A tooling and method for aligning the center of a steam turbine rotor with the reference sump of the unit

Abstract

The present invention discloses a tooling and method for aligning the center of a steam turbine rotor with the reference sump of the unit, which relates to the technical field of steam turbine measurement. Conventional methods for aligning the center of a steam turbine rotor with the reference sump of the unit include the wire-pulling method, the dummy shaft method, and the method of measuring with an internal micrometer in cooperation with the rotor; the method of measuring with a special collar with an adjusting rod and a feeler gauge. These measurement methods are affected by factors such as deflection, calculation, measurement error, and narrow position, and the obtained data is not accurate. This tooling includes a hoop, a lever dial indicator, and a gauge position adjustment plate. It is installed on the steam turbine rotor through the hoop. By slowly turning the rotor, the relative data of the rotor with respect to the cylinder and the bearing pedestal in the up, down, left, and right directions are measured respectively by utilizing the rotation of the rotor, avoiding errors such as deflection, calculation, and measurement. During the process of aligning and adjusting the steam turbine rotor by rotation, there is a large reading space, the readings are stable, and the measured data is intuitive and accurate. The construction efficiency and accuracy are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine measurement, and particularly to a tooling and method for aligning the center of a steam turbine rotor with the reference pocket of the unit. Background Art

[0002] Steam turbine units are mainly applied in energy comprehensive utilization fields such as petrochemical, oil refining, metallurgy, chemical industry, pharmaceutical, regional cogeneration, and municipal waste power plants, and are key power equipment in various large industrial installations. During the installation and maintenance of steam turbine units, aligning the center of the steam turbine rotor with the unit components is one of the most critical tasks. Taking the alignment value between the steam turbine rotor and the pockets of the unit bearing housing, cylinder, etc. as the reference, the alignment of other components of the unit such as steam seals, diaphragms, retaining rings, oil seals, etc. is completed, so that the steam turbine rotor and each component of the unit are kept concentric, avoiding factors that affect the safety and efficiency of the unit such as uneven steam gaps and dynamic-static friction. At the same time, it also reduces the adjustment and scraping workload of components such as oil seals, steam seals, diaphragms, and retaining rings during construction, ensures an appropriate gap between the rotor and the oil seal and steam seal, reduces the steam flow disorder during operation, and enables the steam turbine to have higher thermal efficiency and good operation indicators.

[0003] The main reference pockets for unit alignment are the bearing housing pockets, the front and rear steam seal pockets of the cylinder, or the front and rear measurement rings of the cylinder. During construction, the center of the rotor and the center of the reference pocket are used as the reference for adjusting the through-flow gap of the unit and must be aligned concentrically. The maximum allowable difference between the centers of the two is 0.05 mm. The general measurement methods for aligning the center of the steam turbine rotor with the cylinder and bearing housing are the wire-pulling method, the dummy shaft method, and the method of measuring with an internal micrometer in cooperation with the rotor; the method of measuring with a special collar with an adjusting rod and a feeler gauge, and there are also some that use a steel strip in cooperation with a dial indicator for measurement. The first two measurement methods are affected by factors such as deflection, calculation, measurement error, and narrow position, and the obtained data is not accurate. The method of using a steel strip in cooperation with a dial indicator for measurement requires removing the screw components on the rotor, which is inconvenient to install, is easy to damage the rotor, and can only measure part of the data of the unit. Summary of the Invention

[0004] The technical problem to be solved and the technical task proposed by the present invention are to improve and refine the existing technical solutions, and provide a tooling and method for aligning the center of a steam turbine rotor with the reference pocket of the unit, aiming to improve the measurement accuracy, economy, and convenience of unit alignment. For this purpose, the present invention adopts the following technical solutions.

[0005] A centering tool for a steam turbine rotor and the reference sump of the unit, comprising a hoop, a lever dial indicator and a gauge position adjustment plate. The hoop is composed of two half-hoops connected by connecting bolts. The lever dial indicator is connected to the gauge position adjustment plate through a gauge clamp. The gauge position adjustment plate is connected to a connecting plate arranged on the outer side of the hoop through a connecting bolt. The gauge clamp can loosen and clamp the lever dial indicator. The connecting plate includes a straight connecting plate and an inclined connecting plate. The straight connecting plate and the inclined connecting plate are respectively arranged at the equal division positions of the two half-hoops and are both perpendicular to the tangent plane at the connection of the outer circumference of the half-hoop. The straight connecting plate is flush with the hoop in the axial direction of the hoop, and the inclined connecting plate has an inclination angle with the end plane of the hoop.

[0006] This tooling can be conveniently installed on the steam turbine rotor. According to the convenience requirements of gauge position measurement, the gauge clamp can be connected to the straight connecting plate or the inclined connecting plate. By slowly turning the rotor, using the rotation of the rotor, the relative data of the upper, lower, left and right of the rotor with the cylinder and the bearing pedestal can be measured respectively, avoiding errors such as deflection, calculation and measurement. During the process of centering the steam turbine rotor by rotation, there is a large reading space, the readings are stable, and the measured data is intuitive and accurate. At the same time, the tooling can also be visually monitored during the centering and adjustment of the unit, and the data changes during the process are clear at a glance, improving the construction efficiency and accuracy. This tooling has a simple structure, is easy to install and disassemble, has a wide application range, and will not cause damage to the equipment itself during the use process.

[0007] As a preferred technical means: a plurality of gauge clamp connection holes are arranged in a straight line along the length direction on the gauge position adjustment plate. A shaft pin is provided on the gauge clamp, and the shaft pin passes through the gauge clamp connection hole. The gauge clamp can rotate and be fastened according to the shaft pin. According to the measurement needs, the gauge clamp can be installed in different gauge clamp connection holes to make the measurement more accurate and convenient.

[0008] A method for centering a steam turbine rotor and the sumps of each unit, comprising the following steps:

[0009] 1) Select the measurement reference for rotor centering;

[0010] 2) Confirm the installation position of the rotor centering tooling;

[0011] 3) Trial installation of the rotor centering tooling;

[0012] 4) Check whether the installation of the tooling meets the requirements of centering measurement. If not, return to step 3);

[0013] 5) Formal installation of the rotor centering tooling;

[0014] 6) Confirm that the rotor centering tooling meets the requirements and measure the center value. If not, return to step 5);

[0015] 7) Adjust the center of the rotor and the cylinder according to the values of the lever dial indicator;

[0016] 8) After the adjustment work is completed, recheck the rotor alignment data. If the rotor alignment data meets the requirements and there is no obvious change in the secondary recheck, the rotor alignment work is completed. If the data is out of tolerance, return to step 7).

[0017] 9) After the rotor alignment is completed, remove the tooling. When removing the tooling, first remove the dial indicator on the lever, loosen the connecting bolts of the hoop, and then the tooling can be easily removed.

[0018] The method of aligning the tooling is simple and convenient for disassembly and assembly, which can provide accurate and reliable construction basis for construction personnel and effectively improve work efficiency and construction quality.

[0019] As an optimal technical means: In step 1), after the bearing housing is aligned and leveled, the rotor first takes the oil baffle hollows of the front and rear bearing housings as the reference to align the rotor with the oil baffle; then, taking the rotor center as the reference, align the cylinder center. When aligning the cylinder center, take the front and rear steam seal hollows or the cylinder measuring ring of the cylinder as the reference and perform alignment according to the data requirements of the manufacturing factory. The selection of the measurement reference is effectively realized.

[0020] As an optimal technical means: In step 2), the installation position of the tooling is selected at the front and rear oil seal sides of the rotor where the sling is placed when lifting the rotor. This position can measure the reference hollows such as the rotor and the front bearing housing oil baffle, the rotor and the front steam seal hollow of the cylinder, the rotor and the rear bearing housing oil baffle, and the rotor and the rear steam seal hollow of the cylinder. Point the pointer of the dial indicator on the lever to the part to be measured, and by rotating the rotor, measure the values of the left, right, upper and lower parts of the measured part respectively. The installation position of the tooling is effectively confirmed.

[0021] As an optimal technical means: Step 3) includes the following steps:

[0022] 301) Install the hoops of the two toolings at the front and rear oil seal sides of the unit;

[0023] 302) After adjusting the hoops, preliminarily tighten the connecting bolts;

[0024] 303) According to the position and space of the measurement part of the unit, select a straight connecting plate or an inclined connecting plate to connect with the gauge position adjusting plate;

[0025] 304) Install the dial indicator on the lever on the gauge position adjusting plate through the gauge clamp, and adjust the gauge clamp and the pointer of the dial indicator on the lever to meet the measurement requirements. The trial installation of the tooling is realized.

[0026] As a preferred technical measure: In step 4), initially tighten the connecting bolts of the tooling, slowly rotate the rotor, and make the pointer of the dial indicator on the tooling slide slowly on the depression or the measuring ring. When sliding, the dial indicator can display the reading normally. Otherwise, the cause should be found out or the dial indicator should be readjusted to meet the measurement requirements. When rotating the rotor, the pointer of the dial indicator should not have sudden jumps or jamming phenomena. If there is a misalignment between the upper and lower cylinders, there will be sudden jumps, and these sudden jumps should be recorded and adjusted in the next process. To check and confirm whether the installation of the tooling meets the requirements of centering measurement.

[0027] As a preferred technical measure: In step 5), after the installation of the tooling meets the requirements of centering measurement, tighten the connecting bolts, lock the dial indicator clamp, and firmly fix the dial indicator. The installation of the rotor centering tooling is completed. To achieve the formal installation of the tooling.

[0028] As a preferred technical measure: Step 6) specifically includes the following steps:

[0029] 601) After the formal installation of the tooling, slowly rotate the rotor and record the readings of the dial indicator. Rotate the rotor two weeks, and there is no obvious change in the data of each part after secondary review. The installation of the tooling meets the measurement requirements;

[0030] 602) The centering measurement is divided into half-cylinder measurement and full-cylinder measurement according to the progress of the steam turbine installation: During half-cylinder measurement, when measuring the lower half oil baffle depression of the bearing pedestal, the lower half steam seal depression of the cylinder or the measuring ring, the tooling is installed at the rotor oil seal part, the measurement points are the oil baffle depression of the bearing pedestal, the lower half steam seal depression of the cylinder or the measuring ring, and the pointer of the dial indicator points to the oil baffle depression of the bearing pedestal, the lower half steam seal depression of the cylinder or the measuring ring. Slowly rotate the rotor back and forth half a week, and measure the left, right and lower values of the oil baffle depression of the bearing pedestal, the lower half steam seal depression of the cylinder or the measuring ring respectively; During full-cylinder measurement, after the upper and lower cylinders are assembled, the tooling is installed at the rotor oil seal part. For the measurement points being the steam seal depression of the cylinder or the cylinder measuring ring, the pointer of the dial indicator points to the steam seal depression or the cylinder measuring ring. By using the rotation of the rotor, measure and record the up and down, left and right upper and lower positions of the steam seal depression or the cylinder measuring ring, a total of 6 values, to achieve the measurement of the center value.

[0031] As a preferred technical measure: In step 7), adjust the steam turbine bearing pedestal or the cylinder according to the measured dial indicator values. After the adjustment is completed, conduct a recheck of centering until the finally measured data meets the requirements; After the upper and lower cylinders are combined, according to the values of the upper left and lower left, upper right and lower right, it can be judged whether there is a misalignment between the upper and lower cylinders after the unit cylinders are combined and whether the combined cylinder is deformed; For the units using the measuring ring technology during cat paw switching, the dial indicator on the tooling can provide intuitive data changes for reference during switching adjustment. Adjust the center of the rotor and the cylinder according to the dial indicator values of the lever.

[0032] Beneficial effects: This tooling can be easily installed on the steam turbine rotor. Slowly rotate the rotor, and by using the rotation of the rotor, measure the relative data of the rotor with respect to the cylinder and the bearing pedestal in the up, down, left, and right directions respectively. This avoids the errors in deflection, calculation, and measurement existing in the conventional measurement method. The measured data is intuitive and accurate. At the same time, the tooling can also be used for intuitive monitoring during the alignment adjustment of the unit. The data changes during the adjustment process are clear at a glance, improving the construction efficiency and accuracy. This tooling has a simple structure, is easy to install and disassemble, has a wide application range, and will not cause damage to the equipment itself during the use process. During the process of finding the center of the steam turbine rotor by rotation, there is a large reading space, the readings are stable, and the measured data is accurate, which can provide accurate and reliable construction basis for construction personnel and greatly improve the work efficiency and construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of the present invention.

[0034] Figure 2 is a schematic flow diagram of the present invention.

[0035] Figure 3 is a schematic installation position diagram of the present invention.

[0036] In the figure: 1, hoop; 2, lever dial indicator; 3, gauge position adjustment plate; 4, connecting bolt; 5, gauge clamp; 6, straight connecting plate; 7, inclined connecting plate; 8, pin; 9, steam turbine rotor; 301, gauge clamp connection hole. DETAILED DESCRIPTION OF THE INVENTION

[0037] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings of the specification.

[0038] As Figure 1 shown, a tooling for finding the center of a steam turbine rotor and the reference sump of the unit includes a hoop 1, a lever dial indicator 2, and a gauge position adjustment plate 3. The hoop 1 is composed of two half-hoops connected by a connecting bolt 4. The lever dial indicator 2 is connected to the gauge position adjustment plate 3 through a gauge clamp 5. The gauge position adjustment plate 3 is connected to the connecting plate arranged on the outer side of the hoop 1 through a connecting bolt 4. The gauge clamp 5 can loosen and clamp the lever dial indicator 2. The connecting plate includes a straight connecting plate 6 and an inclined connecting plate 7. The straight connecting plate 6 and the inclined connecting plate 7 are respectively arranged at the equal division positions of the two half-hoops and are perpendicular to the tangent plane at the connection of the outer circumference of the half-hoop. The straight connecting plate 6 is flush with the hoop 1 in the axial direction of the hoop 1, and the inclined connecting plate 7 has an inclination angle with the end plane of the hoop 1.

[0039] In order to make the measurement more convenient, a plurality of gauge clamp connection holes 301 are arranged in a straight line along the length direction on the gauge position adjustment plate 3. A pin 8 is provided on the gauge clamp 5. The pin 8 passes through the gauge clamp connection hole 301, and the gauge clamp 5 can rotate and be fastened according to the pin 8. According to the measurement needs, the gauge clamp 5 can be installed on different gauge clamp connection holes 301 to make the measurement more convenient.

[0040] As Figure 2 shown, a method for aligning the center of a steam turbine rotor with the reference sump of the unit includes the following steps:

[0041] S1: Select the measurement reference for rotor center alignment;

[0042] S2: Confirm the installation position of the tooling for rotor center alignment, and install the clamp 1 on the steam turbine rotor 9, as Figure 3 shown;

[0043] S3: Trial installation of the tooling for rotor center alignment;

[0044] S4: Check whether the installation of the tooling meets the requirements of center alignment measurement. If not, return to step S3;

[0045] S5: Formal installation of the tooling for rotor center alignment;

[0046] S6: Confirm that the tooling for rotor center alignment meets the requirements and measure the center value. If not, return to step S5;

[0047] S7: Adjust the center of the rotor and the cylinder according to the value of the dial indicator 2;

[0048] S8: After the adjustment work is completed, review the rotor center alignment data. If the rotor center alignment data meets the requirements and there is no obvious change in the secondary review, the rotor center alignment work is completed. If the data exceeds the tolerance, return to step S7;

[0049] S9: After the rotor center alignment is completed, remove the tooling. When removing the tooling, first remove the dial indicator 2 and loosen the connecting bolt 4 of the clamp 1, then the tooling can be easily removed.

[0050] The method of tooling center alignment is simple and convenient for disassembly and assembly, which can provide accurate and reliable construction basis for construction personnel, and effectively improve work efficiency and construction quality.

[0051] To achieve the selection of the measurement reference, in step S1, after the bearing pedestal is aligned and leveled, the rotor first takes the oil baffle sumps of the front and rear bearing pedestals as the reference for rotor center alignment; then takes the rotor center as the reference to find the center of the cylinder. When finding the center of the cylinder, take the front and rear steam seal sumps of the cylinder or the cylinder measurement ring as the reference, and perform center alignment according to the data requirements of the manufacturer. The selection of the measurement reference is effectively achieved.

[0052] To achieve a relatively accurate measurement, in step S2, the installation position of the tooling is selected at the front and rear oil seal sides of the rotor, which are the positions where the sling is placed when lifting the rotor. This position can be used to measure the reference nests such as the oil baffle between the rotor and the front bearing housing, the steam seal pocket between the rotor and the front steam seal of the cylinder, the oil baffle between the rotor and the rear bearing housing, and the steam seal pocket between the rotor and the rear steam seal of the cylinder. Point the pointer of the dial indicator 2 at the part to be measured, and by rotating the rotor, measure the values of the left and right and up and down parts of the measured part respectively. Confirm the installation position of the tooling to achieve a relatively accurate measurement.

[0053] To achieve a trial installation of the tooling, step S3 includes the following steps:

[0054] S301: Install the clamps 1 of the two pieces of tooling at the front and rear oil seal sides of the unit;

[0055] S302: After adjusting the clamp 1, preliminarily tighten the connecting bolts 4;

[0056] S303: According to the position and space of the measurement part of the unit, select a straight connecting plate 6 or an inclined connecting plate 7 to connect with the gauge position adjusting plate 3;

[0057] S304: Install the dial indicator 2 on the gauge position adjusting plate 3 through the gauge clamp 5, and adjust the pointer of the gauge clamp 5 and the dial indicator 2 to meet the measurement requirements. Achieve a trial installation of the tooling.

[0058] To achieve an inspection of the measurement requirements, in step S4, preliminarily tighten the connecting bolts 4 of the tooling, slowly turn the rotor, and make the pointer of the dial indicator 2 on the tooling slide slowly on the pocket or the measurement ring. When sliding, the dial indicator 2 can display the reading normally. Otherwise, the reason should be found out or the dial indicator 2 should be readjusted to meet the measurement requirements. When turning the rotor, the pointer of the dial indicator should not have sudden jumps or jams. If there is a misalignment between the upper and lower cylinders, there will be sudden jumps, and these sudden jumps should be recorded and adjusted in the next process. Achieve an inspection and confirmation of whether the installation of the tooling meets the centering measurement requirements.

[0059] To complete the installation of the tooling, in step S5, after the installation of the tooling meets the centering measurement requirements, tighten the connecting bolts 4, lock the gauge clamp 5, and firmly fix the dial indicator 2. The rotor centering tooling is installed. Achieve the formal installation of the tooling.

[0060] To achieve the measurement of the values at each measurement point, step S6 specifically includes the following steps:

[0061] S601: After the formal installation of the tooling, slowly turn the rotor, record the reading of the dial indicator 2, turn the rotor two weeks, and there is no obvious change in the data of each part after secondary review. The installation of the tooling meets the measurement requirements;

[0062] S602: The center finding measurement is divided into half-cylinder measurement and full-cylinder measurement according to the progress of steam turbine installation. During half-cylinder measurement, when measuring the lower half oil baffle pocket of the bearing pedestal, the lower half steam seal pocket of the cylinder or the measuring ring, the tooling is installed at the rotor oil seal position. The measurement points are the oil baffle pocket of the bearing pedestal, the lower half steam seal pocket of the cylinder or the measuring ring. The pointer of the lever dial indicator 2 points to the oil baffle pocket of the bearing pedestal, the lower half steam seal pocket of the cylinder or the measuring ring. Slowly rotate the rotor back and forth for half a turn, and respectively measure the left, right and lower values of the oil baffle pocket of the bearing pedestal, the lower half steam seal pocket of the cylinder or the measuring ring. During full-cylinder measurement, after the upper and lower cylinders are assembled, the tooling is installed at the rotor oil seal position. The measurement points are the steam seal pocket of the cylinder or the cylinder measuring ring. The pointer of the lever dial indicator 2 points to the steam seal pocket or the cylinder measuring ring. By using the rotation of the rotor, respectively measure and record 6 values of the upper and lower, left and right upper and lower positions of the steam seal pocket or the cylinder measuring ring to achieve the measurement of the center value.

[0063] In order to realize the adjustment of the center of the rotor and the cylinder, in step S7, adjust the steam turbine bearing pedestal or the cylinder according to the measured dial indicator values. After the adjustment is completed, conduct a re-measurement of the center finding until the finally measured data meets the requirements. After the upper and lower cylinders are combined, according to the values of the upper left and lower left, upper right and lower right, it can be judged whether there is misalignment between the upper and lower cylinders after the unit is combined and whether the combined cylinder is deformed. For the units using the measuring ring technology during the cat's paw switching, the dial indicators on the tooling can provide intuitive data changes for reference during the switching adjustment. Adjust the center of the rotor and the cylinder according to the values of the lever dial indicator 2.

[0064] This tooling can be easily installed on the steam turbine rotor 9. By slowly turning the rotor, using the rotation of the rotor, respectively measure the relative data of the upper, lower, left and right between the rotor and the cylinder and the bearing pedestal, avoiding errors such as deflection, calculation and measurement. During the process of finding the center by rotating the steam turbine rotor 9, there is a large reading space, the readings are stable, and the measured data is intuitive and accurate. At the same time, the tooling can also conduct intuitive monitoring during the center finding adjustment of the unit, and the data changes during the adjustment process are clear at a glance, improving the construction efficiency and accuracy. This tooling has a simple structure, is easy to install and disassemble, has a wide application range, and will not cause damage to the equipment itself during the use of the tooling.

[0065] In this example, the two half hoops of the hoop 1 are made of 3×25mm steel strips, and the diameter in the connection direction is 20mm smaller than the diameter in the non-connection direction. When the connection bolt 4 tightens the hoop 1, the distance between the two half hoops is gradually tightened, and the steel strip deforms according to the arc of the rotor until the hoop 1 is tightened.

[0066] In this example, the straight connecting plate 6 and the inclined connecting plate 7 are made of 3×25mm steel strips and are connected to the half hoop by welding.

[0067] In this example, the epitope adjustment plate 3 is made of a steel strip with a thickness of 3 mm. One end is provided with a φ11 screw hole for connection with the straight connection plate 6 or the inclined connection plate 7. The other end is provided with 3 φ6 clip connection holes 301 at equal intervals in the length direction. The epitope adjustment plate 3 includes 2 plates with different lengths and can be selected for use according to measurement needs.

[0068] In this example, the connection bolts 4 for connecting the two hoop clamps 1 are M10×50, and the connection bolts 4 between the connection plate and the epitope adjustment plate 3 are M10×20.

[0069] In this example, the reference centers required by the manufacturer for rotor centering include: the center of the depression between the rotor and the outer end of the front bearing housing, the center of the depression between the rotor and the inner end of the front bearing housing, the center of the measuring ring at the front end of the rotor and the outer cylinder, the center of the steam seal depression at the front end of the rotor and the outer cylinder, the center of the depression between the rotor and the outer end of the rear bearing housing, the center of the depression between the rotor and the inner end of the rear bearing housing, the center of the measuring ring at the rear end of the rotor and the outer cylinder, and the center of the steam seal depression at the rear end of the rotor and the outer cylinder.

[0070] The above Figures 1-3 The above-described tooling and method for finding the center of a steam turbine rotor and the reference depression of the unit are specific embodiments of the present invention, which have already demonstrated the prominent substantive features and remarkable progress of the present invention. Equivalent modifications can be made to its shape, structure, etc. under the inspiration of the present invention according to actual usage needs, and all are within the protection scope of this solution.

Claims

1. A centering tooling for the steam turbine rotor and the unit reference sump, characterized in that: It includes a hoop (1), a lever dial indicator (2) and a gauge position adjustment plate (3). The hoop (1) is composed of two half-hoops connected by a connecting bolt (4). The lever dial indicator (2) is connected to the gauge position adjustment plate (3) through a gauge clamp (5). The gauge position adjustment plate (3) is connected to a connecting plate arranged on the outer side of the hoop (1) through a connecting bolt (4). The gauge clamp (5) can loosen and clamp the lever dial indicator (2). The connecting plate includes a straight connecting plate (6) and an inclined connecting plate (7). The straight connecting plate (6) and the inclined connecting plate (7) are respectively arranged at the equal division positions of the two half-hoops and are perpendicular to the tangent plane at the connection of the outer periphery of the half-hoop. The straight connecting plate (6) is flush with the hoop (1) in the axial direction of the hoop (1), and the inclined connecting plate (7) has an inclination angle with the end plane of the hoop (1). During the trial installation of the centering tooling, install the hoops (1) of the two pieces of tooling on the front and rear oil seal sides of the unit; after adjusting the hoop (1), initially tighten the connecting bolt (4); according to the position and space of the measurement part of the unit, select the straight connecting plate (6) or the inclined connecting plate (7) to connect with the gauge position adjustment plate (3); install the lever dial indicator (2) on the gauge position adjustment plate (3) through the gauge clamp (5), and adjust the pointer of the gauge clamp (5) and the lever dial indicator (2) to meet the measurement requirements.

2. A centering tooling for a steam turbine rotor and a unit reference sump according to claim 1, characterized in that: A plurality of gauge clamp connection holes (301) are arranged in a straight line along the length direction on the gauge position adjustment plate (3). A shaft pin (8) is provided on the gauge clamp (5). The shaft pin (8) passes through the gauge clamp connection hole (301), and the gauge clamp (5) can rotate and be fastened according to the shaft pin (8).

3. A method for aligning the center of a steam turbine rotor with the reference sump of the unit as described in claim 1, characterized in that It includes the following steps: 1) Select the measurement reference for rotor centering; 2) Confirm the installation position of the centering tooling for the rotor; 3) Trial installation of the centering tooling for the rotor; 4) Check whether the installation of the tooling meets the centering measurement requirements. If not, return to step 3); 5) Formal installation of the centering tooling for the rotor; 6) Confirm that the centering tooling for the rotor meets the requirements and measure the center value. If not, return to step 5); 7) Adjust the center of the rotor and the cylinder according to the value of the lever dial indicator (2); 8) After the adjustment work is completed, review the rotor centering data. If the rotor centering data meets the requirements and there is no obvious change in the secondary review, the rotor centering work is completed. If the data exceeds the tolerance, return to step 7); 9) After the rotor centering is completed, remove the tooling. When removing the tooling, first remove the lever dial indicator (2), loosen the connecting bolt (4) of the hoop (1), and then the tooling can be easily removed; Step 3) includes the following steps: 301) Install the hoops (1) of the two pieces of tooling on the front and rear oil seal sides of the unit; 302) After adjusting the hoop (1), initially tighten the connecting bolt (4); 303) According to the position and space of the measurement part of the unit, select the straight connecting plate (6) or the inclined connecting plate (7) to connect with the gauge position adjustment plate (3); 304) Install the lever dial indicator (2) on the gauge position adjustment plate (3) through the gauge clamp (5), and adjust the pointer of the gauge clamp (5) and the lever dial indicator (2) to meet the measurement requirements.

4. A method for aligning the center of a steam turbine rotor with the reference sump of the unit according to claim 3, characterized in that: In step 1), after the bearing housing is aligned and leveled, the rotor first takes the oil baffle hollows of the front and rear bearing housings as the reference to align the center between the rotor and the oil baffle; then, taking the rotor center as the reference, the cylinder center is aligned. When aligning the cylinder center, take the front and rear steam seal hollows of the cylinder or the cylinder measurement ring as the reference and align the center according to the data required by the manufacturer.

5. A method for aligning the center of a steam turbine rotor with the reference sump of the unit according to claim 3, characterized in that: In step 2), the installation position of the tooling is selected at the front and rear oil seal sides of the rotor, which is the place where the sling is placed when lifting the rotor. This position can measure the reference hollows such as the oil baffle between the rotor and the front bearing housing, the front steam seal hollow of the cylinder or the cylinder measurement ring between the rotor and the cylinder, the oil baffle between the rotor and the rear bearing housing, and the rear steam seal or the cylinder measurement ring between the rotor and the cylinder. Point the pointer of the dial indicator (2) at the part to be measured, and by rotating the rotor, measure the left, right, upper and lower values of the measured part respectively.

6. A method for aligning the center of a steam turbine rotor with the reference sump of the unit according to claim 3, characterized in that: In step 4), initially tighten the connecting bolts (4) of the tooling, slowly rotate the rotor, and make the pointer of the dial indicator (2) on the tooling slide slowly on the hollow or the measurement ring. When sliding, the dial indicator (2) can display the reading normally. Otherwise, find out the reason or readjust the dial indicator (2) to meet the measurement requirements. When rotating the rotor, the pointer of the dial indicator should not have sudden jumps or jams. If there is a sudden jump when the upper and lower cylinders are misaligned, this sudden jump should be recorded and adjusted in the next process.

7. A method for aligning the center of a steam turbine rotor with the reference sump of the unit according to claim 3, characterized in that: In step 5), after the tooling installation meets the alignment measurement requirements, tighten the connecting bolts (4), lock the gauge clamp (5), and firmly fix the dial indicator (2). The installation of the rotor alignment tooling is completed.

8. A method for aligning the center of a steam turbine rotor with the reference sump of a unit according to claim 3, characterized in that: Step 6) specifically includes the following steps: 601) After the tooling is officially installed, slowly rotate the rotor and record the readings of the dial indicator (2). Rotate the rotor two weeks, and the data of each part is rechecked twice without obvious changes, indicating that the tooling installation meets the measurement requirements. 602) The alignment measurement is divided into half-cylinder measurement and full-cylinder measurement according to the progress of the steam turbine installation: During the half-cylinder measurement, when measuring the lower half oil baffle hollow of the bearing housing, the lower half steam seal hollow of the cylinder or the measurement ring, the tooling is installed at the oil seal part of the rotor, and the measurement points are the oil baffle hollow of the bearing housing, the lower half steam seal hollow of the cylinder or the measurement ring. Point the pointer of the dial indicator (2) at the oil baffle hollow of the bearing housing, the lower half steam seal hollow of the cylinder or the measurement ring, and slowly rotate the rotor back and forth for half a week to measure the left, right, upper and lower values of the oil baffle hollow of the bearing housing and the lower half steam seal hollow of the cylinder respectively; During the full-cylinder measurement, after the upper and lower cylinders are assembled, the tooling is installed at the oil seal part of the rotor. For the measurement points, they are the steam seal hollow of the cylinder or the cylinder measurement ring. Point the pointer of the dial indicator (2) at the steam seal hollow or the cylinder measurement ring, and by rotating the rotor, measure and record a total of 6 values including the upper and lower positions of the steam seal hollow, the left and right upper and lower positions of the cylinder respectively.

9. A method for aligning the center of a steam turbine rotor with the reference sump of the unit according to claim 3, characterized in that: In step 7), adjust the steam turbine bearing housing or the cylinder according to the measured dial indicator values. After the adjustment, conduct a recheck of the alignment until the finally measured data meets the requirements; After the upper and lower cylinders are combined, according to the values of the upper left and lower left, upper right and lower right, it can be judged whether there is misalignment between the upper and lower cylinders after the unit cylinders are combined and whether the combined cylinder is deformed; For the units using the measurement ring technology during the cat's paw switching, the dial indicator on the tooling can provide intuitive data changes for reference during the switching adjustment.

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