JPS62243903A - Apparatus for handling turbine diaphragm - Google Patents

Abstract

PURPOSE:To reduce operational man-hours for preservation and inspection of a diaphragm by providing a diaphragm over-turning preventing frame and a diaphragm carrier on a movable bed plate movable on rails. CONSTITUTION:A movable bed plate 9 is movably provided on rails 3, 7 of a frame work 1, and a diaphragm overturning preventing frame 18 and a diaphragm carrier 17 are provided on the movable bed plate 9. Further, while a work table 26 is provided at the outermost side of said plate 9, a lift capable of adjusting the height of the diaphragm on said plate 9 is provided. Thus, all operations such as the dye removal, inspection, repair, etc. of the diaphragm can be carried out by an operator on said plate 9 of the work table 26 so that operational man-hours and a working space can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a turbine diaphragm handling device.

[Prior art]

In a steam turbine, a steam flow supplied from a steam source such as a boiler or a nuclear reactor passes through a multi-stage impeller installed in a turbine rotor, converting the energy of the steam into rotational power to power a generator, etc. It is the prime mover that drives it. Between each stage of the multi-stage impeller, there is a nozzle-type steam flow path called a diaphragm for the purpose of changing the flow direction of steam. is formed by.

The number, diameter, and weight of these diaphragms increase as the turbine capacity increases.1For example, in a 1.1 million kilowatt class nuclear power turbine, there are approximately 140 diaphragms in total for one high-pressure casing and three low-pressure casings. The maximum diameter is approximately 5m.
It is a large and heavy part, weighing about 10 tons per semicircular piece.

FIG. 18 is an upper half sectional view of one casing constituting a normal turbine. R is a rotor, and a plurality of diaphragms D are installed in multiple stages symmetrically with respect to a center line perpendicular to the axis of the turbine on the upstream side of rotor blades B that are installed in the rotor R and rotate. Figure 19 is a schematic diagram of the equipment layout on the turbine floor of a 1.1 million kilowatt class nuclear power plant, and shows the turbine installation location A.
Inside, there is a high pressure compartment HP, a first low pressure compartment ALP, a second low pressure compartment BLP, a third low pressure compartment CLP, and a generator GEN.

Exciter EX is installed. High pressure compartment HP, 1st and 2nd
1 The third low pressure compartment ALP, BLP, and CLP are the first and third low pressure compartments, respectively.
It is a double flow type as shown in Figure 8.

For periodic inspections (hereinafter referred to as periodic inspections) of steam turbines, a temporary storage space was required from disassembly to completion of assembly for decontamination, inspection, and repair. In other words, in order to visually and non-destructively inspect the damage to the diaphragm, it is necessary to clean the surface to be inspected that has been contaminated with radioactivity during turbine operation. ) is being carried out. After the inspection, repairs were carried out as necessary (cutting out damaged areas, overlay welding), and these decontamination, inspection, and repair operations were performed at separate locations. In Fig. 19, B and C are the diaphragm storage areas, and G is the dimension line of the operating range of the overhead traveling lane (hereinafter referred to as the overhead crane).
span).

The diaphragm storage area B is located within the operating range of the overhead crane, and the diaphragm storage area C is located outside the operating range. Further, D is a hoisting area, E is a mole rail crane rail, F is a decontamination area, and an inspection area and a repair area (none of which are shown) are also provided. Then, the diaphragm was hoisted by an overhead crane, hoisted by a mole rail crane at the hoisting yard, and then stored at the diaphragm yard C.

FIG. 21 is an explanatory diagram of a state in which five upper half diaphragms are stored in a conventional diaphragm storage area, and diaphragm D
is placed on a pedestal from a space T partitioned by a frame S, and an inspection space U with a width of about 500 mm is provided between the diaphragms 0 of each other. However, in its current state, it is not possible to carry out work such as decontamination, inspection, or repair, and its only function is to temporarily store and store the diaphragm. It had to be transported as shown in Figure 20. On the other hand, the overhead crane for the turbine room of the 1M power plant is a large crane with a lifting capacity of around 200 tons, and both the machine and traveling speed are extremely slow.Moreover, the mole rail crane also has a moving speed due to the lifting and moving of heavy objects. Moreover, it took time to rehang heavy objects.

[Problem that the invention seeks to solve]

In the past, the space required for decontamination, inspection, and repair work areas was set up independently as mentioned above.
There is also the problem that the turbine must be installed on a limited floor surface.

There was a problem in that each diaphragm was transported back and forth to the relevant work site one by one for decontamination, inspection, and repair to prepare for the work using a slow overhead crane, which required an extremely large number of man-hours.

The present invention has been made in view of the above circumstances.

The object of the present invention is to provide a turbine diaphragm handling (setup work such as maintenance inspection) device that can reduce the number of man-hours for setup work such as diaphragm maintenance inspection, etc., and can also reduce work space for maintenance inspection etc.

[Means for solving problems]

The purpose of the above object is to provide a mount device in which a fall prevention frame is provided on both end faces of a diaphragm to be placed, a movable base plate having a diaphragm holder on the upper surface, and is movable in the direction in which the diaphragms are arranged. a movable platform device supported by a movable platform device; a gantry device that supports a plurality of the movable device devices on a rail so as to be freely displaceable in the arrangement direction of the diaphragms; A workbench is provided which is formed so that the diaphragm on the movable tabletop can be positioned between the movable tabletop, and a workbench whose position can be adjusted up and down. This can be achieved by a turbine diaphragm handling device that is provided with a workbench device configured to allow the above-mentioned movement to be carried out, and a lifting device configured to be able to adjust the height of the diaphragm on the movable bed plate.

[Effect]

As described in the description of the embodiment described later, in a state where a plurality of diaphragms D are collectively arranged on the workbench bag [26], the movable table plate 9 on which the diaphragms D are placed is placed in the arrangement of the diaphragms D. All regular inspection work of decontamination, inspection, and repair is carried out by workers who are positioned on the movable base plate 9 of the work bench bag W26 that is adjusted to move in the direction and is positioned adjacent to or between the movable base plate 9 on the outermost side of the movable base plate 9. It is designed to do all of the following. A fall prevention frame 18 that prevents falling on the movable base plate 9
can be moved up and down so as not to interfere with the work, and the diaphragm D on the movable table plate 9 can be adjusted by a lifting bag [19] so that work can be done on the lower surface.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The turbine diaphragm handling device of the present invention will be explained below using embodiments with reference to FIGS. 1 to 17. Figure 1 is a perspective view of the diaphragm workshop device, Figure 2 is a front view of the moving platform device in Figure 1, Figures 3 and 4 are the plan view and side view of Figure 2, and Figure 5 is the A detailed view of part H in the figure, Figure 6 is a perspective view of the movable base plate in Figure 5 when the upper half diaphragm is supported,
7 is a front view of FIG. 6, FIG. 8 is a front view of FIG. 6 with the lower half diaphragm supported, FIG. 9 is a perspective view of the diaphragm lifting device of FIG. 6, and FIGS. 10 and 11. The figure is an explanatory diagram of the operation in Figure 9, and Figure 12 is a perspective view of the workbench device in Figure 1.
FIG. 13 is a detailed view of a part of FIG. 12, and FIG. 14 is a front view of the workbench device shown in FIG. 12.

15 to 17 are explanatory views of the work on the workbench in FIG. 12.

The main parts of this device can be roughly divided into a gantry device ll that supports the entire device, a moving platform device 43 (see Figure 1 above) for placing the diaphragm D and moving it in the longitudinal direction, and Lifting bag for moving to [! 19 (9th
(see figure), a workbench device 126 (see figure 12) for workers to sit on during decontamination or inspection work, and a work device 41 (see figure 15, figure 15) for decontamination, inspection, repair, etc. (see FIG. 16). Stand bag W11, moving table bag [143, lifting device 119, and work table device 126
A diaphragm working outfit fi37 is constructed by the above.

In FIGS. 1 to 5, 1 is a pedestal device.

2 is a support beam, 3 is a linear bearing rail, 4 is a screw shaft,
5 is a motor, 8 is a rail, 9 is a moving base plate, 10 is a linear bearing, 11 is an electromagnetic clutch body, 12 is a clutch plate, 13
is an electromagnet. Further, 33 is a workbench. Frame device! 1 is provided with a linear bearing rail 3 on a support beam 2, and a diaphragm pedestal 17 is mounted on a movable base plate 9 supported by a linear bearing 10 that fits on the rail 3 and is movable from side to side. A frame 18 is provided. Moving base plate 9
A screw shaft 4 passing through the electromagnetic clutch main body 11 and the clutch plate 12 is attached to the lower part thereof so as to be rotationally driven by a base plate moving motor 5.

In FIGS. 6 to 8, a fall prevention frame 18 is screwed onto a screw shaft 16 that is loosely fitted into a column 14 set up on a movable table plate 9 and is rotationally driven by a motor 15. The fall prevention frame 18 is moved up and down by rotation.

In FIGS. 9 to 11, the lifting column 20 is
It is supported by a linear bearing rail 7 and two linear bearings laid on the frame beam 6, and can be moved left and right on the frame beam 6 in the arrangement direction of the diaphragm D. When 22 is rotated, the screw 22
The suspension beam 23 that is screwed together moves up and down. The hanging hook 24 provided on the hanging beam 23 moves up and down, and the diaphragm D can be raised and lowered via the hanging hook 24 provided on the hanging beam 23 and the wire rope 25.

In FIGS. 12 to 14, the mount device! A suspension plate 29 is superimposed on a workbench moving plate 28 supported by a pair of left and right linear bearings 27 that fit on rails 8 supported on a horizontal frame 44 on i1, and A workbench 33 is attached via a mounting plate 32 in the form of a bridge. A wire rope 34 is connected via a wire drum 35 and a pulley 45 driven by a motor 36 for raising and lowering the work platform.
The workbench 33 is suspended by. In addition, the moving plate 28
A traverse motor 38 is provided at both ends of the traverse frame 4 , and a pinion 39 driven by the traverse motor 38 is connected to the horizontal frame 4 .
Binion 39 is placed on the rack 40 attached to the side of 4.
moves while rotating.

The moving plate 28 and a set of workbench related devices attached to the moving plate 28 are configured to traverse in the longitudinal direction of the rail 8. 15 and 16 show the relationship between the handling operation of the device and the working device of this embodiment. FIG. 15 shows an example in which the working device 41 is separate and installed separately, and FIG. 16 shows the working device 41 This is an example in which it is installed integrally on the top of the device.

Next, the operation of the apparatus of this embodiment will be explained. During periodic inspections of nuclear power turbines, etc., the 18th
As explained in FIG. 21 and FIG. 21, each round-trip transportation process is required from the turbine casing to the diaphragm storage area and from the diaphragm storage area to each work site. Arrangements are being made so that the application can be filed separately before or after this application. The content of this proposal is to make it possible to simultaneously transport multiple diaphragms in the turbine chamber via a suspension transport device that lifts each diaphragm on a tower unit, thereby reducing the number of man-hours and time required for transport handling. The present application is a setup device that allows honing work for decontamination, inspection, maintenance, etc. to be performed all at the same place after a diaphragm is placed in the diaphragm workshop equipment, and the above-mentioned lifting i
Regular inspection work can be done extremely efficiently by performing it simultaneously with S equipment.

First, a separately filed portable turbine diaphragm suspension and transportation system! ! (hereinafter referred to as a suspended transport device) is used to install a diaphragm workbench! The diaphragm D carried onto the diaphragm 37 is suspended and placed on the diaphragm pedestal 17 of the diaphragm workshop apparatus 37 on each stage by the suspension transport device, like the diaphragm DI-D7 shown in FIG. At this time,
The spacing between the pedestal devices in each paragraph is aligned to the minimum spacing in the device configuration, as shown in FIG. When performing honing work or inspection from this state 1 For example, when working on the left side of diaphragm D3 in Fig. 4, widen the space between diaphragms D3 and D4 to secure the space necessary for the work. At the same time, it is necessary to locate a work table 33 on which a worker and work equipment are to be placed within this space.

In Figure 4 - the workbench device! 26 are at both ends of the diaphragm workbench device 37, and the workbench 33 is located at the top of the vertical stroke, with a space below.

In order to widen the distance between the diaphragms Da, when the base plate moving motor 5 shown in FIGS. 3 and 4 is driven, the screw shaft 4 rotates and is screwed into the screw shaft 4 as shown in FIG. A movable base plate 9 on which the diaphragm holder 17 of each paragraph is placed.
The clutch plate 12 idles within the electromagnetic clutch body 11. Diaphragm D1. When the electromagnetic clutch body 11 in the pedestal device of Dz and Da is turned on, the clutch plate 12 is attracted and fixed to the electromagnetic clutch body 11 by the action of the electromagnet 13.
moves. That is, the axial thrust is transmitted to the clutch plate 12, the electromagnetic clutch main body 33, and the movable base plate 9, and the movable base plate 9, which is supported by the linear bearing 10 fitted to the linear bearing rail 3, is a diaphragm. DI, Dz, D
Move to the right at the same time with a placed on each side. In advance, the electromagnetic clutch main body 11 is turned off after moving a specified required distance. As a result, the fixing force of the clutch plate 12 to the clutch body 11 is released, and the clutch plate 12 is fixed to the screw shaft 4.
At the same time, the movement of each movable table plate 9 to the right is stopped.

In addition, the base plate moving motor 5 is temporarily stopped, and the diaphragm D 41 D IS+ D B is rotated in the opposite direction.
When each electromagnetic clutch body 11 with the movable base plate 9 for +D7 is turned on, the diaphragm Da
The movable base plates 9 carrying D7 are simultaneously moved to the left, and when they have moved a required distance, the electromagnetic clutch main body 11 is demagnetized to stop the movement of each movable base plate 9. Diaphragm D1~D
The sum of the amount of rightward movement of diaphragms o8.3 and the leftward movement of diaphragms Da to D7 is This is the work space formed between D4.

Next, workbench bag ff! 26 to the above-mentioned work space will be explained. When the traversing motor 38 shown in FIGS. 12 and 13 is driven, the pinion 39 moves to the rack 4.
0 and rotates.

Therefore, the movable plate 28 moves along the rail 8 in the space above the diaphragms D1 to D8 together with related devices supported by the movable plate 28, and the traversing motor 3 is moved at a position above the working space.
Stop 8. Then, necessary work is performed using a work device 41 such as a honing device or an inspection device shown in FIGS. 15 and 16. In this work process, Figure 7,
Since the diaphragm overturn prevention frame 18 shown in FIG. 8 is close to the side surface of the diaphragm D, it may become an obstacle to the work. For example, during honing work, when spraying honing powder, spraying a test liquid, or coming into contact with equipment, it is difficult to work only at the height of the fall prevention frame 18, so it is necessary to move the fall prevention frame 18 up and down.

6 to 8 are explanatory diagrams of a device for vertically moving the fall prevention frame 18 for this purpose. In the figures, when the motor 15 for raising and lowering the frame is driven, a screw 16 driven by the motor 15
rotates, and the fall prevention frame 18 screwed onto the screw 16 can be moved up and down.

On the other hand, during this work process, there are cases where it is desired to move the diaphragm D up and down, and in this case, the
Diaphragm lifting device f! shown in the figure! 19 is used. For example, it is difficult to clean or inspect the part in contact with the diaphragm holder 17, and during this partial cutting work, the diaphragm D is temporarily lifted to create a work space between it and the diaphragm holder 17. There is a need. In such a case, after connecting the diaphragm D and the hanging hook 24 with the wire rope 25 or the like, the lifting motor 42 can be driven to move the hanging beam 23 upward to lift the diaphragm D. The support column 20 is movable along the rail 8 in the axial direction of the screw shaft 4, and can be moved to the position of the diaphragm D to be lifted and shared by the diaphragm D of each stage.

Therefore, the diaphragms D1 to D7 are placed on the plurality of diaphragm holders 17 on the diaphragm workshop apparatus 37 shown in FIG. 1, as shown in FIGS.
The workbench bag v! is placed between the diaphragms D1 to D7. Create a workbench bag with space for 126! ! Insert the workbench device l from both sides of the diaphragm! The height of the diaphragm on which decontamination, inspection, repair, etc. are performed is adjusted using the lifting bag [19].
inspection.

It is not necessary to move the diaphragm D to the relevant work site each time each work such as repair is to be performed.

In this way, the turbine diaphragm handling device of this embodiment is configured so that decontamination, inspection, and repair work for the diaphragm during periodic inspections can be performed in one place. 1 between storage area and work area
If the product is transported back and forth several times, three types of work can be performed, so the number of man-hours required for setup work (transportation) can be significantly reduced.

Further, since there is no need to provide a workshop for each task, the space of the workshop can be significantly reduced. In the above example, 5
Although we have explained the case where the work platform device and the lifting device are installed so that they can run freely on the rails that are installed outside the movable platform plate attachment position on the gantry device, it is important that they are not installed on such rails. Even if it is configured to be transported by an overhead crane to the required location, the effect will be the same.

〔Effect of the invention〕

As described above, the turbine diaphragm handling device of the present invention has the effect of significantly reducing the man-hours required for setup during maintenance and inspection of the diaphragm, as well as significantly reducing the workspace required for maintenance and inspection.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a diaphragm workshop device of an embodiment of the turbine diaphragm handling device of the present invention, Fig. 2 is a front view of the moving platform device of Fig. 1, and Figs. 3 and 4 are Fig. 2, respectively. 5 is a detailed view of the H part in FIG. 4, and FIG. 6 is a perspective view of the movable base plate in FIG. 5 in a state in which the upper half of the diaphragm is supported. 7 is a front view of FIG. 6, FIG. 8 is a front view of FIG. 6 in a state in which the lower half diaphragm is supported, FIG. 9 is a perspective view of the diaphragm lifting device of FIG. 6, and FIG. 10. Fig. 11 is an explanatory diagram of the operation of Fig. 9, Fig. 12 is a perspective view of the workbench device of Fig. 1, Fig. 13 is a detailed view of the work part of Fig. 12,
Figure 14 is a front view of the workbench device in Figure 12, Figures 15 to 17 are explanatory views of the work on the workbench in Figure 12;
Figure 8 is a cross-sectional view of the upper half of one casing that constitutes a normal turbine, Figure 19 is a schematic diagram of the equipment arrangement on the floor of a normal turbine, and Figure 20 is a conventional work procedure for the arrangement shown in Figure 19. The explanatory drawing, FIG. 21, is a perspective view of a conventional diaphragm holder. 1... Frame device, 3.7... Linear bearing rail, 9
...Moving base plate, 17...Diaphragm holder, 18.
... Fall prevention frame, 19... Elevating device, 26... Work platform device, 33... Work platform, 43... Moving platform device, D
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Claims (1)

[Scope of Claims] 1. In a device in which a turbine diaphragm is removed from a turbine casing for decontamination, inspection, repair, etc., fall prevention frames are provided on both end surfaces of the diaphragm to be placed, and a diaphragm is provided on the top surface. a movable table device including a movable plate having a pedestal and formed to be movable in the direction in which the diaphragms are arranged and supported by a pedestal device; and a plurality of the movable table devices arranged on rails in the direction in which the diaphragms are arranged. The above-mentioned gantry device supports the above-mentioned movable table plate displaceably, and the workbench is formed so that it can be positioned adjacent to or between the movable bed plate on the gantry device, and whose position can be adjusted up and down. and a workbench device configured to perform decontamination, inspection, and repair work on the diaphragm on the movable tabletop on the workbench, and adjust the height of the diaphragm on the movable tabletop. 1. A device for handling a turbine diaphragm, characterized in that it is provided with a lifting device configured so that it can be lifted and lowered. 2. The scope of the claim, wherein the work platform device and the lifting device are arranged to be movable in the arrangement direction of the diaphragms on a rail provided outside the mounting position of the movable bed plate on the gantry device. The turbine diaphragm handling device according to item 1. 3. The turbine diaphragm handling device according to claim 1, wherein the overturn prevention frame is formed to be vertically displaceable.