JP2006060979A - Centering method and apparatus for rotating body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centering method and an apparatus of a rotating body for quickly and efficiently implementing a centering work, without high cost or large space, and improving the measurement accuracy for centering. <P>SOLUTION: The centering apparatus 10 is placed and fixed with bolts so as to have the center of a rotational pedestal 12 coincide with the center of the upper face of a rotor 54 that conducts centering. A measurement arm 14 is stably held on the rotational pedestal 12 in a horizontal state, has a plumb bob suspended at its tip. and is installed rotatably at the center of the rotational pedestal 12 by a rotation means 18. Accordingly, the measurement arm 14 is rotated, until the position of the plumb bob reaches a position for measuring the rotor 54, the distance from the plumb bob 16 to the rotor 54 is measured at each measurement position, measurement values measured in measurement positions are converted, and the rotor 54 is centered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating body centering method and apparatus, and more particularly, to a rotating body centering method and apparatus for accurately aligning a large rotating body such as assembling a rotor in a generator.

  Conventionally, centering a large rotating body is done by first setting up a center pole at the upper center of the rotating body and installing a stand with a measuring arm with a downward swing on the outside of the rotating body. Measure, check and adjust the distance to the center pole. Next, it is common to measure the distance from the outer peripheral surface of the rotating body to the downward swing and convert the eccentricity.

Further, as in Patent Document 1, a projection is provided at the center of the centering plate, a center hole is drilled in the end surface of the centering shaft, and then the projection of the centering plate is engaged with the center hole. There is also a method of performing centering by attracting a magnet between the centering plate and the rotating body.
JP-A-61-133802

  However, in the conventional centering, the setup needs to be changed for each measurement point of the rotating body, so that the work efficiency is poor, and when the diameter of the rotating body is large, the centering work requires much manpower. In addition, there are drawbacks such as a large measurement error in centering and a deterioration in quality.

  Moreover, in the centering of patent document 1, centering with respect to the rotating shaft of a rotating body is performed, and it is difficult to center with respect to a large rotating body. Moreover, there is no description about the direction of rotation of the centering plate, which requires an exact rotation.

  The present invention has been made in view of such circumstances, and in particular, a rotation that can perform centering work efficiently in a short time and can improve the measurement accuracy of centering without requiring much cost and space. An object of the present invention is to provide a body centering method and apparatus.

  According to a first aspect of the present invention, there is provided a rotating body centering method for centering a rotating body having a columnar shape or a cylindrical shape, in order to achieve the above object. And measuring the distance from the downward swing to each part of the rotating body by rotating the measuring arm with the upper center of the rotating body as the rotation center on the same axis as the rotation center of the rotating body. The rotating body is centered.

  According to a third aspect of the present invention, there is provided a rotating body centering device for centering a rotating body having a columnar shape or a cylindrical shape, and a rotating pedestal attached to an upper center of the rotating body, and a rotating base. A measuring arm provided with a downward swing at the tip of the arm provided, and the measuring arm is rotated on the rotating base so that the measuring arm rotates coaxially with the rotation center of the rotating body. And a rotation mechanism.

  According to the present invention, as the centering operation of the rotating body, first, the center of the rotating pedestal is placed at the upper center of the rotating body so as to be coaxial with the rotating center of the rotating body, and rotated on the rotating base. A free measuring arm is rotated to a predetermined position by a rotating mechanism. Next, the downward swing attached to the tip of the measuring arm is suspended to measure the distance from the downward swing to the location where the rotating body is centered, and the eccentricity of the rotating body is determined from the measured distance. By converting, the rotating body is centered. As described above, since the measurement arm that rotates coaxially with the rotation center of the rotating body can be rotated to a predetermined position, the time and labor required for measuring the centering of the rotating body can be greatly reduced. be able to. In addition, since the measuring arm is connected so as to stably rotate on the rotating base by the rotating mechanism, the distance from the axis of the rotating body to the swing down can be accurately measured. Further, if the measuring arm is rotated to a predetermined position by the rotation mechanism and the distance from the swinging down to the inner peripheral surface of the rotating body is measured, the inner periphery side of the rotating body can be centered.

  Thus, by employing the present invention, the centering operation for the inner and outer circumferences of the rotating body can be accurately performed in a short time. In addition, since many devices and members are not used, the equipment cost required for centering can be reduced. Furthermore, since it can be detachably installed at the upper center of the rotating body, the space required for centering can also be reduced.

  The invention according to claim 2 is characterized in that the distance measurement according to claim 1 is performed in a state in which a weight attached to the tip of the downward swing is immersed in oil.

  The invention described in claim 5 is characterized in that it comprises swing preventing means for preventing the swing of the downward swing when the measuring arm of claim 3 or 4 is moved.

  According to the second and fifth aspects, when the measuring arm is rotated, the weight of the swinging swing is swayed by the centrifugal force, so that the centering cannot be accurately performed until the swaying stops. In the present invention, vibration preventing means is provided so that the centering weight is immersed in the oil. As a result, the subtle swing of the downward swing caused by the movement of the measuring arm can be absorbed by the viscosity of the oil, so that the centering measurement can be performed more accurately.

  According to a fourth aspect of the present invention, there is provided the rotating mechanism according to the third aspect, wherein the rotating mechanism is provided on the pedestal for rotation, has a disk-like flange having a center coaxial with the rotation center of the rotating body, Rotating means provided below the arm and having a roller unit including three rollers that contact the upper surface, the lower surface, and the side surface of the flange, arranged at equal intervals around the flange. It is characterized by that.

  According to the fourth aspect of the present invention, the rotation mechanism is a rotation in which a disk-shaped flange is provided on the rotation base, and at least three roller units including three rollers in contact with the upper surface, the lower surface, and the side surface of the flange are arranged. By providing the means on the lower surface of the measuring arm, the measuring arm is rotated on the rotating base. As a result, the measuring arm is stably supported at least at three points by the rotating means with respect to the three surfaces of the disk-shaped flange having the center coaxial with the rotation center of the rotating body provided on the rotation base. Therefore, the measurement arm can be smoothly rotated without reducing the measurement accuracy of the centering of the rotating body.

  As described above, according to the centering device for a rotating body according to the present invention, the rotating base is installed at the upper center of the rotating body and the rotating arm is rotated. Centering work can be performed easily and accurately. Moreover, since it is comprised with a simple apparatus and member and only the upper surface and outer periphery vicinity of a rotary body is used for a measurement, the cost and space which a centering operation | work of a rotary body requires can be reduced.

  Preferred embodiments of a rotating body centering method and apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing a configuration of a rotating body centering device 10 according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a part of the centering device 10 and shows a connection state between the rotation base 12 and the rotation means 18.

  As shown in FIG. 1, the centering device 10 mainly includes a rotation base 12, a measurement arm 14, a downward swing 16, and a rotation means 18.

  As shown in FIG. 2, the rotating pedestal 12 is a pedestal having a flange shape at the top and bottom, and the upper flange 12 a is connected to the measuring arm 14 via a rotating means 18. On the other hand, the lower flange 12b is provided with a plurality of fixing members 20, 20. Bolt holes 20a, 20a ... are formed in the fixing members 20, 20 ..., and the centering device 10 can be stably installed by fixing the bolts through the bolt holes 20a, 20a .... .

  As shown in FIG. 1, the measurement arm 14 is a square member installed horizontally on the rotation base 12, and a center pole 22 is installed orthogonally on the rotation axis of the measurement arm 14. Wires 24, 24 are stretched between the upper surfaces of both ends of the measurement arm 14 and the upper end of the center pole 22, and the level of the measurement arm 14 is maintained by adjusting the length with the attached wire chain 24a. ing. Further, a counterweight 26 for improving the stability of the measuring arm 14 during work is provided on the upper surface of one end of the measuring arm 14 positioned.

  The lower swing 16 is attached to the tip of the measurement arm 14 located on the opposite side of the counterweight 26, and includes a piano wire 28 that is a thread-like lower yarn, and a weight 30 installed at one end of the piano wire 28. Composed. The weight 30 is immersed and installed in oil filled in an oil can 32 that is a swing preventing means. In addition, it is preferable to use the oil with which the oil can 32 is filled with comparatively viscosity.

  The rotation means 18 is provided on the lower surface of the support frame 33 and has a ring-shaped support frame 33 for connecting and fixing the measurement arm 14 on the upper surface, and is rotatably connected to the upper flange 12a of the rotation base 12. A pair of roller units 34, 34... The roller unit 34 includes a roller 36 that contacts the upper surface of the upper flange 12a, a roller 36 that contacts the side surface of the upper flange 12a, and a roller 36 that contacts the lower surface of the upper flange 12a. The roller guides 40 and 40 or a part of the roller unit 34 are rotatably attached. The roller guide 40 of the roller 36 that contacts the lower surface of the upper flange 12a is connected to the roller unit 34 via a jack bolt 42 whose length can be adjusted in the vertical direction. As a result, the rotation means 18 causes the centering device 10 to include a rotation mechanism that can stably rotate the measurement arm 14 along the three surfaces of the upper flange 12a with the center of the rotation base 12 as the rotation axis. Can do.

  Next, the operation of the centering apparatus 10 according to the embodiment of the present invention configured as described above will be described.

  FIG. 3 is a side view showing a state in which the centering device 10 according to the embodiment of the present invention is used in the assembly process of the generator 50.

  In order to efficiently rotate the rotating body, the centering work at the time of installing or forming the rotating body is regarded as important. In particular, in the generator 50, since the rotor 54 installed in the stator 52 is rotated by the rotational force from a turbine (not shown), the generator 54 is installed in a state where the rotor 54, which is a rotating body, is eccentric. If this occurs, not only efficient power generation cannot be performed, but also a failure factor during operation. Moreover, although the generator 50 requires periodic disassembly and inspection, it is necessary to install the rotor 54 without causing eccentricity when the generator 50 is reassembled after the inspection. Therefore, in the installation and maintenance of the generator 50, the centering of the rotor 54 is one of the important adjustment items in the work of assembling and installing the rotor 54.

  However, in the conventional centering operation, in the case of the generator 50 that is enlarged, not only the time and labor required for the centering operation of the rotor 54 is increased, but also the eccentricity cannot be measured with high accuracy. There was a problem.

  Therefore, the above-described problem can be solved by performing the centering operation on the rotor 54 using the centering device 10 of the present invention. That is, as shown in FIG. 3, in the assembly process of the generator 50, when assembling the rotor 54 stably placed by the pedestal 56 inside the stator 52 that forms the outer wall of the generator 50, the rotor 54 is assembled. When centering the outer periphery of the rotor 54, the centering device 10 is installed so that the center of the rotation base 12 is aligned with the center of the upper surface of the rotor 54, and the rotor 54 and the rotation base 12 are bolted. At this time, the measurement arm 14 is stably held in a horizontal state on the rotation base 12, and a downward swing 16 is suspended from the tip of the measurement arm 14. The measurement arm 14 is rotatably installed on the rotation base 12 by a rotation means 18.

  Therefore, the measurement arm 14 is rotated so that the position of the downward swing 16 is positioned at a plurality of locations measured by the rotor 54, and the distance from the downward swing 16 to the rotor 54 at each measurement location is measured. Then, the degree of eccentricity of the rotor 54 may be converted from the measured values measured at each measurement location, and the rotor 54 may be adjusted based on the converted values. As described above, the centering device 10 of the present invention does not include a particularly complicated device, member, or structure, and can perform accurate measurement only by rotating the measurement arm 14 near the upper surface and the outer periphery of the rotor 54. Therefore, the time, cost, and space required for the centering operation can be greatly reduced.

  Further, the rotating means 18 includes rollers 36, 36... Provided in the respective roller units 34, 34... Sandwiching the upper surface, side surfaces, and lower surface of the upper flange 12 a provided on the rotation base 12, and the upper flange 12 a. Since the measurement arm 14 can be stably maintained in a horizontal state because it travels along the three surfaces, the measurement arm 14 can be rotated around the rotation axis of the rotor 54. The degree can be measured accurately.

  Further, the weight 30 of the downward swing 16 is immersed in oil having viscosity inside the oil can 32. Due to the viscosity of the oil, the swing of the downward swing 16 caused by the movement of the measuring arm 14 can be buffered, so that the centering of the rotor 54 can be measured with high accuracy.

  In the centering device 10 described above, the number, shape, and size of each device and member used are not limited.

  In the centering device 10 of FIG. 3, the case where centering with respect to the outer diameter of the rotor 54 is taken as an example, but it is not particularly limited. The present invention can also be suitably used when forming the stator 52 of the generator 50. That is, if the centering device 10 of the present invention is installed at the center of the bottom of the stator 52, the centering of the stator 52 on the inner diameter side can be accurately performed.

  In the centering device 10, the measurement arm 14 has been described as having a fixed length, but is not particularly limited. If the measuring arm 14 has a telescopic structure and the weight of the counter 26 can be adjusted, centering corresponding to various diameters can be performed.

  Further, the rotating means 18 has a structure in which the rollers 36, 36... Provided in the plurality of roller units 34, 34... Are rotatably contacted with the three surfaces of the upper flange 12 a in the rotation base 12. There is no particular limitation. A ball bearing may be used as the rotation means 18 as long as the measurement arm 14 is connected to the rotation base 12 so that it can rotate stably in a horizontal state.

The disassembly perspective view which showed the structure of the centering apparatus of the rotary body which is embodiment of this invention Side surface sectional drawing which expanded a part of centering apparatus of the rotary body which is embodiment of this invention The side view which showed a mode that the centering apparatus of the rotary body which is embodiment of this invention was used for the assembly of a generator

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Rotating body centering device, 12 ... Rotation base, 12a ... Upper flange, 12b ... Lower flange, 14 ... Measuring arm, 16 ... Down swing, 18 ... Rotating means, 20 ... Fixing member, 20a ... Bolt hole , 22 ... center pole, 24 ... wire, 24a ... wire chain, 26 ... counterweight, 28 ... piano wire, 30 ... weight, 32 ... oil can, 33 ... support frame, 34 ... roller unit, 36 ... roller, 38 ... Rotating shaft, 40 ... Roller guide, 42 ... Jack bolt, 50 ... Generator, 52 ... Stator, 54 ... Rotor, 56 ... Pedestal

Claims (5)

In the centering method of the rotating body for centering the rotating body having a columnar or cylindrical shape,
A measurement arm provided with a downward swing at the tip of the arm disposed in the horizontal direction is rotated on the same axis as the rotational center of the rotating body around the upper center of the rotating body as a rotation center, and the above-mentioned A centering method for a rotating body, wherein the centering of the rotating body is performed by measuring a distance to each portion of the rotating body.   2. The method of centering a rotating body according to claim 1, wherein the distance is measured in a state where a weight attached to the tip of the downward swing is immersed in oil. In a rotating body centering device for centering a rotating body having a cylindrical or cylindrical shape,
A pedestal for rotation attached to the upper center of the rotating body;
A measuring arm having a swinging swing at the tip of the arm arranged in the horizontal direction;
A rotating mechanism that rotates the measuring arm on the rotating base so that the measuring arm rotates coaxially with the rotation center of the rotating body;
A rotating body centering device comprising: The rotation mechanism is
A disc-shaped flange provided on the rotation base and having a center coaxial with the rotation center of the rotating body;
Rotating means that is provided below the measuring arm, and includes a roller unit having three rollers that contact the upper surface, the lower surface, and the side surface of the flange, and is arranged at at least three locations around the flange.
A rotating body centering device comprising: 5. The rotating body centering device according to claim 3, further comprising swing preventing means for preventing the swing of the downward swing when the measuring arm moves.

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