JP4638284B2 - Moving blade implantation measurement tool - Google Patents

Description

  The present invention relates to a moving blade implantation measuring tool for measuring the position of a turbine moving blade ("falling amount" with respect to a radial line) installed on a rotor in a steam turbine, a gas turbine, or the like.

  In a steam turbine, a gas turbine, or the like, a structure in which a turbine rotor blade is installed on a rotor is generally a method in which a lower portion of the rotor blade is implanted into a blade groove provided on the outer peripheral side of the rotor (or a disk portion of the rotor). It is.

  The shape of the lower part of the rotor blade is formed in a “T” shape or “serration” shape, and the rotor blade groove is formed so as to correspond to the shape of the rotor blade. It is inserted into the blade groove of the rotor and slid and implanted.

  Usually, in the case of T-shape, a blade groove having a T-shaped cross section is provided in the circumferential direction of the rotor, and the moving blade is inserted and slid in the circumferential direction of the rotor. The blade groove is provided and the blade is inserted and slid in the axial direction.

JP 2004-225692 A

  By the way, it is important in terms of the strength and performance of the turbine that the turbine blades are straightly planted along a radial line of the rotor (a line passing through the rotor center or a normal line).

  However, conventionally, in order to quantitatively evaluate the life of the turbine blade, a measuring device that measures the length of the turbine blade itself is disclosed in Patent Document 1, but the turbine blade is There was no device to measure whether it was planted straight along the radial line of the rotor.

  Therefore, an object of the present invention is to provide a moving blade implantation measuring tool capable of easily measuring the “falling amount” of a moving blade with a simple configuration.

  In order to achieve such an object, a moving blade implantation measuring tool according to the present invention is a moving blade implantation measuring tool for measuring the falling amount of a moving blade installed in a rotor, and is disposed on the outer peripheral surface of the rotor. A body having two legs, a trunk extending in a direction perpendicular to a line connecting the legs, and a fuselage provided on a base end side of the trunk and contacting the moving blade platform First positioning means for positioning the base end side of the body portion, and second positioning means for positioning the front end side of the body portion by being in contact with the shroud of the moving blade provided on the distal end side of the body portion And a measuring instrument that is provided on the front end side of the body part and measures the rotor circumferential distance with respect to the shroud of the rotor blade.

  The body portion is composed of two parallel rails implanted in the base portion, and at least the second positioning means and the measuring device are movable along the two parallel rails and fixed at an arbitrary position. It is attached to a possible holder.

  The second positioning means is an L-shaped receiving piece that is movably and detachably supported by the holder and contacts two adjacent surfaces of the shroud, and the receiving piece is connected to the back surface of the receiving piece. The dial gage as the measuring instrument is always biased toward the shroud by the spring force of the dial gauge. This second positioning means is preferably used for a serration type moving blade that does not have a shroud surface perpendicular to the rotor outer peripheral direction (parallel to the rotor axial direction).

  The second positioning means is a screw that is screwed into the holder from a side surface of the rotor to adjust a gap between the holder and the shroud. This second positioning means is preferably used for a T-route type moving blade having a shroud surface perpendicular to the rotor outer peripheral direction (parallel to the rotor axial direction). That is, in this case, the L-shaped receiving piece is not used, and the dial gauge tip as a measuring instrument is directly applied to the shroud for measurement.

  The two legs are rolling elements.

  The base portion and the body portion are integrally formed.

  According to the moving blade implantation measuring tool according to the present invention, the two legs of the base are brought into contact with the outer periphery of the rotor, and the first positioning means is used as the moving blade platform and the second positioning means is used as the moving blade shroud. By making each contact, the “falling amount” of the moving blade can be easily measured by the measuring instrument.

  Hereinafter, a moving blade implantation measuring tool according to the present invention will be described in detail with reference to the accompanying drawings.

  1 is a side view of a moving blade implantation measuring tool showing Embodiment 1 of the present invention, FIG. 2 is a front view, FIG. 3 is a plan view, FIG. 4 is a sectional view taken along line AA in FIG. FIG. 6 is an explanatory diagram of the operation of the zero setting gauge.

  As shown in FIGS. 1 and 2, this measuring tool 1 measures the “falling amount” of the serration type moving blade D, and the base 2 and the fuselage 3 have an inverted T shape, Wheels (rolling elements) 4 and 4 as legs are pivotally supported at both front and rear ends of the base 2 formed in a plate shape that is long in the direction (left and right in the drawing). The pair of front and rear wheels 4 and 4 are placed on the outer peripheral surface of the rotor R in the steam turbine or the gas turbine, and can roll along the circumferential direction.

  The body portion 3 is composed of two parallel rails 3a and 3b, and is implanted in the frame-like support portion 5 of the base portion 2 so as to extend in a direction perpendicular (right angle) to a line connecting the wheels 4 and 4. . On these two parallel rails 3a and 3b, an upper holder 6 and a lower holder 7 are supported so that they can be moved up and down (moved) across the two parallel rails 3a and 3b and fixed at an arbitrary position. Has been.

  As shown in FIGS. 3 and 4, the upper holder 6 and the lower holder 7 are each constituted by three sheets of plate-shaped inner holders 6a and 7a, middle holders 6b and 7b, and outer holders 6c and 7c, The inner holders 6a, 7a and the inner holders 6b, 7b are fastened by two bolts 8, 9, and the inner holders 6b, 7b and the outer holders 6c, 7c are fastened by one bolt 10, 11. Yes. Therefore, the upper holder 6 and the lower holder 7 can be raised and lowered by loosening the bolts 10 and 11, and the upper holder 6 and the lower holder 7 can be fixed at arbitrary positions by tightening in reverse.

  When necessary, the upper holder 6 passes through the inner holder 6a, the middle holder 6b, and the outer holder 6c to adjust the gap between the upper holder 6 (the main measurement tool 1) and the shroud S of the rotor blade D. A urethane screw (second positioning means) 12 for this purpose is screwed.

  A side plate 15 is supported on the inner holder 6a of the upper holder 6 through a pair of upper and lower fixing bolts 13 and a long hole 14 so that the position of the side plate 15 can be adjusted in the front-rear direction and is detachable. An L-shaped receiving piece (second positioning means) 16 for positioning the upper holder 6 in contact with two adjacent surfaces including a front surface composed of a slanted surface and a flat side surface is movable and fixed in the front-rear direction. The bolt 17 is supported so as to be fixed at an arbitrary position.

  The receiving piece 16 is always urged toward the shroud S by the spring force of a small dial gauge (measuring instrument) 18 connected to the back surface of the receiving piece 16. The small dial gauge 18 is also supported by a side plate 21 that is detachably attached to the inner holder 6a through a pair of upper and lower fixing bolts 19 and a long hole 20, and is detachably attached to the inner holder 6a. However, it can move together with the receiving piece 16 to measure the rotor circumferential distance with respect to the shroud S and display it numerically on the display unit 18b (see FIG. 3).

  On the other hand, a receiving piece 22 (first positioning means) for positioning the lower holder 7 in contact with the front surface of the inclined surface of the platform P of the moving blade D is attached to and detached from the inner holder 7 a of the lower holder 7 by a bolt 23. It is attached as possible.

  Since the measurement tool 1 is used to measure the “falling amount” of the serration-type moving blade D, first, the upper holder 6 is used with the zero setting gauge 30 shown in FIG. The height of the lower holder 7 and the positioning of the receiving pieces 16 and 22 are set, and the small dial gauge 18 is set to zero.

  The zero setting gauge 30 is a simulation product of a certain kind of so-called serration type rotor blade D (to be measured from now on), and has a shroud shape portion corresponding to the shroud S of the rotor blade D in the height and shape at the upper end thereof. 31 is formed, and a platform shape portion 32 corresponding to the platform P of the moving blade D in height and shape is formed near the lower portion thereof. In addition, it is necessary to manufacture the zero setting gauge 30 each time the specification (shape) of the moving blade D changes. Also, the receiving pieces 16 and 22 need to be prepared in various shapes.

  Therefore, as shown in FIG. 6, first, the bolts 10 and 11 are loosened, and the upper holder 6 and the lower holder 7 are moved up and down along the two parallel rails 3a and 3b, respectively, so that the shroud shape portion 31 and the platform shape portion respectively. After adjusting the height to 32, the bolts 10 and 11 are tightened and fixed. Next, the receiving piece 22 is fixed to the platform shape portion 32 (the front surface formed of the inclined surface) with the bolt 23. At this time, the inner holder 7 a of the lower holder 7 is brought into contact with the side surface of the platform-shaped portion 32. Next, after the receiving piece 16 is applied to two adjacent surfaces of the shroud-shaped portion 31 and the fixing bolt 17 is fastened and fixed, the display portion 18b (scale) of the small dial gauge 18 is set to zero.

  After the initial setting of the measurement tool 1 is performed as described above, the fixing bolt 17 is loosened to make the receiving piece 16 free. That is, it is movable in the front-rear direction.

  Thereafter, as shown in FIGS. 1 to 4, the measurement tool 1 is placed on the outer peripheral surface of the rotor R through the wheels 4 and 4, and the receiving piece 22 and the inner holder 7 a are placed on the platform P of the moving blade D. In addition to positioning by contact, the receiving piece 16 is positioned by contacting the shroud S of the moving blade D.

  If the scale (numerical value) displayed on the display unit 18b of the small dial gauge 18 is read in this state, the “falling amount” with respect to the radial line (line passing through the rotor center or normal) of the moving blade D can be determined. That is, if it is negative, it falls to the near side (forward), if it is positive, it falls to the other side (rear), and if it is zero, it is implanted along the radial line.

  In this way, in this embodiment, the “falling amount” of the moving blade D can be easily measured using the measuring tool 1 having a simple structure. If the measured “falling amount” is within the allowable range, the moving blade D is temporarily fixed, and if not, it is subjected to machining correction.

  In this embodiment, since the receiving piece 16 is used, it is not necessary to use the urethane screw 12 for adjusting the gap between the upper holder 6 and the shroud S. Further, the lower holder 7 may not be raised and lowered but may be fixed. In addition, instead of the two parallel rails 3a and 3b, the upper holder 6 and the like may be supported on a single guide bar so as to be movable up and down. Further, in the present embodiment, when measuring the “falling amount” of the serration type moving blade D, the zero setting gauge 30 is used to adjust the height of the upper holder 6 and the lower holder 7 and the receiving pieces 16 and 22. In addition to positioning, the small dial gauge 18 was set to zero, but if you are familiar with the usage of the measuring tool 1 and can set the set dimensions of the urethane screw 12 without fail, The piece 16 may not be necessary.

  7 is a side view of a moving blade implantation measuring tool showing Embodiment 2 of the present invention, FIG. 8 is a front view, FIG. 9 is a plan view, and FIG. 10 is a sectional view taken along the line CC in FIG.

  As shown in FIGS. 7 and 8, the measurement tool 1 measures the “falling amount” of the T-route type moving blade D, and exhibits a reverse T-shape at the base 2 and the body 3. Wheels (rolling elements) 4 and 4 as legs are pivotally supported at both front and rear ends of the base 2 formed in a plate shape that is long in the front-rear direction (left and right in the drawing).

  The body portion 3 is composed of two parallel rails 3a and 3b, and is implanted in the frame-like support portion 5 of the base portion 2 so as to extend in a direction perpendicular (right angle) to a line connecting the wheels 4 and 4. . On these two parallel rails 3a and 3b, an upper holder 6 and a lower holder 7 are supported so that they can be moved up and down (moved) across the two parallel rails 3a and 3b and fixed at an arbitrary position. Has been.

  As shown in FIGS. 9 and 10, the upper holder 6 and the lower holder 7 are configured by three-layered plate-like inner holders 6 a and 7 a, middle holders 6 b and 7 b, and outer holders 6 c and 7 c, respectively. The inner holders 6a, 7a and the inner holders 6b, 7b are fastened by two bolts 8, 9, and the inner holders 6b, 7b and the outer holders 6c, 7c are fastened by one bolt 10, 11. Yes. Therefore, the upper holder 6 and the lower holder 7 can be raised and lowered by loosening the bolts 10 and 11, and the upper holder 6 and the lower holder 7 can be fixed at arbitrary positions by tightening in reverse.

  The upper holder 6 includes a urethane screw (second positioning means) 12 that passes through the inner holder 6a, the middle holder 6b, and the outer holder 6c and adjusts the gap between the upper holder 6 and the shroud S. Screwed.

  Further, a small dial gauge 18 is attached to the inner holder 6a of the upper holder 6 by a side plate 21 that is detachably attached to the inner holder 6a through a pair of upper and lower fixing bolts 19 and a long hole 20 in the front-rear direction. The gauge portion 18a comes into contact with the flat front surface of the shroud S of the rotor blade D at the time of measurement, and the rotor circumferential direction distance with respect to the shroud S is measured and can be displayed numerically on the display portion 18b. (See FIG. 9).

  On the other hand, on the inner holder 7 a of the lower holder 7, a ball cab screw 50 (first positioning means) that contacts the flat front surface of the platform P of the rotor blade D to position the lower holder 7 is an L-shaped screw seat 51. It is detachably attached by a bolt 52 via A plurality of attachment points (four in the illustrated example) are provided in the front-rear direction.

  Since the measurement tool 1 is used to measure the “falling amount” of the T-route type moving blade D using the present measurement tool 1, as in the first embodiment, the moving blade D to be measured is measured. Initial setting is performed using a non-illustrated zero setting gauge (scoyer) which is a simulated product.

  First, after the fixing bolts 10 and 11 are loosened, the upper holder 6 and the lower holder 7 are moved up and down along the two parallel rails 3a and 3b, and the height is adjusted to the shroud shape portion 31 and the platform shape portion 32, respectively. The bolts 10 and 11 are tightened and fixed. Next, the ball cab screw 50 is fixed at a regular position. Thereafter, the small dial gauge 18 is fixed at a regular position, and its display portion 18b (scale) is set to zero. Finally, the urethane screw 12 is fixed at a normal position so that the measurement tool 1 is vertical.

  After the initial setting of the measurement tool 1 is performed as described above, the measurement tool 1 is placed on the outer peripheral surface of the rotor R via the wheels 4 and 4, and the lower holder is formed by the ball cab screw 50 and the inner holder 7 a. 7 is brought into contact with the platform P of the moving blade D and positioned, and the upper holder 6 is positioned in contact with the shroud S of the moving blade D with the urethane screw 12 and the gauge portion 18a of the small dial gauge 18.

  If the scale (numerical value) displayed on the display unit 18b of the small dial gauge 18 is read in this state, the “falling amount” with respect to the radial line (line passing through the rotor center or normal) of the moving blade D can be determined. That is, if it is negative, it falls to the near side (forward), if it is positive, it falls to the other side (rear), and if it is zero, it is implanted along the radial line.

  In this way, in this embodiment, the “falling amount” of the moving blade D can be easily measured using the measuring tool 1 having a simple structure. In the case of the present embodiment, the “falling amount” is measured on the leading blade D, and if it falls within the allowable range, the subsequent blades D may be inserted into the blade grooves of the rotor R sequentially. The “falling amount” of the leading blade D is measured, and if it is not within the allowable range, the blade D is subjected to machining correction.

  FIG. 11 is a side view of a moving blade implantation measuring tool showing Embodiment 3 of the present invention.

  The present embodiment is an example in which the base 2 and the body portion 3 in the first and second embodiments are integrally formed so that the structure of the measurement tool 1 is further simplified and the operation at the time of measurement is facilitated. . Even in this case, when the size (height) of the moving blade D is uniquely determined, it can be sufficiently measured. In the figure, reference numeral 50A denotes a positioning means corresponding to the ball cab screw 50 of the second embodiment and the receiving piece 22 of the first embodiment.

It is a side view of the moving blade implantation measuring tool which shows Example 1 of this invention. It is a front view. It is a top view. It is the sectional view on the AA line of FIG. It is structure explanatory drawing of a zero setting gauge. It is operation | movement explanatory drawing of a zero setting gauge. It is a side view of the moving blade implantation measuring tool which shows Example 2 of this invention. It is a front view. It is a top view. It is CC sectional view taken on the line of FIG. It is a side view of the moving blade implantation measuring tool which shows Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measurement tool 2 Base part 3 Body part 3a, 3b Parallel rail 4 Wheel 5 Frame-shaped support part 6 Upper holder 7 Lower holder 8,9 Bolt 10,11 Bolt 12 Urethane screw 13 Fixing bolt 14 Long hole 15 Side plate 16 L-shape Receiving piece 17 fixing bolt 18 small dial gauge 19 fixing bolt 20 long hole 21 side plate 22 receiving piece 23 bolt 30 zero setting gauge 31 shroud shape portion 32 platform shape portion 50 ball cab screw 50A positioning means 51 L-shaped screw seat 52 bolt D Rotor P Platform S Shroud R Rotor

Claims (6)

A moving blade implantation measuring tool for measuring the falling amount of a moving blade installed on a rotor,
A base with two legs arranged on the outer peripheral surface of the rotor;
A body part extending in a direction perpendicular to a line connecting the leg parts;
A first positioning means provided on the base end side of the body portion for positioning the base end side of the body portion by contacting a platform of the moving blade;
Second positioning means for positioning the front end side of the body section by being provided on the front end side of the body section and contacting the shroud of the moving blade;
A measuring instrument that is provided on a tip side of the body part and measures a circumferential distance of the rotor with respect to a shroud of the rotor blade;
A moving blade implantation measuring tool characterized by comprising:   The body portion is composed of two parallel rails implanted in the base portion, and at least the second positioning means and the measuring device are movable along the two parallel rails and fixed at an arbitrary position. The moving blade implantation measuring tool according to claim 1, wherein the moving blade implantation measuring tool is attached to a possible holder.   The second positioning means is an L-shaped receiving piece that is movably and detachably supported by the holder and contacts two adjacent surfaces of the shroud, and the receiving piece is connected to the back surface of the receiving piece. 3. The moving blade implantation measuring tool according to claim 2, wherein the measuring device is constantly biased toward the shroud side by a spring force of a dial gauge as the measuring device.   The moving blade implantation measuring tool according to claim 2, wherein the second positioning means is a screw that is screwed into the holder from a side surface side of the rotor to adjust a clearance between the holder and the shroud. .   5. The moving blade implantation measurement tool according to claim 1, wherein the two legs are rolling elements.   The moving blade implantation measuring tool according to claim 1 or 5, wherein the base portion and the body portion are integrally formed.

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