Concentricity detection device for steam turbine generator rotor and detection method thereof

Abstract

The invention relates to the technical field of concentricity detection, in particular to a concentricity detection device for a steam turbine generator rotor, which comprises a base, a driving structure and a micrometer arranged at the lower end of the driving structure, the supporting end is provided with a driving module for rotation of the rotor, and the clamping chuck is rotationally arranged on the base and used for rotating and supporting the generator rotor. The number of the driving structures is two, and the two driving structures are arranged on the sides, close to the clamping chuck, of the supporting end respectively and used for automatic concentricity detection of the generator rotor. According to the invention, automatic detection of the generator rotor by the detection device is realized, through cooperative use of the supporting end and the clamping chuck, the rotor is conveniently limited and automatic axial rotation is carried out at the same time, and then through cooperative use of the pressure detection seat and the stress roller, the bending influence of the side surface of the rotor is eliminated, and the detection precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of generator rotor detection, in particular to a concentricity detection device for a steam turbine generator rotor and a detection method thereof. BACKGROUND

[0002] A steam turbine generator refers to a generator driven by a steam turbine. Superheated steam generated by a boiler enters a steam turbine to expand and do work, causing the blades to rotate and drive the generator to generate electricity. The waste steam after work is sent back to the boiler for recycling through a condenser, a circulating water pump, a condensate pump, and a feedwater heating device. The steam turbine acts as a prime mover to drive the rotor to rotate, and the mechanical energy is converted into electrical energy by electromagnetic induction principle. The detection of the concentricity of the rotor is a core link to ensure the safe and efficient operation of the steam turbine generator and plays an important role.

[0003] The existing invention patent with the publication number CN117704936A records: "A generator rotor shaft concentricity testing mechanism relates to the technical field of generator production. The generator rotor shaft concentricity testing mechanism includes a workbench, a to-be-tested motor, a driving motor, and a micrometer. The to-be-tested motor is fixedly connected to the top of the workbench. The rotor shaft front end of the to-be-tested motor is fixedly connected with a shaft coupling. The shaft coupling is fixedly connected with a standard rod away from the to-be-tested motor. The driving motor can drive the lead screw to drive the driving disc to move linearly, causing the standard rod to be clamped into the slot on the driving disc, so that the micrometer on the fixed support contacts the upper surface of the standard rod. The driving motor can drive the micrometer to continuously move towards the to-be-tested motor. The to-be-tested motor can drive the standard rod to rotate, so that the micrometer can detect the concentricity of any part on the standard rod, i.e., the micrometer can test the concentricity of the generator rotor shaft."

[0004] The above-mentioned engine rotor shaft concentricity detection is relatively cumbersome, and the detection data cannot prioritize the judgment of whether the rotor body is bent or not, which is not conducive to the concentricity detection of the engine rotor. Before the assembly of the steam turbine generator, the rotation work of the generator cannot be used to provide power drive for the concentricity detection of the rotor, the automation is low, and the detection precision is not high. Based on the above reasons, it is necessary to design a steam turbine generator rotor concentricity detection device that is convenient to operate and has high detection precision. SUMMARY

[0005] The purpose of the present application is to provide a concentricity detection device for a steam turbine generator rotor and a detection method thereof to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: Concentricity detection device for steam turbine generator rotor, including base, drive structure and micrometer provided at lower end of drive structure, top of base is provided with oppositely distributed support end and clamping chuck at both ends, drive module for rotation of rotor is provided on support end, clamping chuck is rotationally provided on base for rotation support of generator rotor; The number of drive structures is two groups, and the two groups of drive structures are respectively provided on the closer side of the support end and the clamping chuck for automatic concentric detection of the generator rotor.

[0007] As preferred, a moving trolley is longitudinally slidably arranged on the base between the support end and the clamping chuck, a main lifting mechanism is vertically arranged on the top of the moving trolley, a pressure detection seat is arranged on the top of the main lifting mechanism, two force rollers of V-shaped distribution are rotationally arranged on the top of the pressure detection seat for flexible detection of the side of the generator rotor.

[0008] As preferred, the pressure detection seat comprises a container box and a plurality of detection support members uniformly supported in the container box, the container box comprises two box bodies staggered up and down, the box bodies are made of hard material for side detection of the generator rotor.

[0009] As preferred, the detection support member comprises two extrusion plugs oppositely distributed and a same spring sleeved outside the two extrusion plugs, a same buffer tube is penetratingly arranged outside the two extrusion plugs, buffer cavities for sliding of the extrusion plugs are arranged at both ends of the buffer tube, a same folding detection cavity is penetratingly arranged between the two buffer cavities, a wind speed sensor is rotationally arranged in the folding detection cavity for deformation detection of the detection support member.

[0010] As preferred, support pads are arranged at the upper and lower ends of the two extrusion plugs, and the support pads are respectively connected with the two box bodies, the support pads are made of rubber material, and a pressure sensor is arranged in the support pad.

[0011] As preferred, the axis of the force roller is perpendicular to the support end and the clamping chuck, a same concentricity measuring end is parallelly arranged at the middle part of the two force rollers, a sub-lifting mechanism vertically connected with the pressure detection seat is arranged at the lower end of the concentricity measuring end for flexible concentricity detection of the generator rotor.

[0012] As preferred, a limiting arc-shaped seat is arranged on the side of the support end close to the clamping chuck, horizontal limiting ends are horizontally penetratingly arranged at both sides of the limiting arc-shaped seat, a longitudinal jack is penetratingly arranged on the support end, a rotary driving end is horizontally arranged at the telescopic end of the longitudinal jack, a resisting end is arranged at the driving end of the rotary driving end, a plurality of movable clamping claws are slidably arranged on the clamping chuck for limiting and rotating of the generator rotor.

[0013] As preferred, the telescopic end of the horizontal limiting end is provided with a limiting plate, an inner groove is formed in the end of the limiting plate away from the limiting arc-shaped seat, and a plurality of rolling balls are rotatably arranged in the inner groove.

[0014] As preferred, the limiting plate is made of elastic material and has an arc-shaped structure, and the rotating shafts of the rolling balls are parallel to the rotating shaft of the rotating driving end, for rotation limiting of the rotor of the generator.

[0015] The detection method of the steam turbine generator rotor concentricity detection device comprises the following steps: Step one: through the setting of the limiting arc-shaped seat and the force roller, the assembled generator and rotor are simultaneously limited between the support end and the clamping chuck, then the longitudinal top rod is used for longitudinal limiting of the generator and rotor, the telescopic horizontal limiting end is used for transverse clamping of one end of the rotor by two groups of oppositely distributed limiting plates, and then the inward contraction of the movable clamping jaw on the clamping chuck is used for clamping treatment of the other end of the generator and rotor; Step two: through the length telescoping of the driving structure, the two sides of the micrometer are respectively attached to the two ends of the rotor to complete the concentricity detection preparation of the end of the rotor, then the length telescoping of the main lifting mechanism is used to attach the two force rollers to the rotor, and the length telescoping of the auxiliary lifting mechanism is used to attach the concentricity measuring end to the lower end surface of the rotor to complete the detection preparation of the concentricity and the curvature of the middle part of the rotor; Step three: through the rotating drive of the rotating driving end and the rotating setting of the clamping chuck on the top of the base, the use of the rolling balls in the limiting plate, the generator rotor rotates around its axis as the rotating shaft, the two micrometers respectively detect the concentricity of the two ends of the rotor, the concentricity measuring end detects the concentricity of the middle part of the rotor, the force roller conducts force transmission to the side wall of the generator rotor, the pressure detection seat can be squeezed, a plurality of detection supporting pieces detect the bending state of the side surface of the rotor, and the concentricity detection accuracy is improved; Step four: the moving trolley slides along the longitudinal direction of the base to realize detection coverage of different positions of the rotor in the axial direction; the main lifting mechanism drives the pressure detection seat to ascend and descend, so that the force roller can adapt to the diameter change of the rotor and be attached; the auxiliary lifting mechanism independently adjusts the height of the concentricity measuring end to ensure that it is in precise contact with the surface of the rotor, and the three work together to realize the concentricity detection of the full length and multiple sections of the rotor.

[0016] Compared with the prior art, the present application has the following advantages: 1. In the application, by the cooperation of the supporting end and the clamping chuck, the generator rotor of different specifications can be horizontally supported first, the relative extrusion of the generator rotor is realized by using the upper limiting plate of the two horizontal limiting ends, the end of the generator rotor is pressed by the longitudinal jack, the generator rotor can be limited, the parallel arrangement of the multiple rolling balls on the limiting plate and the end that is pressed, and the rotation of the clamping chuck on the base can provide favorable conditions for the rotation detection of the generator rotor, the two groups of driving structures and the micrometer can be flexibly used to automatically detect the generator rotor, and the detection accuracy and convenience are increased; 2. In the application, the sliding arrangement of the moving trolley between the supporting end and the clamping chuck, and the cooperation of the pressure detection seat and the stress roller can increase the rotor bending degree detection device on the concentricity detection device, the height of the stress roller is adjusted by using the main lifting mechanism, so that the detection device is adapted to different diameter rotors, and then the multiple detection supporting pieces in the pressure detection seat are used, so that the wind speed sensor can conveniently use the folded detection cavity to increase the pressure, the wind speed sensor can sensitively detect the longitudinal deformation state of the supporting piece, the bending condition of the rotor can be mastered, the influence of the data of the rotor bending can be quickly avoided, and the concentricity detection standard degree of the detection device is increased; 3. In the application, by arranging the concentricity measurement end between the two stress rollers, the length of the auxiliary lifting mechanism can be conveniently stretched and retracted, and the auxiliary lifting mechanism can be attached to the side wall of the rotor, so that the concentricity of the side of the rotor can be detected while the bending degree of the rotor is detected, the pressure sensor in the detection supporting piece is used to detect the pressure of the detection box in the transverse or inclined direction, the multidimensionality of the concentricity detection device is increased, the detection steps are saved, the concentricity detection data can be corrected, and the accuracy of the concentricity detection of the device is increased. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the application; Figure 2 It is a schematic diagram of the structure of the moving trolley in the application; Figure 3 It is an exploded view of the structure of the pressure detection seat in the application; Figure 4 It is an exploded view of the structure of the detection supporting piece in the application; Figure 5 It is a sectional view of the buffer tube in the application; Figure 6 It is a distribution state diagram of the extrusion plug and the buffer cavity in the application; Figure 7 It is a schematic diagram of the structure of the supporting end in the application; Figure 8 It is an exploded view of the structure of the limiting plate in the application.

[0018] In the figure: 1, base; 2, driving structure; 3, micrometer; 4, moving trolley; 6, main lifting mechanism; 7, auxiliary lifting mechanism; 8, pressure detection seat; 9, container box; 10, detection support; 11, extrusion plug; 12, buffer tube; 13, spring; 14, buffer cavity; 15, folding detection cavity; 17, wind speed sensor; 18, support pad; 19, pressure sensor; 20, force roller; 21, concentricity measurement end; 22, support end; 23, clamping chuck; 24, limit arc seat; 25, horizontal limit end; 26, longitudinal top rod; 27, rotary driving end; 28, abutting end; 29, limit plate; 30, rolling ball. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0020] Please refer to Figures 1-8 , the present application provides a technical solution: The concentricity detection device for the rotor of a steam turbine generator, when the rotor is detected, the generator is placed on the base 1 with the rotor, the end of the rotor is against the micrometer 3, the driving structure 2 adopts a motor-driven screw rod to adjust the length, realizing the position adjustment of the micrometer 3, the position adjustment of the micrometer 3 is for the contact type concentricity detection of the rotor; in order to accurately and automatically detect the rotor, the detection device can be provided with a support end 22 and a clamping chuck 23 at the top of the base 1, the support end 22 and the clamping chuck 23 are distributed opposite to each other, and the rotor is placed between the two structures during detection; and the driving module for the rotation of the rotor is provided on the support end 22, and the clamping chuck 23 is perpendicular to the base 1, and the rotation is realized through the bearing and bearing seat, the detection position of the rotor of the generator is limited and supported, and the automatic rotation detection of the rotor is facilitated (the driving module of the support end 22 is integrated in the rotary driving end 27, the abutting end 28 is rotated by the motor, and the bearing rotation structure of the clamping chuck 23 is matched to form the synchronous rotation driving force of the two ends of the rotor, so as to ensure the stable rotation of the rotor around its own axis); then, the detection device can use two groups of driving structures 2, the two groups of driving structures 2 are respectively arranged on the closer side of the support end 22 and the clamping chuck 23, the two ends of the rotor to be detected are flexibly detected, different specifications of the rotor of the generator are conveniently adapted, and the detection automation and universality are increased.

[0021] In order to facilitate the concentricity detection of different areas and parts of the rotor, such as Figure 1 and 2As shown, in some embodiments, a movable trolley 4 can be slidably mounted on the base 1. The movable trolley 4 can be slidably mounted longitudinally between the support end 22 and the clamping chuck 23. Then, a main lifting mechanism 6 for automatic length adjustment, such as an electric push rod or a hydraulic rod, is vertically mounted on the top of the movable trolley 4. A pressure detection seat 8 is mounted on the top of the main lifting mechanism 6. Two force rollers 20 are rotatably mounted on the top of the pressure detection seat 8, and the two force rollers 20 are V-shaped distributed on the top of the pressure detection seat 8 and on both sides of the rotor. The main lifting mechanism 6 drives the force rollers 20 to fit against the side of the rotor, so that the rotating rotor drives the standard force rollers 20 on both sides to rotate. When the rotor structure bends, the rotating rotor will drive the force rollers 20 unevenly on the side, causing the pressure detection seat 8 to be squeezed and deformed. By moving the pressure detection seat 8 and the movable trolley 4, the side of the generator rotor can be flexibly detected.

[0022] It is worth noting that the pressure testing seat 8 is designed to detect the rotor's bending degree, such as... Figure 3 and 4 As shown, in some embodiments, the pressure detection seat 8 can use a container 9 as a support housing. The container 9 is supported by multiple detection support members 10 evenly distributed inside the container 9. The container 9 is supported by multiple detection support members 10 through two vertically staggered rigid material boxes in the container 9. The container 9 is initially used horizontally to transmit the force state of the upper force roller 20, providing favorable conditions for the side detection of the generator rotor.

[0023] In order to accurately detect the force state of the force roller 20, such as Figure 4 , 5As shown in FIGS. 6, in some embodiments, the detection support 10 can use two extrusion plugs 11 distributed oppositely up and down and the same spring 13 sleeved outside the two extrusion plugs 11, the spring 13 being a resilient support structure and the extrusion plugs 11 being limiting structures; then the same buffer tube 12 is arranged outside the two extrusion plugs 11, both ends of the buffer tube 12 being provided with buffer cavities 14, for the extrusion plugs 11 to slide up and down after penetrating the buffer tube 12, and then the same folding detection cavity 15 is arranged through between the two buffer cavities 14, wherein it is worth noting that the diameter of the folding detection cavity 15 is less than 1 / 3 of the diameter of the buffer cavity 14, and a through hole can be opened on one side of the folding detection cavity 15 to facilitate the flow of gas in the buffer tube 12, so as to pressurize the air change driven by the extrusion plug 11; then, the wind speed sensor 17 can be arranged in rotation in the folding detection cavity 15, and the flow of pressurized air can be used to detect the deformation data of the detection support 10, reflect the stress condition of the stress roller 20, and then obtain the bending condition of the rotor, so as to avoid the bending to affect the detection data of the concentricity and increase the precision of the rotor concentricity detection. When the rotor is bent, the stress roller 20 is unevenly stressed and transmitted to the container box 9, so that the upper and lower box bodies are relatively displaced, the extrusion plug 11 is pushed to slide in the buffer tube 12, and the air in the buffer cavity 14 is compressed; since the diameter of the folding detection cavity 15 is much smaller than that of the buffer cavity 14, the flow rate of the air increases sharply when flowing through, and the wind speed sensor 17 quantifies the displacement of the extrusion plug 11 by detecting the wind speed change, and then reflects the bending degree of the rotor.

[0024] Further, as shown in FIGS. 6, Figure 4 in some embodiments, support pads 18 can be arranged at the upper and lower ends of the two extrusion plugs 11, and the spring 13 is located between the two support pads 18 to longitudinally support the support with elastic force, so that the support pad 18 abuts against the adjacent box body, the support pad 18 uses rubber material, and the pressure sensor 19 arranged in the support pad 18 detects the pressure condition of the support pad 18 by using the elastic characteristics of the rubber material, judges the pressure data of the box body under the horizontal or inclined state, and improves the stress detection diversity and precision of the stress roller 20.

[0025] Secondly, as shown in FIGS. 6, Figure 1As shown, the axis of the force roller 20 is perpendicular to the support end 22 and the clamping chuck 23, facilitating the adhesion of the side of the force roller 20 to the side of the rotor, and then a concentricity measuring end 21 is arranged in parallel in the middle of the two force rollers 20, and the vertical use of the auxiliary lifting mechanism 7 between the lower end of the concentricity measuring end 21 and the pressure detection seat 8, wherein the auxiliary lifting mechanism 7 can use the existing electric push rod or hydraulic cylinder structure, facilitating the flexible adhesion of the concentricity measuring end 21 to the surface of the rotor with different diameters, increasing the versatility of the concentricity measuring end 21, and the concentricity measuring end 21 can use the existing micrometer 3 or roundness instrument and other concentricity measuring instruments, using the existing measuring instrument to drive the sensor (such as inductance probe) around the rotor rotating with the high-precision main shaft, while using the moving trolley 4 to move along the axial direction, the radial deviation data can be collected, and the software automatically calculates the concentricity and other parameters. Through the length expansion and contraction of the auxiliary lifting mechanism 7, the detection device can flexibly detect the concentricity of the middle part of the generator rotor. The data detected by the device is configured with a data acquisition and analysis system, which can receive the detection signals of the wind speed sensor 17, the pressure sensor 19, and the concentricity measuring end 21 in real time, fuse the bending degree data and the radial deviation data through algorithm, and automatically generate a concentricity detection report, eliminating the interference of rotor bending on the results.

[0026] Next, in order to clamp and rotate the support end 22 to drive the rotor, as shown, Figure 7 As shown, in some embodiments, the support end 22 is first provided with a U-shaped limiting arc seat 24 near the clamping chuck 23 as a placing end of the rotor; then a horizontal limiting end 25 is arranged on both sides of the limiting arc seat 24 for lateral limiting of the rotor; a longitudinal jack 26 is arranged through the support end 22, which can use an electric push rod, a ball screw, etc.; then a rotary driving end 27 is horizontally arranged at the extension end of the longitudinal jack 26, which can use a motor structure, and the rotary driving end 27 can drive the abutting end 28 of the driving end to rotate, thereby longitudinally limiting the rotor and rotating the rotor; secondly, when the clamping chuck 23 is arranged, the clamping chuck 23 is arranged with a plurality of movable clamping jaws driven by a motor driven screw to move, and the movable clamping jaws are simultaneously moved inward and outward, thereby clamping the end of the rotor, and the clamping and supporting end 22 is used in cooperation with the clamping chuck 23, facilitating the limiting and rotation of the generator rotor, and providing stable support and detection conditions for the detection of the rotor. Among them, the travel of the movable clamping jaw of the clamping chuck 23 can be adjusted (adjustment range 50-500mm), and the extension amount (0-300mm) of the longitudinal jack 26 of the support end 22 and the transverse adjustment amount (0-200mm) of the horizontal limiting end 25 can be adjusted, which can adapt to the steam turbine generator rotor with a length of 1-5m and a diameter of 100-800mm.

[0027] Among them, in some embodiments, as shown, Figure 8As shown, in order to facilitate the lateral positioning of the rotor, the telescopic end of the horizontal limiting end 25 can be provided with a limiting plate 29. The limiting plate 29 can be used as a fitting structure with the rotor. Then, an inner groove is opened at the end of the limiting plate 29 away from the limiting arc-shaped seat 24. A plurality of rolling balls 30 are arranged in the inner groove, which facilitates the limiting of the limiting plate 29 and the side of the rotor, and facilitates the rotation of the rotor.

[0028] Further, the limiting plate 29 can be made of elastic material, and the limiting plate 29 has an arc-shaped structure. When the two limiting plates 29 simultaneously limit the rotor, they can be in close contact with the rotor over a larger area. The rotating shaft of the rolling ball 30 is arranged in parallel with the rotating shaft of the rotating drive end 27, which facilitates the rotation of the rolling ball 30 along with the rotation of the rotor, ensures the stable clamping of the rotor on the supporting end 22, and facilitates the detection of the rotation and limiting of the generator rotor by the detection device.

[0029] Method for detecting concentricity of steam turbine generator rotor: Step one: through the arrangement of the limiting arc-shaped seat 24 and the force roller 20, the assembled generator and rotor are simultaneously limited between the supporting end 22 and the clamping chuck 23. Then, the longitudinal telescopic rod 26 is used to resist the end 28 to longitudinally limit the generator and the rotor. The telescopic extension of the horizontal limiting end 25 is used to simultaneously horizontally clamp one end of the rotor by two oppositely distributed limiting plates 29. Then, the inward contraction of the movable clamping jaw on the clamping chuck 23 is used to clamp the other end of the generator and the rotor. Step two: through the length extension of the driving structure 2, the two sides of the micrometer 3 are respectively attached to the two ends of the rotor to complete the concentricity detection preparation of the end of the rotor. Then, through the length extension of the main lifting mechanism 6, the two force rollers 20 are attached to the rotor. Then, through the length extension of the auxiliary lifting mechanism 7, the concentricity measuring end 21 is attached to the lower end surface of the rotor to complete the detection preparation of the concentricity and the curvature of the middle part of the rotor. Step three: through the rotation of the rotating drive end 27 and the rotation of the clamping chuck 23 on the top of the base 1, the use of the rolling ball 30 in the limiting plate 29, the generator rotor rotates around its axis as the rotation axis. The two micrometers 3 respectively detect the concentricity of the two ends of the rotor, and the concentricity measuring end 21 detects the concentricity of the middle part of the rotor. The force roller 20 conducts force to the side wall of the generator rotor, which can extrude the pressure detection seat 8. The wind speed sensor 17 and the pressure sensor 19 of the plurality of detection supporting members 10 transmit the curvature data in real time to the analysis system. The system corrects the detection results of the concentricity measuring end 21 and the micrometer 3, eliminates the radial deviation caused by the bending of the rotor, and improves the accuracy of the concentricity detection. Step four: the moving trolley 4 slides along the base 1 longitudinally to realize detection coverage of different positions of the rotor shaft; the main lifting mechanism 6 drives the pressure detection seat 8 to lift, so that the force roller 20 adapts to the change of the rotor diameter and is attached; the auxiliary lifting mechanism 7 independently adjusts the height of the concentricity measuring end 21 to ensure accurate contact with the rotor surface, and the three work together to realize the concentricity detection of the full length and multiple sections of the rotor.

[0030] The working principle of the application is as follows: When the generator rotor is detected by the concentricity detection device, the accurate detection of the rotor concentricity is realized through the cooperative mechanism of “mechanical clamping-automatic rotation-multi-dimensional detection-data arrangement”, and the specific process is as follows: 1. Rotor positioning and driving First, the rotor is placed between the limiting arc seat 24 and the clamping chuck 23 of the supporting end 22, and the rotor is clamped by the cooperation of the horizontal limiting end 25 and the longitudinal jack 26, as well as the inward clamping of multiple movable clamps; the rotating driving end 27 (built-in motor) of the supporting end 22 drives the abutting end 28 to rotate, and cooperates with the bearing rotating structure of the clamping chuck 23 to make the rotor rotate stably around its own axis. The horizontal limiting end 25 realizes horizontal limiting through the arc limiting plate 29 and the multiple rolling balls 30 arranged on one side of the horizontal limiting end 25, and at the same time reduces the rotating friction. 2. Multi-dimensional concentricity detection End detection: two groups of driving structures 2 (motor-driven lead screws) adjust the position of the micrometer 3 to make it attach to the two ends of the rotor, and real-time collection of the end radial deviation is realized. Middle detection: the moving trolley 4 slides along the base 1 longitudinally, the main lifting mechanism 6 adjusts the height of the pressure detection seat 8 to make the V-shaped force roller 20 attach to the side of the rotor; the auxiliary lifting mechanism 7 independently adjusts the height of the concentricity measuring end 21 (micrometer 3 or roundness instrument) to make it contact the surface of the rotor, and synchronously collect the middle radial data with the moving trolley 4. 3. Curvature detection and data correction When the rotor is bent, the rotating rotor generates uneven lateral force on the force roller 20, which promotes the relative displacement of the upper and lower box bodies of the container box 9 of the pressure detection seat 8, and in turn pushes the extrusion plug 11 of the detection support 10 to slide in the buffer tube 12. When the air in the buffer cavity 14 is collected into the detection cavity 15 (diameter ≤ 1 / 3 of the buffer cavity 14), the flow rate increases suddenly, and the wind speed sensor 17 indicates the rotor curvature condition through the wind speed change amount; then the horizontal or inclined pressure is synchronously detected by the pressure sensor 19 of the support pad 18, and the curvature state data is supplemented, so that the rotor curvature factor can be quickly excluded, and its influence on the concentricity detection data is reduced. Finally, the curvature state data is transmitted to the analysis system to provide favorable conditions for the subsequent detection of the concentricity measuring end 21 and the micrometer 3, and finally the accurate detection report is obtained.

[0031] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations and modifications are intended to be included within the scope of the application as defined in the following claims, along with the full scope of equivalents to which such claims are entitled. It is to be understood that the application is defined by the appended claims and their equivalents.

Claims

1. A concentricity detection device for a steam turbine generator rotor, comprising a base (1), a driving structure (2), and a micrometer (3) arranged at the lower end of the driving structure (2), characterized in that: the top of the base (1) is provided with oppositely distributed support ends (22) and clamping chucks (23) at both ends, respectively, a driving module for rotor rotation is arranged on the support end (22), and the clamping chuck (23) is rotatably arranged on the base (1) for supporting the rotor of the generator in rotation; the number of the driving structure (2) is two groups, and the two groups of driving structures (2) are arranged on the closer side of the support end (22) and the clamping chuck (23), respectively, for automatic concentricity detection of the generator rotor.

2. The concentricity detection device for a steam turbine generator rotor according to claim 1, characterized by: A moving trolley (4) is longitudinally slidably arranged on the base (1) between the support end (22) and the clamping chuck (23), a main lifting mechanism (6) is vertically arranged on the top of the moving trolley (4), a pressure detection seat (8) is arranged on the top of the main lifting mechanism (6), two force rollers (20) of V-shaped distribution are rotatably arranged on the top of the pressure detection seat (8), and are used for side detection of the generator rotor.

3. The concentricity detection device for a steam turbine generator rotor according to claim 2, characterized by: The pressure detection seat (8) comprises a container box (9) and a plurality of detection supporting pieces (10) uniformly supported in the container box (9), the container box (9) comprises two upper and lower staggered box bodies, the box bodies are made of hard material, and are used for side detection of the generator rotor.

4. The concentricity detection device for a steam turbine generator rotor according to claim 3, characterized by: The detection supporting piece (10) comprises two oppositely distributed extrusion plugs (11) and the same spring (13) sleeved outside the two extrusion plugs (11), the same buffer tube (12) is penetratingly arranged outside the two extrusion plugs (11), the buffer cavities (14) for sliding of the extrusion plugs (11) are arranged at both ends of the buffer tube (12), the same folding detection cavity (15) is penetratingly arranged between the two buffer cavities (14), the wind speed sensor (17) is rotatably arranged in the folding detection cavity (15), and is used for detecting the deformation of the detection supporting piece (10).

5. The concentricity detection device for a steam turbine generator rotor according to claim 4, characterized by: Support pads (18) are arranged at the upper and lower ends of the two extrusion plugs (11), and the support pads (18) are connected with the two box bodies, respectively, the support pads (18) are made of rubber material, and the support pads (18) are provided with pressure sensors (19).

6. The concentricity detection device for a steam turbine generator rotor according to claim 5, characterized by: The axes of the force rollers (20) are perpendicular to the support end (22) and the clamping chuck (23), the same concentricity measuring end (21) is parallelly arranged at the middle part of the two force rollers (20), the lower end of the concentricity measuring end (21) is provided with a vice lifting mechanism (7) connected with the pressure detection seat (8) perpendicularly, and is used for concentricity detection of the generator rotor.

7. The concentricity detection device for a steam turbine generator rotor according to claim 1, characterized by: The driving module comprises a limiting arc-shaped seat (24) arranged close to the clamping chuck (23), horizontal limiting ends (25) horizontally penetrating through both sides of the limiting arc-shaped seat (24), a longitudinal jack (26) penetrating through the supporting end (22), a rotary driving end (27) horizontally arranged at the telescopic end of the longitudinal jack (26), a resisting end (28) arranged at the driving end of the rotary driving end (27), and a plurality of movable clamping claws slidingly arranged on the clamping chuck (23) and used for limiting and rotating the generator rotor.

8. The concentricity detection device for a steam turbine generator rotor according to claim 7, characterized by: A limiting plate (29) is arranged at the telescopic end of the horizontal limiting end (25), an inner groove is formed in the end of the limiting plate (29) away from the limiting arc-shaped seat (24), and a plurality of rolling balls (30) are rotatably arranged in the inner groove.

9. The concentricity detection device for a steam turbine generator rotor according to claim 8, characterized by: The limiting plate (29) is made of elastic material and has an arc-shaped structure, and the rotating shafts of the rolling balls (30) are parallel to the rotating shaft of the rotary driving end (27) and are used for limiting the rotation of the generator rotor.

10. A method for detecting concentricity of a turbogenerator rotor, using the turbogenerator rotor concentricity detection device according to any one of claims 1 to 9, characterized by, The method comprises the following steps: Step one: the assembled generator and rotor are simultaneously limited between the supporting end (22) and the clamping chuck (23) through the arrangement of the limiting arc-shaped seat (24) and the force roller (20), then the longitudinal jack (26) is used for longitudinal limiting of the generator and the rotor through the telescopic resisting end (28), the horizontal limiting end (25) is used for horizontal clamping of one end of the rotor through the telescopic two groups of oppositely distributed limiting plates (29), and then the movable clamping claws on the clamping chuck (23) are used for clamping the other end of the generator and the rotor through inward contraction; Step two: the two sides of the micrometer (3) are respectively attached to the two ends of the rotor through the length telescoping of the driving structure (2), the concentricity detection preparation of the end of the rotor is completed, then the two force rollers (20) are attached to the rotor through the length telescoping of the main lifting mechanism (6), the concentricity measuring end (21) is attached to the lower end surface of the rotor through the length telescoping of the auxiliary lifting mechanism (7), and the detection preparation of the concentricity and the curvature of the middle part of the rotor is completed; Step three: the generator rotor rotates around its axis as the rotating shaft through the rotary driving of the rotary driving end (27) and the rotary arrangement of the clamping chuck (23) on the top of the base (1) and the use of the rolling balls (30) in the limiting plate (29), the two micrometers (3) respectively detect the concentricity of the two ends of the rotor, the concentricity measuring end (21) detects the concentricity of the middle part of the rotor, the force roller (20) conducts force to the side wall of the generator rotor, the pressure detection seat (8) is extruded, a plurality of detection supporting pieces (10) detect the bending state of the side surface of the rotor, and the concentricity detection accuracy is improved. Step four: the moving trolley (4) slides along the base (1) longitudinally to realize detection coverage of different positions of the rotor axis; the main lifting mechanism (6) drives the pressure detection seat (8) to lift and lower, so that the stress roller (20) can adapt to the diameter change of the rotor and be attached; the auxiliary lifting mechanism (7) independently adjusts the height of the concentricity measurement end (21) to ensure that it is in precise contact with the surface of the rotor, and the three work together to realize the concentricity detection of the full length and multiple sections of the rotor.

Images