JP2016023996A - Vibration measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that since a vibration meter base is directly bolt-fixed to the frame of a rotary machine, confirmation of the stop surface and angle adjustment have to be done in the stopped state of the rotary machine and require large-scale work.SOLUTION: A vibration measuring apparatus is equipped with: a shaft 31, which is shiftable relative to a fixing part 2 disposed in a position overlooking a rotation axle 1 in a rotary machine, one end part of the shaft being in contact with the circumferential face of the rotation axle; a vibration meter base 32 having a shaft holding part that holds the other end side of the shaft to be shiftable in the axial direction and a flange-shaped fitting part 32b provided integrally with the shaft holding part; a vibration sensor 33 installed on the vibration meter base to measure the vibration of the rotation axle via the shaft; and an angle adjusting member 35 intervening between the fixing part and the fitting part to be able to adjust the angle of the shaft relative to the rotation axle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration measuring device that detects vibration by directly contacting a rotating shaft of a rotating machine such as a turbine or a generator.

  In conventional contact-type vibration measuring devices, the vibration sensor is directly fixed with a bolt or the like to the frame of the rotating machine, and there is no prior art document that adjusts the mounting angle of the vibration sensor during operation of the rotating machine. It was. On the other hand, what uses an angle adjustment bolt for the attachment angle adjustment of a member is proposed (for example, refer to patent documents 1).

Japanese Patent Laying-Open No. 2004-19333 (page 4, FIG. 2)

  Since the vibration sensor is directly fixed to the base of a conventional rotating machine with a bolt, it does not have an angle adjustment mechanism.Therefore, when self-excited vibration occurs at the natural frequency of the vibration sensor, the rotation shaft and detector contact each other. In order to check and adjust the surface, it is necessary to stop the rotating machine, disassemble it, remove it from the base, and operate the rotating machine to check the results after adjusting the angle. Therefore, there is a problem that it takes time to confirm and adjust once. There is also a problem that it is difficult to confirm the mounting angle of the vibration sensor. Moreover, in the invention of Patent Document 1, although an effect that the vertical degree of the steel pipe column can be easily adjusted by the angle adjusting bolt is obtained, there is a problem that specialized work such as welding is required.

  The present invention has been made to solve the above-described problems, and angle adjustment is possible even during operation without stopping and disassembling a rotating machine such as a turbine or a generator that is an object of vibration detection. An object of the present invention is to obtain a vibration measuring apparatus that can be adjusted easily. It is another object of the present invention to provide a vibration measuring device that allows easy confirmation of the mounting angle of the vibration sensor.

The vibration measuring apparatus according to claim 1 of the present invention is provided so as to be movable in the direction of the rotating shaft with respect to a fixed portion provided at a desired position of the rotating shaft in the rotating machine, and one end portion of the rotating measuring device is a circumferential surface of the rotating shaft. A shaft that is in contact with the shaft, a shaft holding portion that holds the other end of the shaft movably in the axial direction, and a vibrometer base that has a flange-like mounting portion that is provided integrally with the shaft holding portion; A vibration sensor installed on the vibration meter base for measuring the vibration of the rotating shaft through the shaft, and an angle of the shaft relative to the rotating shaft interposed between the fixed portion and the mounting portion. An angle adjusting member.
A vibration measuring apparatus according to claim 6 of the present invention is provided so as to be movable in the direction of the rotating shaft with respect to a fixed portion provided at a position where the rotating shaft is desired in a rotary machine, and one end of the rotating shaft is located on the rotating shaft. A vibration meter having a shaft abutted on the peripheral surface, a shaft holding portion that holds the other end portion of the shaft so as to be movable in the axial direction, and a flange-like mounting portion provided integrally with the shaft holding portion. A base and a vibration sensor installed on the vibration meter base for measuring vibration of the rotating shaft through the shaft, and irradiating the rotating shaft with a laser beam from a laser pointer on the mounting portion; A window hole for confirming the perpendicularity to the rotation axis is provided.
The vibration measuring apparatus according to claim 7 of the present invention is provided so as to be movable in the direction of the rotating shaft with respect to a fixed portion provided at a desired position of the rotating shaft in the rotary machine, and one end portion of the rotating shaft is provided on the rotating shaft. A vibration meter having a shaft abutted on the peripheral surface, a shaft holding portion that holds the other end portion of the shaft so as to be movable in the axial direction, and a flange-like mounting portion provided integrally with the shaft holding portion. A base and a vibration sensor installed on the vibrometer base for measuring the vibration of the rotating shaft through the shaft, and for checking the state of the contact surface between the shaft and the rotating shaft on the mounting portion Fiberscope insertion holes are provided.

In the invention according to claim 1 of the present invention, an angle adjusting member is interposed between the fixed portion and the mounting portion so that the angle of the shaft with respect to the rotating shaft can be adjusted. Therefore, it is possible to obtain a vibration measuring device that can adjust the angle even during operation and can be easily adjusted.
In the invention according to claim 6 of the present invention, the mounting portion is provided with a window hole for irradiating the rotating shaft with the laser beam from the laser pointer and confirming the perpendicularity to the rotating shaft of the shaft. A vibration measuring device can be obtained in which the sensor mounting angle can be easily confirmed.
In the invention according to claim 7 of the present invention, since the fiberscope insertion hole for confirming the state of the contact surface between the shaft and the rotating shaft is provided in the mounting portion, the shaft and the rotating shaft of the vibration sensor are provided. A vibration measuring device that can easily confirm the state of the contact surface is obtained.

The block diagram which shows typically the principal part of the vibration measuring apparatus which concerns on Embodiment 1 of this invention. The block diagram which shows typically the principal part of the vibration measuring apparatus which concerns on Embodiment 2 of this invention. The block diagram which shows typically the principal part of the vibration measuring apparatus which concerns on Embodiment 3 of this invention. The block diagram which shows typically the principal part of the vibration measuring apparatus which concerns on Embodiment 4 of this invention. The block diagram which shows typically the principal part of the vibration measuring device which concerns on Embodiment 5 of this invention. The block diagram which shows typically the principal part of the vibration measuring device which concerns on Embodiment 6 of this invention. The block diagram which shows typically the principal part of the vibration measuring device which concerns on Embodiment 7 of this invention.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram schematically showing a main part of a vibration measuring apparatus according to Embodiment 1 of the present invention. In the figure, the vibration measuring apparatus according to the first embodiment appropriately includes, for example, a casing or a housing formed around a rotary shaft 1 such as a turbine rotor that is a measurement target in a rotary machine such as a gas turbine or a generator, or a bracket. In this case, here, the rotating shaft 1 is installed in a fixed portion 2 composed of a gantry provided in an upper portion in the figure. The vibration measuring device 3 includes a shaft 31 whose one end is in contact with the circumferential surface of the rotating shaft 1 and is movably disposed in the direction of the rotating shaft with respect to the fixed portion 2, and a shaft having a cylindrical inner circumferential surface. A vibration meter base 32 having a shaft holding portion 32a for holding 31 movably in the vertical direction of the figure and a flange-like mounting portion 32b integrally provided on the other end side of the shaft holding portion 32a, and this vibration A vibration sensor 33 that is installed on the meter base 32 and measures the vibration of the rotary shaft 1 through the shaft 31; a base attachment member 34 for attaching the vibration meter base 32 to the fixed portion 2; a base attachment member 34 and a vibration meter base And an angle adjusting bolt 35 for adjusting the angle of the shaft 31 with respect to the rotary shaft 1.

  The base attachment member 34 has a plate shape in which a hole 34 a through which the shaft holding portion 31 is inserted is provided at the center, and is attached to the fixing portion 2 by a plurality of bolts 341. The fixing portion 2 is provided with an insertion hole 2 a so as to be coaxial with the hole 34 a of the base mounting member 34. The angle adjustment bolt 35 is screwed into a screw hole 32 c provided in the attachment portion 32 b of the vibrometer base 32, and the tip portion thereof is provided so as to always contact the upper surface of the base attachment member 34. The vibrometer base 32 is fixed to the base mounting member 34 in a state where the angle adjustment by the angle adjustment bolt 35 is completed by a fixing screw (not shown) provided at a position different from the angle adjustment bolt 35. In that case, when angle adjustment is required during operation of the rotating machine, the angle is adjusted by the angle adjustment bolt 35 after loosening the fixing screw.

  The method for fixing the vibrometer base 32 is not particularly limited. For example, the vibration meter base 32 is fixed to the base mounting member 34 by an elastic member such as a spring, or is held by the base mounting member 34 with its own weight including the angle adjustment bolt 35 and the like. You may do it. For example, when the angle adjustment bolt 35 on the left side of the figure is turned in the loosening direction (counterclockwise), the tip of the shaft 31 tilts in the direction of arrow A, and conversely, when turned in the closing direction, the tip of the shaft 31 turns. Tilt in the direction of arrow B. In addition, the adjustment direction of the angle of the shaft 31 with respect to the rotating shaft 1 is the left-right direction of the figure which is in a plane orthogonal to the extending direction of the axis of the rotating shaft (the front-back direction of the drawing in the drawing) as shown in the figure. Therefore, it is desirable to install the angle adjusting bolt 35 in the direction of the surface orthogonal to the axial direction of the rotating shaft 1 around the central axis of the shaft 31. The number of angle adjusting bolts 35 may be one, or two at a symmetrical position as shown in FIG. 1, and three or more at a symmetrical position, and in the extending direction of the axis of the rotary shaft 1. You may enable it to adjust an angle.

  The screw hole 32c of the mounting portion 32b is changed to a thread-free insertion hole through which the angle adjusting bolt 35 is inserted in a loose fit, and the angle adjusting bolt 35 is freely rotatable in the insertion hole and moved in the vertical direction. The base mounting member 34 is provided with a screw hole (not shown) that is screwed into the tip of the angle adjustment bolt 35, and the tip of the angle adjustment bolt 35 is screwed into the screw hole. Alternatively, the angle of the shaft 31 may be adjusted by loosening, and at the same time, the vibration meter base 32 may be fixed to the base mounting member 34 by the angle adjusting bolt 35. In that case, the vibration meter base 32 can be securely fixed to the base mounting member 34 by screwing a loosening prevention nut (not shown) into the inner side of the tip of the angle adjusting bolt 35 in advance. The shaft 31 can be the same as the conventional one without any particular limitation, and is made of, for example, a hollow or solid lightweight metal having a circular cross section, and is brought into contact with the outer peripheral surface of the rotating shaft by gravity. In addition, the vibration sensor 33 and a circuit (not shown) for monitoring vibration using a detection signal from the vibration sensor 33 may be appropriately selected from the same ones as in the past. In the first embodiment, the vibration sensor 33 is a contact type vibration sensor.

  In the [0012] aspect of the first embodiment configured as described above, the base mounting member 34 is fixed to the fixing portion 2 such as a gantry by the bolt 341. Then, the vibrometer base 32 is fixed to the base mounting member 34 with the angle adjusting bolt 35. By adjusting one side of the angle adjustment bolt 35 in a loosening direction or a tightening direction, the tip portion of the shaft 31 moves in the direction of arrow A or arrow B in the figure, and the angle of the shaft 31 with respect to the rotating shaft 1 (the angle of the contact surface) To change. As a result, the tip end portion of the shaft 31 of the vibrometer moves while the angle adjustment bolt 35 is tightened, so that the angle of the shaft 31 can be adjusted even during operation of the rotary machine.

  As described above, according to the first embodiment, the fixing bolt 341 is separated between the fixing portion 2 and the mounting portion 32b of the vibrometer base 32, and the angle adjusting bolt 35 as an angle adjusting member is interposed. Since the angle of the shaft 31 with respect to the rotating shaft 1 can be adjusted, the tip portion of the shaft 31 of the vibrometer moves while the angle adjusting bolt 35 is tightened, which involves stopping or disassembling the rotating machine. In addition, it is possible to obtain a vibration measuring device that can adjust the angle even during operation and can be easily adjusted.

Embodiment 2. FIG.
FIG. 2 is a configuration diagram schematically showing a main part of a vibration measuring apparatus according to Embodiment 2 of the present invention. In the figure, the flange-shaped attachment portion 32b of the vibrometer base 32A is formed in a tapered shape whose thickness decreases from the center side toward the outer peripheral side. A plurality of wedge-shaped angle adjusting pieces 36 are inserted between the tapered surface 32 d and the upper surface of the fixed portion 2. A plurality of angle adjusting pieces 36 having different angles are prepared in advance, appropriately selected according to the required amount of adjustment of the angle of the shaft 31 (not shown) with respect to the rotating shaft 1, and inserted into the right side or the left side of the figure to obtain the angle. It fixes to the fixing | fixed part 2 with the adjustment volt | bolt 35. FIG. In addition, the angle adjustment member which can adjust the angle of the shaft 31 with respect to the rotating shaft which is abbreviate | omitting illustration by the some angle adjustment piece 36 and the angle adjustment bolt 35 is comprised here. Although the base attachment member 34 is omitted and unnecessary, the base attachment member 34 may be used. In addition to the shaft 31, some illustrations such as the shaft holding portion 32 a, the vibration sensor 33, the insertion hole 2 a, and the hole 34 a are simplified or omitted, but other configurations are the same as in the first embodiment. It is.

  As described above, the second embodiment has a tapered surface 32d having an inclined rear surface of the flange-shaped attachment portion 32b, and a plurality of wedge-shaped angle adjusting pieces inserted between the tapered surface 32d and the fixing portion 2. By appropriately adjusting 36 and fixing it with the angle adjusting bolt 35, the angle of the shaft 31 can be adjusted without removing the vibration measuring device from the rotating machine. Since the angle can be adjusted without removing the vibration meter base 32A and the like, the angle can be adjusted without stopping or disassembling the rotating machine even during operation of the rotating machine. In addition, when the wedge-shaped angle adjustment piece 36 is inserted into the tapered surface 32d of the mounting portion 32b and fixed with the angle adjustment bolt 35, a component force that moves the angle adjustment piece 36 in the radially outward direction acts. This can be prevented by an appropriate method such as installing a ring-shaped restraining member (not shown) on the outer periphery.

Embodiment 3 FIG.
FIG. 3 is a configuration diagram schematically showing a main part of a vibration measuring apparatus according to Embodiment 3 of the present invention. In the figure, a laser beam 37L made of visible light emitted from a laser pointer 37 is passed through the mounting portion 32b of the vibrometer base 32 in the direction of the rotary shaft 1 (not shown), and the rotary shaft 1 and the shaft 31 (shown). A common window hole H1 for visually confirming the contact position (omitted) is provided. The number of window holes H1 may be one as shown in the figure, or the window hole for irradiation with the laser beam 37L and the window hole for visual observation may be separated and installed individually. In any case, it is necessary to form a hole having a sufficient size necessary for the passage of the laser beam 37L and visual confirmation, and a position corresponding to the window hole H1 in the fixing portion 2 is, for example, an independent hole or notch. Needless to say, it is necessary to secure a light path by providing a large insertion hole 2a (shown in FIG. 1) of the shaft holding portion 32a. The laser pointer 37 is installed so that the laser beam 37L is parallel to the central axis of the shaft 31 or the shaft holding portion 32a. In this example, the vibrometer base 32 is directly fixed to the fixing portion 2 by bolts 341, and the base mounting member 34 is omitted. Other configurations are the same as those of the first embodiment, including a portion not shown.

In the third embodiment configured as described above, when it is necessary to check the perpendicularity of the shaft 31 that is in contact with the rotating shaft 1, a laser pointer 37 is prepared to attach the vibration meter base 32. The perpendicularity is detected by irradiating the outer peripheral surface of the rotating shaft 1 with a laser beam 37L from the window hole H1 provided in 32b and visually checking the angle of the shaft 31 with respect to the rotating shaft 1 from the common window hole H1. The
According to the third embodiment, the mounting portion 32b of the vibrometer base 32 is irradiated with the laser beam L1 from the laser pointer 37 on the rotating shaft 1, and the window hole H1 for confirming the perpendicularity of the shaft 31 with respect to the rotating shaft 1. By providing the above, it is possible to easily confirm the perpendicularity of the shaft 31 with respect to the rotating shaft 1 visually from the window hole H1 without stopping the rotating machine regardless of whether the rotating machine is operating or stopped. it can. Since the window hole H1 is provided in the attachment portion 32b of the vibration meter base 32, after the vibration meter base 32 is attached to the fixing portion 2, the degree of perpendicularity of the shaft 31 with respect to the rotary shaft 1 is always required when necessary. Can be observed.

Embodiment 4 FIG.
FIG. 4 is a configuration diagram schematically showing a main part of a vibration measuring apparatus according to Embodiment 4 of the present invention. In the figure, the vibrometer base 32 is provided with a fiberscope insertion hole H2 for inserting a fiberscope 38 for checking the contact state between the rotary shaft 1 and the shaft 31 (not shown). The fiberscope 38 is preferably one in which the distal end portion on the objective side is bent in a desired direction and incorporates an illuminating device that illuminates the target portion, but is not particularly limited thereto. The vibrometer base 32 is directly fixed to the fixing portion 2 by bolts 341, and the base mounting member 34 is omitted. Other configurations are the same as those of the first embodiment, including a portion not shown.

  In the fourth embodiment configured as described above, the state of the contact surface of the shaft 31 that is in contact with the rotating shaft 1 regardless of whether the rotating machine is operating or stopped is inserted into the fiberscope as needed. It can be easily confirmed by the fiberscope 38 inserted through the hole H2.

Embodiment 5 FIG.
FIG. 5 is a configuration diagram schematically showing a main part of a vibration measuring apparatus according to Embodiment 5 of the present invention. In the figure, a laser beam 37L made of visible light from a laser pointer 37 is passed through the vibrometer base 32 and the base mounting member 34 in order to confirm the contact position between the rotary shaft 1 and the tip portion (not shown) of the shaft 31. In addition, a window hole H1 as a confirmation window for visually confirming the contact position is provided coaxially. The number of the window holes H1 may be one as viewed from above in the drawing, or the window holes for irradiating the laser beam 37L and the window holes for visual observation may be separated and installed individually. Needless to say, in any case, it is necessary to form a hole having a sufficient size necessary for irradiation and visual confirmation. The laser pointer 37 is installed so that the laser beam 37L is parallel to the central axis of the shaft 31 or the shaft holding portion 32a. Other configurations are the same as those of the first embodiment, including a portion not shown.

In the fifth embodiment configured as described above, the outer peripheral surface of the rotary shaft 1 is irradiated with the laser beam 37L by the laser pointer 37 from the window hole H1 provided in the mounting portion 32b, and is brought into contact with the rotary shaft 1. The perpendicularity of the shaft 31 with respect to the rotation axis 1 is visually confirmed from the window hole H1. And when the said perpendicularity has shifted | deviated to the A direction or B direction of FIG. 1, the angle of the shaft 31 is adjusted with the same procedure as Embodiment 1 shown in FIG.
According to the fifth embodiment, the laser pointer 37 for irradiating the laser beam for confirming the perpendicularity of the shaft 31 to the rotation axis 1 and the confirmation position for confirming the irradiation position of the laser beam 37L by the laser pointer 37. By providing the window hole H1, it is possible to adjust the angle of the shaft 31 even during operation without stopping the rotating machine, and to obtain a vibration measuring device that can be easily adjusted. By combining the contact position confirmation, it is possible to efficiently perform the angle adjustment while confirming the contact position, and there is an effect that the adjustment work can be further facilitated.

Embodiment 6 FIG.
FIG. 6 is a configuration diagram schematically showing a main part of a vibration measuring apparatus according to Embodiment 6 of the present invention. In the figure, the vibrometer base 32 and the base mounting member 34 are coaxially provided with a fiberscope insertion hole H2 for inserting a fiberscope 38 for checking a contact state between the rotary shaft 1 and the shaft 31 (not shown). ing. The fiberscope 38 is preferably one in which the distal end portion on the objective side is bent in a desired direction, and is preferably incorporated with an illuminating device, but is not particularly limited thereto. Other configurations are the same as those of the first embodiment, including a portion not shown.

  In the sixth embodiment configured as described above, as in the first embodiment, a vibration measuring device that can adjust the angle even during operation without stopping or disassembling the rotating machine and is easy to adjust. In addition, the contact state between the rotary shaft 1 and the shaft 31 (not shown) can be confirmed by the fiberscope 38 inserted through the fiberscope insertion hole H2, so that the angle adjustment is necessary when the angle adjustment is necessary. However, when the contact surface needs to be confirmed, the contact surface can be confirmed, and when the angle adjustment by the angle adjustment bolt 35 is performed, the contact state between the rotating shaft 1 and the shaft 31 (not shown) is confirmed by the fiber scope 38. Since it can work, the further effect that angle adjustment work can be performed still more easily is acquired.

Embodiment 7 FIG.
FIG. 7 is a configuration diagram schematically showing a main part of a vibration measuring apparatus according to Embodiment 7 of the present invention. In the figure, a laser beam 37L made of visible light from a laser pointer 37 is passed through the vibration meter base 32 and the base mounting member 34 in order to confirm the contact position between the rotary shaft 1 and the shaft 31 (not shown). A coaxial fiberscope insertion hole through which the fiberscope 38 is inserted in order to confirm the contact state between the rotation hole 1 and the shaft 31 (not shown) as a confirmation window for confirming the position visually. H2 is provided. Other configurations are the same as those of the first embodiment, including a portion not shown.

  In the seventh embodiment configured as described above, as in the first embodiment, a vibration measuring device that can adjust the angle during operation without stopping or disassembling the rotating machine and can be easily adjusted is provided. In addition to the angle adjustment function, the position confirmation window hole H1 and the fiberscope insertion hole H2 for contact surface confirmation are combined to check the contact position when angle adjustment is required. However, the angle can be adjusted, and if the contact surface needs to be confirmed, the installation surface can be confirmed, and the effect of making the angle adjustment work even easier can be obtained.

  It should be noted that within the scope of the present invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 1 Rotating shaft, 2 Fixed part, 2a Insertion hole, 3 Vibration measuring device, 31 Shaft, 32 Vibrometer base, 32A Vibrometer base, 32a Shaft holding part, 32b Mounting part, 32c Screw hole, 32d Tapered surface, 33 Vibration sensor , 34 Base mounting member, 34a hole, 341 bolt, 35 angle adjustment bolt, 36 angle adjustment piece, 37 laser pointer, 37L laser beam, 38 fiberscope, H1 window hole, H2 fiberscope insertion hole.

Claims (7)

  A shaft that is provided so as to be movable in the direction of the rotating shaft with respect to a fixed portion that is provided at a desired position of the rotating shaft in the rotating machine, and a shaft whose one end is in contact with the circumferential surface of the rotating shaft, and the other end of the shaft A shaft holding part for holding the part side movably in the axial direction, and a vibrometer base having a flange-like mounting part provided integrally with the shaft holding part, and installed on the vibrometer base via the shaft A vibration measuring apparatus comprising: a vibration sensor that measures vibration of the rotating shaft; and an angle adjusting member that is interposed between the fixed portion and the mounting portion and can adjust an angle of the shaft with respect to the rotating shaft.   The angle adjustment member includes an angle adjustment bolt that is screwed into the flange-shaped attachment portion and is provided so that the angle of the shaft holding portion with respect to the fixing portion is changed by adjusting the screwing amount. The vibration measuring apparatus according to claim 1.   The vibration measuring apparatus according to claim 1, wherein the angle adjusting member includes at least one wedge-shaped angle adjusting piece interposed between the flange-shaped attachment portion and the fixing portion.   4. The window according to any one of claims 1 to 3, wherein a window hole for irradiating the rotating shaft with a laser beam from a laser pointer and confirming the perpendicularity of the shaft to the rotating shaft is provided in the mounting portion. The vibration measuring device according to claim 1.   5. The vibration measuring device according to claim 1, wherein a fiberscope insertion hole for confirming a state of a contact surface between the shaft and the rotating shaft is provided in the attachment portion. .   A shaft that is provided so as to be movable in the direction of the rotating shaft with respect to a fixed portion that is provided at a desired position of the rotating shaft in the rotating machine, and a shaft whose one end is in contact with the circumferential surface of the rotating shaft, and the other end of the shaft A shaft holding part for holding the part side movably in the axial direction, and a vibrometer base having a flange-like mounting part provided integrally with the shaft holding part, and installed on the vibrometer base via the shaft A vibration sensor for measuring vibration of the rotating shaft, and a window hole for irradiating the rotating shaft with a laser beam from a laser pointer on the mounting portion and confirming the perpendicularity of the shaft to the rotating shaft. A vibration measuring apparatus characterized by that.   A shaft that is provided so as to be movable in the direction of the rotating shaft with respect to a fixed portion that is provided at a desired position of the rotating shaft in the rotating machine, and a shaft whose one end is in contact with the circumferential surface of the rotating shaft, and the other end of the shaft A shaft holding part for holding the part side movably in the axial direction, and a vibrometer base having a flange-like mounting part provided integrally with the shaft holding part, and installed on the vibrometer base via the shaft A vibration sensor for measuring vibration of the rotating shaft, and a vibration measuring device comprising a fiberscope insertion hole for confirming a state of a contact surface between the shaft and the rotating shaft in the mounting portion apparatus.

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