JP2000304501A - Flatness measuring method and device of sliding surface of thrust rotary plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flatness measuring method excellent in precision, reproducibility and workability regarding a thrust rotary plate of a large-sized rotary machine. SOLUTION: A plurality of measuring points N (N0-Nn) are marked on a measuring straight line 3 arranged at a proper position on the sliding surface 2 of a thrust rotary plate 1. An electric level 4 is so put on the sliding surface 2 that its contacts 5 come to positions on the adjacent measuring points, and reads the gradient G (G1-Gn) at the time. Difference of height between the respective measuring points is obtained from the gradient G and the distance P between the measuring points. The above difference of height of obtained all over the measuring straight line 3, thereby obtaining the magnitude of undulation of a sectional shape of the sliding surface at the straight line part and its distributed state (flatness). The plurality of measuring straight lines 3 are arranged on the whole sliding surface, and the same measurements are performed, thereby recognizing flatnesses of the whole sliding surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring the flatness of a sliding surface of a thrust rotary plate of a rotor of a large rotary machine or the like.

[0002]

2. Description of the Related Art For example, in a large rotating machine on which a large thrust load acts as represented by a water turbine generator, a contact surface (slip surface) between a stator and a rotor in a thrust bearing has a thrust load direction. Large surface pressure acts on Under normal conditions, there is no lubricating oil film between the two sliding surfaces, so the two sliding surfaces do not directly contact each other, but sometimes this oil film is not generated and the two sliding surfaces come into direct contact. May be damaged. One of the causes of such a situation is the problem of the shape of the slip surface.

[0003] For the above reasons, it is necessary to control the flatness of the thrust rotating plate constituting the sliding surface on the rotor side with a precision of μm at the time of manufacturing or periodic inspection. . In order to perform such a precise measurement, it is ideal that the thrust rotating plate is mounted on a processing machine or a stationary type three-dimensional measuring device or the like, and is ideally measured using a dedicated measuring element. However, such measurement is difficult when there is no such device, when the thrust rotary plate is attached to the rotor shaft, and when the rotor is inserted into the stator.

A currently used method for measuring the flatness of the sliding surface of the thrust rotary plate will be described with reference to FIG. FIG.
(A) is an explanatory view of a method of measuring flatness when the sliding surface 2 of the thrust rotary plate 1 is upward. This measurement method is
At an appropriate position of the measuring straight line 3 on the sliding surface 2 of the thrust rotary plate 1, two block gauges 17 machined so as to be equal in height are placed, and a calibrated straight edge 18 is passed over the two, and a straight The distance D between the edge 18 and the sliding surface 2 of the thrust rotary plate 1 is mechanically measured by a measurer using a cylinder gauge 19.

FIG. 6B is an explanatory view of a measuring method when the sliding surface 2 of the thrust rotary plate 1 faces downward. In this case, instead of the block gauge 17, a magnet block 20 machined so as to have the same height is sandwiched between the straight edge 18 and the sliding surface 2 of the thrust rotary plate 1, and the magnetic force supports the straight edge 18. And measure the interval D.

In both cases of FIGS. 6 (a) and 6 (b), the flatness in the measured straight line portion is obtained from the amount of change of the measured value D along the measured straight line 3. Then, as shown in FIG. 6 (c), several such measurement straight lines 3 are determined on the entire sliding surface of the thrust rotating plate, and the same measurement is performed for each of them, thereby obtaining the entire sliding surface 2 of the thrust rotating plate 1. Had to be determined.

[0007]

However, in the measurement using the straight edge 18 and the cylinder gauge 19 described above, a processing machine or a three-dimensional measuring device may be used due to a measurement error of a measurer or an influence of a deformation amount of the straight edge 18. There is a problem that the accuracy and reproducibility of the measurement result are poor compared to the case where the measurement is performed by the above method.

In addition, as the radial dimension of the sliding surface 2 of the thrust rotary plate 1 increases, the length and weight of the straight edge 18 must be used in accordance with the radius, and the state in which the rotor is inserted into the stator is required. If sufficient space for measurement cannot be secured as in the case of, the workability of measurement will deteriorate,
The burden on measurement workers was great. Further, when the sliding surface 2 of the thrust rotary plate 1 faces downward, there is a danger of the straight edge 18 falling and there is a problem in safety.

Therefore, the present invention provides high accuracy even when the thrust rotary plate is mounted on the rotor shaft and the rotor is inserted into the stator without using a processing machine or a three-dimensional measuring device. It is an object of the present invention to provide a method and an apparatus for measuring flatness with good reproducibility and measurement workability.

[0010]

According to a first aspect of the present invention, there is provided a method for measuring the flatness of a slip surface of a thrust rotating plate, wherein a measurement straight line is defined on the slip surface of the thrust rotating plate of the rotor, and a plurality of straight lines on the measurement straight line are determined. At a measurement point, an inclination level from a horizontal plane is measured by an electric level, and flatness in a cross-sectional shape at the measurement straight line portion of the sliding surface of the thrust rotary plate is determined based on the inclination amount.

According to the flatness measuring method of the thrust rotating plate slip surface according to the first aspect of the present invention, at a plurality of measurement points on the thrust rotating plate slip surface of the rotor, the inclination amount from the horizontal plane is measured by an electric level. I do. Then, the flatness in the cross-sectional shape of the sliding surface of the thrust rotary plate is obtained based on the inclination amount.

According to a second aspect of the present invention, there is provided a method for measuring the flatness of a sliding surface of a thrust rotary plate according to the first aspect of the present invention.
A plurality of the measurement straight lines are set on the sliding surface of the thrust rotating plate, and the flatness of the entire sliding surface of the thrust rotating plate is obtained.

According to a second aspect of the present invention, there is provided a method for measuring the flatness of a sliding surface of a thrust rotary plate, wherein the electric level is measured along a plurality of measurement straight lines on the slip surface of the thrust rotary plate. Is applied to determine the flatness of the entire sliding surface of the thrust rotary plate.

According to a third aspect of the present invention, there is provided a method for measuring the flatness of a sliding surface of a thrust rotary plate according to the first aspect of the present invention.
The flatness is calculated based on the amount of inclination measured by the electric level and a distance between each measurement point.

According to a third aspect of the present invention, in the method for measuring the flatness of the sliding surface of the thrust rotary plate, in addition to the operation of the first aspect, based on the amount of inclination measured by the electric level and the distance between each measuring point. Calculate the flatness.

According to a fourth aspect of the present invention, there is provided a method for measuring the flatness of a sliding surface of a thrust rotary plate according to the first aspect of the present invention.
In the measurement of the inclination amount by the electric level, the electric level is adsorbed to the thrust rotary plate slip surface by a suction tool so that the contactor contacts the thrust rotary plate slip surface. I do.

According to a fourth aspect of the present invention, in the method for measuring flatness of a sliding surface of a thrust rotary plate, in addition to the operation of the first aspect, a contact of an electric level is provided for the downwardly sliding surface of the thrust rotary plate. Then, the electric level is suctioned to the sliding surface of the thrust rotating plate with a suction tool so that the sliding surface comes into contact with the sliding surface of the thrust rotating plate, and the amount of inclination of the sliding surface is measured.

According to a fifth aspect of the present invention, there is provided a method for measuring the flatness of a sliding surface of a thrust rotary plate according to the first aspect of the invention.
In the measurement of the inclination amount by the electric level, the electric level is housed in a measuring jig provided with an adsorbing device that adsorbs to the sliding surface of the thrust rotary plate, and the measuring jig is moved by the thrust rotary plate sliding. It is characterized in that it is adsorbed on a surface.

According to a fifth aspect of the present invention, there is provided a method for measuring the flatness of a thrust rotary plate slip surface, wherein the downward thrust rotary plate slip surface has a thrust rotary plate slip surface. The electric level is housed in a measuring jig provided with an adsorbing device for adsorbing, the measuring jig is adsorbed to the sliding surface of the thrust rotary plate, and the inclination of the sliding surface is measured by the stored electric level.

A flatness measuring device for a sliding surface of a thrust rotating plate according to a sixth aspect of the present invention comprises: an electric level for measuring an inclination amount from a horizontal plane at a plurality of measurement points on the sliding surface of the thrust rotating plate; A computer for obtaining the flatness of the sliding surface of the thrust rotary plate based on the inclination amount measured by the electric level; and an output device for outputting the flatness obtained by the computer.

In the flatness measuring device for a sliding surface of a thrust rotating plate according to a sixth aspect of the present invention, an inclination is measured from a horizontal plane at a plurality of measurement points on the sliding surface of the thrust rotating plate by an electric level. The flatness of the sliding surface of the thrust rotary plate is determined by a computer based on the amount of tilt measured by the electric level. Then, the flatness calculated by the computer is output to the output device.

According to the seventh aspect of the present invention, there is provided an apparatus for measuring flatness of a sliding surface of a thrust rotary plate according to the sixth aspect of the present invention.
A moving device for automatically moving the electric level is provided at a measurement point on the sliding surface of the thrust rotary plate.

In the flatness measuring device for a sliding surface of a thrust rotary plate according to a seventh aspect of the present invention, in addition to the operation of the sixth aspect, an electric level is set at a measuring point of the sliding surface of the thrust rotary plate by a moving device. Move automatically. This enables automatic measurement.

According to the eighth aspect of the present invention, in the flatness measuring device for a sliding surface of a thrust rotating plate, in the invention of the sixth or seventh aspect, the electric level is such that a contact is provided on the sliding surface of the thrust rotating plate. It is characterized in that it is provided with a suction tool that sucks the sliding surface of the thrust rotary plate so as to make contact.

The thrust rotary plate slip surface flatness measuring apparatus according to the eighth aspect of the present invention is the sixth or seventh aspect.
In addition to the operation of the invention, the electric level is adsorbed on the sliding surface of the thrust rotating plate by the suction tool, and the contact thereof comes into contact with the sliding surface of the thrust rotating plate.

According to a ninth aspect of the present invention, in the thrust rotary plate slip surface flatness measuring apparatus according to any one of the sixth to eighth aspects, the electric level is provided with the thrust rotary plate slip surface. Characterized in that it is housed in a measuring jig provided with an adsorbing device for adsorbing.

According to a ninth aspect of the present invention, in the flatness measuring device for a sliding surface of a thrust rotary plate, in addition to the operation of the sixth aspect, a measuring jig accommodating an electric level is provided. Is adsorbed on the sliding surface of the thrust rotating plate by the suction device, and the electric level measures the amount of inclination of the sliding surface of the thrust rotating plate in the measuring jig.

[0028]

Embodiments of the present invention will be described below. FIG. 1 is an explanatory view of a method for measuring the flatness of a sliding surface of a thrust rotary plate according to the first embodiment of the present invention.
FIG. 1A is an explanatory diagram of a measurement procedure according to the first embodiment of the present invention, and FIG. 1B is a calculation method for calculating flatness of a surface to be measured from an amount of tilt obtained from an electric level. FIG.

As shown in FIG. 1A, a measurement straight line 3 is set at an appropriate position on the slip surface 2 of the thrust rotary plate 1,
Equal intervals P on the measurement straight line 3 from the end point of the slip surface 2 in order.
Marks the measurement points N ₀ , N _{1 to} N _n . Then, the electric level 4 is placed so that the contact 5 of the electric level 4 comes at the positions of the measurement points N ₀ and N ₁ , and the inclination amount G ₁ , which is the indicated value of the electric level 4 at that time, is read. Next, the same measurement is performed at the measurement points N ₁ and N ₂ , and this is repeated until the electric level 4 reaches the measurement point Nn.

Next, determine the altitude difference dH between the measuring points from the inclination amount G _k is an instruction value of the electric level gauge 4 and the measurement point interval P. When the inclination level when the electric level 4 is placed between the measurement points N ₀ and N ₁ is represented by G ₁ and the altitude difference is represented by dH ₁ , the inclination amount G
_{When 1} is obtained as an angle, the following equation (1) holds.

DH ₁ = P · tanG ₁ (1)

That is, an altitude difference dH _k between an arbitrary measuring point N _k−1 and a measuring point N _k adjacent to each other is expressed by the following equation (2).

DH _k = P · tanG _k (2)

Then, the elevation difference dH _k is calculated as the slip surface 2
By the end superimposing in sequence, Motomari is altitude difference HS _k of the measurement point N ₀ end point of the sliding surface 2 and the measurement points N _k, represented by equation (3).

[0035]

(Equation 1)

[0036] Although also altitude difference HS _n between one end point N ₀ and the other end point N _n of the sliding surface 2 of the thrust rotating plate 1 obtained by the equation (3), the altitude difference HS _n is thrust rotating plate 1
It becomes to mean the inclination from the horizontal plane L ₁ of the straight line L ₂ passing through the end points of the sliding surface 2. Since the flatness of the sliding surfaces 2 must seek as a displacement amount of each measurement point of time relative to the straight line L _2, flatness HR _k at each measurement point N _k of the sliding surface 2 has corrected this HS _n min This is expressed by the following equation (4).

HR _k = HS _k − (kp / np) · HS _n (4)

By setting a plurality of measurement straight lines 3 on the slip surface 2 of the thrust rotary plate 1 and processing the measured values as described above, the flatness of the entire thrust rotary plate 1 is obtained.

FIG. 2 is an explanatory diagram of the electric level 4 according to the first embodiment of the present invention. In FIG. 2A, the contact 5 itself of the electric level 4 is constituted by a suction tool 10.
In the measurement of the amount of inclination G by the electric level 4, the electric level 4 is attached to the thrust rotary plate slip surface 2 by the suction tool 10 so that the contact 5 contacts the downward thrust rotary plate slip surface 2. Adsorb.

FIG. 2B shows a configuration in which the electric level 4 is housed in a measuring jig 9 provided with a suction tool 10. In measuring the amount of inclination G by the electric level 4, the measuring jig 9 is attracted to the sliding surface 2 of the thrust rotary plate, and the amount of inclination G of the electric level 4 in this case is measured.

As described above, since the electric level 4 is attracted to the thrust rotating plate sliding surface 2 by using the attracting tool 10 such as a magnet, even if the thrust rotating plate sliding surface 2 is in the horizontal or downward state, the inclination thereof can be reduced. The quantity G can be measured.

As described above, according to the first embodiment, the flatness can be measured by using only the electric level 4 which is smaller and lighter than the straight edge 18, so that the measurer can be saved. Humanization and burden reduction are possible. In addition, the measurement work is performed only by setting the electric level 4 to the measuring point, and the measured value is automatically displayed on the display section of the electric level 4, so that the reproducibility is stable regardless of the skill and habit of the measurer. Measurement with a certain point becomes possible.

Further, since the electric level 4 can be inserted into a narrow place, even if a sufficient space for measurement cannot be secured with the rotor incorporated in the stator, the sliding of the thrust rotary plate 1 can be performed. Measurement on the entire surface 2 is also possible. Further, when the electric level 4 is sucked to the thrust rotating plate slip surface 2 by using the suction tool 10, the inclination G of the thrust rotating plate slip surface 2 in the horizontal or downward state can be measured.

The method of calculating the flatness of the slip surface 2 of the thrust rotary plate 1 is based on the inclination amount G, which is the direct output value of the electric level 4, and the distance P between the measurement points. Since the flatness in the cross-sectional shape of the portion of the measurement straight line 3 is obtained, the magnitude of the undulation in the cross-sectional shape and the distribution thereof can be grasped, and the flatness can be obtained with high accuracy.

Next, a second embodiment of the present invention will be described. FIG. 3 is a configuration diagram of a flatness measuring apparatus for a slip surface of a thrust rotary plate according to a second embodiment of the present invention.

The inclination amounts G at a plurality of measurement points on the sliding surface 2 of the thrust rotary plate are measured by the electric level 4 and input to the computer 7 via the cable 6. In this case, the signal may be converted into a signal such as an infrared ray or a radio wave and input to the computer 7 wirelessly. The computer 7 calculates the flatness of the sliding surface 2 of the thrust rotary plate according to the equations (1) to (4) based on the inclination G input in real time. The flatness obtained by the computer 7 is output to the output device 8 and is notified to the operator in real time. A display device or a printing device is used as the output device.

FIG. 4 is an explanatory diagram of a moving device of the electric level 9 used when the flatness of the sliding surface 2 of the thrust rotary plate is determined in real time by the computer 7. FIG. 4 shows a case in which the thrust rotating plate sliding surface 2 faces downward. However, the present invention is also applicable to a case where the thrust rotating plate sliding surface 2 faces sideways or upward.

A table 12 is provided on a cart 11 of the self-propelled moving device. On this table 12, a measuring jig 9 accommodating the electric level 4 or an electric level provided with a suction tool 10 is provided. 4 is mounted. FIG. 4 shows a case where a measuring jig 9 containing the electric level 4 is mounted. Then, along the measurement straight line 3 on the slip surface 2, the electric level 4
The trolley 11 is set so that it can be moved.

Next, the carriage 11 is caused to travel by the traveling device 13 and is moved until the electric level 4 or the measuring jig 9 comes directly below the first measuring point. When the electric level 4 or the measuring jig 9 is located immediately below the measuring point, the table elevating device 1
4 is operated to raise the table 12 until the suction tool 10 comes into contact with the sliding surface 2. Here, the suction device 10 is operated to perform the measurement.

The measured values are automatically read by the computer 7,
When the measurement at the measurement point is completed, the suction device 10 is released,
The table 12 is lowered. Then, the carriage 11 is moved by the traveling device 13 to the next measurement point, and the same operation and measurement are performed. This is repeated until the last measurement point.

The measured value in this case may be read by a person instead of automatically by the computer 7. That is, a moving device that does not connect the electric level 4 to the computer 7 may be used.

As described above, according to the second embodiment, when the electric level 4 is connected to the computer 7, the measurer reads the display value of the electric level 4 and writes it on the recording paper. Since it is not necessary to perform an operation for calculating the flatness from the written and displayed values, it is possible to eliminate a human error that may occur in the process. In addition, it is possible to increase the efficiency of the measurement operation.

Further, since the self-propelled moving device is used, all the measuring operations can be automated and remote-controlled, and the measurement can be performed in a narrow place or a dangerous place where it is difficult to perform the measurement in the human system. Furthermore, by installing such a self-propelled moving device in the rotor thrust bearing device, measurement can be performed even in the assembled state of the thrust bearing, and the thrust bearing disassembly work for the measurement is not required. Can be.

FIG. 5 is an explanatory view of a case where the method for measuring the flatness of the sliding surface of the thrust rotary plate according to the present invention is applied to the operation of fastening the thrust rotary plate to the rotor shaft. The thrust rotary plate 1 is fixed to the rotor shaft 15 by tightening bolts 16. However, if the tightening force is not appropriate, the correct shape 2a of the sliding surface 2 cannot be obtained. That is, when the tightening force is insufficient, the slip surface has a shape like 2b in FIG. 5, and when the tightening force is excessive, it has a shape like 2c in FIG.

During the tightening operation of the tightening bolts, the flatness measuring method of the present invention is applied to measure. Thereby, it is possible to know whether or not the shape of the slip surface 2 is the correct shape 2a, and it is possible to determine whether the bolt tightening force is appropriate, insufficient, or excessive. Therefore, since an appropriate magnitude of the tightening force can be instructed to the tightening operator side, it is possible to accurately perform the tightening operation of the thrust rotary plate 1, and the flatness measuring method of the present invention is used for controlling the tightening force. It can be used as a means.

[0056]

As described above, according to the present invention, the flatness of the sliding surface of the thrust rotary plate of a large rotary machine is measured using an electric level which is smaller and lighter than a straight edge. This makes it possible to save labor and reduce the burden on workers, and to improve work safety. Further, since the measurement operation is simple, the measurement result is hardly affected by the skill and habit of the measurer, and the accuracy and reproducibility are improved as compared with the conventional method.

Further, by using an appropriate jig or auxiliary tool, measurement can be performed regardless of the posture of the thrust rotary plate.

Since the measured value of the electric level is directly output in the form of an electric signal, the measurement can be easily automated, and the remote measurement can be performed by remote control in combination with the moving device of the electric level. Therefore, measurement can be performed in a narrow place or a dangerous place where it is difficult for a human to measure. Further, by performing the flatness measurement during the tightening operation of the tightening bolt, it is possible to determine whether the bolt tightening force is appropriate, and it is possible to manage the tightening force.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method for measuring the flatness of a sliding surface of a thrust rotating plate according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an electric level according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a flatness measuring device for a sliding surface of a thrust rotary plate according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a moving device of an electric level used when a flatness of a sliding surface of a thrust rotary plate is determined in real time by a computer according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a case where the method for measuring the flatness of a slip surface of a thrust rotary plate according to the present invention is applied to a work of fastening the thrust rotary plate to a rotor shaft.

FIG. 6 is an explanatory diagram of a conventional method for measuring the flatness of a slip surface of a thrust rotary plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thrust rotating plate 2 Sliding surface 3 Measurement straight line 4 Electric level 5 Contactor 6 Signal cable 7 Calculator 8 Output device 9 Measurement jig 10 Suction tool 11 Measurement trolley 12 Measurement table 13 Dolly moving device 14 Table elevating device 15 Rotor shaft 16 Tightening bolt 17 Block gauge 18 Straight edge 19 Cylinder gauge 20 Magnet block

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F062 AA41 AA55 AA71 BB14 BC31 CC22 CC23 CC30 GG24 GG25 GG31 LL07 LL12 2F063 AA14 AA31 AA45 BA21 BB05 BC05 BD11 CA11 CA13 JA05 MA04 MA06

Claims (9)

[Claims] 1. A measurement straight line is defined on a sliding surface of a thrust rotating plate of a rotor, and at a plurality of measurement points on the measurement straight line, an inclination level from a horizontal plane is measured by an electric level, and based on the inclination amount, A flatness measurement method for a slip surface of a thrust rotary plate, wherein flatness in a cross-sectional shape of the slip surface of the thrust rotary plate at the measurement straight line portion is obtained. 2. The thrust rotary plate slip according to claim 1, wherein a plurality of the measurement straight lines are set on the thrust rotary plate slip surface, and the flatness of the entire thrust rotary plate slip surface is determined. Surface flatness measurement method. 3. The flatness of the sliding surface of the thrust rotary plate according to claim 1, wherein the flatness is calculated based on the amount of inclination measured by the electric level and a distance between each measurement point. Degree measurement method. 4. A method for measuring the amount of tilt by the electric level, wherein the electric level is sucked to the sliding surface of the thrust rotating plate by a suction tool such that a contact thereof comes into contact with the sliding surface of the thrust rotating plate. 2. The method for measuring flatness of a sliding surface of a thrust rotary plate according to claim 1, wherein: 5. In the measurement of the amount of inclination by the electric level, the electric level is housed in a measuring jig provided with an adsorbing device for adsorbing to the sliding surface of the thrust rotary plate, and the measuring jig is mounted. The method for measuring flatness of a slip surface of a thrust rotating plate according to claim 1, wherein the flat surface is suctioned to the slip surface of the thrust rotating plate. 6. An electric level for measuring inclination amounts from a horizontal plane at a plurality of measurement points on a sliding surface of a thrust rotating plate of a rotor, and the thrust rotating plate based on the inclination amounts measured by the electric level. A flatness measuring apparatus for a slip surface of a thrust rotary plate, comprising: a calculator for determining the flatness of a slip surface; and an output device for outputting the flatness determined by the computer. 7. The flatness measurement of the thrust rotary plate slip surface according to claim 6, further comprising a moving device for automatically moving the electric level at a measurement point of the thrust rotary plate slip surface. apparatus. 8. The electric level according to claim 6, wherein the electric level includes an adsorbing device for adsorbing the thrust rotary plate slip surface so that a contact thereof contacts the thrust rotary plate slip surface. Item 7. A flatness measuring device for a sliding surface of a thrust rotary plate according to item 7. 9. The measuring device according to claim 6, wherein the electric level is housed in a measuring jig provided with an adsorbing device for adsorbing the sliding surface of the thrust rotary plate.
Item 3. The flatness measuring device for a sliding surface of a thrust rotary plate according to the above item.