication. The test plate is jogged to check that the unit rotates without any abnormal noise and that the changes in the dial gauge readings are no greater than 0.10 mm. If any abnormality is found, the rotation should be stopped and the cause of the abnormality should be checked.

[0022] After the S5-4 test plate passes the test, mark 8 measuring points evenly on the upper guide. The measuring points are numbered clockwise, starting from +Y.

[0023] After the S5-5 dial indicator is zeroed and the level is recorded, the cranking commander issues the start cranking command. During the cranking process, oil is sprayed intermittently to lubricate the bearing.

[0024] The S5-6 rotor is rotated to a measuring point. After the rotor stops and stabilizes, the reading is taken. After the reading is taken, the rotor is rotated to the next measuring point and the reading is taken again until it returns to the origin. The data of returning to zero at the origin is recorded. The change of the zero pointer is no more than 0.02mm. The rotating data is valid.

[0025] After the S5-7 turning cycle is completed, power is cut off and protective measures are taken. The air gap is measured and recorded. The gap values ​​of the three magnetic poles at each of the eight evenly distributed points are measured. The air shroud gap is measured and recorded. The wheel chamber gap and the center gap of the upper guide and water guide are measured and recorded at the eight evenly distributed points.

[0026] S6 turntable data processing.

[0027] Preferably, the method for turning the generator in steps S5-6 is as follows: a constant DC current is supplied to the generator rotor winding, and the stator is intermittently and cyclically supplied with current in a fixed order of the three phases A, B, and C. When the electromagnetic torque generated by the magnetic field is greater than the frictional torque of the rotor, the rotor rotates by an electrical angle until the magnetic axes of the stator and rotor coincide, at which point the rotor stops rotating, thus reaching a measuring point. After reading the value, current is supplied to another phase of the stator, causing the rotor to rotate by another electrical angle. The above process is repeated until all measuring point readings are completed. During the turning process, only the upper guide bearing is engaged, while the water guide bearing is in a free state.

[0028] Preferably, step S4 specifically includes:

[0029] S4-1 Check the clearance between the upper guide plate and the main shaft to ensure there are no foreign objects or scratches;

[0030] S4-2 Check the air gap between the stator and rotor to ensure there are no foreign objects;

[0031] S4-3 Check that there are no foreign objects on the damper plate;

[0032] S4-4 Check the thrust head and oil tank cover to ensure there is no scratching;

[0033] S4-5 Check the water guide bearing area to ensure there are no foreign objects or scratches;

[0034] S4-6 Check the clearance between the impeller blades and the middle ring; the clearance should not be less than 3mm.

[0035] S4-7 Check the gap between the impeller maintenance frame and the drain cone, ensuring it is not less than 10mm;

[0036] S4-8 Inspect the upper and lower blade ladders. Lay down the upper blade ladder to avoid interfering with the rotation of the impeller.

[0037] Preferably, before turning the engine in step S5, fences are erected around the upper guide, wind tunnel, waterwheel room, and spiral casing, and signs saying "Unauthorized personnel are strictly prohibited from entering" are posted.

[0038] Preferably, the following abnormal phenomena usually occur in step S5-3: 1) The rotor cannot be turned and the rotation torque is insufficient. Solution: Increase the turning current appropriately; if the guide bearing is too tight, it needs to be re-clamped and the gap should be appropriately increased; if the lubricating oil film of the mirror plate is not sufficiently established, the rotor should be re-pushed and a high-strength grease should be applied; 2) The dial indicator reading changes too much. Solution: After checking that the indicator frame is not abnormal, re-clamp the bearing and appropriately reduce the bearing gap.

[0039] Preferably, the S6 manual transmission data processing specifically includes the following steps:

[0040] S6-1 calculates the horizontal value of the thrust bearing and the center deviation of each rotating part based on the turning gear record data;

[0041] Compare S6-2 with the turning gear qualification standard to confirm whether the turning gear is qualified. The turning gear qualification standard includes:

[0042] a. The level of the mirror plate should be ≤0.02mm / m: Calculation method: Calculate the horizontal vector of the mirror plate according to the orientation of each measuring point: X=(2 / n)∑Ai*cos(Bi*PI / 180); Y=(2 / n)∑Ai*sin(Bi*PI / 180), levelness L=sqrt(X2+Y2), where: Ai is the reading of the level instrument at each measuring point, Bi is the azimuth angle of each measuring point, i=1,2,3…n, n=8;

[0043] b. The air gap between the stator and rotor should be uniform. The deviation of the air gap at each point from the actual average gap should not exceed ±10% of the actual average gap.

[0044] c. The absolute runout at the upper guide shaft collar is ≤0.05mm, and the relative runout at the water guide shaft collar is ≤0.05mm / m;

[0045] d. The swing at the large copper bearing of the oil receiver operating pipe is ≤0.30mm, and the swing at the small copper bearing is ≤0.50mm.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] This invention provides a method for rigid support electric turning gear for a vertical shaft semi-umbrella type hydro turbine generator set. For rigid turning gear, the general process requires simultaneous bearing clamping of the upper guide bearing and the water guide bearing during turning gear. This method only clamps the upper guide bearing, optimizing the turning gear process. At the same time, it adopts electric turning gear drive, reducing the labor intensity and improving the turning gear efficiency.

[0048] This invention provides a method for rigid support electric turning gear of a vertical shaft semi-umbrella type hydro turbine generator set. Using this method, the turning gear data of each part of the generator set axis is accurate and valid, which can be used for axis data processing and calculation, and axis adjustment accordingly.

[0049] The present invention provides a method for rigid support electric turning gear of vertical shaft semi-umbrella type hydro turbine generator set, which has been successfully applied to the turning gear of a hydropower station unit, and successfully completed the turning gear process before and after the unit repair. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the turbine generator set structure involved in a rigid support electric turning gear method for a vertical shaft semi-umbrella type turbine generator set in one embodiment of the present invention. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] This invention relates to a rigid-support electric turning gear method for vertical shaft semi-umbrella type hydro-turbine generator sets. A structural schematic diagram of the vertical shaft semi-umbrella type hydro-turbine generator set is provided below. Figure 1 .

[0053] As a preferred embodiment of the present invention, this embodiment provides a method for rigidly supporting an electric turning gear for a vertical shaft semi-umbrella type hydro-turbine generator set, comprising the following steps:

[0054] S1 Turnaround Preparation:

[0055] S1-1 Query the upper guide center determined during the last major overhaul or the pre-overhaul rotation. Select one upper guide bearing at each of the four positive directions of the upper guide for bearing clamping. After clamping, ensure that the center deviation is ≯0.02mm and the bearing gap is 0.03-0.05mm. Apply D40 grease evenly on the mirror plate to establish a lubricating oil film.

[0056] S1-2 Processing work orders for electric turning gear wiring, turning gear power supply wiring, and electric turning gear contact work orders; Rotor slip ring overhaul completed and brush holder installed and adjusted to ensure excitation device can supply power to rotor; Electric turning gear wiring completed;

[0057] S2 Operating oil pipe dial indicator installation: Install the operating oil pipe swing measuring bracket in the +X and +Y directions of the upper frame, tighten the fastening bolts of the measuring bracket to ensure that the bracket is installed firmly, and leave a certain gap between the measuring bracket and the main shaft and operating oil pipe so that the measuring bracket does not obstruct the rotation of the main shaft and operating oil pipe. Install the dial indicator on the measuring bracket, and the installation height of the dial indicator corresponds to the height of the floating bearing of the oil receiver, so that the dial indicator needle is perpendicular to the operating oil pipe, and the dial indicators at the same measuring position in the +X and +Y directions are at the same height.

[0058] S3 upper guide bearing:

[0059] S3-1 Use an inside micrometer to measure the distance from the upper guide bracket to the shaft collar in the four directions of ±X and ±Y according to the marked position. The computer group is the center of the upper guide. Based on the measurement center of the upper guide and the target center, the displacement of the main shaft center X1 and Y1 is calculated.

[0060] S3-2 Install dial indicators in the ±X and ±Y directions on the upper guide plate, and adjust the small needle to about 5mm and the large needle to 0;

[0061] S3-3 Loosen all guide vane clearance adjustment devices and monitor the dial gauge reading;

[0062] S3-4 Use an oil sprayer to spray turbine oil into the surface of the bearing tile and rub it.

[0063] S3-5 uses the anti-weight bolt to push the X-direction guide shoe to push the main shaft, causing the pointer reading to change by X1+0.02mm. The symmetrical direction retaining shoe pushes the main shaft in the opposite direction, restoring the pointer reading to X1.

[0064] S3-6 Use the anti-weight bolt to push the Y-direction guide shoe to push the main shaft, so that the pointer changes the reading Y1+0.02mm. Then, clamp the shoe in the symmetrical direction to restore the pointer reading to Y1. During the clamping process in the Y direction, monitor the reading of the dial indicator in the X direction. After the clamping is completed, the reading of the dial indicator in the X direction should remain unchanged at X1.

[0065] S3-7 Retest the upper guide center. If it fails, repeat the adjustment until it passes.

[0066] S4 Check the gap between rotating and stationary parts;

[0067] S5 turntable:

[0068] On S5-1, dial indicators are installed on the upper and lower flange faces of the guide shaft collar, water guide shaft collar, turbine and generator coupling in the +X and +Y directions. A level instrument is installed on the thrust head in the +X and +Y directions and its position is marked.

[0069] After the S5-2 rotating and fixed component clearance inspection and safety measures are completed, notify the power supply of the tray loading vehicle.

[0070] S5-3 uses a spray bottle to spray oil onto the bearing pad surface for lubrication. The test plate is jogged to check that the unit rotates without any abnormal noise and that the changes in the dial gauge readings are no greater than 0.10 mm. If any abnormality is found, the rotation should be stopped and the cause of the abnormality should be checked.

[0071] After the S5-4 test plate passes the test, mark 8 measuring points evenly on the upper guide. The measuring points are numbered clockwise, starting from +Y.

[0072] After the S5-5 dial indicator is zeroed and the level is recorded, the cranking commander issues the start cranking command. During the cranking process, oil is sprayed intermittently to lubricate the bearing.

[0073] The S5-6 rotor is rotated to a measuring point. After the rotor stops and stabilizes, the reading is taken. After the reading is taken, the rotor is rotated to the next measuring point and the reading is taken again until it returns to the origin. The data of returning to zero at the origin is recorded. The change of the zero pointer is no more than 0.02mm. The rotating data is valid.

[0074] After the S5-7 turning cycle is completed, power is cut off and protective measures are taken. The air gap is measured and recorded. The gap values ​​of the three magnetic poles at each of the eight evenly distributed points are measured. The air shroud gap is measured and recorded. The wheel chamber gap and the center gap of the upper guide and water guide are measured and recorded at the eight evenly distributed points.

[0075] S6 turntable data processing.

[0076] In the above embodiment, the turning method of step S5-6 is as follows: a constant DC current is supplied to the generator rotor winding, and the stator is continuously and cyclically supplied with current in a fixed order of the three phases A, B, and C. When the supplied current just makes the polarities of the two magnetic fields opposite, the two magnetic fields attract each other, and vice versa. Therefore, when the electromagnetic torque generated by the magnetic field is greater than the frictional torque of the rotor, the rotor rotates by an electrical angle until the magnetic axes of the stator and rotor coincide, at which point the rotor stops rotating, that is, a measuring point is reached. After the reading is completed, the current is supplied to another phase of the stator, causing the rotor to rotate by another electrical angle. The above process is repeated until all measuring point readings are completed. During the turning, only the upper guide bearing is bearing engaged, while the water guide bearing is in a free state.

[0077] In some embodiments, step S4 specifically includes:

[0078] S4-1 Check the clearance between the upper guide plate and the main shaft to ensure there are no foreign objects or scratches;

[0079] S4-2 Check the air gap between the stator and rotor to ensure there are no foreign objects;

[0080] S4-3 Check that there are no foreign objects on the damper plate;

[0081] S4-4 Check the thrust head and oil tank cover to ensure there is no scratching;

[0082] S4-5 Check the water guide bearing area to ensure there are no foreign objects or scratches;

[0083] S4-6 Check the clearance between the impeller blades and the middle ring; the clearance should not be less than 3mm.

[0084] S4-7 Check the gap between the impeller maintenance frame and the drain cone, ensuring it is not less than 10mm;

[0085] S4-8 Inspect the upper and lower blade ladders. Lay down the upper blade ladder to avoid interfering with the rotation of the impeller.

[0086] In some preferred embodiments, to ensure the safety of the turning process, before turning the engine in step S5, fences are erected around the upper guide, wind tunnel, waterwheel room, and volute, and signs saying "Unauthorized personnel are strictly prohibited from entering" are posted.

[0087] In some preferred embodiments, the following abnormal phenomena typically occur in step S5-3: 1) The rotor cannot be turned, and the rotation torque is insufficient. Solutions: Increase the turning current appropriately; if the guide bearings are too tight, re-grip them and appropriately increase the clearance; if the lubricating oil film on the mirror plate is insufficient, re-push the rotor and apply a high-performance grease; 2) The dial indicator reading fluctuates too much. Solutions: After checking that the indicator frame is normal, re-grip the bearings and appropriately reduce the bearing clearance.

[0088] In some preferred embodiments, the S6 turning gear data processing specifically includes the following steps:

[0089] S6-1 calculates the horizontal value of the thrust bearing and the center deviation of each rotating part based on the turning gear record data;

[0090] Compare S6-2 with the turning gear qualification standard to confirm whether the turning gear is qualified. The turning gear qualification standard includes:

[0091] a. The level of the mirror plate should be ≤0.02mm / m: Calculation method: Calculate the horizontal vector of the mirror plate according to the orientation of each measuring point: X=(2 / n)∑Ai*cos(Bi*PI / 180); Y=(2 / n)∑Ai*sin(Bi*PI / 180), levelness L=sqrt(X2+Y2), where: Ai is the reading of the level instrument at each measuring point, Bi is the azimuth angle of each measuring point, i=1,2,3…n, n=8;

[0092] b. The air gap between the stator and rotor should be uniform. The deviation of the air gap at each point from the actual average gap should not exceed ±10% of the actual average gap.

[0093] c. The absolute runout at the upper guide shaft collar is ≤0.05mm, and the relative runout at the water guide shaft collar is ≤0.05mm / m;

[0094] d. The swing at the large copper bearing of the oil receiver operating pipe is ≤0.30mm, and the swing at the small copper bearing is ≤0.50mm.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for rigidly supporting an electric turning gear in a vertical shaft semi-umbrella type hydro-turbine generator set, characterized in that, Includes the following steps: S1 Turnaround Preparation: S1-1 Query the upper guide center determined during the last major overhaul or the pre-overhaul rotation. Select one upper guide bearing in each of the four directions of the upper guide for bearing clamping. After clamping, ensure that the center deviation is ≯0.02mm and the bearing gap is 0.03-0.05mm. Apply D40 grease evenly on the mirror plate to establish a lubricating oil film. S1-2 Processing work orders for electric turning gear wiring, turning gear power supply wiring, and electric turning gear contact work orders; Rotor slip ring overhaul completed and brush holder installed and adjusted to ensure excitation device can supply power to rotor; Electric turning gear wiring completed; S2 Operating Oil Pipe Dial Indicator Installation: Install operating oil pipe swing measuring brackets in the +X and +Y directions on the upper frame, tighten the fastening bolts of the measuring brackets to ensure that the brackets are installed stably, and leave a certain gap between the measuring brackets and the main shaft and operating oil pipes so that the measuring brackets do not obstruct the rotation of the main shaft and operating oil pipes. Install dial indicators on the measuring brackets, with the height of the dial indicators corresponding to the height of the floating bearing of the oil receiver, so that the dial indicator needle is perpendicular to the operating oil pipe, and the dial indicators at the same measuring position in the +X and +Y directions are at the same height. S3 upper guide bearing: S3-1 Use an inside micrometer to measure the distance from the upper guide bracket to the shaft collar in the four directions of ±X and ±Y according to the marked position. The computer group is the center of the upper guide. Based on the measurement center of the upper guide and the target center, the displacement of the main shaft center X1 and Y1 is calculated. S3-2 Install dial indicators in the ±X and ±Y directions on the upper guide plate, and adjust the small needle to about 5mm and the large needle to 0; S3-3 Loosen all guide vane clearance adjustment devices and monitor the dial gauge reading; S3-4 Use an oil sprayer to spray turbine oil into the surface of the bearing tile and rub it. S3-5 uses the anti-weight bolt to push the X-direction guide shoe to push the main shaft, causing the pointer reading to change by X1+0.02mm. The symmetrical direction retaining shoe pushes the main shaft in the opposite direction, restoring the pointer reading to X1. S3-6 Use the anti-weight bolt to push the Y-direction guide shoe to push the main shaft, so that the pointer changes the reading Y1+0.02mm. Then, clamp the shoe in the symmetrical direction to restore the pointer reading to Y1. During the clamping process in the Y direction, monitor the reading of the dial indicator in the X direction. After the clamping is completed, the reading of the dial indicator in the X direction should remain unchanged at X1. S3-7 Retest the upper guide center. If it fails, repeat the adjustment until it passes. S4 Check the gap between rotating and stationary parts; S5 turntable: On S5-1, dial indicators are installed on the upper and lower flange faces of the guide shaft collar, water guide shaft collar, turbine and generator coupling in the +X and +Y directions. A level instrument is installed on the thrust head in the +X and +Y directions and its position is marked. After the S5-2 rotating and stationary parts clearance inspection and safety measures are completed, notify the power supply of the plate-feeding vehicle. S5-3 uses a spray bottle to spray oil onto the bearing pad surface for lubrication. The test plate is jogged to check that the unit rotates without any abnormal noise and that the changes in the dial gauge readings are no greater than 0.10 mm. If any abnormality is found, the rotation should be stopped and the cause of the abnormality should be checked. After the S5-4 test plate passes the test, mark 8 measuring points evenly on the upper guide. The measuring points are numbered clockwise, starting from +Y. After the S5-5 dial indicator is zeroed and the level is recorded, the cranking commander issues the start cranking command. During the cranking process, oil is sprayed intermittently to lubricate the bearing. The S5-6 rotor is rotated to a measuring point. After the rotor stops and stabilizes, the reading is taken. After the reading is taken, the rotor is rotated to the next measuring point and the reading is taken again until it returns to the origin. The data of returning to zero at the origin is recorded. The change of the zero pointer is no more than 0.02mm. The rotating data is valid. After the S5-7 turning cycle is completed, power is cut off and protective measures are taken. The air gap is measured and recorded. The gap values ​​of the three magnetic poles at each of the eight evenly distributed points are measured. The air shroud gap is measured and recorded. The wheel chamber gap and the center gap of the upper guide and water guide are measured and recorded at the eight evenly distributed points. S6 turntable data processing.

2. The method for rigidly supporting an electric turning gear for a vertical shaft semi-umbrella type hydro-turbine generator set according to claim 1, characterized in that, The turning method in steps S5-6 is as follows: a constant DC current is supplied to the generator rotor winding, and the stator is intermittently cyclically supplied with current in a fixed order of the three phases A, B, and C. When the electromagnetic torque generated by the magnetic field is greater than the frictional torque of the rotor, the rotor rotates by an electrical angle until the magnetic shafts of the stator and rotor coincide and the rotor stops rotating, which means a measuring point has been reached. After the reading is completed, current is supplied to another phase of the stator, causing the rotor to rotate by another electrical angle. The above process is repeated until all measuring point readings are completed. During the turning process, only the upper guide bearing is engaged, while the water guide bearing is in a free state.

3. The method for rigidly supporting an electric turning gear for a vertical shaft semi-umbrella type hydro-turbine generator set according to claim 1, characterized in that, Step S4 specifically includes: S4-1 Check the clearance between the upper guide plate and the main shaft to ensure there are no foreign objects or scratches; S4-2 Check the air gap between the stator and rotor to ensure there are no foreign objects; S4-3 Check that there are no foreign objects on the damper plate; S4-4 Check the thrust head and oil tank cover to ensure there is no scratching; S4-5 Check the water guide bearing area to ensure there are no foreign objects or scratches; S4-6 Check the clearance between the impeller blades and the middle ring; the clearance should not be less than 3mm. S4-7 Check the gap between the impeller maintenance frame and the drain cone, ensuring it is not less than 10mm; S4-8 Inspect the upper and lower blade ladders. Lay down the upper blade ladder to avoid interfering with the rotation of the impeller.

4. The method for rigidly supporting an electric turning gear for a vertical shaft semi-umbrella type hydro-generator unit according to claim 1, characterized in that, Before turning the engine in step S5, fences are erected around the upper guide, wind tunnel, waterwheel room, and spiral casing, and signs saying "Unauthorized personnel are strictly prohibited from entering" are posted.

5. The method for rigidly supporting an electric turning gear for a vertical shaft semi-umbrella type hydro-turbine generator set according to claim 2, characterized in that, The following abnormal phenomena usually occur in step S5-3: 1) The rotor cannot be turned and the rotation torque is insufficient. Solution: Increase the turning current appropriately; if the guide bearing is too tight, it needs to be re-clamped and the gap should be appropriately increased; if the lubricating oil film of the mirror plate is not sufficiently established, the rotor should be re-pushed and a high-strength grease should be applied; 2) The dial indicator reading changes too much. Solution: After checking that the indicator frame is not abnormal, re-clamp the bearing and appropriately reduce the bearing gap.

6. The method for rigidly supporting an electric turning gear for a vertical shaft semi-umbrella type hydro-turbine generator set according to claim 1, characterized in that, S6 turnaround data processing specifically includes the following steps: S6-1 calculates the horizontal value of the thrust bearing and the center deviation of each rotating part based on the turning gear record data; Compare S6-2 with the turning gear qualification standard to confirm whether the turning gear is qualified. The turning gear qualification standard includes: a. The levelness L of the mirror plate should be ≤0.02mm / m: Calculation method: Calculate the horizontal vector of the mirror plate according to the orientation of each measuring point: X=(2 / n)∑Ai*cos(Bi*PI / 180); Y=(2 / n)∑Ai*sin(Bi*PI / 180), levelness L=sqrt(X²+Y²), where: Ai is the reading of the level instrument at each measuring point, Bi is the azimuth angle of each measuring point, i=1,2,3…n, n=8; b. The air gap between the stator and rotor should be uniform. The deviation of the air gap at each point from the actual average gap should not exceed ±10% of the actual average gap. c. The absolute runout at the upper guide shaft collar is ≤0.05 mm, and the relative runout at the water guide shaft collar is ≤0.05 mm / m; d. The swing at the large copper bearing of the oil receiver operating pipe is ≤0.30mm, and the swing at the small copper bearing is ≤0.50mm.

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