JP4486532B2 - Stator blade insertion and extraction device, blade ring assembly method and stator blade extraction method - Google Patents

Description

  The present invention relates to a stationary blade attaching / detaching device used when a stationary blade is pulled out from a blade ring or incorporated into a blade ring in an axial flow turbine such as a gas turbine.

In a turbine portion of a gas turbine, since a stationary blade is used in a severe environment of high temperature and high pressure, metal fatigue or corrosion is likely to occur, and it is necessary to periodically inspect and perform maintenance. Conventionally, the insertion and removal of the stationary blades has been performed manually by a worker with a wooden hand in one hand, which required a great deal of labor and time.
On the other hand, the present applicant has proposed a stationary blade attaching / detaching device according to Japanese Patent Laid-Open No. 2002-371805 for the purpose of reducing and shortening a great amount of labor and time by manual work. 6 (a) and 6 (b) show an outline of the stationary blade attaching / detaching device.

This stationary blade attaching / detaching device is generally composed of a device main body 2 provided with a manual winder 06 and a claw portion 04 connected to the winder 06 via a wire 05.
Usually, the stationary blade 022 of the gas turbine is inserted and arranged on the inner peripheral side of the blade ring 020 along the rail-shaped heat shield ring (stator blade engaging portion) 021, and then on the inner surface of the turbine casing (casing). It is fixed. On the other hand, this attachment / detachment device fixes the device main body 02 to the outer periphery and the side surface of the blade ring 020 and hooks the claw portion 04 onto the stationary blade block 022 composed of a plurality of stationary blades. A mechanism for drawing the stationary blade block 022 toward the apparatus main body 02 is adopted.

The apparatus main body 02 is disposed on the outer surface of the blade ring 020, a holding plate 07 disposed on the side surface (upper surface in the drawing) of the blade ring 020, a plate-like spacer 08 fixed below the holding plate 07. A fixed plate 09 and a pin 010 provided in a lower portion of the fixed plate 09 and inserted into a plurality of radial holes 024 provided at intervals in the outer circumferential direction of the blade ring 020. Has been.

  The holding plate 07 of the apparatus main body 02 is fixed to the fixed plate 09 by bolts 011. The spacer 08 is formed such that the circumferential dimension of the blade ring 020 is longer than the width dimension of the pressing plate 07 and is fixed to the pressing plate 07 with bolts 012. The pin 010 is screwed into the fixing plate 09 and is detachably fixed.

  Next, the claw portion 04 is inserted into the gap between the stationary blade block 022 and the heat shield ring 021, and the claw portion 04 is hung on the stationary blade block 022. Then, with the winder 06 attached to the apparatus main body 02, the wire 05 connected to the claw portion 04 and the apparatus main body 02 is taken up and squeezed toward the apparatus main body 02. Then, the stationary blade block 022 is moved by the tension of the wire 05 and is drawn to the apparatus main body 02.

After sufficiently pulling the stationary blade block 022 toward the apparatus main body 02, the apparatus main body 02 is detached from the blade ring 020, and a pin 010 is inserted into another hole 024 to fix the apparatus main body 02 to the blade ring 020 again. Then, the claw portion 04 is hung on the stationary blade block 022, the wire 05 is wound up by the winder 06, and the stationary blade block 022 is moved in the circumferential direction of the blade ring 020.
Thereafter, the same operation is repeated, and the stationary blade block 022 is moved in the circumferential direction of the blade ring 020 to be attached to and detached from the blade ring 020 at a predetermined position.
JP 2002-371805 A

In recent gas turbines, machining accuracy has been improved in response to a request to improve turbine efficiency by reducing leakage of turbine working fluid as much as possible. As a result, the blade ring 020 (heat shield ring 021) has a stationary blade block 022. There is very little clearance (play) when the is inserted. If the play at the time of insertion is reduced, it is difficult to insert the stationary blade block with a biased force or a weak force with respect to the blade ring 020. For example, an operator manually inserts it into one hand of a mallet. Needed a lot of time and effort.

On the other hand, the stationary blade attaching / detaching device described in Japanese Patent Application Laid-Open No. 2002-371805 can be relatively easily inserted by the strong force of the winder 06. However, as shown in FIG. 6, the portion where force is applied to the stationary blade block 022 is only one point at the upper end of the stationary blade block 022 (when the blade is laid down sideways). In addition, since a large force of the winder 06 is concentrated through the wire 05, an upward twist is generated in the horizontal direction in which the stationary blade block 022 is inserted, and the insertion and extraction operations may not be performed smoothly. . This phenomenon is particularly prominent when the stationary blade block 022 itself is distorted to the extent that it does not cause structural problems.

  The present invention aims to eliminate such problems, and provides a stationary blade attaching / detaching device that can easily insert and withdraw the stationary blade block 022 without causing twisting. .

(1) In an apparatus for inserting or withdrawing a stationary blade in a circumferential direction of a blade ring in a stationary blade engaging portion of a blade ring of a divided turbine, the upper surface extends from the divided end portion of the blade ring. Guide rail fixed to the blade ring so as to form the same plane as the side surface of the blade ring, a support bracket that can be fixed to the side surface of the blade ring or the upper surface of the guide rail, and the guide rail A movable bracket that slides in the direction in which the stationary blade is inserted or withdrawn while making surface contact with the upper surface or the side surface of the blade ring, and one end connected to the support bracket and the other end connected to the movable bracket A stationary blade insertion and extraction device comprising an arm expansion and contraction device.

 In the present invention, the support bracket is fixed to the side surface of the blade ring of the turbine or the upper surface of the guide rail extending from the blade ring. Then, using the support bracket as a base point, the movable bracket slides and moves the blade ring or the guide rail in surface contact with the telescopic arm of the arm telescopic device. As the movable bracket moves, the stationary blade held by the movable bracket is inserted into or extracted from the stationary blade engaging portion of the blade ring.

(2) The stationary blade insertion / extraction device according to (1) above, wherein the support bracket can be fixed at a desired position on the side surface of the blade ring or the upper surface of the guide rail.

In this invention, the support bracket is fixed at a desired position on the side surface of the blade ring or the upper surface of the guide rail, and the arm extender is operated with the position as a base point to move the movable bracket.

(3) The support bracket and the movable bracket are provided with a joint portion at the same height from the side surface of the blade ring or the upper surface of the guide rail, and the support bracket and the movable bracket are connected to the arm expansion / contraction device via the joint portion. The stationary blade insertion / extraction device according to (1), which is characterized in that

In the present invention, the force vector acting by the expansion and contraction of the arm expansion / contraction device is smoothly converted to the direction in which the support bracket and the movable bracket relatively move via the joint portion, and is transmitted to both brackets. In addition, since the joint portions of both brackets are provided at equal heights, the force of the arm telescopic device acts only in the horizontal direction.

(4) In an apparatus for inserting or extracting a stationary blade in a circumferential direction of a blade ring in a stationary blade engaging portion of a turbine blade ring, the inner circumference of the blade ring is appropriately provided in a hole provided in the circumferential direction of the blade ring. A support pin that can be inserted and fixed from the side, a pressing block that holds the stationary blade and can move in the direction in which the stationary blade is inserted or withdrawn from the blade ring, and one end that is connected to the supporting pin and the other end is a pressing block And a portion where the arm expansion device and the support pin are connected and a portion where the arm expansion device and the pressing block are connected are located on the inner peripheral side of the wing ring. The stationary blade insertion and extraction device.

In the present invention, the stationary blade held by the pressing block moves along the circumferential direction of the blade ring with the support pin fixed to the hole provided in the circumferential direction of the blade ring as a base point. This movement of the pressing block is achieved by being pushed or pulled by the telescopic arm of the arm telescopic device.

(5) In a method of assembling a blade ring into which a stationary blade is inserted by the stationary blade insertion / extraction device according to any one of (1) to (3) , the side surface of the blade ring and the upper surface of the guide rail are flush with each other. The guide rail is extended and fixed to the end of the divided blade ring so as to form, and the movable bracket is disposed on the guide rail so that the stationary blade is gripped by the movable bracket, and the movable bracket The support bracket is attached and fixed to the guide rail in a state where the arm of the arm expansion / contraction device is contracted with respect to the arrangement position, and then the stationary blade held by the movable bracket is extended by extending the arm expansion / contraction device. A method for assembling a blade ring, wherein the blade ring is pushed out and inserted into a blade engaging portion.

 In the present invention, the movable bracket is pushed and moved along the guide rail or the blade ring by the arm extension of the arm expansion / contraction device with the support bracket fixed to the guide rail as a base point. Along with the movement of the movable bracket, the stationary blade held by the movable bracket is inserted into the stationary blade engaging portion of the blade ring.

(6) In the method of assembling a blade ring into which a stationary blade is inserted by the stationary blade insertion / extraction device according to any one of (1) to (3) , the side surface of the blade ring and the upper surface of the guide rail are flush with each other. The guide rail is extended and fixed to the end of the divided blade ring so as to form, and the movable bracket is disposed on the guide rail so that the stationary blade is gripped by the movable bracket, and the movable bracket The support bracket is attached and fixed to the blade ring with the arm of the arm telescopic device extended to the position where the arm is extended, and then the stationary blade held by the movable bracket is retracted by retracting the arm telescopic device. A method of assembling a wing ring, wherein the wing ring is pulled into and inserted into a wing engaging portion.

 In the present invention, the movable bracket is pulled and moved along the guide rail or the blade ring by reducing the arm of the arm expansion / contraction device with the support bracket fixed to the blade ring as a base point. Along with the movement of the movable bracket, the stationary blade held by the movable bracket is inserted into the stationary blade engaging portion of the blade ring.

(7) In the method of assembling the blade ring into which the stationary blade is inserted by the stationary blade insertion / extraction device described in (4 ) above, the stationary blade is gripped by the pressing block, and the arm extends and contracts with respect to the arrangement position of the pressing block. With the arm of the device contracted, the support pin is attached and fixed in a hole provided in the circumferential direction of the blade ring as appropriate, and then the stationary blade held by the pressing block is extended by extending the arm telescopic device. A method for assembling a blade ring, wherein the blade ring is extruded and inserted into a stationary blade engaging portion.

 In the present invention, the pressing block is pushed out and moved along the blade ring by the arm extension of the arm extender with the support pin fixed in the hole of the blade ring as a base point. With the movement of the pressing block, the stationary blade held by the pressing block is inserted into the stationary blade engaging portion of the blade ring.

(8) In the method of assembling the blade ring into which the stationary blade is inserted by the stationary blade insertion / extraction device described in (4 ) above, the stationary blade is gripped by the pressing block, and the arm extends and contracts with respect to the arrangement position of the pressing block. With the arm of the device extended, attach the support pin to the appropriate hole in the circumferential direction of the blade ring and fix it, and then retract the stationary blade held by the pressing block by contracting the arm expansion and contraction device. A method of assembling a blade ring, wherein the blade ring is pulled into and inserted into a stationary blade engaging portion.

 In this invention, the pressing block is pulled and moved along the guide rail or the blade ring by reducing the arm of the arm expansion / contraction device with the support pin fixed in the hole of the blade ring as a base point. With the movement of the pressing block, the stationary blade held by the pressing block is inserted into the stationary blade engaging portion of the blade ring.

(9) In a method of pulling out a stationary blade from a blade ring by the stationary blade insertion pulling device according to any one of (1) to (3) ,
Attach the movable bracket to the blade ring so that the movable bracket grips the stationary blade arranged in the stationary blade engaging part of the blade ring,
Attach the support bracket to the wing ring and fix it with the arm of the arm telescopic device contracted relative to the position of the movable bracket,
Thereafter, the stationary blade extraction method is characterized in that the stationary blade held by the movable bracket is pushed out and pulled out from the stationary blade engaging portion of the blade ring by extending the arm telescopic device.

 In this invention, the movable bracket is pushed out and moved along the blade ring by the arm extension of the arm extender with the support bracket fixed to the blade ring as a base point. As the movable bracket moves, the stationary blade held by the movable bracket is pulled out from the stationary blade engaging portion of the blade ring.

(10) A stator blade disposed at a stator blade engaging portion of the blade ring in a method of extracting the stator blade from the blade ring by the stator blade insertion pulling device according to any one of (1) to (3 ) above Attach the movable bracket to the wing ring so that the movable bracket grips it, attach the support bracket to the wing ring with the arm expansion arm extended to the position of the movable bracket, and then fix the arm expansion device. A stator blade extraction method comprising retracting and extracting a stationary blade held by a movable bracket into a stationary blade engaging portion of a blade ring by contraction.

In the present invention, the movable bracket is pulled and moved along the blade ring by reducing the arm of the arm expansion / contraction device with the support bracket fixed to the blade ring as a base point. As the movable bracket moves, the stationary blade held by the movable bracket is pulled out from the stationary blade engaging portion of the blade ring.
In this application, an arm extender is a device represented by a hydraulic cylinder, an air cylinder, a piston device, etc., which can be extended to other objects by extending and retracting an arm-like element of the device in a predetermined direction. A thing that exerts an action of pushing or pulling.

According to the invention of (1) , since the movable bracket is configured to slide while being in surface contact with the upper surface of the guide rail or the side surface of the blade ring, even if the force of the vertical component by the arm extender is applied, There is almost no torsion in the vertical direction. For this reason, the stationary blade held by the movable bracket can be smoothly inserted and removed without causing interference with the stationary blade engaging portion of the blade ring. Also, if the movable bracket is moved onto the upper surface of the guide rail extending from the blade ring and the stator blade is attached (gripped) or removed (released) from the movable bracket, it will interfere with the blade ring. It is possible to attach and remove the stationary blade to the movable bracket without matching.

According to the invention of (2) , the support bracket can be mounted and fixed on the side surface of the blade ring or the upper surface of the guide rail over a plurality of times in correspondence with the moving position of the movable bracket. Therefore, even if the arm length of the arm telescopic device is short, the movable bracket can be moved to a desired position.

According to the invention of (3) , the force of the arm telescopic device can be transmitted sufficiently and smoothly to the movable bracket 3, so that the stationary blade held by the movable bracket can be smoothly transferred to the stationary blade engaging portion of the blade ring. Can be inserted or removed. Further, since the force of the arm telescopic device acts almost only in the horizontal direction, the movable bracket hardly generates vertical torsion or the like.

According to the invention of (4) , even when a projection or the like is provided on the side surface of the blade ring, the stationary blade can be inserted into the blade ring without causing the support pin or the pressing block to interfere with the projection or the like. The drawing operation can be performed.

According to the inventions of (5) to (8) , the stationary blade can be easily inserted into the stationary blade engaging portion of the blade ring in a short time.
According to the inventions of (9) and (10) , the stationary blade can be easily pulled out from the stationary blade engaging portion of the blade ring in a short time.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
1 to 4 show a stationary blade attaching / detaching apparatus according to Embodiment 1 of the present invention. 1 is a perspective view of the stationary blade attaching / detaching device, FIG. 2 is a top view of the blade ring and the stationary blade attaching / detaching device, FIG. 3 is a side view of the stationary blade attaching / detaching device, and FIG. 4 is a perspective view of the movable bracket. In the following description, “the present device” refers to the stationary blade attaching / detaching device.
In these drawings, a plate-shaped guide rail 1 formed to have substantially the same curvature as the curvature of the blade ring 20 is attached to the end (joint surface) 20b of the semicircular blade ring 20. The guide rail 1 is a base member that is horizontally disposed so as to form the same surface as the side surface 20a of the blade ring 20 when the blade ring 20 is laid down. A joint plate 1a is provided at the end of the guide rail 1, and the joint plate 1a is fixed to the end (joint surface) 20b of the blade ring 20 with a bolt. A large number of through holes 1b with a predetermined interval are provided on the upper surface 1c of the guide rail 1, and the other end of the guide rail 1 is supported by the support legs 5 so as to keep the horizontal direction.

A support bracket 2 including a base portion 2a, a joint portion 2b, and a lateral fixing plate 2c is disposed on the upper portion of the side surface 20a of the guide rail 1 or the blade ring 20. Here, the base portion 2a is slightly curved in a fan shape when seen from above so as to fit over the guide rail 1 or the side surface 20a of the blade ring 20 and on both sides thereof, and straddles the guide rail 1. It is a member whose cross section has a “U” shape. And the through-hole 2d corresponding to the through-hole 1b of the guide rail 1 is provided in the said base part 2a. The joint portion 2b is a joint that can allow horizontal movement, and the support bracket 2 is connected to an end portion of the hydraulic cylinder (arm extender) 4 through the joint portion 2b. The lateral fixing plate 2c has through holes 2e corresponding to a plurality of holes 24 provided at intervals in the outer circumferential direction of the blade ring 20.
When the support bracket 2 is arranged on the guide rail 1 in such a configuration, the through hole 2d of the base portion 2a is arranged at a desired position where it matches the through hole 1b of the guide rail 1, and the fixing pin 7a is inserted. To do. By fixing the fixing pin 7a and the base portion 2a to the guide rail 1, horizontal movement and blurring of the support bracket 2 are prevented. Further, when the support bracket 2 is disposed on the side surface 20a of the blade ring 20, the side surface 20a of the blade ring 20 does not have a through hole (corresponding to 1b) like the guide rail 1 but on the outer peripheral side of the blade ring 20. Since the plurality of holes 24 are provided, the fixing pin 7b is inserted with the through hole 2e of the lateral fixing plate 2c aligned with the hole 24 of the blade ring 20. By fixing the fixing pin 7b and the base portion 2a to the blade ring 20, the horizontal movement and blurring of the support bracket 2 are prevented.

A movable bracket 3 is connected to the other end of the hydraulic cylinder 4. The movable bracket 3 includes a base portion 3a that can slide along the upper surface 1c of the guide rail 1 and the side surface 20a of the blade ring 20, and a joint portion 3b that connects the hydraulic cylinder 4 to the upper portion. It has.
When viewed from above, the base portion 3a has a shape that is slightly fan-shaped along the upper surface 1c of the guide rail 1 or the side surface 20a of the blade ring 20, and covers the entire outer shroud 22a portion of the stationary blade block 22. Widely formed. In addition, the cross-section of the base portion 3a is substantially L-shaped so as to contact the outer peripheral side surface 1d of the guide rail 1 or the outer peripheral surface 20d of the blade ring 20. In a range covering the outer shroud 22 a in the base portion 3 a (hereinafter, this range is referred to as “projection portion 3 a ′”), the insertion pin 10 is provided when the movable bracket 3 is connected and fixed to the stationary blade block 22. A through hole 3d for insertion is provided. The opening position of the through hole 3d is provided at a position where when the insertion pin 10 is inserted, the pin 10 is just in contact with the inner peripheral surface of the blade ring 20 or the side surface 1d of the guide rail 1. Combined with the saddle-shaped portion having the “L” cross section, the base portion 3a is useful for preventing blurring to the left and right (directions other than the original sliding direction).

The joint portion 3b is a joint that can allow horizontal movement, similar to the joint portion 2b of the support bracket 2, and is provided at substantially the same height as the joint portion 2b of the support bracket 2.

The procedure for removing the stationary blade block 22 from the blade ring 20 with this apparatus is as follows.
The joint plate 1a of the guide rail 1 is bolted to the end portion (joint surface) 20b of the blade ring 20 with the semicircular blade ring 20 laid down, and the upper surface 1c of the guide rail 1 is the side surface 20a of the blade ring 20. The guide rails 1 are arranged so as to constitute the same plane. Usually, since the side surface 20a when the wing ring 20 is laid down is horizontal, the upper surface 1c of the guide rail 1 is disposed horizontally so as to maintain the same height as the side surface 20a.
Next, while sliding the movable bracket 3 on the side surface 20a of the blade ring 20, the movable bracket 3 is engaged with the outer shroud 22a on the stationary blade block 22 located closest to the guide rail 1 of the blade ring 20. . In this state, the insertion pin 10 is inserted into the stress relaxation groove 22b of the outer shroud 22a from the through hole 3d provided in the base portion 3a of the movable bracket 3, and the movable bracket 3 and the stationary blade block 22 are fixed.
Next, the position of the support bracket 2 in a state where the hydraulic cylinder 4 is almost extended is selected on the guide rail 1 with the installation position of the movable bracket 3 as a reference. The hole of the base portion 2a of the support bracket 2 is aligned with the through hole 1b in the vicinity of the position on the guide rail 1 while finely adjusting the expansion and contraction of the hydraulic cylinder 4, and the fixing pin 7a is inserted to support the guide bracket 2 and the guide. The rail 1 is fixed.

In the above state, when the hydraulic cylinder 4 is operated and the cylinder is contracted, the movable bracket 3 is pulled on the side surface 20 a of the blade ring 20 or the upper surface 1 c of the guide rail 1 by being pulled by the support bracket 2 fixed to the guide rail 1. Slide horizontally along their length. Since the stationary blade block 22 is attached to the movable bracket 3, the stationary blade block 22 also slides with respect to the blade ring 20 by the stroke of the hydraulic cylinder 4.
When the hydraulic cylinder 4 is almost contracted, the fixing pin 7a is removed, the fixed state of the support bracket 2 with respect to the guide rail 1 is released, and the hydraulic cylinder 4 is returned to the fully extended state again. Similarly to the above procedure, the position of the support bracket 2 is selected based on the current position of the movable bracket 3 and the length of the hydraulic cylinder 4 that is substantially extended, and the support bracket 2 is fixed to the guide rail 1.
Thereafter, the operation of the hydraulic cylinder 4 and the attachment and removal of the support bracket 2 are repeated until the stationary blade block 22 is completely removed from the blade ring 20. When the stationary blade block 22 is removed from the blade ring 20, the difference inserted between the stress relaxation groove 22 b and the hole 3 d of the movable bracket 3 while the stationary blade block 22 is suspended and held by a hoist (simple crane) (not shown) or the like. The insert pin 10 is extracted, and the stationary blade block 22 and the movable bracket 3 are fixed. Thereafter, the stationary blade block 22 is placed on a cart (not shown).

It can also be removed by the following procedure.
The procedure from the installation of the guide rail 1 to the blade ring 20, the placement of the movable bracket 3, and the fixing of the movable bracket 3 and the stationary blade block 22 are performed in the same manner as described above.
Next, the position of the support bracket 2 with respect to the state in which the hydraulic cylinder 4 is almost contracted is selected on the side surface 20a of the blade ring 20 with the installation position of the movable bracket 3 as a reference. Then, the through hole 2e of the lateral fixing plate 2c of the support bracket 2 is aligned with the hole 24 near the selected position while finely adjusting the expansion and contraction of the hydraulic cylinder 4, and the fixing pin 7b is inserted to attach the support bracket 2 to the blade ring 20. Secure to.

In such a state, when the hydraulic cylinder 4 is operated and the cylinder is extended, the movable bracket 3 is pushed by the support bracket 2 fixed to the side surface 20a of the blade ring 20 to move the movable bracket 3 to the side surface 20a of the blade ring 20 or the guide rail 1. Slide horizontally on the upper surface 1c along their longitudinal direction. Since the stationary blade block 22 is attached to the movable bracket 3, the stationary blade block 22 also slides with respect to the blade ring 20 by the stroke of the hydraulic cylinder 4.
When the hydraulic cylinder 4 is almost extended, the fixing pin 7b is removed to release the fixed state of the support bracket 2 with respect to the blade ring 20, and the hydraulic cylinder 4 is returned to a substantially contracted state. Then, similarly to the above procedure, the position of the support bracket 2 is selected based on the current position of the movable bracket 3 and the length of the hydraulic cylinder 4 that is substantially contracted, and the support bracket 2 is fixed to the blade ring 20.
Thereafter, the operation of the hydraulic cylinder 4 and the attachment and removal of the support bracket 2 are repeated until the stationary blade block 22 is completely removed from the blade ring 20. When the stationary blade block 22 is removed from the blade ring 20, the difference inserted between the stress relaxation groove 22 b and the hole 3 d of the movable bracket 3 while the stationary blade block 22 is suspended and held by a hoist (simple crane) (not shown) or the like. The insert pin 10 is extracted, and the stationary blade block 22 and the movable bracket 3 are fixed. Thereafter, the stationary blade block 22 is placed on a cart (not shown).

The procedure for inserting the stationary blade block 22 into the blade ring 20 by this apparatus is as follows.
The joint plate 1a of the guide rail 1 is bolted to the end portion (joint surface) 20b of the blade ring 20, and the guide rail 1 is disposed horizontally such that the upper surface 1c of the guide rail 1 forms the same surface as the side surface 20a of the blade ring 20. Is the same as the procedure for removing the blade ring 20. Next, the movable bracket 3 is installed on the guide rail 1. The installation position of the movable bracket 3 is preferably such that the stationary blade block 22 attached to the movable bracket 3 is positioned slightly in front of the insertion opening of the blade ring 20. Then, the stationary blade block 22 is lifted by a hoist or the like (not shown), is made to face the blade ring 20, and is inserted slightly. In this state, the insertion pin 10 is inserted into the stress relaxation groove 22b of the outer shroud 22a from the through hole 3d provided in the base portion 3a of the movable bracket 3, and the movable bracket 3 and the stationary blade block 22 are fixed.

Next, the support bracket 2 is attached to the guide rail 1. At this time, the positioning of the movable bracket 3 as a reference is the same as the procedure for removing the stationary blade block 22. However, when the stationary blade block 22 is inserted, the hydraulic cylinder 4 is substantially contracted. This point is the mounting position of the support bracket 2. Thereafter, the hole of the base portion 2a of the support bracket is aligned with the through hole 1b near the point on the guide rail 1 while finely adjusting the expansion and contraction of the hydraulic cylinder 4, and the fixing pin 7a is inserted to fix both.

When the hydraulic cylinder 4 is operated and the cylinder is extended in this state, the movable bracket 3 slides horizontally on the upper surface 1c of the guide rail 1 in the direction of the blade ring 20 with respect to the support bracket 2 in the fixed state. Since the stationary blade block 22 is attached to the movable bracket 3, the stationary blade block 22 is also slid and inserted into the blade ring 20 by the stroke of the hydraulic cylinder 4.
When the hydraulic cylinder 4 is almost extended, the fixing pin 7a is removed, the fixed state of the support bracket 2 with respect to the guide rail 1 is released, and the hydraulic cylinder 4 is returned to the contracted state. Similarly to the above procedure, the position of the support bracket 2 corresponding to the state in which the hydraulic cylinder 4 is substantially contracted is selected on the basis of the current position of the movable bracket 3. And the hole of the base part 2a of the support bracket 2 is made to correspond to the through-hole 1b of the said point vicinity on the guide rail 1, and both are fixed by inserting the fixing pin 7a.
Thereafter, the stationary blade block 22 is inserted into a desired position of the blade ring 20 by repeatedly driving the hydraulic cylinder 4 and attaching and detaching the support bracket 2.

It is also possible to insert in the following procedure.
The procedure from the installation of the guide rail 1 to the blade ring 20, the placement of the movable bracket 3, and the fixing of the movable bracket 3 and the stationary blade block 22 are performed in the same manner as described above.
Next, the support bracket 2 is attached to the blade ring 20. The support bracket 2 is positioned by selecting a point where the hydraulic cylinder 4 is substantially extended with reference to the installation position of the movable bracket 3. Then, the through-hole 2e of the lateral fixing plate 2c of the support bracket 2 is made to coincide with the hole 24 of the blade ring 20 located in the vicinity thereof while finely adjusting the expansion and contraction of the hydraulic cylinder 4, and fixed by the fixing pin 7b.

When the hydraulic cylinder 4 is operated and the cylinder is contracted in this state, the movable bracket 3 slides horizontally on the upper surface 1c of the guide plate 1 toward the blade ring 20 by being pulled by the support bracket 2 in a fixed state. Since the stationary blade block 22 is attached to the movable bracket 3, the stationary blade block 22 is also slid and inserted into the blade ring 20 by the stroke of the hydraulic cylinder 4.
When the hydraulic cylinder 4 is almost contracted, the fixing pin 7b is removed, the fixed state of the support bracket 2 with respect to the blade ring 20 is released, and the hydraulic cylinder 4 is returned to the extended state. Similarly to the above procedure, the position of the support bracket 2 corresponding to the state in which the hydraulic cylinder 4 is substantially extended is selected with reference to the current position of the movable bracket 3. And the hole of the base part 2a of the support bracket 2 is made to correspond to the hole 24 near the said point of the blade ring 20, and both are fixed by inserting the fixing pin 7b.
Thereafter, the stationary blade block 22 is inserted into a desired position of the blade ring 20 by repeatedly driving the hydraulic cylinder 4 and attaching and detaching the support bracket 2.

The operation and effects of this device are as follows.
In this apparatus, the movable bracket 3 does not move on a straight line but moves in an arc shape. Therefore, as the stroke length of the hydraulic cylinder 4 becomes longer, the direction of the force received by the support bracket 2 and the movable bracket 3 from the hydraulic cylinder 4 deviates from the direction in which the movable bracket 3 moves, and the vector acting in the moving direction. The amount is reduced and inefficient. On the other hand, in the hydraulic cylinder 4 with a short stroke length, it is difficult to insert the stationary blade block 22 into a predetermined position on the blade ring 20 at a time. Therefore, in this apparatus, the support bracket 2 is configured to be attached or detached at a desired position on the guide rail 1 or the blade ring 20 and combined with the hydraulic cylinder 4 having a short stroke length, thereby inserting and extracting the stationary blade block 22. Can be performed several times little by little.

Since the support bracket 2 and the movable bracket 3 are connected to the hydraulic cylinder 4 via joint portions 2b and 3b, respectively, a force vector that the hydraulic cylinder 4 acts in a linear direction by its expansion and contraction is expressed as a joint portion. 2b and 3b are smoothly converted and transmitted in the direction along the curve formed by the outer periphery of the blade ring 20, and the force of the hydraulic cylinder 4 is sufficiently transmitted to the movable bracket 3.

 The base portion 3a of the movable bracket 3 is always kept in horizontal contact with the upper surface 1c of the guide rail 1 and the side surface 20a of the blade ring 20 even during sliding movement. Further, the joint portion 3b of the movable bracket 3 maintains substantially the same height as the joint portion 2b of the support bracket 2 even during the sliding movement of the movable bracket 3. For this reason, the force of the hydraulic cylinder 4 acts on the movable bracket 3 almost only in the horizontal direction, and the force of the vertical component, particularly the force to lift the movable bracket 3 hardly acts. Accordingly, the movable bracket 3 is hardly twisted in the vertical direction, and the stationary blade block 22 held by the movable bracket 3 does not interfere with the inner surface of the stationary blade engaging portion 21 of the blade ring 20 and is smooth. Can be inserted and removed.

 The guide rail 1 has substantially the same curvature as the side surface 20 a of the blade ring 20. For this reason, the support bracket 2 and the movable bracket 3 are firmly attached to the upper surface 1c and the side surface 1d of the guide rail 1 in the same manner as when the support bracket 2 and the movable bracket 3 are positioned on the side surface 20a of the blade ring 20. This is useful for preventing turning up and shifting when the hydraulic cylinder 4 is in contact.

 In the present embodiment, the hydraulic cylinder 4 is exemplified as a general cylinder that expands and contracts linearly, but a cylinder that extends and contracts along the curvature of the blade ring 20 may be used. If such a hydraulic cylinder 4 is used, a constant force always acts on the movable bracket 3 in the direction in which the bracket 3 slides, so that the stationary blade engaging portion of the blade ring 20 can be moved more smoothly. 21 can be inserted. Further, in this case, since force is always applied to the support bracket 2 and the movable bracket 3 from a fixed direction, it is not necessary to use the joint portions 2b and 3b, and the apparatus configuration can be simplified.

Next, a second embodiment of the present invention will be described.
Normally, various protrusions are often provided on the outer peripheral surface 20d of the blade ring 20. For example, a suspension piece 70 (a member for lifting with a crane or the like when the blade ring 20 is mounted on the turbine casing) as shown in FIG. When such a protrusion is provided in the vicinity of the side surface 20a of the blade ring 20, in the above-described support bracket 2 having a “U” cross section and movable bracket 3 having a “L” cross section, The letter-shaped or “L” -shaped saddle-shaped portion interferes with the projections and interferes with the installation of the support bracket 2 on the side surface 20 a and the sliding movement of the movable bracket 3. Therefore, when inserting or pulling out the stationary blade block 22 through the portion where these protrusions are arranged, the support pin 60 and the pressing block 50 shown in FIG. 5 are used instead of the support bracket 2 and the movable bracket 3. Then, the stationary blade block 22 is inserted or pulled out.

The structure of the support pin 60 and the pressing block 50 is as follows.
The hole 24 of the blade ring 20 is opened through from the outer peripheral surface 20d of the blade ring 20 to the inner peripheral surface. However, as shown in FIG. 20 is a member inserted and fixed from the inner peripheral side of 20. The support pin 60 is composed of a head portion and a body portion, and the body portion is formed in a cylindrical shape so as to fit into the inner diameter of the hole 24 of the wing ring 20, and the head portion is a hole of the wing ring 20. 24 is formed in a quadrangular prism shape having a cross section that is large enough not to be fitted. The head of the support pin 60 includes a joint portion 60a that is connected to the end of the hydraulic cylinder 4 and allows the hydraulic cylinder 4 to move in the horizontal direction. The connection between the joint 60 a and the end of the hydraulic cylinder 4 is configured by inserting a pin 61.

The pressing block 50 is configured to cover and grip a part of the outer shroud 22a portion of the stationary blade block 22, and as shown in FIG. 5, the inclined surface of the stationary blade block 22 and the horizontal surface of the outer shroud 22a. It has a structure that comes into contact with a part. A through hole 50b for inserting the fixing pin 52 from above is provided in the stress relaxation groove 22b of the outer shroud 22a at the tip of the portion that contacts the horizontal plane, and the pressing block 50 is inserted by the insertion of the fixing pin 52. The outer shroud 22a of the stationary blade block 22 is fixed. A joint portion 50 a is provided on the end face of the pressing block 50. The joint portion 50 a is positioned at the same height as the joint portion 60 a of the support pin 60 when the support pin 60 is mounted in the hole 24 of the blade ring 20 and the pressing block 50 is fixed to the stationary blade block 22. (That is, the line connecting the joint portions 60a and 50a is parallel to the side surface 20a of the blade ring 20), and is installed at a position below the pressing block 50 and on the inner peripheral side of the blade ring 20. And it is comprised by the joint which connects with the other edge part of the hydraulic cylinder 4 with the pin 51, and permits the movement of the hydraulic cylinder 4 to the horizontal direction.
In the first embodiment, the hydraulic cylinder 4 is located above the side surface 20a in the state where the blade ring 20 is laid down. However, in the present embodiment, the hydraulic cylinder 4 is The blade ring 20 is located on the inner peripheral side.

The method of inserting the stator blade block 22 into the blade ring 20 or pulling it out from the blade ring 20 using the pressing block 50, the support pin 60 and the hydraulic cylinder 4 having such a configuration is substantially the same as the case of the first embodiment. It is the same. That is, by extending or reducing the length of the hydraulic cylinder 4 by using the support pin 60 as a base point, the pressing block 50 and the stationary blade block 22 are slid into the blade ring 20 or pulled out from the blade ring 20, and then the hydraulic cylinder 4. The operation of returning to the original length and positioning the support pin 60 with respect to the hole 24 is repeated as necessary.

By adopting such a configuration, the stationary blade block 22 is inserted into the blade ring 20 or pulled out from the blade ring 20 without interfering with various protrusions on the outer peripheral surface 20d of the blade ring 20. Can do. Further, the pressing block 50 is configured to cover the two surfaces of the outer shroud 22a of the stationary blade block 22, and is configured to be inserted into the through hole 50b and fixed to the stress relaxation groove 22b of the stationary blade block 22. Further, the stationary blade block 22 and the pressing block 50 do not drop out, and the force of the hydraulic cylinder 4 can be transmitted to the stationary blade block 22 more reliably. Also, the height positions of the joint portion 60a and the joint portion 50a are substantially the same (the line connecting the joint portions is parallel to the side surface 20a of the blade ring 20), and both the joint portions 60a and 50a are in the horizontal direction of the hydraulic cylinder 4. Therefore, the force of the hydraulic cylinder 4 can be transmitted without being shaken in the vertical direction or the like.
As in the first embodiment, in the second embodiment, the stationary blade block 22 (pressing block 50) is attached to the blade ring 20 in the direction in which the arm of the hydraulic cylinder 4 is extended and pushed out from the support pin 60. Not only the case of insertion, but also the case where the arm of the hydraulic cylinder 4 is reduced and the stationary blade block 22 is pulled and inserted in the direction of the support pin 60 can be employed. Similarly, not only the arm of the hydraulic cylinder 4 is reduced and the stationary blade block 22 (pressing block 50) is pulled in the direction of the support pin 60 and pulled out from the blade ring 20, but the arm of the hydraulic cylinder 4 is extended. It is also possible to employ the case where the stationary blade block 22 is pulled out in the direction of pushing out from the support pin 60.

1 is a perspective view of a stationary blade attaching / detaching device according to a first embodiment of the present invention. 1 is a top view of a stationary blade attaching / detaching device and a blade ring according to a first embodiment of the present invention. It is a side view of the stationary blade attaching / detaching apparatus according to the first embodiment of the present invention. It is a perspective view of the movable bracket which concerns on the 1st Embodiment of this invention. It is a top view, a side view, and a perspective view of a stationary blade attaching / detaching device and a blade ring according to a second embodiment of the present invention. It is the perspective view and front view of the conventional stationary blade attaching / detaching apparatus.

Explanation of symbols

02 Device body (Conventional stationary blade attaching / detaching device body)
04 Claw part 05 Wire material 06 Winding machine 07 Holding plate 08 Spacer 09 Fixing plate 010 Pin 011, 012 Bolt 020 Blade ring 021 Static blade engaging part (heat shield ring) of blade ring
022 Stator blade (Static blade block)
1 Guide rail 1a Guide rail joint plate 1b Guide rail through hole 1c Guide rail upper surface 1d Guide rail side surface 2 Support bracket 2a Support bracket foundation 2b Support bracket joint 2c Support bracket lateral fixing plate 2d Support bracket Through-hole 2e of support bracket lateral fixing plate 3 Movable bracket 3a Movable bracket base 3a 'Protruding area of movable bracket base 3a 3b Movable bracket joint 3d Movable bracket through-hole 4 Arm telescopic device (hydraulic cylinder)
5 Guide rail support legs 7a, 7b Fixing pin 10 Insertion pin 20 Blade ring 20a Side surface of blade ring 20b End of semicircular blade ring (joint surface)
20d Outer peripheral surface of blade ring 21 Stator blade engaging portion of blade ring 22 Stator blade (static blade block)
22a Outer shroud of stationary blade 22b Stress relief groove of outer shroud of stationary blade 50 Pressing block 50a Joint portion of pressing block 50b Through hole 51, 61 pin 52 Fixed pin 60 Support pin 60a Joint portion of supporting pin

Claims (10)

In the apparatus for inserting or extracting the stationary blade in the circumferential direction of the blade ring in the stationary blade engaging portion in the blade ring of the divided turbine,
A guide rail extending from the divided end of the blade ring and fixed to the blade ring so that the upper surface forms the same plane as the side surface of the blade ring;
A support bracket that can be fixed to the side surface of the wing ring or the upper surface of the guide rail;
A movable bracket that grips the stationary blade and slides in a direction in which the stationary blade is inserted or withdrawn while making surface contact with the upper surface of the guide rail or the side surface of the blade ring;
A stationary blade insertion / extraction device comprising: an arm telescopic device having one end connected to a support bracket and the other end connected to a movable bracket. The stationary blade insertion / extraction apparatus according to claim 1 , wherein the support bracket can be fixed at a desired position on the side surface of the blade ring or the upper surface of the guide rail. The support bracket and the movable bracket are provided with a joint portion at an equal height from the side surface of the blade ring or the upper surface of the guide rail, and the support bracket and the movable bracket are connected to the arm telescopic device via the joint portion. The stationary blade insertion / extraction device according to claim 1 . In a device for inserting or extracting a stationary blade in a circumferential direction of a blade ring in a stationary blade engaging portion of a turbine blade ring,
A support pin that can be inserted and fixed from the inner peripheral side of the blade ring to a hole appropriately provided in the circumferential direction of the blade ring; and
A pressing block that holds the stationary blade and is movable in a direction in which the stationary blade is inserted or pulled out from the blade ring;
An arm telescopic device having one end connected to the support pin and the other end connected to the pressing block;
A stationary blade insertion and extraction device, wherein a portion where the arm expansion device and the support pin are connected and a portion where the arm expansion device and the pressing block are connected are located on the inner peripheral side of the blade ring. In a method of assembling a blade ring into which a stationary blade is inserted by the stationary blade insertion / extraction device according to any one of claims 1 to 3 ,
Extend and fix the guide rail to the end of the divided blade ring so that the side surface of the blade ring and the upper surface of the guide rail form the same surface,
A movable bracket is arranged on the guide rail so that the stationary blade is gripped by the movable bracket, and the support bracket is attached and fixed to the guide rail in a state where the arm of the arm telescopic device is contracted with respect to the arrangement position of the movable bracket.
Thereafter, by extending the arm expansion / contraction device, the vane held by the movable bracket is pushed out and inserted into the vane engaging portion of the vane ring. In a method of assembling a blade ring into which a stationary blade is inserted by the stationary blade insertion / extraction device according to any one of claims 1 to 3 ,
Extend and fix the guide rail to the end of the divided blade ring so that the side surface of the blade ring and the upper surface of the guide rail form the same surface,
A movable bracket is arranged on the guide rail so that the stationary blade is gripped by the movable bracket, and the support bracket is attached and fixed to the blade ring in a state where the arm of the arm expansion / contraction device extends with respect to the arrangement position of the movable bracket,
Thereafter, by retracting the arm expansion and contraction device, the stationary blade held by the movable bracket is drawn into the stationary blade engaging portion of the blade ring and inserted. A method for assembling a blade ring into which a stationary blade is inserted by the stationary blade insertion / extraction device according to claim 4 ,
While holding the stationary blade on the pressing block, with the arm of the arm expansion / contraction device contracted with respect to the arrangement position of the pressing block, the support pin is attached and fixed to a hole appropriately provided in the circumferential direction of the blade ring,
Thereafter, by extending the arm expansion / contraction device, the stationary blade held by the pressing block is pushed out and inserted into the stationary blade engaging portion of the blade ring. A method for assembling a blade ring into which a stationary blade is inserted by the stationary blade insertion / extraction device according to claim 4 ,
While holding the stationary blade to the pressing block, with the arm of the arm telescopic device extended with respect to the arrangement position of the pressing block, the support pin is attached and fixed to a hole appropriately provided in the circumferential direction of the blade ring,
Thereafter, by retracting the arm expansion / contraction device, the stationary blade held by the pressing block is drawn into the stationary blade engaging portion of the blade ring and inserted. In the method of extracting a stationary blade from a blade ring by the stationary blade insertion drawing apparatus according to any one of claims 1 to 3 ,
Attach the movable bracket to the blade ring so that the movable bracket grips the stationary blade arranged in the stationary blade engaging part of the blade ring,
Attach the support bracket to the wing ring and fix it with the arm of the arm telescopic device contracted relative to the position of the movable bracket,
Thereafter, the stationary blade extraction method is characterized in that the stationary blade held by the movable bracket is pushed out and pulled out from the stationary blade engaging portion of the blade ring by extending the arm telescopic device. In the method of extracting a stationary blade from a blade ring by the stationary blade insertion drawing apparatus according to any one of claims 1 to 3 ,
Attach the movable bracket to the blade ring so that the movable bracket grips the stationary blade arranged in the stationary blade engaging part of the blade ring,
Attach and fix the support bracket to the wing ring with the arm of the arm telescopic device extended relative to the position of the movable bracket,
Thereafter, by retracting the arm expansion / contraction device, the stator blade held by the movable bracket is drawn into the stator blade engaging portion of the blade ring and extracted.

Images