JP2004257889A - Measurement gauge for optical instrumentations and its mounting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measurement gauge capable of sticking a reflector of the measurement gauge on a rotational shaft as an object to be measured easily and precisely, and to provide a method of mounting it. <P>SOLUTION: The measurement gauge 50 is stuck on the outer periphery of the turbine rotor 4 provided with a reflector P having a bar code area while reflecting light rays irradiating a turbine rotor 4 to light receiving part of the optical instrument. The measurement gauge 50 is provided with a long strip-shaped member 51 having a straight edge 51a extending toward longitudinal direction, and the reflector P wherein a bar code area is provided. Each bar code in the bar code area is provided perpendicular to and referring to the edge 51a of the strip-shaped member 51. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a measuring gauge for an optical measuring instrument, and more particularly, to a measuring gauge for an optical measuring instrument that non-contactly and optically measures a torque and a rotating speed of a rotating shaft to be measured, and a method of attaching the measuring gauge.
[0002]
[Prior art]
As this type of optical measuring device, a torque measuring device including a measuring device main body and a measuring gauge attached to a rotating shaft to be measured is known (Patent Document 1).
[0003]
More specifically, first, a plurality of measurement gauges each having a reflection portion provided with a barcode region by etching are attached at predetermined intervals in the axial direction of the rotation axis to be measured. Subsequently, the rotating shaft is rotated, and a laser beam is applied to each measuring unit (reflecting unit) using the portion where the measuring gauge is attached as a measuring unit. In addition, the reflected light of each measuring unit is received by the light receiving unit, and the rotation cycle and the rotating speed of each measuring unit are obtained based on the pulse signal obtained from the reflected light. In addition, the phase difference between the pulse signals between the measurement units is determined, and the torque of the rotating shaft is calculated from the rotation speed and the phase difference.
[0004]
[Patent Document 1] JP-A-2000-205977
[0005]
In this type of optical measuring instrument, how to accurately attach the measuring gauge to the object to be measured is an important point in improving the measuring accuracy, in addition to the performance of the measuring instrument body.
[0006]
Conventionally, glue is applied to the back surface of a measuring gauge consisting of a small piece of about 2 cm square, and in this state, the measuring gauge is temporarily attached to the surface of the rotating shaft to be measured, and then the position and angle of the measuring gauge are finely adjusted. After the adjustment, the measuring gauge is permanently attached to the rotating shaft. Adjustment of the position of the measurement gauge is left to the intuition and experience of the operator, and the operator should keep the center line of the rotation axis as a guide and keep each code in the barcode area parallel to this center line. The position and angle of the measuring gauge were adjusted so that it could fall.
[0007]
[Problems to be solved by the invention]
However, in the related art, the measurement gauge is stuck depending on the intuition and experience of the operator, so that the measurement gauge may be sometimes stuck in a bent state with respect to the center line of the rotating shaft. For this reason, as shown in FIG. 5, the position of each cord is relatively shifted in the circumferential direction of the rotating shaft due to the occurrence of vibration or thermal expansion acting in the axial direction of the rotating shaft, resulting in a reflection state that should be obtained. The laser light is input to the measuring instrument main body in a different reflection state. In other words, when the measurement gauge is attached depending on the intuition or experience of the worker, an error may sometimes occur in the measured value.
[0008]
In particular, in the case of a large-diameter rotor shaft (turbine rotor) that is much larger than 70 cm in diameter incorporated in a power plant or the like, the measurement gauge is too small compared to the rotor shaft to be measured, and the exposed portion of the rotor shaft is small. For this reason, it is difficult to grasp the positional relationship between the two even with the use of skilled technology.Therefore, when attaching the measurement gauges, disassemble the power plant, remove the rotor shaft, and attach the measurement gauges in this state. I was
That is, in order to attach the measuring gauge to the large-diameter rotary shaft with high accuracy, much labor and skill were required.
[0009]
The present invention has been made in view of such a technical background, and an object of the present invention is to provide a technology that can easily and accurately attach a reflecting portion to a rotating shaft to be measured.
[0010]
[Means for Solving the Problems]
In order to solve the above technical problem, the present invention has the following configuration.
That is, the present invention
For optical measuring instruments having a barcode area that is attached to the outer peripheral surface of the rotating shaft to be measured and that has a barcode area that reflects the light beam applied to the rotating shaft and enters the light receiving section of the optical measuring instrument. Measurement gauge,
The measurement gauge includes a long band-shaped member having a linear edge extending in the longitudinal direction, and the reflection unit provided on the band-shaped member.
Each of the codes in the bar code area provided in the reflection section is provided at right angles to the edge of the strip-shaped member with reference to the edge.
[0011]
The measuring gauge of the present invention configured as described above includes a long band-shaped member having a linear edge extending in the longitudinal direction, and a reflecting portion provided on the band-shaped member. Further, each code in the bar code area provided in the reflection portion is provided at right angles to the edge of the band-shaped member with reference to the edge.
Note that the “long” is equivalent to a length that can be visually recognized to be sufficiently longer than the length of each code in the barcode area. The “barcode area” corresponds to an area having a function of changing the presence or absence of reflection and the intensity of reflected light.
[0012]
Therefore, by arranging the edge of the band-shaped member on the reference line extending in the circumferential direction of the rotation axis, a large number of reference points to be used as a guide for the sticking operation can be secured around the measurement gauge. As compared with the case where the measurement gauge is attached by relatively comparing the code area and the center line of the rotation axis, the attachment can be performed with higher accuracy.
Here, the “reference line extending in the circumferential direction of the rotation axis” corresponds to a line whose cross section passing through the line intersects at right angles to the center line of the rotation axis.
[0013]
Further, the band-shaped member may have a length equal to or longer than a circumferential length of the rotation shaft.
[0014]
In this configuration, since the entire length of the belt-shaped member is ensured to be equal to or greater than the circumferential length of the rotating shaft, it is possible to set a standard for the sticking operation around the entire circumference of the rotating shaft. Also, since the parallelism of the bar code area can be obtained by aligning the edges of the band-shaped member at one end and the other end on the same straight line, if a measurement gauge is adhered according to two different standards from these viewpoints, The measurement gauge can be attached with higher accuracy.
[0015]
Further, a plurality of the reflection portions may be provided at equal intervals in a longitudinal direction of the band-shaped member.
[0016]
In this configuration, a plurality of reflectors are provided at equal intervals in the longitudinal direction of the belt-shaped member. Therefore, when arranging a plurality of reflection portions at equal intervals in the circumferential direction of the rotation axis to be measured, the use of the present measurement gauge makes it possible to uniformly attach the reflection portions.
[0017]
Further, a configuration may be provided in which cutting portions for cutting the band-shaped member while leaving the reflecting portion are provided on both sides of the reflecting portion.
[0018]
In this configuration, cut portions are provided on both sides of the reflection portion. Therefore, after the measurement gauge is attached, the excess band-shaped member can be cut off at the cut portion.
Here, the "cutting portion" corresponds to a portion provided with a function for facilitating cutting.
[0019]
Further, the cutting portion is provided with a weak line extending from one edge to the other edge of the band-shaped member, and an opening having the weak line on the outer edge and facing the surface of the rotating shaft inside. May be formed.
[0020]
In this configuration, a weak line extending from one edge of the band-shaped member to the other edge is provided as the cut portion. The cutting portion has an opening having the line of weakness at the outer edge and facing the surface of the rotating shaft inside. Therefore, at the time of the cutting operation, the finger can be attached to the opening and the reflecting portion and the rotating shaft can be mutually pressed, so that the positional deviation of the reflecting portion due to the cutting operation can be suppressed. Further, since the opening is formed with the weak line at the outer edge, a part of the weak line is already cut, and in this regard, the cutting operation can be simplified.
[0021]
Further, a configuration may be adopted in which a connecting portion for connecting a jig for lifting the end portion is provided at an end portion of the band-shaped member.
[0022]
In this configuration, a connecting portion for connecting a jig (for example, a string and a wire) used in the work of winding the measurement gauge around the rotating shaft is provided at an end of the band-shaped member. Therefore, if one end of the measuring gauge is fixed to the rotating shaft, and the other end of the measuring gauge is lifted via a jig and the rotating shaft is rotated, the measuring gauge can be used even in a position where the operator cannot reach. Can be wound while contacting the rotating shaft.
[0023]
In addition, one end of the band-shaped member and the other end of the band-shaped member are engaged with each other in a state where they abut against each other, and that the edges near each end are aligned on the same straight line. It may be configured to have a shape.
[0024]
With this configuration, in setting the end shape of the band-shaped member, one end and the other end of the band-shaped member are abutted with each other, and the engagement is performed on condition that the edges near each end are aligned on the same straight line. The shape is adopted. In other words, if both ends of the belt-shaped member are in the engaged state, it can be said that the edges of the measurement gauge are aligned on the reference line extending in the circumferential direction of the rotation axis. In other words, the bar code area in the reflection section It can be said that the degree of parallelism has appeared.
[0025]
In addition, the present invention provides the following mounting method in order to solve the above-mentioned problems.
That is, a step of providing each code of the barcode region at a right angle with respect to the edge on a long strip-shaped member having an edge formed by a straight line,
A step of determining the sticking position of the reflector by aligning the linear edge with a reference line extending in the circumferential direction of the rotation axis,
And a method for mounting a measurement gauge.
[0026]
A step of connecting a jig for lifting the one end to one end of the band-shaped member;
Fixing the other end of the band-shaped member to the rotating shaft;
A step of rotating the rotating shaft while lifting one end of the band-shaped member through the jig,
May be further included.
[0027]
Further, a step of attaching the reflective portion to the rotating shaft,
Cutting the band-shaped member while leaving the reflection portion;
May be further included.
[0028]
According to these methods, a long strip-shaped member having an edge portion formed in a straight line is prepared, and each code in a barcode area is attached to the edge portion at right angles. Then, the edge of the band-shaped member is aligned with a reference line extending in the circumferential direction of the rotation axis to be measured and is attached. Therefore, as described above, each code in the barcode area is maintained parallel to the center line of the rotation axis.
[0029]
Also, in the work of winding the measuring gauge, one end of the measuring gauge is fixed to the rotating shaft, and the other end of the measuring gauge is lifted through a jig to rotate the rotating shaft. The winding operation can be performed while the belt-shaped member is in contact with the rotating shaft even at a position where the belt cannot reach. In addition, the surplus band-shaped member can be cut off while leaving the reflection portion.
[0030]
The various contents described above can be combined as much as possible without departing from the subject and the technical idea of the present invention. Similarly, the processing order of each of the above steps can be freely changed without departing from the problem and the technical idea of the present invention.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a preferred embodiment of a measurement gauge for an optical measuring instrument and a method of mounting the same according to the present invention will be described.
In the present embodiment, a torque measurement operation of a turbine rotor connected to a generator of a combined cycle power plant as a rotation axis to be measured will be described as an example. Note that, of course, the use of the measurement gauge according to the present invention is not limited to torque measurement of a turbine rotor, but can be applied to various uses.
[0032]
First, prior to the description of a measurement gauge according to the present invention, a schematic configuration of a combined cycle power plant and an optical measuring instrument used for measuring torque of a turbine rotor thereof will be described.
[0033]
As shown in FIG. 1, the combined cycle power plant 1 is a single-shaft power plant including a gas turbine G and a steam turbine T as one plant unit, and the turbine rotor 4 includes a gas turbine G and a steam turbine T. Are coaxially connected and incorporated in the plant as a power transmission shaft for transmitting power to the generator 5.
More specifically, the gas turbine body 2 and the compressor 3 are incorporated in the turbine rotor 4 as the gas turbine G, and the high-pressure steam turbine (HP turbine 6) and the medium-pressure steam turbine (IP) are used as the steam turbine T. A turbine 7) and a low-pressure steam turbine (LP turbine 8) are incorporated, and an end of the turbine rotor 4 is connected to a main shaft of a generator.
[0034]
In addition, in this type of power plant 1, in order to suppress a decrease in thermal efficiency due to aging, efficiency is periodically managed based on power plant measurement data called PID. In addition, the operation with high thermal efficiency is maintained by daily inspection work and maintenance based on the efficiency management.
[0035]
In recent years, an optical torque measuring device using laser light has been used for measuring a turbine output useful for efficiency management.
As shown in FIG. 2, this type of torque measuring device 10 divides a laser beam emitted from the laser beam irradiating device 11 into first and second light beams. And a beam adjusting device 12 that irradiates a total of two measuring units S (S1, S2) provided at a distance in the longitudinal direction of the turbine rotor 4, and receives reflected light from each of the measuring units S1, S2. A first light receiving unit 14 and a second light receiving unit 15 for performing photoelectric conversion and outputting an electric signal generated by the photoelectric conversion to an analyzing device 13 comprising a general-purpose computer.
[0036]
Further, a measurement gauge having a reflection portion P having a barcode area B attached to the surface thereof is attached to each of the measurement portions S1 and S2, and in this state, the turbine rotor 4 (hereinafter, also referred to as a rotation shaft). Is rotated, the light reflected by the reflecting portion P is incident on each of the light receiving portions 14 and 15. Therefore, a first pulse signal corresponding to the reflected light received by the first light receiving unit 14 and a second pulse signal corresponding to the reflected light received by the second light receiving unit 15 are input to the analyzer 13.
[0037]
Here, the reflecting section P will be described. In the present embodiment, a bar code area B for generating an M-sequence (Maximum-Length Linear Shift Register Sequence) signal is provided in the reflecting section P. More specifically, as shown in FIG. 3, a white portion B1 having a high laser light reflectance and a groove portion B2 having a low laser light reflectance are alternately arranged and formed on a reflecting portion P, and these white portions B1 and The bar code area B is constituted by a code including the groove B2.
[0038]
The “M-sequence signal” is a pseudo-random signal that is generated based on a rule artificially such that the autocorrelation function is close to a delta function and can be approximately regarded as white noise (white noise). (Pseudo-Random Signal), which has excellent characteristics such as high reproducibility of reflection of laser light and effective removal of noise (white noise) upon reflection. Of course, the form of the barcode area B to be applied to the reflection unit is not limited to the above-described M sequence, but can be applied to a quadratic residue sequence (L sequence), a biprime sequence, or the like.
[0039]
Further, in the present embodiment, when forming the M-series barcode region B, a groove having a depth of 0.05 mm is formed in a stainless material having a thickness of 0.1 mm by etching, so that the white portions B1 and B1 are formed. Both grooves B2 are obtained.
[0040]
Subsequently, the analysis device 13 individually analyzes the pulse signals of the light receiving units 14 and 15 and calculates the rotation period and the rotation speed for each measurement unit. Further, the phase difference between the pulse signals is obtained by comparing the first pulse signal and the second pulse signal, and the delay of the second pulse signal with respect to the first pulse signal is determined based on the phase difference, the rotation period, and the rotation speed. Find time (correlation). Then, for example, the shaft torque Ft, which is a measured value, is calculated by assigning each numerical value to the following expression and calculating.
(Equation 1)
Ft = 2πKx · τ / T
K: twist constant of the rotating shaft x: distance between the measuring parts S
τ: delay time T: pulse signal period
[0041]
By the way, in order to measure the shaft torque Ft with high accuracy, it is important to attach the measuring gauge to the rotating shaft 4 with high accuracy, in addition to the performance of the torque measuring device described above.
[0042]
Note that FIG. 4 shows a normal method of sticking. In this normal application method, the position of the reflection part P is adjusted so that each code in the barcode area B is parallel to the center line of the rotation axis 4 to be measured. On the other hand, in FIG. 5, each code in the barcode area B is pasted so as to bend with respect to the center line of the rotating shaft 4.
[0043]
Comparing the two, first, at the measurement point X in FIG. 4 and the measurement point Y in FIG. 5, both reflect the laser light at the second white portion B1 counted from the top.
On the other hand, vibration or thermal expansion occurs in the axial direction of the rotating shaft 4 (the direction of arrow K in FIGS. 4 and 5), and the bar code area B is relatively displaced from the original measurement points X and Y. In the normal case, the laser beam is reflected by the white portion B1 at the second stage from the top before and after the vibration occurs (measurement point X 'in FIG. 4). In the method of attaching 5, each cord is relatively displaced in the circumferential direction of the rotating shaft 4, so that the laser light is reflected at the first-stage white portion B1 counted from above (measurement point Y ′ in FIG. 5). ).
[0044]
In other words, in a state where the parallelism of each cord is not ensured with respect to the center line of the rotating shaft 4, that is, in a method of attaching with low accuracy, the reflection state of the laser light before and after the occurrence of vibration or thermal expansion is different, and the It will affect accuracy. For this reason, in the present embodiment, in attaching the reflecting portion P with high accuracy, the attaching operation is performed using the measuring gauge 50 described below.
[0045]
First, the outline of the measuring gauge 50 will be described with reference to FIG. 6. The measuring gauge 50 has a long band-shaped member 51 having a total length substantially equal to the circumference of the rotating shaft 4, and is provided on the surface of the band-shaped member 51. And a reflecting portion P provided.
When the reflecting portion P is arranged at an appropriate position on the rotating shaft 4, the edge 51 a extending in the longitudinal direction of the measurement gauge 50 is connected to a reference line extending in the circumferential direction of the rotating shaft 4 (for example, on the outer periphery of the turbine rotor 4). (The formed oil groove) to maintain the sticking accuracy of the measuring gauge 50.
[0046]
The belt-shaped member 51 is made of a stainless steel material having a thickness of 0.1 mm and a width of 20 mm, and an edge portion 51a extending in the longitudinal direction is straightened by precision processing. The material and dimensions of the belt-shaped member 51 can be variously changed according to various specifications. However, if the dimensions are set to the above-described dimensions, the measurement gauge 50 can have sufficient rigidity and flexibility (flexibility).
[0047]
The plurality of reflection portions P are provided at equal intervals in the longitudinal direction of the belt-shaped member 51.
In the present embodiment, a total of eight measuring parts S are provided at equal intervals around the rotating shaft 4 (waist circumference), and accordingly, the circumferential length of the rotating shaft 4 is divided into eight equally spaced intervals. Each reflection part P is provided on the measurement gauge 50.
[0048]
Further, in the reflecting portion P, the barcode area B capable of generating an M-sequence signal in the reflection of the laser light as described above is formed. Further, each code formed of the white portion B1 and the groove B2 formed in the barcode area B is provided at right angles to the edge 51a formed with a straight line as a reference.
[0049]
Further, on both sides of the reflecting portion P, cutting portions 53 for cutting the belt-shaped member 51 while leaving the reflecting portion P are provided. The cut portion 53 is formed at a weak line 53 a (perforated line) having perforations provided at intervals of 0.5 mm from one edge 51 a to the other edge 51 b of the belt-shaped member 51, and an end thereof. The cutout 53b has a triangular shape.
[0050]
Further, in the present embodiment, an opening 54 having the weak line 53a at the outer edge and facing the surface of the rotating shaft 4 therein is formed along the weak line 53a.
More specifically, as shown in FIG. 6, while maintaining a connected state near both ends of a weak line 53 a extending from one edge 51 a to the other edge 51 b of the band-shaped member 51, The opening 54 is formed such that the reflecting portion P and the opening 54 are adjacent to each other with the boundary 53a.
[0051]
Subsequently, the end shape of the band-shaped member 51 will be described.
As shown in FIG. 7, the ends of the band-shaped member 51 are engaged with each other in a state where they abut against each other and on the condition that the edges 51a near each end are aligned on the same straight line L. It has. In the example of FIG. 7, each end is cut so as to be perpendicular to an edge 51 a extending in the longitudinal direction of the belt-shaped member 51. When abutted, the entire ends are engaged and contacted by a line on the common contact line V.
[0052]
In addition, a jig (for example, a string) for suspending the end of the measurement gauge 50 (the end of the band-shaped member 51) to the worker side in the work of winding the measurement gauge 50 is connected to each end. Hole 55 is provided.
[0053]
Next, an operation of attaching the measurement gauge 50 having the above configuration will be described.
In the present embodiment, as shown in FIG. 8, an opening window 61 formed in an upper half of a bearing housing 60 containing the turbine rotor 4, more specifically, only an upper half (180 degrees in a circumferential direction) of the turbine rotor 4. Is defined as a measuring portion S1, a measuring gauge 50 is inserted from the gap C, and the measuring gauge 50 is wound around the turbine rotor 4.
[0054]
Further, in the torque measurement using the torque measuring device 10, since it is necessary to provide a total of two measurement units S in the axial direction of the turbine rotor 4, in the present embodiment, the same gap C is formed As the other measuring section S2, a measuring gauge 50 is separately attached.
[0055]
First, as preparation, the cover 61a provided on the opening window 61 is removed, and the upper half of the turbine rotor 4 is exposed in the measuring sections S1 and S2. Subsequently, marking is performed on the turbine rotor 4 at one of the measuring sections S1 and the other measuring section S2 with reference to the flange 61b provided at the circumferential end of the opening window 61.
[0056]
This work is to provide a reference line 64 (see reference numeral 64 in FIG. 9) for grasping the phase in the axial direction between the measurement units S1 and S2. The measuring gauge 50 is wound around the end of the measuring gauge 50. In detail, the reference line of the measuring unit S2 near the generator 5 is advanced by several millimeters in the normal rotation direction of the rotating shaft 4 with respect to the reference line of the measuring unit S1 near the gas turbine G for measurement convenience. It is marked at the corner.
[0057]
Subsequently, using a reference line that coincides with the circumferential direction of the turbine rotor 4 as a guide, a reference point 66, which is a reference for positioning each reflecting portion P, is equidistant from the reference line extending in the circumferential direction by an equal distance in the axial direction of the turbine rotor 4. In addition, a plurality of markings are made in the circumferential direction of the turbine rotor 4.
In the present embodiment, as shown in FIG. 9, the oil groove 65 provided inside the gap C (opening window 61) is a reference line extending in the circumferential direction, and is 30 mm from the edge 65a of the oil groove 65. Are marked with multiple marks.
[0058]
Subsequently, the operation moves to the positioning of the measurement gauge 50.
In this work, the measurement gauge 50 is attached to the upper half of the turbine rotor 4 according to the reference line 64 and the reference point 66 attached to the turbine rotor 4 in the preparation.
More specifically, one end of the measurement gauge 50 is aligned with a reference line 64 (hereinafter, referred to as an axial reference line 64) marked for adjusting the phase in the axial direction of each of the measuring units S1 and S2. The measurement gauge 50 is temporarily fixed to the turbine rotor 4 with the edge 51a of the measurement gauge 50 aligned with a reference point 66 (hereinafter referred to as a circumferential reference point 66) marked in the circumferential direction.
[0059]
Subsequently, in this state, marking is performed around each of the reflection portions P.
In this work, as shown in FIG. 10, marks 68 are formed at a total of four places along the edge of the opening 54 adjacent to the reflection part P and the edge 51a (51b) of the measurement gauge 50.
[0060]
Subsequently, the operation proceeds to the attaching operation of the reflection portion P.
In this work, as shown in FIG. 11, the measuring gauge 50 is once removed, a masking tape 69 is adhered according to the mark 68 corresponding to the outer shape of the reflection part P marked in the previous work, and a structuring bond or the like is placed inside the masking tape 69. Apply evenly.
[0061]
Subsequently, after the masking tape 69 is peeled off, the measurement gauge 50 is attached to the turbine rotor 4 again, and the position of the measurement gauge 50 is finally finely adjusted before the adhesive dries. More specifically, one end of the measurement gauge 50 is aligned with the axial reference line 64, and the edge 51 a of the measurement gauge 50 is aligned with a plurality of circumferential reference points 66.
Then, after finishing the fine adjustment in each part, the surface of each reflection part P is masked with a protective tape and pressed to wipe off excess adhesive, and the reflection part P is brought into close contact with the surface of the turbine rotor 4. Then, it is left to dry for several hours in this state.
[0062]
Subsequently, the operation proceeds to the work of attaching the measurement gauge 50 to the lower half of the turbine rotor 4.
In this work, the string 70 is tied to the hole 55 provided at the other end of the measurement gauge 50, and the string 70 is wound around the turbine rotor 4 following the measurement gauge 50 already fixed to the turbine rotor 4. The turbine rotor 4 is rotated half a direction in the direction, so that the lower half of the turbine rotor 4 faces the opening window 61.
[0063]
When rotating the turbine rotor 4, as shown in FIG. 12, the measurement gauge 50 is gradually wound around the turbine rotor 4 while the other end of the measurement gauge 50 is suspended above the turbine rotor 4 via the string 70. To go. By performing such an operation, the measurement gauge 50 can be wound around the turbine rotor 4 in a state where the surface of the measurement gauge 50 is in contact with the surface of the turbine rotor 4. 50 can be prevented from being stained or damaged.
[0064]
Subsequently, various markings are made in the same manner as in the operation of the upper half of the turbine rotor 4, and an adhesive is applied to the surface of the turbine rotor 4 where the reflection portion P is to be attached, to fix the measurement gauge 50.
Then, after the curing time of about 8 to 12 hours is obtained as the drying time of the adhesive, the operation is shifted to an operation of cutting off an unnecessary portion of the measurement gauge 50 from the cut portion while leaving the reflective portion P.
[0065]
The work of separating the measurement gauge 50 is performed in the following procedure.
First, both the surface of the turbine rotor 4 facing the opening portion 54 serving as the cutting portion 53 and the reflecting portion P are pressed with a fingertip (see FIG. 13). Next, the extra measuring gauge 50 (band-shaped member 51) is cut off with the other hand at the weak line 53a.
[0066]
In addition, in this separation work, when a defective bonding or the like is found in a part of the reflection part P, a reinforcing tape is attached to an end of the reflection part P, an adhesive is applied to a peeled part, and pressed again, The reflection part P is brought into close contact with the surface of the turbine rotor 4.
Subsequently, the turbine rotor 4 is rotated half a turn, and the same operation is performed in the remaining portion, thereby completing a series of operations related to the attachment of the reflection portion P.
[0067]
As described above, in the present embodiment, the bar code area B includes the long band-shaped member 51 having the linear edge portion 51a extending in the longitudinal direction, and the reflection portion P provided on the band-shaped member 51. The reflecting portion P is stuck to an appropriate position of the rotating shaft 4 by using a measuring gauge 50 provided at a right angle with respect to the edge 51a of the belt-shaped member 51.
[0068]
In other words, by arranging the edge 51a of the band-shaped member 51 on the reference line (oil groove 65) extending in the circumferential direction of the rotating shaft 4, the reference point 66, which is a reference for the sticking operation, is placed around the measurement gauge. Can be secured with much higher accuracy than when attaching each cord and the center line of the rotating shaft 4 so as to be parallel to each other.
[0069]
In addition, since the plurality of reflecting portions P are provided at equal intervals in the longitudinal direction of the belt-shaped member 51 (measurement gauge 50), the use of the measurement gauge 50 causes the respective reflection portions P to extend in the circumferential direction of the rotating shaft 4. At regular intervals and at regular angles.
[0070]
Further, on both sides of the reflecting portion P, there is provided a cutting portion 53 for cutting the band-shaped member 51 while leaving the reflecting portion P, so that the extra band-shaped member 51 can be cut off after the reflecting portion P is bonded. it can.
[0071]
In addition, one end of the band-shaped member 51 and the other end of the band-shaped member 51 are engaged under the condition that they abut against each other and that the edges 51a near each end are aligned on the same straight line L. Since the measurement gauge 50 is wound around a regular position, it can be grasped from the engagement state of each end of the band-shaped member 51 as well.
[0072]
The above-described embodiment is merely a preferred embodiment of the present invention, and details thereof can be changed as appropriate.
For example, in the above description, the entire length of the measurement gauge 50 is set to be substantially equal to the peripheral length of the turbine rotor 4, but it is not always necessary, and the measuring gauge 50 may be formed to have an overall length longer than the peripheral length.
[0073]
In this case, since the entire length of the belt-shaped member 51 is ensured to be equal to or greater than the circumference of the rotating shaft 4, as shown in FIG. The parallelism of each cord can also be obtained by overlapping and aligning the edges 51a on the same straight line L1.
[0074]
Further, in the present embodiment, the measurement gauge 50 having a length substantially equal to the circumference of the turbine rotor 4 is used, but the length is larger than the length of each cord in the barcode area B. In addition, a length that can be recognized as being sufficiently long is sufficient, and a length equal to the circumference of the rotating shaft 4 to be measured is not necessarily required.
In other words, the above-described various effects can be obtained by preparing a plurality of measurement gauges that are shorter than the circumference of the rotating shaft 4 and disposing these measurement gauges in the circumferential direction of the rotating shaft 4.
[0075]
Further, in the above description, both ends of the measurement gauge 50 are cut at a right angle to the edge 51a. For example, as shown in FIG. It is possible to determine the engagement state of the portions, and this allows more accurate bonding.
[0076]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a technique capable of easily and accurately attaching the reflecting portion of the measurement gauge to the rotation axis to be measured.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a combined cycle power plant.
FIG. 2 is a schematic configuration diagram of a torque measuring device according to the present embodiment.
FIG. 3 is an enlarged view of a barcode area provided in a reflection unit.
FIG. 4 is a diagram showing a state in which a reflection unit is accurately attached to a rotation axis to be measured.
FIG. 5 is a diagram showing a state in which a reflecting portion is bent and attached to a rotation axis to be measured.
FIG. 6 is an enlarged view of a main part of the measurement gauge shown in the present embodiment.
FIG. 7 is a diagram showing an engagement state of each end of the measurement gauge shown in the present embodiment.
FIG. 8 is an explanatory diagram for explaining how to use the measurement gauge.
FIG. 9 is a diagram showing a working state in a gap serving as a measuring unit.
FIG. 10 is a diagram illustrating a marking operation on the periphery of the reflection unit.
FIG. 11 is a diagram showing an operation of applying an adhesive to the surface of the turbine rotor.
FIG. 12 is a diagram showing an operation of winding a measurement gauge around a rotation axis.
FIG. 13 is a diagram showing a cutting operation in a cutting unit.
FIG. 14 is a diagram showing a modified example of the end shape of the measurement gauge according to the present embodiment.
FIG. 15 is a diagram showing a modified example of the end shape of the measurement gauge according to the present embodiment.
[Explanation of symbols]
1 Combined cycle power plant
2 Gas turbine body
3 Compressor
4 Turbine rotor (rotary shaft)
5 Generator
6 High-pressure steam turbine (HP turbine)
7 Medium-pressure steam turbine (IP turbine)
8 Low-pressure steam turbine (LP turbine)
10 Torque measuring device (optical measuring device)
11 Laser irradiation device
12 Beam adjustment device
13 Analysis device
14 First light receiving unit
15 Second light receiving unit
50 measuring gauge
51 belt-shaped member
51a edge
51b edge
53 Cutting part
53a Weak line
53b notch
54 opening
55 holes (connection part)
60 bearing housing
61 Open window
61a cover
61b flange
64 axial reference line
65 oil groove
65a Edge of oil groove
66 Circumferential reference point
68 mark
69 masking tape
70 string
B Barcode area
B1 white part
B2 groove
C gap
G gas turbine
P Reflector
S measuring unit
S1 measuring unit
S2 measuring unit
V contact line
X measurement point
T steam turbine
Y measurement point

Claims (10)

For optical measuring instruments having a barcode area that is attached to the outer peripheral surface of the rotating shaft to be measured and that has a barcode area that reflects the light beam applied to the rotating shaft and enters the light receiving section of the optical measuring instrument. Measurement gauge,
The measurement gauge includes a long band-shaped member having a linear edge extending in the longitudinal direction, and the reflection unit provided on the band-shaped member.
Each bar code area bar code area provided in the reflection part is provided at right angles to the edge of the band-shaped member with respect to the edge of the bar-shaped member. The measuring gauge for an optical measuring instrument according to claim 1, wherein the belt-shaped member has a length equal to or greater than a circumference of the rotation shaft. The measuring gauge for an optical measuring instrument according to claim 1, wherein a plurality of the reflecting portions are provided at equal intervals in a longitudinal direction of the band-shaped member. The measurement for an optical measuring instrument according to any one of claims 1 to 3, wherein a cutting portion for cutting the band-shaped member while leaving the reflection portion is provided on both sides of the reflection portion. gauge. The cut portion is provided with a weak line extending from one edge to the other edge of the band-shaped member, and an opening having the weak line on the outer edge and facing the surface of the rotating shaft is formed inside. The measuring gauge for an optical measuring instrument according to claim 4, wherein the measuring gauge is used. The measurement for an optical measuring instrument according to any one of claims 1 to 5, wherein a connection portion for connecting a jig for lifting the end portion is provided at an end of the band-shaped member. gauge. One end of the band-shaped member and the other end of the band-shaped member are engaged with each other in a state where they abut each other, and have a shape that engages on condition that the edges near each end are aligned on the same straight line. The measuring gauge for an optical measuring instrument according to claim 1, wherein the measuring gauge is provided. For optical measuring instruments having a barcode area that is attached to the outer peripheral surface of the rotating shaft to be measured and that has a barcode area that reflects the light beam applied to the rotating shaft and enters the light receiving section of the optical measuring instrument. A method for attaching a measurement gauge of the above to the rotating shaft,
A step of providing each code of the barcode region at a right angle on the basis of this edge on a long strip-shaped member having an edge formed by a straight line,
A step of aligning the linear edge with a reference line extending in a circumferential direction of the rotation axis and determining an attachment position of the reflection unit,
A method for mounting a measuring gauge, comprising: A step of connecting a jig for lifting the one end to one end of the band-shaped member,
Fixing the other end of the band-shaped member to the rotating shaft;
A step of rotating the rotating shaft while lifting one end of the band-shaped member through the jig,
The method according to claim 8, further comprising: Affixing the reflecting portion to the rotating shaft,
Cutting the band-shaped member while leaving the reflection portion;
The method according to claim 8, further comprising:

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