CN109458232B - Method for measuring cylinder partition plate hollow pit and concentricity of leaf top steam-resistant sheet thereof - Google Patents
Method for measuring cylinder partition plate hollow pit and concentricity of leaf top steam-resistant sheet thereof Download PDFInfo
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- CN109458232B CN109458232B CN201811558144.3A CN201811558144A CN109458232B CN 109458232 B CN109458232 B CN 109458232B CN 201811558144 A CN201811558144 A CN 201811558144A CN 109458232 B CN109458232 B CN 109458232B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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Abstract
The invention relates to a method for measuring the concentricity of a hollow nest and a blade top steam-resistant sheet of a cylinder partition plate, which uses a laser tracking measurement system to carry out measurement according to the following steps: step S1: measuring and recording temperature data of the same metal as the partition plate material in the current environment by using the temperature probe, and measuring and recording position data of each space point of the depression of the partition plate and the tooth tips of the leaf top steam-resistant sheets thereof by using the laser tracker; step S2: and fitting the partition plate hollow cavity through the position data by using the user terminal, creating a center line of the partition plate hollow cavity, fitting the vertical distance from each space point of the tooth tips of the steam-resistant sheets on the top of the partition plate to the center line of the partition plate hollow cavity, and evaluating the concentricity of the partition plate hollow cavity and the steam-resistant sheets on the top of the partition plate through the vertical distance. The method enhances the understanding of the through-flow condition of the turbine unit and further improves the reliability and safety of the operation of the unit.
Description
Technical Field
The invention relates to the field of measurement of steam turbines, in particular to a method for measuring hollows of a cylinder partition plate and concentricity of a blade top steam-resistant sheet of the cylinder partition plate by a laser tracker measuring system.
Background
In recent years, with the increasing of the national strength on energy conservation and emission reduction and the rapid development of the nuclear power industry, the requirements of thermal power enterprises on the power generation efficiency are higher and higher, and the safety requirements of the nuclear power enterprises on the unit operation are higher and higher. Therefore, for turbine maintenance, measurement and adjustment of the turbine flow through parts are an important factor affecting the power generation efficiency and safe operation of the unit.
At present, in the process of measuring radial through-flow of the tops of moving and static blades of a steam turbine, through-flow gaps which are only used for measuring four positions of the top, the bottom, the left and the right in the radial direction are adopted to represent the through-flow state of the whole circumference, and the gap conditions of other positions of the circumference are not measured. And the measurement mode is relatively backward, the left and right sides adopt a feeler gauge for measurement, and the upper and lower sides adopt lead pressing wires or adhesive-coated cloth for measurement.
Therefore, how to know the flow state of the tip clearance more truly, quickly and conveniently and to evaluate the efficiency and safety of the unit more accurately is an important subject at present.
In order to solve the problem, the invention provides a method for measuring the concentricity of a steam-resistant sheet at the top of a partition plate and a hollow nest of the partition plate by using a laser measurement technology, and aims to more comprehensively and accurately know the through-flow condition of the top part of a turbine blade, thereby improving the efficiency of a unit and enhancing the operation safety of the unit.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for measuring the concentricity of a hollow nest and a blade top steam-resistant sheet of a cylinder partition plate;
the technical scheme adopted by the invention for solving the technical problems is as follows: a method for measuring concentricity of a hollow nest of a cylinder partition plate and a steam-blocking piece at the top of the hollow nest of the cylinder partition plate uses a laser tracking measuring system to carry out measurement, the laser tracking measuring system comprises a user terminal, a laser tracker and a reference target ball seat, the laser tracker is connected with the user terminal, the laser tracker is provided with a temperature probe, and the measurement is carried out according to the following steps:
step S1: measuring and recording temperature data of the same metal as the partition plate material in the current environment by using the temperature probe, and measuring and recording position data of each space point of the depression of the partition plate and the tooth tips of the leaf top steam-resistant sheets thereof by using the laser tracker;
step S2: and fitting the partition plate hollow cavity through the position data by using the user terminal, creating a center line of the partition plate hollow cavity, fitting the vertical distance from each space point of the tooth tips of the steam-resistant sheets on the top of the partition plate to the center line of the partition plate hollow cavity, and evaluating the concentricity of the partition plate hollow cavity and the steam-resistant sheets on the top of the partition plate through the vertical distance.
Preferably, the step S1 further includes:
step S11: disassembling the cylinder, and lifting the upper half cylinder, the upper partition plate and the rotor to a specific maintenance area to enable the cylinder to be in a state that the lower partition plate is not lifted; subsequently, disassembling all steam seal blocks of the upper partition plate and the lower partition plate;
step S12: the laser tracker is conveyed to a lower half cylinder overhaul area, and a power supply is switched on for preheating; and simultaneously, selecting one of the lower partition plates as a measured lower partition plate, fastening the laser tracker fixing support on the hollow nest of the adjacent one of the lower partition plates to be measured, and ensuring that the laser tracker simultaneously detects the hollow nest of the lower partition plate to be measured and the leaf top steam-resistant sheet thereof.
Step S13: after the preheating work of the laser tracker is finished, the user terminal is used for calibrating parameters;
step S14: fixing the laser tracker on the erected fixed support, and enabling the measuring head to face downwards;
step S15: and measuring and recording temperature data of the same metal as the measured lower partition plate material in the current environment by using the temperature probe, and measuring and recording position data of each space point of the depression of the measured lower partition plate and the tooth tips of the leaf top steam-resistant sheets by using the laser tracker.
Preferably, the step S15 further includes
Step S151: measuring and recording initial temperature data of the same metal material as the measured lower partition plate in the current environment by using the temperature probe;
step S152: measuring and recording position data of at least 6 points of the measured lower partition plate dimple surface in the circumferential direction using the user terminal;
step S153: measuring and recording the position data of the space points of the tooth tips of the steam-resistant sheet at the top of the measured lower partition plate blade in different directions in the circumferential direction by using the user terminal;
step S154: and the temperature probe measures and records the final temperature data of the same metal material as the measured lower partition plate in the current environment.
Preferably, the test number and the test orientation of the spatial points in the step S153 are determined according to the size of the partition board under test and the operation condition of the cylinder assembly.
Preferably, the step S2 further includes:
step S21: using the user terminal to perform temperature compensation on the initial temperature data and the final temperature data;
step S22: fitting the measured lower clapboard dimpled by using the user terminal and taking a cylinder as a characteristic body, and performing noise reduction processing on the coordinates in the cylinder; establishing circle centers of the upper bottom surface and the lower bottom surface of the cylinder as key points, connecting the circle centers with a straight line to serve as central lines of the dimples of the lower partition plate to be measured, establishing a space coordinate system by taking one of the circle centers as an original point, taking the central line of the dimples of the lower partition plate to be measured as an X axis and taking the central line of the dimples of the lower partition plate to be measured vertically upwards as a Z axis;
step S23: and fitting the vertical distance from each space point of the tooth tip of the steam-resistant sheet at the top of the lower partition plate to the central line of the hollow cavity of the lower partition plate to be measured by using the user terminal, and evaluating the concentricity of the hollow cavity of the lower partition plate to be measured and the steam-resistant sheet at the top of the lower partition plate to be measured through the vertical distance.
Preferably, the step S2 further includes:
step S24: and repeating the steps S151-S154 and the steps S21-S23, measuring and fitting the vertical distances from all measurable space points on the tooth tips of the steam-resistant sheet at the top of the lower partition plate to the central lines of the respective dimples one by one, and evaluating the concentricity of the steam-resistant sheet at the top of the lower partition plate and the respective dimples according to the vertical distances.
Preferably, the step S1 further includes:
step S16: and after the lower partition plate measurement work is finished, the laser tracker is conveyed to an upper partition plate overhaul area of the cylinder, and the concentricity of the depression of the upper partition plate and the steam-blocking sheets on the tops of the depression of the upper partition plate is measured.
Preferably, the step S2 further includes:
step S25: and (4) measuring and fitting the vertical distances from all space points on the measured tooth tips of the steam-resistant sheets on the top of the upper partition plate to the central lines of the dimples one by one on the basis of the step S24, and evaluating the concentricity of the dimples of the upper partition plate and the steam-resistant sheets on the top of the upper partition plate according to the vertical distances.
Preferably, the step S1 includes:
step S101: disassembling the cylinder and keeping the lower partition plate in the cylinder body of the cylinder;
step S102: preheating the laser tracker; after the preheating operation is finished, the user terminal is used for calibrating parameters;
step S103: selecting one of the lower partition plates as a lower partition plate to be measured, and erecting the laser tracker on the horizontal split surface of the cylinder body on one side adjacent to the lower partition plate to be measured; at least 5 reference target ball seats of the laser tracker measuring system are fixed on the cylinder surface of the cylinder body;
step S104: the temperature probe measures and records the initial temperature of the same metal material as the measured lower clapboard in the current environment;
step S105: measuring spatial coordinates of the reference target ball holder using the user terminal;
step S106: measuring space coordinates of the dent of the lower separator to be measured and the tip of the leaf top steam-resistant sheet thereof in the current view;
step S107: transferring a laser tracker in the laser tracker measuring system to the adjacent other side of the measured lower partition plate, and measuring the spatial coordinates of the reference target ball seat and the spatial coordinates of the depression of the measured lower partition plate and the tip of the leaf top steam-resistant sheet tooth under the field of vision after the station is transferred again;
step S108: and the temperature probe measures and records the final temperature of the same metal material as the measured lower partition plate in the current environment.
Preferably, the step S2 further includes:
step S201: fitting the space coordinates of the reference target ball seats at the two stations to the same coordinate system by using the user terminal, and performing temperature compensation on the initial temperature data and the final temperature data;
step S202: fitting the measured lower clapboard dimpled by using the user terminal and taking a cylinder as a characteristic body, and performing noise reduction processing on the coordinates in the cylinder; establishing circle centers of the upper bottom surface and the lower bottom surface of the cylinder as key points, connecting the circle centers with a straight line to serve as central lines of the dimples of the lower partition plate to be measured, establishing a space coordinate system by taking one of the circle centers as an original point, taking the central line of the dimples of the lower partition plate to be measured as an X axis and taking the central line of the dimples of the lower partition plate to be measured vertically upwards as a Z axis;
step S203: and fitting the vertical distance from each space point of the tooth tip of the steam-resistant sheet at the top of the lower partition plate to the central line of the hollow cavity of the lower partition plate to be measured by using the user terminal, and evaluating the concentricity of the hollow cavity of the lower partition plate to be measured and the steam-resistant sheet at the top of the lower partition plate to be measured through the vertical distance.
Step S204: and repeating the steps S103-S108 and the steps S201-S203, measuring and fitting the vertical distances from all the space points on the tooth tips of the lower partition plate blade top steam-resistant sheets to the center lines of the respective dimples one by one, and evaluating the concentricity of the lower partition plate blade top steam-resistant sheets and the respective dimples according to the vertical distances.
The implementation of the invention has the following beneficial effects: the laser tracker measuring system is adopted to measure the hollow cavities of the cylinder partition plate and the space coordinates of different positions of the same-stage blade top steam-resistant sheet in the circumferential direction, the distance from each position partition plate blade top steam-resistant sheet to the center of the hollow cavity of the partition plate is fitted, the concentricity of the partition plate blade top steam-resistant sheet and the center of the hollow cavity of the partition plate is evaluated, the through-flow condition of the steam turbine unit can be known more accurately, the efficiency of the unit is improved, and the operation safety of the unit is enhanced.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a method for measuring concentricity of a hollow nest of a cylinder partition plate and a blade top steam-resistant sheet of the cylinder partition plate by using a laser tracker measuring system;
FIG. 2 is a flowchart illustrating the step S1 according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating the step S15 according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating the operation of step S2 according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating the step S1 according to another embodiment of the present invention;
FIG. 6 is a flowchart illustrating the step S2 according to another embodiment of the present invention;
FIG. 7 is a horizontal sectional view of the steam turbine diaphragm of the present invention wherein 1-tip discourager, 2-tip discourager tooth tip, 3-diaphragm vapor seal block, 4-diaphragm dimple;
fig. 8 is a view of the mounting bracket of the laser tracker of the present invention.
Detailed Description
As shown in figure 1, the method for measuring the hollowness of the cylinder partition plate and the concentricity of the leaf top steam-resistant sheet thereof by the laser tracker measuring system is suitable for the partition plates of all types of cylinders such as a high-pressure partition plate, a medium-pressure partition plate, a low-pressure partition plate and the like of a steam turbine.
As shown in fig. 7, which is a horizontal sectional view of the steam turbine diaphragm of the present invention, since the step of measuring the concentricity of the dimples of the lower diaphragm and the steam-blocking blades at the top of the turbine diaphragm of the present invention is similar to the step of measuring the concentricity of the dimples of the upper diaphragm and the steam-blocking blades at the top of the turbine diaphragm, the step of measuring the concentricity of the dimples of the lower diaphragm and the steam-blocking blades at the top of the turbine diaphragm is taken as an example in this embodiment.
As shown in fig. 1, in the present embodiment, the laser tracking measurement system includes a user terminal, and a laser tracker and a reference target ball seat connected thereto, the laser tracker is provided with a temperature probe, the user terminal includes, but is not limited to, a desktop computer, a laptop computer, a handheld terminal, and the like, and the measurement is performed by using the laser tracking measurement system according to the following steps:
step S1: measuring and recording temperature data of the same metal as the partition plate material in the current environment by using a temperature probe, and measuring and recording position data of each space point of the depression of the partition plate and the tooth tips of the leaf top steam-resistant sheets by using a laser tracker;
step S2: and fitting each space point of the tooth tips of the steam-resistant sheets on the top of the partition plate to the vertical distance of the central line of the hollow cavity of the partition plate by using the user terminal through position data, and evaluating the concentricity of the hollow cavity of the partition plate and the steam-resistant sheets on the top of the partition plate through the vertical distance.
As shown in fig. 2, step S1 further includes:
step S11: disassembling the cylinder, and lifting the upper half cylinder, the upper partition plate and the rotor to a specific maintenance area to enable the cylinder to be in a state that the lower partition plate is not lifted; and then, disassembling all the steam seal blocks of the upper partition plate and the lower partition plate.
Specifically, the cylinder is disassembled, and upper half components such as an upper cylinder, an upper partition plate and the like are hoisted to a specific overhaul area; lifting the rotor to a specific maintenance area to enable the cylinder to be in a state that the lower partition plate is not lifted out; and then, disassembling all the steam seal blocks of the upper and lower partition plates.
Step S12: the laser tracker is conveyed to a lower half cylinder overhaul area, and a power supply is switched on for preheating; meanwhile, one of the lower partition plates is selected as the lower partition plate to be measured, and the laser tracker fixing support is fastened on the hollow nest of the adjacent lower partition plate to be measured, so that the laser tracker can be ensured to simultaneously detect the hollow nest of the lower partition plate to be measured and the leaf top steam-resistant sheet of the lower partition plate.
Specifically, the laser tracker is conveyed to a lower half cylinder overhaul field, a power supply is switched on for preheating, one lower partition plate of the lower partition plates is selected as a measured lower partition plate, a specially-made laser tracker fixing support is fastened on a hollow nest of an adjacent lower partition plate close to a steam-resistant sheet of the measured lower partition plate, and the hollow nest of the measured lower partition plate and a leaf top steam-resistant sheet of the hollow nest can be simultaneously measured after the laser tracker is erected on the support.
Step S13: and after the preheating work of the laser tracker is finished, calibrating the parameters by using the user terminal.
Specifically, after the laser Tracker is preheated, the Tracker Calib software of the user terminal is used for calibrating the instrument parameters.
Step S14: fixing the laser tracker on the erected fixed support, and enabling the measuring head to face downwards;
step S15: and measuring and recording temperature data of the same metal as the material of the lower partition plate to be measured in the current environment by using a temperature probe, and measuring and recording position data of each space point of the hollow cavity of the lower partition plate to be measured and the tip of the steam-resistant blade tooth of the leaf top thereof by using a laser tracker.
As shown in fig. 3, in the present embodiment, step S15 further includes
Step S151: measuring and recording initial temperature data of the same metal material as the measured lower partition plate in the current environment by using a temperature probe;
specifically, a temperature probe above the laser tracker is used for measuring and recording initial temperature data of the same metal material as the measured lower partition plate in the current environment, the temperature of the blade top steam-resistant sheet is not specified, and the default of the cylinder partition plate and the blade top steam-resistant sheet is consistent, so that the technical operation can be understood by a person skilled in the art.
Step S152: measuring and recording position data of at least 6 points of the surface of the depression of the lower partition plate to be measured in the circumferential direction by using a user terminal;
specifically, the surface of the measured lower clapboard depression is measured by using Spatial Analyzer (SA for short) software of the user terminal, that is, position data of at least 6 points are measured in a scattered and uniform manner in the circumferential direction of the measured lower clapboard depression, and further, the surface of the measured lower clapboard depression is measured by adopting a scanning method to pick up points, wherein the scanning range is at least more than 120 degrees.
Step S153: measuring and recording the position data of the space points of the tooth tips of the steam-resistant sheet at the top of the lower partition plate blade to be measured in different directions in the circumferential direction by using a user terminal; further, the number of the space points and the test orientations in step S153 are determined according to the size of the partition to be tested, the operation condition of the cylinder block, and other factors.
Step S154: and the temperature probe measures and records the final temperature data of the same metal material as the measured lower partition plate in the current environment.
Specifically, a temperature probe above the laser tracker is used for measuring and recording the final temperature data of the same metal material as the measured lower partition plate in the current environment, the temperature of the blade top steam-resistant sheet is not specified, and the default of the cylinder partition plate and the blade top steam-resistant sheet is consistent, so that the technical operation can be understood by a person skilled in the art.
As shown in fig. 4, in the present embodiment, step S2 further includes:
step S21: and performing temperature compensation on the initial temperature data and the final temperature data by using the user terminal.
Specifically, the initial temperature data and the final temperature data of the partition board recorded by measurement are subjected to temperature compensation through SA software of the user terminal, so that the whole measurement is under the uniform temperature, the measured partition board may slightly deform due to the temperature in the measurement process, the measurement result has deviation, and the temperature compensation is performed on the measured temperature, so that the measurement result is more accurate.
Step S22: fitting the depression of the lower partition plate to be measured by using the user terminal and taking the cylinder as a characteristic body, and performing noise reduction treatment on the coordinates in the cylinder; establishing circle centers of the upper bottom surface and the lower bottom surface of the cylinder as key points, connecting the circle centers with a straight line to serve as the center line of the depression of the lower partition plate to be measured, taking one of the circle centers as an original point, taking the center line of the depression of the lower partition plate to be measured as an X axis, and taking the vertical direction as a Z axis, and establishing a space coordinate system;
step S23: and fitting the vertical distance from each space point of the tooth tip of the steam-resistant sheet at the top of the lower partition plate to the central line of the hollow nest of the lower partition plate by using a user terminal, and evaluating the concentricity of the hollow nest of the lower partition plate and the steam-resistant sheet at the top of the lower partition plate by using the vertical distance.
In the present embodiment, step S2 further includes
Step S24: and repeating the steps S151-S154 and the steps S21-S23, measuring and fitting the vertical distances from all space points on the tooth tips of the lower partition plate blade top steam-resistant sheets capable of being measured to the center lines of the respective dimples one by one, and evaluating the concentricity of the lower partition plate blade top steam-resistant sheets and the respective dimples according to the vertical distances.
In this embodiment, step S1 further includes:
step S16: and after the lower partition plate measurement work is finished, the laser tracker is conveyed to an upper partition plate overhaul area of the cylinder, and the concentricity of the depression of the upper partition plate and the steam-resistant sheet on the top of the upper partition plate is measured.
Step S2 further includes:
step S25: and (4) based on the step S24, measuring and fitting the vertical distances from all space points on the measured tooth tips of the steam-resistant sheets on the top of the upper partition plate to the central lines of the dimples one by one, and evaluating the concentricity of the dimples of the upper partition plate and the steam-resistant sheets on the top of the upper partition plate through the vertical distances.
Specifically, the laser tracker is transferred to an upper partition plate overhaul area, based on steps S151-S154 and steps S21-S23, a first level is selected as a detected upper partition plate in the upper partition plate, the laser tracker is fixed in an area on the side of a steam-blocking piece at the same level of the detected upper partition plate, so that the laser tracker can simultaneously measure the dimples of the upper partition plate and the steam-blocking pieces of the upper partition plate, the vertical distance from each space point on the tooth tips of the steam-blocking pieces at the leaf tops of the upper partition plate to the center line of each dimple is measured and fitted one by one, and the concentricity of the dimples of the upper partition plate and the steam-blocking pieces at the leaf tops of the upper partition plate is evaluated through the vertical distance.
In this embodiment, when the laser tracker measures the lower partition plate, it needs to be fixed on the support, and the invention provides a preferable scheme that: as shown in fig. 8, the support is composed of three ordinary steel plates with thickness of 15mm, wherein the two steel plates have the same size, the length x width is 300mm x 250mm, and two M20 bolt holes are arranged at the 130mm x 62.5mm and 130mm x 187.5mm directions of the two plates; the other plate was 250mm by 210mm long by wide and had no bolt holes. The width of two plates with the same size is aligned with the length of the other plate, the two plates with the same size are vertically welded on the positions of 10mm and 90.5mm in the width direction of the third plate respectively, and the centers of bolt holes on the two plates are 170mm away from the third plate. In the using process, the lower partition plate is inserted into a groove formed by two steel plates with the same size, four M20 bolts are used for fastening the lower partition plate on the vertical surface of the partition plate, and then the magnetic suction cup of the laser tracker is attracted on the surface of the third steel plate.
In another embodiment of the present invention, as shown in fig. 5, when the lower partition is tested, the test is performed by using a laser tracker transfer station without installing a fixed support, and step S1 includes:
step S101: the cylinder is disassembled, and the lower partition plate is reserved in the cylinder body of the cylinder.
Specifically, the cylinder is disassembled, and upper half components such as an upper cylinder, an upper partition plate and the like are hoisted to a specific overhaul area; lifting the rotor to a specific maintenance area to enable the cylinder to be in a state that the lower partition plate is not lifted out; and then, disassembling all the steam seal blocks of the upper and lower partition plates.
Step S102: a pre-heating laser tracker; and after the preheating operation is finished, the user terminal is used for calibrating the parameters.
Specifically, the laser Tracker is transported to a lower half-cylinder overhaul site, a power supply is switched on for preheating, and after the laser Tracker is preheated, the Tracker Calib software of the user terminal is used for calibrating instrument parameters.
Step S103: selecting one of the lower partition plates as a lower partition plate to be measured, and erecting a laser tracker on the horizontal split surface of the cylinder body on one side adjacent to the lower partition plate to be measured; at least 5 reference target ball seats of the laser tracker measuring system are fixed on the cylinder surface of the cylinder body.
Specifically, one of the first-stage lower partition plates is selected as a lower partition plate to be measured, and a laser tracker is erected on the horizontal split surface of the cylinder body on the left side or the right side of the lower partition plate to be measured; at least 5 reference target ball seats are fixed on the cylinder surface.
Step S104: and the temperature probe measures and records the initial temperature of the same metal material as the measured lower partition plate in the current environment.
Specifically, in this embodiment, a temperature probe above the laser tracker is used to measure and record initial temperature data of the same metal material as the measured lower partition plate in the current environment, not referring to the temperature of the blade top steam-blocking sheet, and the cylinder partition plate and the blade top steam-blocking sheet material are in accordance by default, which can be understood by those skilled in the art.
Step S105: the spatial coordinates of the reference target tee are measured using a user terminal.
Specifically, the reference target ball seat space coordinates are measured using SA software of the user terminal.
Step S106: and measuring space coordinates of the dent of the lower separator to be measured and the tip of the steam-resistant blade at the top of the lower separator under the current visual field.
Step S107: and transferring the laser tracker in the laser tracker measuring system to the adjacent other side of the measured lower partition plate, and measuring the space coordinate of the reference target ball seat and the space coordinate of the depression of the measured lower partition plate and the tip of the leaf top steam-resistant sheet tooth under the field of vision after the station is transferred again.
Step S108: and the temperature probe measures and records the final temperature of the same metal material as the measured lower partition plate in the current environment.
Specifically, a temperature probe above the laser tracker is used for measuring and recording the final temperature data of the same metal material as the measured lower partition plate in the current environment, the temperature of the blade top steam-resistant sheet is not specified, and the default of the cylinder partition plate and the blade top steam-resistant sheet is consistent, so that the technical operation can be understood by a person skilled in the art.
As shown in fig. 6, step S2 further includes:
step S201: and fitting the space coordinates of the reference target ball seats under the two stations into the same coordinate system by using the user terminal, and performing temperature compensation on the initial temperature and the final temperature.
Specifically, the SA software of the user terminal is used to fit the measured reference target ball seats at the two stations into the same coordinate system, and the initial temperature and the final temperature are temperature compensated.
Step S202: fitting the depression of the lower partition plate to be measured by using the user terminal and taking the cylinder as a characteristic body, and performing noise reduction treatment on the coordinates in the cylinder; the circle centers of the upper bottom surface and the lower bottom surface of the cylinder are established as key points, the circle centers of the straight line connection are used as central lines of the pits of the lower partition plate to be measured, one circle center is used as an original point, the central line of the pit of the lower partition plate to be measured is used as an X axis, the vertical direction is used as a Z axis, and a space coordinate system is established.
Step S203: and fitting the vertical distance from each space point of the tooth tip of the steam-resistant sheet at the top of the lower partition plate to the central line of the hollow nest of the lower partition plate by using a user terminal, and evaluating the concentricity of the hollow nest of the lower partition plate and the steam-resistant sheet at the top of the lower partition plate by the vertical distance.
Step S204: and repeating the steps S103-S108 and the steps S201-S203, measuring and fitting the vertical distance from each space point on the tooth tips of the lower partition plate blade top steam-resistant sheets capable of being measured to the central line of each hollow nest one by one, and evaluating the concentricity of the lower partition plate blade top steam-resistant sheets and each hollow nest through the vertical distance.
Understandably, each stage of separator depression and each depression data can be measured and recorded, and the data is processed in a centralized manner by a user terminal.
The invention has the following beneficial effects: the through-flow clearance of the steam turbine cylinder plays a crucial role in preventing the dynamic and static rubbing of the steam turbine. Historically, there have been accidents where the rotor bends due to improper clearances, which have caused significant economic losses and adverse effects to the enterprise. Therefore, the method can monitor the state of the steam-blocking piece of the cylinder more accurately and comprehensively, enhances the understanding of the through-flow condition and the state of the turbine unit of the steam turbine, is beneficial to improving the efficiency of the turbine unit, and further improves the reliability and the safety of the operation of the turbine unit.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A method for measuring concentricity of a hollow nest of a cylinder partition plate and a steam-blocking piece at the top of the hollow nest of the cylinder partition plate uses a laser tracking measuring system to carry out measurement, the laser tracking measuring system comprises a user terminal, a laser tracker and a reference target ball seat, the laser tracker is provided with a temperature probe, and the method is characterized by comprising the following steps of:
step S1: measuring and recording temperature data of the same metal as the partition plate material in the current environment by using the temperature probe, and measuring and recording position data of each space point of the depression of the partition plate and the tooth tips of the leaf top steam-resistant sheets thereof by using the laser tracker;
step S2: and fitting the partition plate hollow cavity through the position data by using the user terminal, creating a center line of the partition plate hollow cavity, fitting the vertical distance from each space point of the tooth tips of the steam-resistant sheets on the top of the partition plate to the center line of the partition plate hollow cavity, and evaluating the concentricity of the partition plate hollow cavity and the steam-resistant sheets on the top of the partition plate through the vertical distance.
2. The method for measuring concentricity of a cylinder diaphragm pocket and a tip vapor barrier thereof as claimed in claim 1, wherein the step S1 further comprises:
step S11: disassembling the cylinder, and lifting the upper half cylinder, the upper partition plate and the rotor to a specific maintenance area to enable the cylinder to be in a state that the lower partition plate is not lifted; subsequently, disassembling all steam seal blocks of the upper partition plate and the lower partition plate;
step S12: the laser tracker is conveyed to a lower half cylinder overhaul area, and a power supply is switched on for preheating; meanwhile, one stage of the lower partition plate is selected as a measured lower partition plate, and the laser tracker fixing support is fastened on the hollow nest of the adjacent stage of the measured lower partition plate, so that the laser tracker can be ensured to simultaneously detect the hollow nest of the measured lower partition plate and the leaf top steam-resistant sheet of the hollow nest;
step S13: after the preheating work of the laser tracker is finished, the user terminal is used for calibrating parameters;
step S14: fixing the laser tracker on the erected fixed support, and enabling the measuring head to face downwards;
step S15: and measuring and recording temperature data of the same metal as the measured lower partition plate material in the current environment by using the temperature probe, and measuring and recording position data of each space point of the depression of the measured lower partition plate and the tooth tips of the leaf top steam-resistant sheets by using the laser tracker.
3. The method for measuring concentricity of a cylinder diaphragm pocket and a tip vapor barrier thereof as claimed in claim 2, wherein the step S15 further comprises
Step S151: measuring and recording initial temperature data of the same metal material as the measured lower partition plate in the current environment by using the temperature probe;
step S152: measuring and recording position data of at least 6 points of the measured lower partition plate dimple surface in the circumferential direction using the user terminal;
step S153: measuring and recording the position data of the space points of the tooth tips of the steam-resistant sheet at the top of the measured lower partition plate blade in different directions in the circumferential direction by using the user terminal;
step S154: and the temperature probe measures and records the final temperature data of the same metal material as the measured lower partition plate in the current environment.
4. The method for measuring the concentricity of the hollow cavity and the top steam stop sheet of the cylinder partition plate as claimed in claim 3, wherein the test number and the test orientation of the space points in the step S153 are determined according to the size of the partition plate to be tested and the operation condition of the cylinder unit.
5. The method for measuring concentricity of a cylinder diaphragm pocket and a tip vapor barrier thereof as claimed in claim 3, wherein the step S2 further comprises:
step S21: using the user terminal to perform temperature compensation on the initial temperature data and the final temperature data;
step S22: fitting the measured lower clapboard dimpled by using the user terminal and taking a cylinder as a characteristic body, and performing noise reduction processing on the coordinates in the cylinder; establishing circle centers of the upper bottom surface and the lower bottom surface of the cylinder as key points, connecting the circle centers with a straight line to serve as central lines of the dimples of the lower partition plate to be measured, establishing a space coordinate system by taking one of the circle centers as an original point, taking the central line of the dimples of the lower partition plate to be measured as an X axis and taking the central line of the dimples of the lower partition plate to be measured vertically upwards as a Z axis;
step S23: and fitting the vertical distance from each space point of the tooth tip of the steam-resistant sheet at the top of the lower partition plate to the central line of the hollow cavity of the lower partition plate to be measured by using the user terminal, and evaluating the concentricity of the hollow cavity of the lower partition plate to be measured and the steam-resistant sheet at the top of the lower partition plate to be measured through the vertical distance.
6. The method for measuring concentricity of a cylinder diaphragm pocket and a tip vapor barrier thereof as claimed in claim 5, wherein the step S2 further comprises:
step S24: and repeating the step S151 to the step S154 and the step S21 to the step S23, measuring and fitting the vertical distance from each space point on the tooth tips of the lower partition plate blade top steam-resistant sheets to the center line of each hollow nest one by one, and evaluating the concentricity of the lower partition plate blade top steam-resistant sheets and each hollow nest according to the vertical distance.
7. The method for measuring concentricity of a cylinder diaphragm pocket and a tip vapor barrier thereof as claimed in claim 2, wherein the step S1 further comprises:
step S16: and after the lower partition plate measurement work is finished, the laser tracker is conveyed to an upper partition plate overhaul area of the cylinder, and the concentricity of the depression of the upper partition plate and the steam-blocking sheets on the tops of the depression of the upper partition plate is measured.
8. The method for measuring concentricity of a cylinder diaphragm pocket and a tip vapor barrier thereof as claimed in claim 6, wherein the step S2 further comprises:
step S25: and (4) measuring and fitting the vertical distances from all space points on the measured tooth tips of the steam-resistant sheets on the top of the upper partition plate to the central lines of the dimples one by one on the basis of the step S24, and evaluating the concentricity of the dimples of the upper partition plate and the steam-resistant sheets on the top of the upper partition plate according to the vertical distances.
9. The method for measuring the concentricity of a cylinder diaphragm pocket and a blade tip vapor barrier thereof according to claim 3, wherein the step S1 comprises:
step S101: disassembling the cylinder and keeping the lower partition plate in the cylinder body of the cylinder;
step S102: preheating the laser tracker; after the preheating operation is finished, the user terminal is used for calibrating parameters;
step S103: selecting one of the lower partition plates as a lower partition plate to be measured, and erecting the laser tracker on the horizontal split surface of the cylinder body on one side adjacent to the lower partition plate to be measured; at least 5 reference target ball seats of the laser tracker measuring system are fixed on the cylinder surface of the cylinder body;
step S104: the temperature probe measures and records the initial temperature data of the same metal material as the measured lower partition plate in the current environment;
step S105: measuring spatial coordinates of the reference target ball holder using the user terminal;
step S106: measuring space coordinates of the dent of the lower separator to be measured and the tip of the leaf top steam-resistant sheet thereof in the current view;
step S107: transferring a laser tracker in the laser tracker measuring system to the adjacent other side of the measured lower partition plate, and measuring the spatial coordinates of the reference target ball seat and the spatial coordinates of the depression of the measured lower partition plate and the tip of the leaf top steam-resistant sheet tooth under the field of vision after the station is transferred again;
step S108: and the temperature probe measures and records the final temperature data of the same metal material as the measured lower partition plate in the current environment.
10. The method for measuring concentricity of a cylinder diaphragm pocket and a tip vapor barrier thereof as claimed in claim 9, wherein the step S2 further comprises:
step S201: fitting the space coordinates of the reference target ball seats at the two stations to the same coordinate system by using the user terminal, and performing temperature compensation on the initial temperature data and the final temperature data;
step S202: fitting the measured lower clapboard dimpled by using the user terminal and taking a cylinder as a characteristic body, and performing noise reduction processing on the coordinates in the cylinder; establishing circle centers of the upper bottom surface and the lower bottom surface of the cylinder as key points, connecting the circle centers with a straight line to serve as central lines of the dimples of the lower partition plate to be measured, establishing a space coordinate system by taking one of the circle centers as an original point, taking the central line of the dimples of the lower partition plate to be measured as an X axis and taking the central line of the dimples of the lower partition plate to be measured vertically upwards as a Z axis;
step S203: fitting the vertical distance from each space point of the tooth tip of the steam-resistant sheet at the top of the lower partition plate to the central line of the hollow cavity of the lower partition plate to be measured by using the user terminal, and evaluating the concentricity of the hollow cavity of the lower partition plate to be measured and the steam-resistant sheet at the top of the lower partition plate to be measured according to the vertical distance;
step S204: and repeating the step S103 to the step S108 and the step S201 to the step S203, measuring and fitting the vertical distance from each space point on the tooth tips of the lower partition plate blade top steam-blocking sheets to the center line of each hollow nest one by one, and evaluating the concentricity of the lower partition plate blade top steam-blocking sheets and each hollow nest according to the vertical distance.
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| CN2018112033254 | 2018-10-16 | ||
| CN201811203325 | 2018-10-16 |
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| CN113653538A (en) * | 2021-05-20 | 2021-11-16 | 大唐信阳发电有限责任公司 | Mounting method of small-gap soft-tooth steam seal |
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