CN115163226A - Rotor positioning device and positioning method for steam turbine assembly - Google Patents

Abstract

The invention relates to a rotor positioning device and a positioning method for steam turbine assembly, belonging to the technical field of steam turbines. There are movable brackets on the ground on both sides of the stator and the stator. One of the movable brackets is provided with a laser displacement locator, and the other movable bracket is provided with a servo motor with a PLC controller, a shaft and a thrust plate. The invention constructs a set of rotor flow distance measurement and thrust positioning system in the steam turbine assembly process. The laser displacement locator is mainly used as the measurement unit, and the difference between the measured axial displacement and the designed displacement is used as the input signal, and then driven by the PLC controller. The servo motor drives the thrust plate to precisely position the turbine rotor in the axial direction. The advantage over traditional manual assembly methods is that it is faster, more precise and less labor-intensive to assemble the rotor during final assembly.

Description

Rotor positioning device and positioning method for steam turbine assembly

technical field

The invention relates to a rotor positioning device and a positioning method for steam turbine assembly, belonging to the technical field of steam turbines.

Background technique

As a precision equipment assembled from thousands of parts, the quality of the steam turbine directly affects the stability and safety of its subsequent operation. Therefore, the steam turbine will be assembled before leaving the factory to check its assembly quality, and then split into parts. Parts are sent to the site. After the equipment is delivered to the site, the secondary assembly will be carried out on site. After this assembly, it will be put into use. After several cycles of operation, it will be followed by maintenance, disassembly and reassembly. Therefore, how to improve the final assembly quality and assembly speed of steam turbines has always been a technical problem that equipment manufacturers and on-site assembly teams want to solve. The traditional assembly method requires manual manual measurement of the axial flow gap between the rotor and the cylinder, lifting, positioning, and then iterating this process repeatedly until it is properly adjusted. The traditional process is time-consuming and requires high technical requirements for assembly workers.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the deficiencies in the prior art, and to provide a rotor positioning device and a positioning method for steam turbine assembly, which are faster, more accurate, and more labor-saving to assemble the rotor.

The present invention is achieved through the following technical solutions:

That is, a rotor positioning device for the general assembly of a steam turbine, including a traveling vehicle, the steam turbine rotor and blades are hoisted by steel cables, the steam turbine cylinder block and the stator are located directly below the steam turbine rotor and the blades, and movable Supports, one of the movable supports is provided with a laser displacement locator, and the other movable support is provided with a servo motor with a PLC controller, a shaft and a thrust plate.

A further improvement of the present invention is that the laser displacement positioner and the servo motor with PLC controller are connected through a signal feedback cable.

The present invention also provides a method for positioning the rotor for steam turbine assembly, comprising the following steps:

S1: Fixation of the movable bracket on the steam outlet side of the steam turbine: move the movable bracket to the steam outlet side of the steam turbine cylinder, and initially fix and position the pulley at the bottom of the movable bracket;

S2: Fasten the laser displacement locator by magnetic force or bolts, so that the height of the laser beam is higher than the steam turbine cylinder block and stator;

S3: Fixing of the movable bracket on the steam inlet side of the steam turbine: The fixing method of the movable bracket on this side is similar to the positioning method of the movable bracket on the steam outlet side. According to the coaxial principle of the two movable brackets and the rotor, the steam outlet The side movable bracket is connected to the side end of the steam turbine cylinder block and the stator, and the vertical end face of the movable bracket is further adjusted to be parallel to the rotor end face through the dial indicator, and the pulley at the bottom end of the movable bracket is fastened. The servo motor, shaft and thrust plate are respectively fastened on the movable bracket;

S4: Wiring and testing: Connect the laser displacement locator to the servo motor with PLC controller with a signal feedback cable, and then test the measurement function of the laser displacement locator and the action of the servo motor with PLC controller;

S5: Measurement and calculation: First, lift the rotor by driving, and drop it to the height position where the laser displacement locator laser can hit the end face of the rotor, and preliminarily locate the position of the suspended rotor according to the size requirements of the assembly drawing.

S6: Signal input and thrust positioning: On the basis of step S5, the rotor is hoisted, and the displacement difference is input into the PLC controller to make the thrust plate move axially to drive the axial displacement of the rotor, and finally the laser displacement locator gives the final result. After the position signal, the servo motor stops the axial force applied to the thrust plate, and the rotor drops again when the vehicle is driven, and the flow gap between the impeller and the partition plate of the first or two-stage rotor is measured and checked, and it meets the design requirements of the drawing, that is, the operation of dropping the rotor is completed.

The positioning device of the invention constructs a set of rotor flow distance measurement and thrust positioning system in the steam turbine assembly process. The laser displacement positioner is mainly used as the measurement unit, and the difference between the axial measured displacement and the designed displacement is used as the input signal, and then controlled by PLC The servo motor drives the thrust plate to precisely position the turbine rotor in the axial direction. The advantage over traditional manual assembly methods is that it is faster, more precise and less labor-intensive to assemble the rotor during final assembly.

A further improvement of the present invention is that the method for preliminary positioning of the suspended rotor in step S5 is specifically: inputting a position signal through the PLC controller, letting the servo motor drive the thrust plate to move in the horizontal direction, dropping the rotor, measuring the rotor and the stator diaphragm According to the collected gap between the moving impeller and the partition plate of each stage, the most reasonable axial adjustment displacement of the rotor is calculated.

A further improvement of the present invention also includes the following steps after step S6: theoretically, all the parts of the steam turbine are normally processed according to the drawings. To meet the system flow design requirements.

A further improvement of the present invention is that, if a problem is found in the measurement and calculation in step S4, step S6 is suspended, and the clapboard that needs to be repaired is hoisted out by a crane, and then re-hoisted after repairing, and then follow step S6 Complete the rotor assembly.

A further improvement of the present invention is that in step S2, after the laser displacement locator is fastened by magnetic force or bolts, the movable bracket is further positioned with a dial indicator to ensure that the movable bracket is perpendicular to the ground, that is, the laser The positioning surface of the displacement positioner is in a parallel state with the steam turbine cylinder body, which ensures that the laser beam and the rotor end face maintain a vertical relationship during assembly, and finally the movable bracket is completely fastened.

A further improvement of the present invention is that, in step S3, after moving the movable bracket on the steam outlet side to the side end of the steam turbine cylinder block and the stator, the vertical end face of the movable bracket is further adjusted to be parallel to the end face of the rotor through the dial indicator. The pulley at the bottom of the movable bracket is fastened, and finally the servo motor with PLC controller, the shaft and the thrust plate are respectively fastened on the movable bracket.

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

The positioning device of the invention constructs a set of rotor flow distance measurement and thrust positioning system in the steam turbine assembly process. The laser displacement positioner is mainly used as the measurement unit, and the difference between the axial measured displacement and the designed displacement is used as the input signal, and then controlled by PLC The servo motor drives the thrust plate to precisely position the turbine rotor in the axial direction. The advantage over traditional manual assembly methods is that it is faster, more precise and less labor-intensive to assemble the rotor during final assembly.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the accompanying drawings required in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, which are not relevant to ordinary skills in the art. As far as personnel are concerned, other drawings can also be obtained from these drawings on the premise of no creative work.

FIG. 1 is a schematic structural diagram of a specific embodiment of the present invention.

In the figure: 1. Steam turbine cylinder block and stator; 2. Steam turbine rotor and blades; 3. Movable bracket; 4. Laser displacement positioner; 5. Servo motor with PLC controller; 6. Shaft; 7. Thrust plate; 8. Steel cable; 9. Driving; 10. Signal feedback cable.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

As shown in FIG. 1, a rotor positioning device for steam turbine assembly includes a crane 9. The crane 9 hoists the steam turbine rotor and blades 2 through steel cables 8. The steam turbine cylinder block and the stator 1 are located directly below the steam turbine rotor and the blades 2. The steam turbine cylinder There are movable brackets 3 on the ground on both sides of the body and the stator 1. One of the movable brackets 3 is provided with a laser displacement positioner 4, and the other movable bracket 3 is provided with a servo motor 5 and a shaft 6 with a PLC controller. And the thrust plate 7, the laser displacement positioner 4 and the servo motor 5 with the PLC controller are connected through the signal feedback cable 10.

The present invention also provides a method for positioning the rotor for steam turbine assembly, comprising the following steps:

S1: Fixation of the movable bracket on the steam outlet side of the steam turbine: move the movable bracket 3 to the steam outlet side of the steam turbine cylinder, and preliminarily fix and position the pulley at the bottom of the movable bracket 3 at a suitable position;

S2: Fasten the laser displacement positioner 4 at a suitable height by magnetic force or bolts, so that the height of the laser beam is higher than the steam turbine cylinder block and the stator 1, and use a dial indicator to further position the movable bracket 3 to ensure that it can move The bracket 3 is perpendicular to the ground, that is, the positioning surface of the laser displacement positioner 4 is in a parallel state with the cylinder block of the steam turbine, so as to ensure the vertical relationship between the laser beam and the rotor end face during assembly, and finally the movable bracket 3 is completely fastened. If necessary Auxiliary tightening can be implemented according to site conditions;

S3: Fixing of the movable bracket on the steam inlet side of the steam turbine: The fixing method of the movable bracket 3 on this side is similar to the positioning method of the movable bracket 3 on the steam outlet side. According to the coaxial principle of the two movable brackets 3 and the rotor, Move the movable bracket 3 on the steam outlet side to the side end of the steam turbine cylinder block and the stator 1, and further adjust the vertical end face of the movable bracket 3 to be parallel to the end face of the rotor through the dial indicator. Tighten the pulley at the bottom of the movable bracket 3 and make necessary adjustments. The additional tightening work is carried out, and finally the servo motor 5, the shaft 6 and the thrust plate 7 with the PLC controller are respectively tightened on the movable bracket 3;

S4: Wiring and testing: Use the signal feedback cable 10 to connect the laser displacement positioner 4 with the servo motor 5 with PLC controller, and then test the measurement function of the laser displacement positioner 4 and the servo motor 5 with PLC controller. actions;

S5: Measurement and calculation: First, hoist the rotor by traveling 9, and drop it to the height position where laser displacement locator 4 can reach the end face of the rotor. According to the size requirements of the assembly drawings, the position of the suspended rotor is initially positioned. The initial positioning method is as follows: Input the position signal through the PLC controller, let the servo motor drive the thrust plate 7 to move in the horizontal direction, drop the rotor, and measure the axial flow gap between the rotor and the stator diaphragm. , calculate the most reasonable rotor axial adjustment displacement;

S6: Signal input and thrust positioning: On the basis of step S5, the rotor is hoisted, and the displacement difference is input into the PLC controller to make the thrust plate 7 move axially to drive the axial displacement of the rotor. After the final position signal is output, the servo motor stops the axial force applied to the thrust plate 7, and the traverse 9 drops the rotor again to measure and correct the flow gap between the impeller and the partition plate of the one-stage or two-stage rotor. For the operation of the rotor, in theory, all the parts of the steam turbine are processed normally according to the drawings, and there is no need to grind the diaphragm, and in the final assembly of the steam turbine, the axial flow gap between the rotor and the stator can be adjusted in one step, but in actual operation, It may be due to processing or other problems, and the steam seal of the separator should be ground to meet the design requirements of the system flow.

S7: If a problem is found in the measurement and calculation in step S4, then suspend step S6, use the crane 9 to hoist out the partition that needs to be ground, and re-hoist it after grinding, and then complete the assembly of the rotor according to step S6 .

The positioning device of the invention constructs a set of rotor flow distance measurement and thrust positioning system in the steam turbine assembly process. The laser displacement positioner is mainly used as the measurement unit, and the difference between the axial measured displacement and the designed displacement is used as the input signal, and then controlled by PLC The servo motor drives the thrust plate 7 to precisely position the turbine rotor in the axial direction. The advantage over traditional manual assembly methods is that it is faster, more precise and less labor-intensive to assemble the rotor during final assembly.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments may be referred to each other.

The terms "upper", "lower", "outside", "inside", etc. in the description and claims of the present invention and the above-mentioned drawings, if present, are used to distinguish the relative relationship in position, and are not necessarily qualitative. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A rotor positioning device for steam turbine assembly, characterized in that it comprises a traveling vehicle (9), and the traveling vehicle (9) hoists a steam turbine rotor and a blade (2) by a steel cable (8), and the steam turbine cylinder block and the stator (1) are located in the steam turbine. Immediately below the rotor and the blades (2), movable brackets (3) are arranged on the ground on both sides of the steam turbine cylinder block and the stator (1), and a laser displacement locator (4) is arranged on one of the movable brackets (3). Another movable bracket (3) is provided with a servo motor (5) with a PLC controller, a shaft (6) and a thrust plate (7). 2. The rotor positioning device for steam turbine assembly according to claim 1, wherein a signal feedback cable (10) is passed between the laser displacement positioner (4) and the servo motor (5) with a PLC controller. ) are connected. 3. A method for positioning a rotor for general assembly of a steam turbine, wherein the positioning device according to claim 1 or 2 is used to position the rotor of the steam turbine, comprising the following steps: S1: Fixing of the movable bracket on the steam outlet side of the steam turbine: move the movable bracket (3) to the steam outlet side of the steam turbine cylinder block, and preliminarily fix and position the pulley at the bottom of the movable bracket (3); S2: Fasten the laser displacement positioner (4) by magnetic force or bolts, so that the height of the laser beam is higher than the steam turbine cylinder block and the stator (1); S3: Fixing of the movable bracket on the steam inlet side of the steam turbine: the fixing method of the movable bracket (3) on this side is similar to the positioning method of the movable bracket (3) on the steam outlet side. According to the coaxial principle of the rotor, move the movable bracket (3) on the steam outlet side to the side end of the steam turbine cylinder block and the stator (1). The pulley at the bottom end of the movable bracket (3) is fastened, and finally the servo motor (5) with the PLC controller, the shaft (6) and the thrust plate (7) are respectively fastened on the movable bracket (3); S4: Wiring and testing: Use the signal feedback cable (10) to connect the laser displacement positioner (4) with the servo motor (5) with a PLC controller, and then test the measurement function of the laser displacement positioner (4) and The action of the servo motor (5) with PLC controller; S5: Measurement and calculation: First, lift the rotor by driving (9), and drop it to the height position where the laser can hit the end face of the rotor by the laser displacement locator (4). According to the size requirements of the assembly drawing, the position of the suspended rotor is initially positioned; S6: Signal input and thrust positioning: On the basis of step S5, the rotor is hoisted, and the displacement difference is input into the PLC controller to make the thrust plate (7) move axially to drive the axial displacement of the rotor. (4) After the final position signal is given, the servo motor stops the axial force to the thrust plate (7), and the driving (9) drops the rotor again, and measures the flow gap between the impeller and the partition plate of the one- or two-stage rotor. In line with the design requirements of the drawings, the operation of the drop rotor is completed. 4. the positioning method of a kind of rotor for steam turbine assembly according to claim 3, it is characterized in that, in described step S5, the method for preliminary positioning of suspended rotor is specifically: input position signal by PLC controller, let servo motor drive The thrust plate (7) moves in the horizontal direction, drops the rotor, measures the axial flow clearance between the rotor and the stator diaphragm, and calculates the most reasonable axial adjustment of the rotor according to the collected clearance between the moving impeller and the diaphragm at each stage. displacement. 5. the positioning method of a kind of steam turbine assembly rotor according to claim 3, is characterized in that, also comprises the following steps after step S6: in theory, all parts of steam turbine are normally processed according to drawings, when processing or other When there is a problem, repair the steam seal of the separator to meet the design requirements of the system flow. 6. the positioning method of the rotor for a kind of steam turbine assembly according to claim 5, is characterized in that, as found problem in the measurement and calculation in step S4, suspend step S6, will need to be ground with traveling (9) The baffle is lifted out, re-hoisted after grinding, and then the rotor assembly is completed according to step S6. 7. The method for positioning a rotor for steam turbine assembly according to claim 3, wherein in step S2, after the laser displacement locator (4) is fastened by magnetic force or bolts, a dial indicator is used The movable bracket (3) is further positioned to ensure that the movable bracket (3) is perpendicular to the ground, that is, the positioning surface of the laser displacement locator (4) is in a parallel state with the cylinder block of the steam turbine, so as to ensure that the laser beam and the rotor end face are in the same state during assembly. Keep the vertical relationship between them, and finally tighten the movable bracket (3) completely. 8. The method for positioning a rotor for steam turbine assembly according to claim 3, wherein in step S3, the movable bracket (3) on the steam outlet side is moved to the side end of the steam turbine cylinder block and the stator (1). Then, further adjust the vertical end face of the movable bracket (3) to be parallel to the end face of the rotor through the dial indicator, fasten the pulley at the bottom of the movable bracket (3), and finally connect the servo motor (5) with the PLC controller. , the shaft (6) and the thrust plate (7) are respectively fastened on the movable bracket (3).

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