Digital steam turbine general assembly centering tool and operation method

Abstract

The invention relates to a digital steam turbine general assembly centering tool and an operation method, and belongs to the technical field of steam turbine debugging equipment, the digital steam turbine general assembly centering tool comprises a dummy shaft body, adjustable static pressure supports are arranged at the two ends of the dummy shaft body respectively, and a plurality of adjustable measuring arms extending towards the outer side of the dummy shaft body are arranged on the dummy shaft body between the two adjustable static pressure supports; a displacement sensor is arranged at the end part, far away from the dummy shaft body, of the adjustable measuring arm; and the displacement sensor is connected with a display device through a cable. The length of the adjustable measuring arm is determined according to the size from the outer edge to the axis of the steam turbine component, multiple measuring points can be measured at the same time, the installation position of the displacement sensor is closer to the measuring precision in the radial direction, scientific fixed-point continuous measurement is formed, the uncertainty of visual observation is avoided, and the measuring precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbine debugging equipment, in particular to a digital steam turbine assembly centering tool and an operating method. Background Art

[0002] The main purpose of turbine centering is to keep the deviation of the center of the moving and static parts in line with the specified radial clearance, ensure the reasonable load distribution of each bearing, and ultimately ensure that the vibration index of the unit is qualified. ‌By centering, it can be ensured that the center deviation of the rotating and static parts of the turbine does not exceed the specified value during operation, thereby ensuring that the radial clearance of the moving and static parts is within the allowable range and avoiding collisions during operation. By centering, it can be ensured that the load distribution of each bearing meets the design requirements and avoids vibration and damage caused by uneven load. By connecting the center lines of each rotor into a continuous curve, periodic alternating forces on the bearings are avoided, thereby reducing vibration and ensuring the stability and safety of the unit operation.

[0003] In the prior art, a dummy shaft and a dummy bearing are usually used in conjunction with a measuring tool for final assembly centering (e.g. Figure 1 as shown); or use steel wire for final assembly centering (such as Figure 2 As shown). However, there are the following disadvantages: 1. The ellipticity and taper of the dummy shaft have a great influence on the measurement results, and the manufacturing accuracy of the dummy shaft itself is relatively high; 2. The dummy shaft centering is measured in a half-cylinder state, which cannot truly reflect the influence of the deformation of each component on the center; 3. The dummy shaft centering is mostly measured manually using a rod-type internal diameter micrometer. The subjectivity of people and the instability of naked eye observation reduce the accuracy of the dummy shaft centering; 4. The measurement points for the dummy shaft centering are random and the number is very limited, which makes it difficult to truly reflect the position of the centering components; 5. When using wire assembly centering, it is necessary to compensate for the deflection of the wire, but the deflection of the wire is difficult to measure accurately, so it is generally only used for rough centering. Summary of the invention

[0004] In order to solve the problem of poor measurement accuracy of existing centering tools, the present invention provides a digital steam turbine assembly centering tool and an operating method.

[0005] The present invention is achieved through the following technical solutions: A digital steam turbine assembly centering tool and operating method, comprising a dummy shaft body, wherein adjustable static pressure supports are respectively provided at both ends of the dummy shaft body, a plurality of adjustable measuring arms extending toward the outside of the dummy shaft body are provided on the dummy shaft body between the two adjustable static pressure supports, and a displacement sensor is provided at the end of the adjustable measuring arm away from the dummy shaft body; the displacement sensor is connected to a display device via a cable.

[0006] The length of the adjustable measuring arm is determined according to the size from the outer edge of the turbine component to the axis center. Multiple measuring points can be measured simultaneously, and the installation position of the displacement sensor is closer to the radial measurement accuracy, forming a scientific fixed-point continuous measurement, avoiding the uncertainty of naked eye observation, and improving the measurement accuracy.

[0007] A further improvement of the present invention is that a hub and a data line are provided between the cable and the display device, wherein the hub is provided at the end of the cable; one end of the data line is connected to the display device, and the other end is connected to the hub.

[0008] A further improvement of the present invention is that a data interface box is provided on the data line.

[0009] A further improvement of the present invention is that the above-mentioned adjustable measuring arm coincides with a radial extension line of the dummy shaft body.

[0010] A further improvement of the present invention is that a supporting side arm is provided on one side of the adjustable measuring arm, one end of the supporting side arm is connected to the dummy shaft body, and the other end of the supporting side arm is connected to the adjustable measuring arm.

[0011] A further improvement of the present invention is that the displacement sensor is mounted on the adjustable measuring arm via a sensor fixing seat.

[0012] An operating method of a digital steam turbine assembly centering tool comprises the following steps: S1. Install the dummy shaft body on the adjustable static pressure support; S2. Determine a measuring point on the dummy shaft body and install an adjustable measuring arm at the measuring point; S3. Install a displacement sensor at the free end of the measuring arm; S4. Connect a cable between the displacement sensor and the display device.

[0013] A further improvement of the present invention is that the adjustable measuring arm is pre-installed on a tightening belt at one end close to the dummy shaft body, and then the tightening belt is installed on the measuring point of the dummy shaft body.

[0014] A further improvement of the present invention is that the length of the adjustable measuring arm is determined according to the radial distance from the outer edge of the steam turbine component to be measured to the axis.

[0015] It can be seen from the above technical scheme that the beneficial effects of the present invention are: the length of the adjustable measuring arm is determined according to the size from the outer edge of the turbine component to the axis center, multiple measuring points can be measured at the same time, and the installation position of the displacement sensor is closer to the radial measurement accuracy, forming a scientific fixed-point continuous measurement, avoiding the uncertainty of naked eye observation, and improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a measuring tool 1 in the prior art.

[0018] Figure 2 It is a structural schematic diagram of a second measuring tool in the prior art.

[0019] Figure 3 It is a schematic diagram of a specific embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the combination of an adjustable measuring arm and a supporting side arm according to a specific embodiment of the present invention.

[0021] Figure 5 This is a first schematic diagram of a sensor fixture according to a specific embodiment of the present invention.

[0022] Figure 6 This is a second schematic diagram of a sensor fixture according to a specific embodiment of the present invention.

[0023] In the attached drawings: 1. adjustable measuring arm; 2. supporting side arm; 3. displacement sensor; 4. dummy shaft body; 5. adjustable static pressure support; 6. cable; 7. hub; 8. data cable; 9. data interface box; 10. display device; 11. sensor fixture; 12. clamping slot one; 13. clamping slot two. DETAILED DESCRIPTION

[0024] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0025] As attached Figure 3-6As shown, a digital steam turbine assembly centering tool and operation method include a dummy shaft body 4, with adjustable static pressure supports 5 provided at both ends of the dummy shaft body 4, and a plurality of adjustable measuring arms 1 extending outward from the dummy shaft body 4 provided on the dummy shaft body 4 between the two adjustable static pressure supports 5, wherein the adjustable measuring arms 1 coincide with the radial extension lines of the dummy shaft body 4. A displacement sensor 3 is provided at the end of the adjustable measuring arm 1 away from the dummy shaft body 4; the displacement sensor 3 is mounted on the adjustable measuring arm 1 through a sensor fixing seat.

[0026] A supporting side arm 2 is provided on one side of the adjustable measuring arm 1 , one end of the supporting side arm 2 is connected to the dummy shaft body 4 , and the other end is connected to the adjustable measuring arm 1 .

[0027] The displacement sensor 3 is connected to the display device 10 via a cable 6; a hub 7 and a data cable 8 are provided between the cable 6 and the display device 10, and the hub 7 is provided at the end of the cable 6; one end of the data cable 8 is connected to the display device 10, and the other end is connected to the hub 7; a data interface box 9 is provided on the data cable 8.

[0028] The cable 6 enters the interior of the dummy shaft body 4 through one end of the dummy shaft body 4 , passes through a reserved hole adjacent to the measuring point, and is connected to the displacement sensor 3 .

[0029] The digital characteristics of the centering tool realize the transition of the measurement process from the half-cylinder state to the full-cylinder state, which can more realistically reflect the position of the centering components after assembly and also realize the non-rotor assembly requirements of some units.

[0030] The measurement during the rotation of the dummy shaft body 4 realizes the data collection of the whole week, solves the problem of random and very limited point selection, can more truly and effectively reflect the position of the centering component, and also reduces the influence of partial static deflection.

[0031] The displacement sensor 3 adopts a high-precision Marposs sensor and uses a data conversion, transmission and display device 10 for measurement, realizing the transformation of measurement from manual to automatic, eliminating the influence of human subjectivity and the instability of naked eye observation.

[0032] The automation of data collection and the real-time display of data enable measurement and workpiece position adjustment to be performed simultaneously. The adjustment effect can be displayed in real time in the device, making the centering process smoother and more convenient.

[0033] The design and fixation of the adjustable measuring arm 1 enables the required size to be precisely adjusted in the radial direction and the required position to be freely selected in the axial direction, which effectively increases the use range of the digital centering tool.

[0034] The measurement method of fixing the sensor 3 on the dummy shaft body 4 and then rotating the dummy shaft body 4 is equivalent to the situation at various angles during the rotation of a certain point on the rotor, which is closer to the actual working state of the rotor and also reduces the requirements on the manufacturing accuracy of the dummy shaft body 4.

[0035] An operating method of a digital steam turbine assembly centering tool comprises the following steps: S1, installing the dummy shaft body 4 on the adjustable static pressure support 5; S2, determining a measuring point on the dummy shaft body 4 and installing the adjustable measuring arm 1 at the measuring point; S3, installing a displacement sensor 3 at the free end of the measuring arm; S4. Connect the cable 6 between the displacement sensor 3 and the display device 10.

[0036] The adjustable measuring arm 1 is pre-installed on a tightening belt at one end close to the dummy shaft body 4, and then the tightening belt is installed on the measuring point of the dummy shaft body 4; the length of the adjustable measuring arm 1 is determined according to the radial distance from the outer edge of the turbine component to be measured to the axis center.

[0037] One end of the supporting side arm 2 is fixed to the dummy shaft body 4 through another tightening belt, and the supporting side arm 2 is hingedly connected to the tightening belt, and the other end is hingedly connected to the middle and upper part of the adjustable measuring arm 1. When the adjustable measuring arm 1 is long, the supporting side arm 2 can be added to improve the stability of the adjustable measuring arm 1.

[0038] The displacement sensor 3 is installed on the top of the adjustable measuring arm 1 through a sensor fixture 11; the sensor fixture 11 is bolted to the adjustable measuring arm 1, and the sensor fixture 11 is provided with a clamping groove 12 capable of accommodating the adjustable measuring arm 1, and a notch connecting the inside and outside of the clamping groove 12 is opened on the sensor fixture 11, and screw holes are opened on the sensor fixture 11 on both sides of the notch, and bolt fasteners are passed through the screw holes to clamp and fix the adjustable measuring arm 1 in the clamping groove 12, thereby completing the installation of the sensor fixture 11 on the upper end of the adjustable measuring arm 1.

[0039] The sensor fixture 11 is provided with a clamping groove 13 capable of accommodating the displacement sensor 3. The sensor fixture 11 is provided with a notch connecting the inside and outside of the clamping groove 13. The sensor fixture 11 is provided with screw holes on both sides of the notch. Bolt fasteners pass through the screw holes to clamp and fix the displacement sensor 3 in the clamping groove, thereby ensuring the firmness of the displacement sensor 3 during the measurement process.

[0040] The digital steam turbine assembly centering tool and operating method described in the present invention determine the length of the adjustable measuring arm according to the size from the outer edge of the steam turbine component to the axis center, can measure multiple measuring points at the same time, and the installation position of the displacement sensor is closer to the measurement accuracy in the radial direction, forming a scientific fixed-point continuous measurement, avoiding the uncertainty of naked eye observation, and improving the measurement accuracy.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0042] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A digital steam turbine assembly centering tool and an operating method, comprising a dummy shaft body (4), characterized in that: Adjustable static pressure supports (5) are respectively provided at both ends of the dummy shaft body (4); a plurality of adjustable measuring arms (1) extending toward the outside of the dummy shaft body (4) are provided on the dummy shaft body (4) between the two adjustable static pressure supports (5); and a displacement sensor (3) is provided at the end of the adjustable measuring arm (1) away from the dummy shaft body (4); the displacement sensor (3) is connected to a display device (10) via a cable (6).

2. A digital steam turbine assembly centering tool and operation method according to claim 1, characterized in that: A hub (7) and a data cable (8) are also provided between the cable (6) and the display device (10); the hub (7) is provided at the end of the cable (6); one end of the data cable (8) is connected to the display device (10), and the other end is connected to the hub (7).

3. A digital steam turbine assembly centering tool and operation method according to claim 2, characterized in that: A data interface box (9) is provided on the data line (8).

4. A digital steam turbine assembly centering tool and operating method according to any one of claims 1 to 3, characterized in that: The adjustable measuring arm (1) coincides with a radial extension line of the dummy shaft body (4).

5. A digital steam turbine assembly centering tool and operation method according to claim 4, characterized in that: A supporting side arm (2) is provided on one side of the adjustable measuring arm (1); one end of the supporting side arm (2) is connected to the dummy shaft body (4), and the other end is connected to the adjustable measuring arm (1).

6. A digital steam turbine assembly centering tool and operation method according to claim 5, characterized in that: The displacement sensor (3) is mounted on the adjustable measuring arm (1) via a sensor fixing seat.

7. An operating method of a digital steam turbine assembly centering tool as claimed in claim 6, characterized in that: The following steps are involved: S1. Installing a dummy shaft body (4) on an adjustable static pressure support (5); S2. Determining a measuring point on the dummy shaft body (4) and installing an adjustable measuring arm (1) at the measuring point; S3. Installing a displacement sensor (3) at the free end of the measuring arm; S4. Connecting a cable (6) between the displacement sensor (3) and a display device (10).

8. The method for operating a digital steam turbine assembly centering tool according to claim (7), characterized in that: One end of the adjustable measuring arm (1) close to the dummy shaft body (4) is pre-installed on a tightening belt, and then the tightening belt is installed on the measuring point of the dummy shaft body (4).

9. The method for operating a digital steam turbine assembly centering tool according to claim 8, characterized in that: The length of the adjustable measuring arm (1) is determined according to the radial distance from the outer edge of the steam turbine component to be measured to the axis.

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