Low pressure turbine rotor-stator assembly measurement device and measurement method

Abstract

This invention provides a low-pressure turbine rotor-stator assembly and measurement device, including a support frame, a hollow CNC air-bearing turntable, a measuring instrument frame, a rotor-stator housing fixture, a lifting drive assembly, and a control system. The lifting drive assembly and control system are mounted to the support frame. The hollow CNC air-bearing turntable is mounted on the lifting platform of the lifting drive assembly, which drives the hollow CNC air-bearing turntable to move up and down. The rotor-stator housing fixture is set on the hollow CNC air-bearing turntable and is used to place the rotor and stator. The measuring instrument frame is mounted on both sides of the lifting platform and is used to measure the upper and lower ends of the rotor-stator. This invention improves the assembly accuracy and consistency of key components of aero-engines while significantly increasing production efficiency and reducing overall costs, demonstrating significant technical and economic benefits and strategic value.

Description

Technical Field

[0001] This invention belongs to the field of high-precision rotating machinery, and in particular relates to a measuring device and method for assembling low-pressure turbine rotor and stator. Background Technology

[0002] In the manufacturing and assembly of high-precision rotating machinery such as aero engines, the assembly accuracy of rotor-stator components directly determines the final performance and reliability of the product. Traditional assembly processes typically employ a step-by-step approach: "assemble first, measure later, adjust later." This means that after initial assembly at the assembly station, components are hoisted to a coordinate measuring machine (CMM) or other specialized testing equipment for measurement of form and position tolerances (such as coaxiality, roundness, and perpendicularity). Based on the measurement results, the components are then returned to the assembly station for repeated adjustments and corrections. This "assembly and measurement separation" model has significant drawbacks: First, components are prone to micro-deformation or loss of reference points during hoisting and transportation due to stress or temperature changes, leading to discrepancies between measurement results and the actual assembly state, introducing secondary errors. Second, the process is cumbersome, with repeated hoisting and positioning consuming significant time and manpower, resulting in low assembly efficiency. Finally, it is highly dependent on measuring equipment, and most high-precision measuring equipment is dedicated to specific applications, lacking flexibility.

[0003] For high-precision rotor stacking assembly, the domestic high-end market has long relied on imported optimization assembly equipment, which has hindered the independent development of my country's high-end equipment manufacturing industry, such as aero-engines. In addition, existing domestic measurement equipment often has relatively single functions and cannot meet the two core process requirements of "unit assembly measurement" and "rotor stacking optimization assembly" on the same equipment. Users need to purchase multiple pieces of equipment, which increases equipment investment and site occupancy costs.

[0004] Therefore, the industry urgently needs to develop an integrated assembly and measurement solution that combines high-precision assembly, online measurement, and intelligent optimization. This solution would enable the entire process—from component assembly, real-time measurement, data calculation to optimization and adjustment—to be completed on the same equipment and under the same clamping conditions. This would fundamentally ensure the uniformity of assembly benchmarks and the real-time nature of measurement data, improve assembly accuracy and efficiency, and break the foreign technology monopoly. Summary of the Invention

[0005] In view of this, the present invention aims to propose a low-pressure turbine stator assembly measurement device and measurement method, which improves the assembly accuracy and consistency of key components of aero-engines, while significantly increasing production efficiency and reducing overall costs, and has significant technical and economic benefits and strategic value.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows: The low-pressure turbine rotor-stator assembly measuring device includes a support frame, a hollow CNC air-floating turntable, a measuring instrument frame, rotor-stator housing tooling, a lifting drive assembly, and a control system. The lifting drive assembly and control system are installed on the support frame, and the hollow CNC air-floating turntable is installed on the lifting platform of the lifting drive assembly. The lifting drive assembly is used to drive the hollow CNC air-floating turntable to lift. The rotor-stator housing fixture is set on a hollow CNC air-floating turntable and is used to place the rotor and stator. The measuring instrument frame is installed on both sides of the lifting platform, and is used to measure the upper and lower ends of the stator.

[0007] Furthermore, the front end of the measuring instrument frame is equipped with a clamping contact sensor, which, together with the air-float turntable, can realize the measurement of rotor runout. A universal gauge holder is also provided above the measuring instrument holder for measurement during the assembly of the rotor and stator; a universal gauge holder is also provided below for measurement after the rotor and stator are assembled.

[0008] Furthermore, the hollow CNC air-floating turntable has a ring structure, and the lifting platform is also provided with through holes, both for the passage of the rotor's central shaft.

[0009] The measurement method of the low-pressure turbine rotor-stator assembly measuring device includes the following steps: The component to be assembled is installed on an adjustable assembly platform; during the assembly process, a measuring device is used to obtain the radial runout and / or axial runout measurement values ​​of at least one measuring position on the component to be assembled; based on the runout measurement values, the form and position tolerance deviation of the component to be assembled relative to the datum is calculated in real time; and based on the calculated form and position tolerance deviation, the assembly adjustment of the component to be assembled or the optimization of the assembly of subsequent components is performed.

[0010] Furthermore, the steps for calculating form and position tolerance deviations in real time based on runout measurements include: S1. The process of unit assembly and high-precision measurement equipment service: Before installing the stator, first lower the lifting platform on the equipment to a height suitable for personnel to operate, then install the first-stage rotor and align the first-stage rotor. S2. Install the stator casing, and then use the two sets of universal measuring instruments at the bottom to measure the radial and axial runout of the first-stage rotor. Calculate and record the eccentricity, eccentricity angle, and roundness from the runout data. S3. After the first-stage rotor measurement is completed, the second-stage rotor is installed step by step, and then the second-stage rotor is locked. Then, the radial and axial runout of the second-stage rotor measurement surface is measured using the two universal measuring instruments on the upper part. The perpendicularity, perpendicular angle, coaxiality, coaxial angle and other data are calculated and recorded using the first-stage reference data and the second-stage runout data. S4. When installing the cone wall assembly, ensure that the lifting platform is raised to a position where the operator can stand and operate. Due to the special structure, when tightening the cone wall assembly bolts, personnel must use a special wrench to tighten the bolts from the bottom up. S5. After the cone wall assembly is installed, the lifting platform is lowered to a height suitable for personnel to operate. Then, the cone wall assembly is measured. The measurement method and calculation method are the same as those in S2 and S3. S6. Continue installing the third-stage rotor in this state. The rotor measurement scheme is the same as S2 and S3. Then lock the third-stage rotor. S7. After the above operations, the rotor-stator assembly is installed. Loosen the locking bolts between the first-stage rotor and the rotor revolution. At this time, the rotor-stator assembly needs to be hoisted to the side of the equipment first, and the rotor shaft of the last assembly is prepared. S8. Raise the lifting platform to the rotor shaft installation position, then hoist the rotor shaft onto the equipment, align it with the reference hole at the bottom of the equipment, and slowly lower the rotor shaft. After it is in place, install the rotor shaft auxiliary support at the bottom of the lifting platform to ensure that the rotor shaft is placed stably. S9. Then, install the assembled rotor-stator assembly together with the rotor shaft, and retract the rotor shaft auxiliary support. S10. Raise the lifting platform slightly until the rotor central shaft reference is fully exposed. Then use the sensor to simultaneously measure the primary rotor reference and the rotor central shaft reference to verify the final assembly data, i.e., coaxiality. The calculation method is the same as S2 and S3. Furthermore, in step S2, Calculate the center coordinates X and Y (R: jump data, θ: corresponding R jump data angle): Coordinate X: ; Coordinate Y: ; Least square radius r k : ; b. Based on the center coordinates, eccentricity, and eccentricity angle: Eccentricity E: ; Eccentric angle ϕ: ; c-roundness calculation formula: Roundness R LSC : .

[0011] Furthermore, in step S3, a. Calculate perpendicularity A and coaxiality B: ; b. Calculate the perpendicular angle and the coaxial angle: ; c. Calculate the perpendicularity coordinate X C YC (X) c Y c :Measure the X and Y axis coordinates, E J : Reference eccentricity E c :Measure the eccentricity, H J Reference height, H C (Measurement position height): ; ; d. Calculate the coaxiality coordinate X. T Y T (X) T Y T :Measure the X and Y axis coordinates, E J Reference eccentricity Ec: Measured eccentricity, H J Reference height, H C : Measurement position height, D C : Measurement position diameter, D J (Reference diameter): ; .

[0012] Compared with existing technologies, the low-pressure turbine rotor-stator assembly measuring device and measuring method described in this invention have the following advantages: (1) The low-pressure turbine stator assembly measurement device and measurement method described in this invention integrates assembly and high-precision measurement functions into the same equipment and under the same clamping state through the "assembly and measurement integration" design. This avoids the loss of reference, micro-deformation and secondary errors caused by repeated hoisting of parts between the assembly station and the measurement equipment in the traditional process. It fundamentally ensures that the measurement data truly reflects the assembly state, thereby ensuring that the coaxiality, perpendicularity and other key form and position tolerances of the final assembly reach extremely high precision.

[0013] (2) The low-pressure turbine rotor-stator assembly measurement device and method described in this invention can measure the runout, roundness, and other data of each component (such as rotor and stator casing) in real time during the assembly process, and calculate parameters such as eccentricity and coaxiality in real time through dedicated software. Based on these real-time data, on-site adjustments can be guided or the optimal circumferential installation phase can be given through optimization algorithms (such as calculating "optimized value S and optimized angle φS"), thereby realizing closed-loop control and optimization of the assembly process and transforming post-event detection and adjustment into in-process control.

[0014] (3) The low-pressure turbine rotor-stator assembly measurement device and method described in this invention innovatively integrates two core functions: "overall rotor-stator assembly measurement" and "rotor stacking optimization assembly". It can meet the overall assembly and final verification of unit bodies (such as low-pressure turbine rotor-stator components), and can also be used for the step-by-step stacking and optimization assembly of multi-stage rotors. This integrated design improves the versatility and utilization of the equipment and meets the multi-stage process requirements of complex products. The equipment is equipped with a lifting platform, a universal measuring table, a cantilever control system, etc., which makes it more convenient to perform assembly operations and measurement settings at different heights, reduces the labor intensity of operators, and improves the convenience and safety of operation. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the low-pressure turbine rotor-stator assembly and measuring device according to an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Support frame; 2. Hollow CNC air-bearing turntable; 3. Measuring instrument stand; 4. Rotary stator housing fixture; 5. Lifting drive assembly. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] The low-pressure turbine rotor-stator assembly measuring device, as shown in Figure 1, includes a support frame 1, a hollow CNC air-floating turntable 2, a measuring instrument frame 3, a rotor-stator housing tooling 4, a lifting drive assembly 5, and a control system. The lifting drive assembly 5 and the control system are installed on the support frame 1, and the hollow CNC air-floating turntable 2 is installed on the lifting platform of the lifting drive assembly 5. The lifting drive assembly 5 is used to drive the hollow CNC air-floating turntable 2 to lift. The rotor-stator housing tooling 4 is set on the hollow CNC air-floating turntable 2 and is used to place the rotor and stator; The measuring instrument frame 3 is installed on both sides of the lifting platform, and the measuring instrument frame 3 is used to measure the upper and lower ends of the rotor.

[0022] Furthermore, the front end of the measuring instrument frame 3 is equipped with a clamping contact sensor, which, in conjunction with the air-float turntable, can realize the measurement of rotor runout. A universal gauge frame is also provided above the measuring instrument frame 3 for measurement during the assembly of the rotor and stator; a universal gauge frame is also provided below for measurement after the rotor and stator are assembled.

[0023] Furthermore, the hollow CNC air-floating turntable 2 has a ring structure, and the lifting platform is also provided with through holes, both for the passage of the rotor shaft.

[0024] The support frame is the main load-bearing structure of the equipment. It has advantages such as high rigidity, sturdiness, large load-bearing capacity, and convenient processing and installation. The bottom has a large base, which increases the contact area with the support surface, lowers the center of gravity, and improves the anti-overturning ability. At the same time, there is also a diagonal bracing structure, which can effectively reduce the horizontal force and enhance the overall stability. The existing equipment uses our company's independently developed ZT-AB-D800-ZK large hollow CNC air-floating rotary table, which can identify customer needs. Key precision is reflected in the axial and radial motion accuracy of the rotary table. Our high-precision air-floating rotary tables can achieve axial motion accuracy of over 0.1μm, radial motion accuracy of over 0.1μm, and angular swing accuracy of over 0.2″. Our company has been developing and producing high-precision air-floating rotary tables for many years, solving the problems of poor temperature and environmental adaptability, and achieving load-bearing capacity and large load margin. The air source filtration system is equipped with a regenerable long-lasting filtration system, allowing the air-floating rotary table to be used for a long time while maintaining its precision. The worktable rotates without noise or frictional vibration, and its rotation and tilting are smooth. The air-floating turntable adopts an air-floating structure. During operation, the bearings are filled with gas to form an air film structure, resulting in no frictional vibration and no noise during operation. The worktable rotation is automatic: the turntable is a hollow CNC air-bearing turntable, which can rotate automatically or manually. In automatic rotation control mode, the turntable can automatically rotate for indexing and positioning. Without automatic rotation control, the turntable can be rotated manually. The air-bearing turntable is equipped with an optical grating and reading head, which can transmit signals to the control cabinet to achieve indexing and positioning functions. The air-bearing turntable is ventilated by an external air source to achieve air buoyancy support on the table surface. The turntable control box is equipped with a pressure switch. When the air pressure of the air-bearing turntable drops below the set air pressure value or exceeds the set maximum air pressure value, the pressure switch outputs a signal, and the control system automatically controls the motor to stop rotating. The air bearing is connected to the drive motor. The automatic rotation and locking of the turntable are achieved by controlling the start and stop of the motor. After the motor is enabled for locking, the table surface connected to the air bearing is also locked and fixed. Introducing gas can run the motor and control the rotation of the turntable table surface.

[0025] Load capacity: 10000N.

[0026] The standard rotary table can rotate continuously, with a maximum speed of 10 rpm.

[0027] It can achieve a turntable end flatness of ≤0.005mm.

[0028] The turntable is equipped with a DC torque motor, directly connected without couplings, and uses a high-precision absolute value circular grating and a high-quality mainstream drive controller. It can achieve forward and reverse rotation, and stop locking. After locking, the turntable's reverse torque is ≥4000 N.m. The motor can also be easily rotated manually without being enabled (the air-bearing turntable has no friction).

[0029] The air flotation turntable is dustproofed, preventing external metal dust from entering its interior. During use, pressurized air is blown outwards to avoid damage to the equipment from metal dust.

[0030] The lifting drive assembly is implemented using a lead screw and is a commercially available component. The stator housing fixture is a detachable fixture, which can be easily replaced when measuring different models later. The stator housing fixture is installed on the outside of the hollow CNC air-bearing turntable and on the lifting platform. The bottom of the fixture is equipped with a 6mm micro-stroke lifting system to realize the lifting and lowering of the stator housing during the assembly of the stator. The fixture is also a detachable fixture, which can be easily replaced when measuring different models later. Clamping contact sensors can measure the runout of the end face and inner and outer circles of parts. The sensors themselves have a data interface and can communicate with the control system. The measurement method of the low-pressure turbine rotor-stator assembly measuring device includes the following steps: The component to be assembled is installed on an adjustable assembly platform; during the assembly process, a measuring device is used to obtain the radial runout and / or axial runout measurement values ​​of at least one measuring position on the component to be assembled; based on the runout measurement values, the form and position tolerance deviation of the component to be assembled relative to the datum is calculated in real time; and based on the calculated form and position tolerance deviation, the assembly adjustment of the component to be assembled or the optimization of the assembly of subsequent components is performed.

[0031] Furthermore, the steps for calculating form and position tolerance deviations in real time based on runout measurements include: S1. The process of unit assembly and high-precision measurement equipment service: Before installing the stator, first lower the lifting platform on the equipment to a height suitable for personnel to operate, then install the first-stage rotor and align the first-stage rotor. S2. Install the stator casing, and then use the two sets of universal measuring instruments at the bottom to measure the radial and axial runout of the first-stage rotor. Calculate and record the eccentricity, eccentricity angle, and roundness from the runout data. S3. After the first-stage rotor measurement is completed, the second-stage rotor is installed step by step, and then the second-stage rotor is locked. Then, the radial and axial runout of the second-stage rotor measurement surface is measured using the two universal measuring instruments on the upper part. The perpendicularity, perpendicular angle, coaxiality, coaxial angle and other data are calculated and recorded using the first-stage reference data and the second-stage runout data. S4. When installing the cone wall assembly, ensure that the lifting platform is raised to a position where the operator can stand and operate. Due to the special structure, when tightening the cone wall assembly bolts, personnel must use a special wrench to tighten the bolts from the bottom up. S5. After the cone wall assembly is installed, the lifting platform is lowered to a height suitable for personnel to operate. Then, the cone wall assembly is measured. The measurement method and calculation method are the same as those in S2 and S3. S6. Continue installing the third-stage rotor in this state. The rotor measurement scheme is the same as S2 and S3. Then lock the third-stage rotor. S7. After the above operations, the rotor-stator assembly is installed. Loosen the locking bolts between the first-stage rotor and the rotor revolution. At this time, the rotor-stator assembly needs to be hoisted to the side of the equipment first, and the rotor shaft of the last assembly is prepared. S8. Raise the lifting platform to the rotor shaft installation position, then hoist the rotor shaft onto the equipment, align it with the reference hole at the bottom of the equipment, and slowly lower the rotor shaft. After it is in place, install the rotor shaft auxiliary support at the bottom of the lifting platform to ensure that the rotor shaft is placed stably. S9. Then, install the assembled rotor-stator assembly together with the rotor shaft, and retract the rotor shaft auxiliary support. S10. Raise the lifting platform slightly until the rotor central shaft reference is fully exposed. Then use the sensor to simultaneously measure the primary rotor reference and the rotor central shaft reference to verify the final assembly data, i.e., coaxiality. The calculation method is the same as S2 and S3. Furthermore, in step S2, Calculate the center coordinates X and Y (R: jump data, θ: corresponding R jump data angle): Coordinate X: ; Coordinate Y: ; Least square radius r k : ; b. Based on the center coordinates, eccentricity, and eccentricity angle: Eccentricity E: ; Eccentric angle ϕ: ; c-roundness calculation formula: Roundness R LSC : .

[0032] Furthermore, in step S3, a. Calculate perpendicularity A and coaxiality B: ; b. Calculate the perpendicular angle and the coaxial angle: ; c. Calculate the perpendicularity coordinate X C Y C (X) c Y c :Measure the X and Y axis coordinates, E J : Reference eccentricity E c :Measure the eccentricity, H J Reference height, H C (Measurement position height): ; ; d. Calculate the coaxiality coordinate X. T Y T (X) T Y T :Measure the X and Y axis coordinates, E J Reference eccentricity Ec: Measured eccentricity, H J Reference height, H C : Measurement position height, D C : Measurement position diameter, D J (Reference diameter): ; .

[0033] This equipment is suitable for optimized measurement of single-stage and multi-stage rotor stacks; When performing optimized assembly measurement of a single-stage rotor, four sets of measuring sensors are required simultaneously. Two sets are used for benchmark positioning measurement, and the other two sets are used for positioning surface measurement. By combining the measurement data from the measuring sensors with software calculations, the single-stage rotor runout, concentricity, roundness, perpendicularity, parallelism, flatness, SP value, and corresponding angle value can be calculated.

[0034] When performing multi-stage rotor optimization assembly measurement, the measurement steps are the same as in S2. Then, multi-layer assembly is performed using the corresponding optimization values. After the assembly is completed, the measurement data of the last layer is measured using a measurement sensor to verify the final optimized assembly result. Single-stage rotor optimized assembly calculation (H N (This refers to the total height of the corresponding rotor). Optimized value S: ; Optimize angle ϕ S : .

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-pressure turbine rotor-stator assembly measuring device, characterized in that: Includes a support frame, a hollow CNC air-bearing turntable, a measuring instrument frame, a rotor-stator housing tooling, a lifting drive assembly, and a control system; The lifting drive assembly and control system are installed on the support frame, and the hollow CNC air-floating turntable is installed on the lifting platform of the lifting drive assembly. The lifting drive assembly is used to drive the hollow CNC air-floating turntable to lift. The rotor-stator housing fixture is set on a hollow CNC air-floating turntable and is used to place the rotor and stator. The measuring instrument frame is installed on both sides of the lifting platform, and is used to measure the upper and lower ends of the stator.

2. The low-pressure turbine rotor-stator assembly measuring device according to claim 1, characterized in that: The front end of the measuring instrument stand is equipped with a clamping contact sensor, which, together with the air-float turntable, can realize the measurement of rotor runout; A universal gauge holder is also provided above the measuring instrument holder for measurement during the assembly of the rotor and stator; a universal gauge holder is also provided below for measurement after the rotor and stator are assembled.

3. The low-pressure turbine rotor-stator assembly measuring device according to claim 1, characterized in that: The hollow CNC air-floating turntable has a ring structure, and the lifting platform is also provided with through holes, both for the passage of the rotor shaft.

4. The measurement method of the low-pressure turbine rotor-stator assembly measuring device according to claims 1-3, characterized in that: Includes the following steps: Install the components to be assembled onto the adjustable assembly platform; During the assembly process, a measuring device is used to obtain the radial runout and / or axial runout measurement values ​​of at least one measuring position on the component to be assembled; based on the runout measurement values, the form and position tolerance deviation of the component to be assembled relative to the datum is calculated in real time. Based on the calculated geometric tolerance deviations, the assembly adjustment of the component to be assembled or the optimization of the assembly of subsequent components are performed.

5. The low-pressure turbine rotor-stator assembly measurement method according to claim 4, characterized in that: The steps for real-time calculation of form and position tolerance deviations based on runout measurements include: S1. The process of unit assembly and high-precision measurement equipment service: Before installing the stator, first lower the lifting platform on the equipment to a height suitable for personnel to operate, then install the first-stage rotor and align the first-stage rotor. S2. Install the stator casing, and then use the two sets of universal measuring instruments at the bottom to measure the radial and axial runout of the first-stage rotor. Calculate and record the eccentricity, eccentricity angle, and roundness from the runout data. S3. After the first-stage rotor measurement is completed, the second-stage rotor is installed step by step, and then the second-stage rotor is locked. Then, the radial and axial runout of the second-stage rotor measurement surface is measured using the two universal measuring instruments on the upper part. The perpendicularity, perpendicular angle, coaxiality, coaxial angle and other data are calculated and recorded using the first-stage reference data and the second-stage runout data. S4. When installing the cone wall assembly, ensure that the lifting platform is raised to a position where the operator can stand and operate. Due to the special structure, when tightening the cone wall assembly bolts, personnel must use a special wrench to tighten the bolts from the bottom up. S5. After the cone wall assembly is installed, the lifting platform is lowered to a height suitable for personnel to operate. Then, the cone wall assembly is measured. The measurement method and calculation method are the same as those in S2 and S3. S6. Continue installing the third-stage rotor in this state. The rotor measurement scheme is the same as S2 and S3. Then lock the third-stage rotor. S7. After the above operations, the rotor-stator assembly is installed. Loosen the locking bolts between the first-stage rotor and the rotor revolution. At this time, the rotor-stator assembly needs to be hoisted to the side of the equipment first, and the rotor shaft of the last assembly is prepared. S8. Raise the lifting platform to the rotor shaft installation position, then hoist the rotor shaft onto the equipment, align it with the reference hole at the bottom of the equipment, and slowly lower the rotor shaft. After it is in place, install the rotor shaft auxiliary support at the bottom of the lifting platform to ensure that the rotor shaft is placed stably. S9. Then, install the assembled rotor-stator assembly together with the rotor shaft, and retract the rotor shaft auxiliary support. S10. Raise the lifting platform slightly until the rotor central axis reference is fully exposed. Then, use sensors to simultaneously measure the primary rotor reference and the rotor central axis reference to verify the final assembly data, i.e., coaxiality. The calculation method is the same as S2 and S3.

6. The low-pressure turbine rotor-stator assembly measurement method according to claim 5, characterized in that: In step S2, Calculate the center coordinates X and Y (R: jump data, θ: corresponding R jump data angle): Coordinate X: ; Coordinate Y: ; Least square radius r k : ; b. Based on the center coordinates, eccentricity, and eccentricity angle: Eccentricity E: ; Eccentric angle ϕ: ; c-roundness calculation formula: Roundness R LSC : .

7. The low-pressure turbine rotor-stator assembly measurement method according to claim 5, characterized in that: In step S3, a. Calculate perpendicularity A and coaxiality B: ; b. Calculate the perpendicular angle and the coaxial angle: ; c. Calculate the perpendicularity coordinate X C , Y C (X c , Y c : Measure the X and Y axis coordinates, E J : Reference eccentricity E c : Measured eccentricity, H J : Reference height, H C : Measured height): ； ； d. Calculate the coaxiality coordinate X. T Y T (X) T Y T :Measure the X and Y axis coordinates, E J Reference eccentricity Ec: Measured eccentricity, H J Reference height, H C : Measurement position height, D C : Measurement position diameter, D J (Reference diameter): ； 。

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