JP3420656B2 - Automatic narrow gap measuring instrument - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic gap measuring device for measuring a gap in a narrow portion, and more particularly, to an inner diameter portion of a rotor and a nozzle plate of a steam turbine. The present invention relates to a narrow space automatic gap measuring instrument suitable for measurement of a core during a measurement. 2. Description of the Related Art Conventionally, when it is necessary to measure a gap in a narrow part that is inaccessible and invisible,
Various measures have been devised for the measurement. For example, in a steam turbine, as shown in FIG. 9, when measuring a gap immediately below the rotor 1 in the core measurement between the rotor 1 and the inner diameter of the nozzle partition 2,
Parallel round pin 3 for measurement with a diameter corresponding to the gap at the measurement position
In addition, the gap is measured by using a tool to which a long and thin round bar 4 having high flexibility is attached. That is, first, the measuring member 5 holds the handle of the round bar 4 and holds the parallel round pin 3 in parallel with the rotor 1.
Another measuring assistant 6 standing on the opposite side along the inner diameter of the nozzle partition 2 and standing on the other side combines several liner shims 7 with the thickness that is insufficient with the parallel round pins 3. insert. Then, the measuring person 5 puts the parallel round pin 3 on the liner shim 7 and adjusts the thickness of the liner shim 7 based on the hardness of the liner shim 7 based on years of experience and intuition. The total of the thicknesses of No. 7 is the measurement dimension. [0005] However, such a method has the following problems. (1) Since the parallel round pin 3 cannot always be held parallel to the rotor 1, not only the accuracy is lowered, but also the parallel round pin 3 may be inclined and cannot move. (2) There is a problem in the measurement accuracy because the hardness of the measurement person 5 depends on the appropriate hardness. (3) Measurement takes time. [0008] As described above, the gap between the rotor of the steam turbine and the inner diameter portion of the nozzle partition plate, etc.
Conventionally, when measuring a gap in a narrow part, measurement accuracy is poor and lacks reliability, measurement requires manual labor and skill,
There was a problem that measurement took time. SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional situation, and can measure a gap in a narrow portion easily, quickly, and accurately without skill. It is an object of the present invention to provide a narrow space automatic gap measuring instrument which can save labor and improve reliability. That is, an automatic gap measuring instrument for a narrow portion according to the present invention comprises a guide member movable along a lower surface of the narrow portion and an upper surface of the narrow portion abutting on the guide member. A detecting unit that measures the gap between the narrowed portions based on the expanded and contracted state of the sensor, and is connected to the detecting unit so that the detecting unit can be inserted into a desired position in the narrowed portion. A bendable flexible arm, an operation unit for remotely executing the gap measurement by the detection unit, and a position directly below the detection unit that detects that the detection unit is in a horizontal state.
A detection mechanism, the result and prior to the gap measurement by the detection unit
A display unit for displaying the output detected by the head-down detection mechanism at a remote position. In the narrow gap automatic gap measuring instrument of the present invention having the above-mentioned structure, the detecting section is inserted into the narrow section for measuring the gap by the flexible arm, and the detecting section is telescopically operated by the operating section so as to be able to expand and contract. The result of the measurement can be displayed on the display unit by measuring the gap by the sensor. Therefore, it is possible to easily and accurately measure the gap in the narrow portion without requiring any skill, and it is possible to save labor and improve the reliability of the measurement of the narrow portion gap. An embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows the overall configuration of an automatic measuring apparatus for a narrow portion according to an embodiment of the present invention.
Is a detector inserted into a narrow part. This detector 10
Is connected to one end of a flexible arm 11, and the other end of the flexible arm 11 is provided with a hand switch 12 for remotely operating the detector 10. The measurement signal of the detector 10 is input to the display 13, and the measurement signal is digitized and displayed on the display 13. The display 13 is provided with three measurement value display windows, which can display three measurement results, and further has a built-in printer so that the measurement results can be printed out. FIG. 2 shows the measurement position of the gap in the core measurement between the rotor 1 of the steam turbine and the inner diameter portion of the nozzle partition 2 which is suitable for measurement by the automatic gap measuring device for a narrow portion of this embodiment. In the measurement of the gap in the core measurement, the measurement is performed at the three points A, B, and C on the left and right sides and the lower part shown in FIG. In this embodiment, the detector 10 is inserted into the measurement position using the flexible arm 11. For this reason, the flexible arm 11 needs to bend freely according to the size of the diameter of the rotor 1 of the steam turbine. It is necessary to A data signal cable and an optical fiber cable are built in the flexible arm 11. Next, the configuration of the detector 10 will be described in more detail. FIGS. 3 and 4 show a state where the detector 10 is mounted on the nozzle partition 2 of the steam turbine and the gap between the detector 10 and the rotor 1 is measured. As shown in these drawings, the detector 10 includes a base 21, and upper guide rollers 22 are provided on both sides of the base 21. A lower guide roller support member 25 provided with a lower guide roller 24 is provided on a lower portion of the base 21 via a coil-shaped spring 23 so as to be movable vertically in the figure. Locked. The lower and upper guide rollers 24 are positioned so that the lower guide roller 24 is located in the labyrinth mounting groove 2a of the nozzle partition plate 2 or the packing casing, and the upper guide roller 22 is located at the inner diameter of the nozzle partition plate 2. 2
By arranging the upper and lower guide rollers 2 and 24, the end of the nozzle partition plate 2 is sandwiched between the upper and lower guide rollers 22 and 24 by the elastic force of the spring 23.
2 is held in a state of being in close contact with the inner diameter of the nozzle partition plate 2. In this state, the detector 10 can be moved to a desired measurement position by remote control using the flexible arm 11. A sensor support 26 is provided above the base 21, and a sensor 27 is provided above the sensor support 26 so that a distal end thereof protrudes. The sensor 27 includes a detection contact 27b which is elastically and vertically movable by a spring 27a, and detects the movement of the detection contact 27b.
The gap measurement can be performed by detecting with a differential transformer 27d via a detection rod 27c provided below 7b. That is, the detecting contact 27b is urged upward by the spring 27a, whereby the upper end of the detecting contact 27b is brought into contact with the outer diameter of the rotor 1, and as described above, Since the upper guide roller 22 is held in close contact with the inner diameter of the nozzle partition 2, the position of the detection contact 27b is
It changes according to the size of the gap between the nozzle and the nozzle plate 2. The change is converted into an electric signal by the differential transformer 27d via the detection rod 27c, and the width of these gaps can be measured. An electric signal from the differential transformer 27d is led out by a lead wire in the flexible arm 11,
By pressing the measurement switch 12a of the hand switch 12 shown in FIG. 5, the display 13 shown in FIG.
Is configured to digitally display the measured value on the display window 13a. In FIG. 5, 12b is a printer switch, 12c is a reset switch, 12d is a difference switch, and 12e is a display lamp just below. In FIG. 6, 13b is a printer switch, 13c is a reset switch, 13d is a power switch, and 13e is a printer. The difference switch 12d is for displaying the relative difference between the three measured gaps.
The position of the core of the nozzle plate 2 with respect to the rotor 1 can be easily obtained. The above-mentioned sensor support 26 is provided with a directly below detection mechanism 28. This directly below detection mechanism 2
As shown in FIG. 7, a lower detection weight 28 rotatable around a support shaft 28a and having a detection hole 28b formed therein is provided.
c, an optical fiber cable 28 provided on both sides of the directly below detection weight 28c with the detection hole 28b interposed therebetween.
d, 28e. When the detector 10 is located directly below the rotor 1 and the detector 10 is horizontal, the detection weight 28 just below the detector 1
c through the detection hole 28b.
Light arrives from one of d and 28e to the other, whereby the detector 10 can detect that it is located directly below the rotor 1. This detection result is displayed on the display lamp 12e directly below the hand switch 12 described above. The sensor support 26 described above has a jacking bolt 29 and a fixing bolt 30 with respect to the base 21.
The height from the base 21 is adjusted by a jacking bolt 29 and fixed by a fixing bolt 30. This is because the gap width of the narrow portion that can be measured by the present apparatus is limited by the stroke of the sensor 27,
Is made to be able to be raised to further expand the measurable range. Next, a measurement procedure using the automatic measuring device for a narrow portion of this embodiment having the above configuration will be described more specifically. First, the measuring instrument 10 is inserted into the gap between the rotor 1 and the nozzle partition 2 and is arranged at a measuring point on one side, and the measuring switch 12a of the hand switch 12 is pressed. After the reading of the measurement point is input, the detector 10 is inserted by the flexible arm 11 right below the rotor 1. When the detector 10 is positioned directly below, the detection hole 28b of the detection weight 28c is aligned with the axis of the optical fiber cables 28d and 28e, and the display lamp 12e is turned on.
Press 2a. When the reading of the measurement point is input,
The detector 10 is further pushed by the flexible arm 11, moved to a position near the horizontal which is a measurement point on the opposite side, and the measurement switch 12a is pressed again to input data. The input left, right, and lower readings are digitally displayed on three display windows 13 a of the display 13. By operating the difference switch 12d, the measured relative difference between the three gaps can be displayed, whereby the position of the core of the nozzle plate 2 with respect to the rotor 1 can be easily obtained. The displayed reading value and relative difference value can be printed out by operating the printer switches 12b and 13b whenever displayed. The automatic gap measuring device for a narrow part according to this embodiment configured as described above has the following effects. In the conventional measuring method, the measured value at the lower part is equal to 0.
Although it was difficult to require an accuracy of 1 mm or less, in the present embodiment, measurement can be performed with an accuracy of 0.02 mm, and the accuracy can be improved and the reliability of the measured value can be improved. Since the measurement can be performed remotely, it is now possible to perform the measurement by one person instead of a two-person operation, thereby saving labor. In the conventional method, the measurement time is one paragraph (left,
It took 10 minutes or more for the right and bottom three points measurement), but in this embodiment, it can be measured in one minute and the measurement time is 1 /
Can be reduced to 10. In the conventional method, since the measurement is performed based on experience and intuition, considerable skill is required, and the measurement cannot be performed unless a so-called skilled person. According to this embodiment, however, anyone can operate the device on the spot. Listening to the method, you can immediately measure with high accuracy. In the above embodiment, an example in which the present invention is applied to the measurement of the gap between the rotor 1 of the steam turbine and the nozzle plate 2 has been described. However, the present invention is not limited to this embodiment. It can be applied to gap measurement of any narrow part. For example, as shown in FIG. 8, by changing the guide roller 40 of the detector 10 for flat traveling, the dimensions and parallelism between two opposing planes (plane a and plane b) of a structure such as an apparatus or a pier. The degree can be measured. As described above, according to the narrow gap automatic gap measuring instrument of the present invention, the gap in the narrow gap can be measured easily, quickly and accurately without skill. As a result, it is possible to save labor and improve the reliability of the narrow gap measurement.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration of an automatic measuring device for a narrow portion according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a measurement position. FIG. 3 is a diagram showing a configuration of the detector of FIG. 1; FIG. 4 is a diagram showing a configuration of the detector of FIG. 1; FIG. 5 is a diagram showing a configuration of a hand switch of FIG. 1; FIG. 6 is a diagram showing a configuration of the display device of FIG. 1; FIG. 7 is a diagram showing a configuration of a detector directly below in FIG. 1; FIG. 8 is a diagram showing a configuration of another embodiment. FIG. 9 is a diagram for explaining a conventional measurement method. [Description of Signs] 10 Detector 11 Flexible arm 12 Hand switch 13 Display

Claims (1)

(57) [Claim 1] A guide member which is movable along a lower surface of a narrow portion, and a stretchable sensor which is in contact with an upper surface of the narrow portion. A detecting unit that measures a gap between the narrow portions based on a state of expansion and contraction of a sensor; a flexible arm that is connected to the detecting unit and that is capable of inserting the detecting unit into a desired position in the narrow portion; An operation unit for performing gap measurement by remote operation, and a direct detection for detecting that the detection unit is in a horizontal state
Mechanism, a result of gap measurement by the detection unit, and the underneath detector
A display unit for displaying an output detected at a remote location at a remote location.