JP2736118B2 - Internal pump motor handling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an internal pump for mounting / dismounting an internal pump motor on / from a motor casing in a boiling water reactor provided with an internal pump. The present invention relates to a pump motor handling device.

(Prior art) The conventional boiling water reactor has a jet pump inside the reactor pressure vessel, takes out part of the reactor water outside the reactor pressure vessel, pressurizes it with a recirculation pump, and uses it as driving water. The water is sent to a jet pump and the water is circulated through the core by the jet pump.

However, this method has a problem that the structure becomes complicated and the piping connecting the jet pump and the recirculation pump is disposed outside the reactor, which is not preferable.

Therefore, in recent years, a boiling water reactor equipped with an internal pump has been developed as shown in FIGS. 20 and 21 in order to arrange a recirculation pump in the reactor and eliminate piping.

As shown in FIG. 20, this type of boiling water reactor has a structure in which a shroud 2 is provided in a reactor pressure vessel 1 and a reactor core 3 is accommodated in the shroud 2. A plurality of internal pumps 4 of, for example, about 10 are provided in the vicinity of the bottom of the unit 1. Then, the reactor water in the reactor pressure vessel 1 descends in a downcomer 5 formed between the outer peripheral surface of the shroud 2 and the inner peripheral surface of the reactor pressure vessel 1, and the internal pump 4 3, and flows into the core 3.

The reactor water flowing into the reactor core 3 boils due to heat generated by the nuclear reaction, flows upward as a two-phase flow of water and steam,
Water and steam are separated by a steam separator 6 above the reactor core 2. The separated steam is subjected to a steam drier 7 to remove moisture, and then a turbine (not shown).
The separated water is supplied to the core again by the internal pump 4 together with the water supplied from the water supply sparger 8.

As shown in FIG. 20, about 200 control rod drive mechanisms 9 are provided at the bottom of the reactor pressure vessel 1, and control rods (not shown) are provided by these control rod drive mechanisms 9. Is inserted or withdrawn into the core 3 so that the half concentration or the like of the core 3 is controlled.

As shown in FIG. 21, the internal pump 4 includes a pump unit 10 having a diffuser 11 and an impeller 12, and the diffuser 11 is provided with a stretch tube 13 and a stretch tube nut 14 for the reactor pressure vessel 1. It is pressed onto the pump nozzle 15 and connected to a motor casing 16 inserted into the pump nozzle 15 from below.

As shown in FIG. 21, a water immersion type motor 17 is accommodated in the motor casing 16, and a motor cover 17a is attached to a lower end of the motor 17. The motor cover 17a is in close contact with the lower surface of the motor casing 16, is fixedly fastened to the motor casing 16 by a nut 19 screwed on a stud bolt 18, maintains liquid tightness, and attaches the motor 17 to the motor casing 16. It is fixed to. The motor 17 and the impeller 12 are connected by a shaft 20 so as to drive the impeller 12 via the shaft 20.

The internal pump 4 having the above configuration needs to be periodically disassembled and removed, and the removed parts need to be inspected and repaired at another place outside the reactor containment vessel.

For disassembly and removal of the internal pump 4, first, the connection between the motor 17 and the shaft 20 is released, the nut 19 is removed, the motor 17 is pulled down from the motor casing 16, and then the impeller 12 and the shaft 20 are pulled up. Further, this is performed by removing the stretch tube nut 14 and removing the diffuser 11 upward. And the removed motor 17
Passes through a cylindrical pedestal that supports the reactor pressure vessel 1 and is carried out of the pedestal through an equipment port formed in the peripheral wall of the pedestal. The assembly and mounting of the internal pump 4 are performed in the reverse procedure.

The pedestal houses a control rod drive mechanism 9 projecting from the bottom of the reactor pressure vessel 1, a neutron detector assembly (not shown), and a number of pipes and arrangements connected thereto. Therefore, there is little room for space. Also,
Since the motor 17 is large and heavy, it is extremely troublesome to remove the motor 17 from the motor casing 16 and carry it out of the pedestal, or to carry the motor 17 into the pedestal and attach it to the motor casing 16.

Therefore, conventionally, the work is performed using an internal pump motor handling device as shown in FIGS. 22 to 25.

As shown in FIGS. 22 to 25, a conventional internal pump motor handling device is provided in a cylindrical pedestal 21 supporting a reactor pressure vessel 1 and formed on a peripheral wall portion of the pedestal 21 through an equipment loading port. A rotating platform 23 corresponding to 22 is provided. The rotary platform 23 has a substantially circular shape, is guided by a spherical rail 25 supported by the pedestal 21 via a support member 24, and rotates about a vertical axis.

At a position below the rotating platform 23, as shown in FIGS. 22 and 23, a lower platform 26 which is integral with the rotating platform 23 is provided, and between these two platforms 23, 26, Guide 27 is attached. Then, the elevating table 28 on which the motor 17 is mounted
Is moved up and down by being guided by the guide 27 via a guide roller 29 for elevating.

As shown in FIG. 22, FIG. 23 and FIG. 25, a drive unit 31 for driving the right-handed screw guide screw 30 and the left-handed screw guide screw 30a is attached to the lift 28.
The nut 19 of the motor cover 17a
An attachment / detachment machine 31a for attaching / detaching is attached.

On the lower platform 26, as shown in FIG.
An electric hoist 32 is attached, and each of these electric hoists 23 has the other end of a wire rope 34 connected at one end to a wire rope support 35 of a lifting platform 28 via a pulley 33 provided on the rotating platform 23, Rewind and rewind. Thus, the elevating platform 28 moves up and down.

When transporting the motor 17 from the inside of the pedestal 21 to the inspection / repair room, a transport vehicle 36 is used as shown in FIG. 24, and the transport vehicle 36 is a rail 37 on the rotating platform 23 and a rail on the skeleton side. It is designed to run between 38 and.

As shown in FIG. 24, a pair of support members 39 are protrudingly provided on the carrier trolley 36.
The support pins 41 of the motor cask 40 are supported, and the carrier
The motor cask 40 can be supported in a horizontal state by rotating the motor cask 40 about the support pin 41.

The motor cask 40 has a cylindrical container shape with an upper end closed, and the motor cask 40 is placed in contact with the reactor water of the motor 17 by covering the motor 17 and attaching the lower end to the motor cover 17a of the motor 17. The part that had been covered can be completely covered.

On the other hand, at the upper end of each guide screw 30, 30a, the 25th
As shown in the figure, a bearing 42 is provided, and a connector 43 is provided at the lower end of each guide screw 30, 30a.
Are mounted respectively, and each guide screw 30,3
Nuts 44 and 45 are screwed in the middle part of 0a, respectively.

The motor casing 16, the motor 17, and the detachable machine 31
On both sides of a, hook pieces 46, 47 and 48 are provided as shown in FIG. 25, respectively.
A bearing 42, and a nut 47 on a hook 47 of the motor 17.
However, nuts 45 are respectively attached to the hook pieces 48 of the detachable machine 31a. The connector
43 is connected to the driving device 31. Thus, the guide screws 30, 3 are driven by the drive device 31.
0a is rotationally driven, and the rotational drive is converted into linear motion by nuts 44 and 45, so that the motor 17 and the attaching / detaching machine 31a move up and down.

The hook piece 46 of the motor casing 16 is attached to the motor casing 16 by a bolt 49, as shown in FIG. 22, and when the guide screws 30, 30a are not used, the bolt 49 is removed, so that the hook piece 46 It is designed to be removed from the motor casing 16.

In the above configuration, the motor of the internal pump 4
When removing 17, the rotation platform 23 is first rotated, the elevator 28 is positioned immediately below the motor 17 to be removed, and the elevator 28 is raised to a position above the rotating platform 23.

Next, the guide screws 30, 30a are
Then, the guide screws 30, 30a are rotated by the drive device 31, and the detachable machine 31a is raised to the position of the motor cover 17a attached to the motor casing 16.
Then, the bolt 19 is removed by the attaching / detaching machine 31a, and the motor 1
Remove 7

Next, the guide screws 30, 30a are rotated in the reverse direction, the detached motor 17 and the detachable machine 31a are lowered onto the elevating table 28, and then the guide screws 30, 30a are removed.

Next, the electric hoist 32 is driven to lower the elevator 28 to the position indicated by the symbol A in FIG.
By rotating 23, the motor 17 is moved to a position corresponding to the equipment entrance 22.

Next, the motor cask 40 is lifted by the electric hoist 32a shown in FIG. 24, and the motor cask 40 is mounted on the motor 17 and integrated. Then, this integrated product is
Lift up to a position that does not interfere with 36, rotating platform 23
It is rotated until the upper rail 37 and the rail 38 on the skeleton side coincide.

Next, the transport trolley 36 is moved to above the rotating platform 23, and the motor cask 40 is lowered to above the transport trolley 36. Then, after being rotated and supported to the horizontal state, the transport cart 36 is discharged to the outside of the pedestal 21 through the device entrance 22.

When the motor 17 is mounted on the motor casing 16, the procedure is reversed.

(Problems to be Solved by the Invention) The conventional internal pump motor handling device having the above configuration has the following problems.

That is, two electric hoists 32 are used to drive the elevating platform 28 up and down.
34, but the load varies greatly between when the motor 17 is mounted on the lift 28 and when it is not mounted.Therefore, there is a tilt and position change of the lift 28 due to the elongation of the wire rope 34. Is unstable. Further, since the speed tuning of the two electric hoists 32 is performed by an electric operation method, there is a problem that a synchronization shift occurs due to an electric failure, and the elevator 28 is tilted to make the elevator unstable.

The movement of the motor 17 between the rotating platform 23 and the motor casing 16 is performed by converting the rotating force of the guide screws 30, 30a into the lifting force of the motor 17, but the lifting platform 28 is moved to the rotation platform 23. Since it is structurally impossible to raise the screw above the upper surface, guide screws 30 and 3
There is a problem that the length of 0a has to be increased, and therefore, there is a danger that vibration occurs when the motor 17, which is a heavy object, goes up and down.

In addition, the drive device 31 of the guide screws 30, 30a is positioned directly below the motor casing 16 by the rotation of the rotary platform 23.
After being connected to the drive device 31 of 0,30a, the guide screw 30,
It is necessary to confirm the verticality of 30a and finely adjust the driving device 31 again to eliminate the inclination of the guide screws 30, 30a. If this operation is not performed, the motor casing
When attaching and detaching the motor 17 to and from the motor 16, the motor 17 may come into contact with the motor casing 16.

In addition, since the conventional drive device 31 uses a chain or a belt as its power transmission means, a speed difference and a phase difference are generated between the guide screws 30, 30a due to their elongation and slack, and the guide screws 30, 30a There is also a problem that the nuts 44 and 45 bite.

Further, when coupling the drive shaft of the drive device 31 and the guide screws 30, 30a, it is not possible to adjust the vertical position by the drive shaft alone, so it is necessary to raise and lower the entire lifting platform 28 for coupling. However, there is a problem that fine adjustment is not easy and a long time is required for coupling since the lifting and lowering is performed by mounting a heavy object such as the motor 17.

Further, the guide screws 30 and 30a need to be completely removed from the motor casing 16 after removing the motor 17 from the motor casing 16 and lowering the motor 17 on the elevating platform 28.
For this reason, when removing the stretch tube 13 and the secondary seal, the guide screws 30, 30a need to be mounted on the motor casing 16 again, which takes a lot of time. In particular, since these operations are performed in a radiation operation environment, it is required to complete the operations in as short a time as possible.

The present invention has been made in consideration of such points,
An object of the present invention is to provide an internal pump motor handling device capable of performing work safely and in a short time.

[Configuration of the invention]

(Means for Solving the Problems) The present invention provides, as means for achieving the above object, a rotary platform located below a reactor pressure vessel and driven to rotate around a vertical axis, and an internal pump provided on the rotary platform. An elevating drive device for elevating an elevating table on which a motor is mounted, a guide screw having an upper end swingably connected to a motor casing of an internal pump, a guide screw driving device for driving the guide screw, and a guide screw A wrench for detachably connecting the screw driving device and the lower end of the guide screw, a position adjusting device for finely adjusting the position of the guide screw driving device in the horizontal direction, and separating the wrench portion from the guide screw driving device And a wrench part with a guide screw An up-and-down movement mechanism that moves up and down while maintaining an interlocking relationship with the driving device, wherein the lifting drive device is fixed to the rotating platform and a pair of moving guides that are respectively arranged on both sides of the lifting table and guide the lifting table. A pair of fixed guides for guiding the moving guides up and down, a pair of strings fixed at one end to the fixed guides and the other end fixed to the elevating table via the upper ends of the moving guides, It is characterized by comprising a pair of electric cylinders which are simultaneously driven by a drive motor and move up and down each of the moving guides.

(Operation) In the internal pump motor handling apparatus according to the present invention, when removing the motor, the upper end of the guide screw is attached to the motor casing, and the rotating platform is rotated to position the lifting platform directly below the motor casing. Then, the guide table is raised by the lifting drive device of the lift table, and the guide screw drive device is moved in the horizontal direction by the position adjustment device to perform positioning with the guide screw. Next, the wrench is made manually operable by the clutch mechanism and is moved up and down by the up-and-down movement mechanism to connect the guide screw and the guide screw driving device via the wrench. Then, after that, the wrench portion is linked to the guide screw driving device by the clutch mechanism, and the motor is removed by the same method as in the related art to lower the guide screw driving device. Next, the wrench is made manually operable by the clutch mechanism, and is moved up and down by the up-and-down movement mechanism to remove the wrench from the guide screw. Thereafter, the elevator is lowered, and the rotating platform is rotated. Thereafter, the motor is carried out of the pedestal in the same manner as in the related art.

When the motor is mounted, it is performed in the reverse procedure.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 19. To avoid duplication, the same parts as those shown in FIGS. 20 to 25 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 shows an example of an internal pump motor handling apparatus according to the present invention. In the figure, reference numeral 23 denotes a ring rail 25 (see FIG. 22) which is driven to rotate about a vertical axis. The rotating platform 23 is provided below the rotating platform 23 via a pillar 26a.
6 are provided integrally.

A mounting base 50 is integrally fixed to the lower portion of the lower platform 26 as shown in FIG. 1, and a driving motor 51 is mounted on the mounting base 50 as shown in FIGS. , Worm reducer 52 and two support brackets 53
Are attached, and each support bracket 53 has a pin
The lower ends of a pair of electric cylinders 55 are supported via 54, respectively. The drive motor 51 and the worm speed reducer 52 are coupled by a coupling 56 as shown in FIG. 2, and the worm speed reducer 52 and each motor cylinder 55
Are connected by a coupling 57 as shown in FIG.

As shown in FIGS. 1 and 2, a groove-shaped guide 58 is fixed to each of the columns 26a, and an upper end of each of the electric cylinders 55 is supported via a pin 59. Each of the brackets 60 is attached, and
, A pair of moving guides 61 are fixed respectively.

As shown in FIGS. 1 to 3, a guide groove 61a and a guide roller 62a are attached to each of the moving guides 61, and the guide roller 62a rolls in the guide 58. And the groove 61
a has guide rollers 6 provided on both sides of a lift 65
2b rolls. That is, the guide 58 guides the elevation of the moving guide 61 and the
Numeral 61 guides the elevating table 65 up and down.

As shown in FIGS. 1 and 3
As shown in the figure, pulleys 63 are provided, and the lower ends of both moving guides 61 are connected to each other by a connecting frame 64 in order to position the moving guides 61 in the lateral direction.

1 and 3 are provided inside these two moving guides 62.
An elevator 65 is arranged as shown in the figure.
Chain fixing brackets 66 are attached to both sides of 65, respectively. Further, a chain fixing bracket 67 is attached to each of the guides 58. The chain fixing brackets 66 and 67 are connected via pins to both ends of each chain 68 whose intermediate portion is wound around the pulley 63 from above.

As shown in FIG. 4, each of the guide rollers 62a and 62b has a housing 69 attached to the moving guide 61 or the elevating platform 65 with bolts or the like. Roller 70 is inserted, retaining ring 71
And so on. An angular bearing 72 is inserted into the inner peripheral side of the housing 69, and is prevented from coming off by a bearing support 73. The bearing support 73 is fixed by bolts or the like.

A guide rod 74 is inserted into the inner ring side of the angular bearing 72 as shown in FIG. The guide roller with bearing 70 rolls in the groove of the guide 58 and the moving guide 61.

As shown in FIG. 4, a groove 76 is provided at the bottom of each groove so that a portion outside the center of the flange of the guide rod 74 is in contact with the groove. The guide rod 74 bears a lateral load. When a lateral load is applied, the guide rod 74 comes into contact with the bottom of each of the grooves 58 and 61. At this time, the guide rod is formed by the groove 76.
Only the outer peripheral side of 74 comes into contact, whereby the guide rod 74 rotates while contacting and guides.

As shown in FIGS. 1, 5, and 6, a guide screw driving device 77 for driving the guide screws 30, 30a and a guide screw driving device 77 are mounted on the upper portion of the elevating table 65. , 30a to adjust the verticality of the guide screws 30, 30a by fine adjustment.
Are provided respectively.

As shown in FIGS. 5 and 6, the position adjusting device 78 is provided on an upper portion of the elevating platform 65 and is capable of adjusting the position in the radial direction of the rotary platform 23. The guide screw driving device 77 is detachably mounted on the upper portion of the movable platform 80 via a swing bolt 81. I have. The guide screw driving device 77 is provided with a base on which the motor 17 of the internal pump 4 can be mounted.

As shown in FIGS. 7 to 11, the moving means of the moving table 79 includes four supporting members 82 fixed on the elevating table 65. Each supporting member 82 has a roller with a shaft. 83 are installed respectively. On the other hand, rail
Two rails 84 are attached in parallel, and the shaft-mounted roller 83 rolls on each of the rails 84. Further, one end of each rail 84 is provided with a stopper 85 for preventing the roller with shaft 83 from falling off the rail 84.
A guide roller 86 is attached to the elevating table 65 so as to contact the rail 84.

As shown in FIG.
Is fixed, and a square pillar-shaped nut 88 is fitted into the groove of the towing fitting 87.
89 is screwed. At both ends of the tow fitting 87,
As shown in FIG. 10, holding metal fittings 90 are respectively attached.

As shown in FIG. 7, the screw rod 89 is supported by a bearing 91 attached to the elevator 65, and the elevator 65 has a speed reducer.
92 and a miter gear box 93 are respectively attached, the screw rod 89 and the reducer 92 are connected by a coupling 94, and the reducer 92 and the miter gear box 93 are
They are connected by a coupling 95. A manual handle 96 is attached to the miter gear box 93. By turning the manual handle 96, a screw rod
The nut 88 vertically moves via 89, and is pulled by the pulling fitting 87 so that the movable table 79 moves.

As shown in FIGS. 10 to 14, the moving means of the moving table 80 includes four support fittings fixed to the lower surface of the moving table 80.
97, and these support brackets 97 include rollers 98 with shafts.
Are respectively attached. On the other hand, on the mobile platform 79,
Two rails 99 are mounted in parallel, and the shaft-mounted roller 98 rolls on each of the rails 99. At the end of each rail 99, a stopper 100 for preventing the shafted roller 98 from falling off the rail 99 is attached. A guide roller 101 is also attached to the moving table 80 so as to abut on the rail 99.

As shown in FIGS. 10 to 12, the moving table 80 also includes a tow fitting 87 and a nut 88 fitted to the tow fitting 87.
Further, screw rods 89 screwed into the nuts 88 are provided, and press fittings 90 are attached to both ends of the pulling fitting 87, respectively.

As shown in FIG. 12, the screw rod 89 is supported by a bearing 102 attached to the moving table 79.
A speed reducer 103 and a shaft bearing 104 are provided, respectively, and the screw rod 89 and the speed reducer 103 are connected by a coupling 105, and the speed reducer 103 and the shaft bearing 104 are connected by a coupling 106. ing. And the shaft bearing 104
Is provided with a manual handle 107. By turning the manual handle 107, a nut 8 is
8 moves linearly, the nut 88 comes into contact with the presser fitting 90, the tow fitting 87 is towed, and the movable table 80 moves. In addition, both the moving tables 79 and 80 may be moved by electric driving means.

The guide screw driving device 77 has a gear case 108 as shown in FIGS. 15 and 17, and a substantially central portion of the gear case 108 has external teeth as shown in FIGS. 15 to 17. A swing bearing 109 is attached, and five bearing housings 110 are provided at the bottom of the gear case 108 as shown in FIG. The bearing housings 110 are provided with 111 and 112, respectively.

The bearing 111 is pressed by a bearing retainer 113 as shown in FIG. 17 and FIG.
Are held down by the bearing presser 114.
Shafts 115 are inserted into 11, 112, respectively, and bearing nuts 116
It is fixed at.

Each of these shafts 115 has a gear 117, 11 in the arrangement shown in FIG.
8, 119, 120, 121, and 122 are inserted and arranged by being prevented from rotating by a key or the like, and are further prevented from falling by a holding plate 123 that is stopped by a bolt or the like.

In the upper part of the gears 117, 119, 121, 122, FIG. 16 and FIG.
As shown in the figure, locking pieces 128 meshing with the electromagnetic clutches 124, 125, 126, 127 are attached by bolts or the like, respectively.
A bearing housing 129 is provided above the gear case 108 directly above the gear 117, and a bearing 130 is mounted. A housing 131 is provided above the bearing 130, and a seal 132 is inserted therein. An electromagnetic clutch 124 is attached to a lower portion of the bearing housing 129.

As shown in FIG. 17, a shaft 133 that penetrates the bearing 130, the seal 132, and the electromagnetic clutch 124 is attached to the bearing.
Twenty-four rotating parts 134 are attached in a state where they are stopped by a key or the like. A spline is cut on the outer periphery of the rotating part 134, and the locking piece 135 is engaged with the spline and is engaged and disengaged from the locking piece 128 by an electromagnet of the electromagnetic clutch 124.

As shown in FIG. 17, a mounting base 136 is fixedly mounted on the upper part of the gear case 108, and a driving motor 137 is mounted on the mounting base 136.
It is fixed to 3 in a state where it is prevented from rotating by a key or the like.

At the top of the case 108, which is directly above the
As shown in the figure, bearing housings 138 are provided, and bearings 139 are inserted into these bearing housings 138.
25,126 are attached respectively.

The bearing 139 and the bearings of the electromagnetic clutches 125 and 126 have the 17th
As shown in the figure, a shaft 140 is mounted through the shaft 140, and a locking piece 135 similar to the electromagnetic clutch 124 is provided below the shaft 140.

As shown in FIG. 17, a bearing housing 141 is provided below the mounting base 136.
, Bearings 142, 143 are inserted, and a shaft 144 is inserted into these bearings 142, 143, and a lower end thereof is fitted to the shaft 140 and is prevented from rotating by a key or the like. The shaft 144 has a thread cut at the upper end outer cylinder, a spline cut at the upper end inner cylinder, and a hole and a key groove into which the shaft 140 is inserted in the lower inner cylinder. .

As shown in FIG. 17, a shaft 145 having a cylindrical portion for cutting a spline on the outer periphery and coupling to the upper end and a key groove is inserted into the upper end inner cylindrical portion of the shaft 144.
As shown in FIG. 17, a threaded rod 146 threaded inside the cylinder is screwed into the threaded portion of the outer cylindrical portion of the upper end of the shaft 144.

At the upper end of the shaft 145, as shown in FIG. 17, a hole for a spline or a hexagonal wrench is provided at the upper end of the inner cylinder, and a hole and a key groove for coupling the shaft to the lower inner cylinder are further provided at the lower end. A wrench 147 provided with a flange is inserted, and is locked by a key or the like and coupled. Further, the shaft 145 and the wrench 146 are fixed by a set screw 148 so that the shaft 145 does not fall to the lower part.

As shown in FIG. 17, a housing 149 is provided above the gear case 108 directly above the gear 122, and a seal 150 is inserted therein. An electromagnetic clutch 127 is provided at a lower portion of the housing 149, and a shaft 151 is provided through a shaft of the seal 150 and the electromagnetic clutch 127, and a shaft 151 is provided at a lower portion of the shaft 151. A stop 135 is provided.

As shown in FIG. 17, the shaft 151 is attached to a worm reducer 152 attached to a mounting base 136 by a key or the like so as to be prevented from rotating, and the worm reducer 152 can be manually operated by a manual handle 153. Has become.

 Next, the operation of the present embodiment will be described.

First, a method of driving the guide screws 30, 30a by the guide screw driving device 77 will be described.

First, the locking piece 128 and the locking piece 135 of the electromagnetic clutch 124 are connected, and the locking piece 128 and the locking piece 135 of the electromagnetic clutches 125 and 126 are connected, and the locking piece 128 of the electromagnetic clutch 127 is released. .

In this state, when the drive motor 137 is driven, the gears 117, 1
It rotates in the order of 18, 119, 120, 121. Then, since the gears 119 and the electromagnetic clutches 125 and 126 on the upper part of the gear 121 are connected, the shafts 140 and 144 rotate. Then, the shaft 145 rotates through the spline of the shaft 144 inner cylinder, and the wrench 147
Rotate in places. The wrench 147 is guided by the spline of the shaft 145 by turning the screw rod 146, and can move up and down. The rotation direction of the gears 119 and 121 is the first
They are reversed as shown in FIG.

In this state, when only one of the electromagnetic clutches 125 and 126 is connected, only one of the wrench 147 is driven. This is the driving method using electric driving.

In the case of manual driving, the electromagnetic clutch 127 is connected, the electromagnetic clutches 125 and 126 are connected, and the electric clutch 124 is released. Then, by turning the manual handle 153, the gear 12
It rotates in the order of 2,121,120,109,119,118. Since the gears 119 and the electromagnetic clutches 125 and 126 on the upper part of the gear 121 are connected, both the wrenches 147 can rotate.

In this state, if only one of the electromagnetic clutches 125 and 126 is connected, only one of the wrench 147 is driven.

Next, a case where the motor 17 of the internal pump 4 is removed will be described.

First, guide screws 30, 30a are attached to motor casing 16
Then, the rotating platform 23 is rotated, and the elevator 65 is positioned immediately below the motor 17. Then, the drive motor 51 is driven, and the coupling 56, the worm speed reducer 52,
The two electric cylinders 55 are simultaneously raised via the coupling 57. Then, the moving guide 61 connected to each electric cylinder 55 and the pulley 63 provided on the moving guide 61 are guided by the fixed guide 58 and rise at the same speed as the electric cylinder 55. On the other hand, the chain fixing bracket 66 fixed to the guide 58
The moving end of the chain 68 wound around the pulley 63 is connected to the elevator 65, so that the elevator 65 rises at approximately twice the speed of the electric cylinder 55, and the rotating platform 23 Will rise to a certain level on the upper surface.

In this state, the manual handle 96 of the movable base 79 and the manual handle 107 of the movable base 80 are operated to guide the guide screws 30, 30a.
And the position of the wrench 147 of the guide screw driving device 77.

Next, the electromagnetic clutch of the guide screw driving device 77
With the 125 and 126 in the released state, while turning the wrench 147, align the position of the spline or the hexagon wrench hole of the wrench 147 with the connector 43, turn the screw rod 146, and manually raise the wrench 147, so that the wrench 147 and the connector 43 Is connected. After that, the hook 47 of the motor 17 is attached with the nut 44.

Next, the guide screws 30, 30a are rotated by the guide screw driving device 77, and the detacher 31a is raised to the position of the motor 17 attached to the motor casing 16.
The rotation directions of the guide screws 30, 30a are opposite to each other, and the rotation of the guide screws 30, 30a causes
When the detacher 31a or the motor 17 is raised, it is prevented from rotating in the same direction.

After the nut 19 is removed by the detacher 31a and the motor 17 is removed, the guide screws 30, 30a are rotated reversely, and the detached motor 17 and the detacher 31a are lowered to above the guide screw driving device 77. FIG. 19 shows this state.

Then, turn the screw rod 146, lower the screw rod 146,
Release the electromagnetic clutches 125 and 126 to release the wrench 147 and connector 43
Release torque between and. With this, the wrench 14
The connection between 7 and the connector 43 is released.

Next, while removing the nut 44 from the hooking piece 47, the nut 45 is also removed from the hooking piece 48, and the guide screws 30, 30a
19, the elevator 65 is lowered, and the rotating platform 23 is rotated to move the motor 17 to a position corresponding to the equipment entrance 22.

Next, the motor cask 40 is driven by the electric hoist 32a.
Is lifted, suspended on the motor 17, and mounted on the motor 17. The motor 17 integrated with the motor cask 40
Is lifted to a position where it does not interfere with the transport carriage 36, and the rotating platform 23 is rotated so that the rail 37 on the rotating platform 23 and the rail 38 on the skeleton side coincide.

Next, the transport trolley 36 is loaded, the motor cask 40 is hung on the transport trolley 36, lowered in a horizontal state, and the transport trolley 36 is moved to be transported out of the pedestal 21 from the device entrance 22.

When the motor 17 is mounted, the procedure is the reverse of the above.

As described above, the two electric cylinders 55 are simultaneously driven by one drive motor 51 for raising and lowering the elevator 65, so that the load is greater than in the conventional method of winding the elevator with a wire rope. The rigidity against the fluctuation is high, and the position fluctuation and the inclination of the lift 65 are eliminated. Further, there is no inclination of the elevator 65 due to the synchronization deviation due to the electric failure.

Further, a pair of fixed guides 58, a pair of moving guides 61 that move up and down by the guides 58, and a raising and lowering table that moves up and down along
Since the mechanism including the chain 68 connecting the guide 65 and the guide 58 is used, the lift 65 can be moved up and down with a stroke twice as long as the movement guide 61. Therefore, a large stroke of the lift 65 can be obtained with a short drive stroke,
Further, the lift 65 can be raised to a position above the upper surface of the rotating platform 23. For this reason, the guide screws 30, 30a can be reduced in size, and vibration can be reduced.

In addition, since a position adjusting device 78 is provided above the elevating table 65, the position of the guide screw driving device 77 can be finely adjusted by moving the guide screw driving device 77 in the horizontal direction.
The inclination of 30,30a disappears. For this reason, the motor casing
The motor 16 does not abut against and bite the motor 17.

In addition, when the wrench 147 of the guide screw driving device 77 is connected to the guide screw 30, 30a, the wrench 147 can be moved up and down independently. Can be significantly reduced.

Further, the guide screws 30, 30a can be pivoted outward with the connecting portion to the motor casing 16 as a fulcrum, and the guide screws 30, 30a
Since the coupling between the guide screw driving device 77 and the guide screw driving device 77 is released by lowering and rotating the wrench 147, it is not necessary to remove the guide screws 30, 30a from the motor casing 16 for each operation. For this reason, a tremendous time reduction in a radiation work environment is achieved.

〔The invention's effect〕

As described above, according to the present invention, the handling operation of the internal pump motor can be made safe and easy, and the working time in a radiation environment can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an internal pump motor handling device according to one embodiment of the present invention, FIG. 2 is a plan view showing a drive device portion of the elevator of FIG. 1, and FIG. 3 is FIG. FIG. 4 is a detailed sectional view showing a guide roller portion for guiding the elevation of the elevating platform, FIG. 5 is a front view showing the position adjusting device, FIG. 6 is a left side view of FIG. FIGS. 8 and 9 are diagrams showing the configuration of driving means for a movable platform that adjusts the position of the rotary platform in the radial direction. FIGS.
FIG. 11 and FIG. 11 are main configuration diagrams of FIG. 7 and FIG.
FIG. 12 is a block diagram of a driving means of a moving platform for adjusting the circumferential position of the rotating platform, and FIGS.
FIG. 15 is a schematic diagram showing a gear train configuration of the guide screw driving device, FIG. 16 is a bottom view thereof, FIG. 17 is an enlarged sectional view taken along line XVII-XVII of FIG. 15, FIG. Fig. 15
XVIII-XVIII line enlarged sectional view, FIG. 19 is an explanatory view showing a state where the guide screw is driven to the guide screw driving device, FIG. 20 is a sectional view showing a reactor equipped with an internal pump, FIG. Is a sectional view showing the configuration of the internal pump, FIG. 22 is a configuration diagram showing a conventional internal pump motor handling device, FIG. 23 is a left side view of FIG. 22, FIG.
FIG. 25 is an explanatory diagram showing a handling state of an internal pump motor by a transport trolley, and FIG. 25 is an explanatory diagram showing a state where a guide screw is driven by a guide screw driving device of a conventional device. 1 ... Reactor pressure vessel, 4 ... Internal pump, 16
…… Motor casing, 17 …… Motor, 21 …… Pedestal, 22 …… Equipment loading port, 23 …… Rotating platform, 30
…… Right screw guide screw, 30a …… Left screw guide screw, 31a …… Remover, 36 …… Transportation trolley, 40 …… Motor cask, 51 …… Drive motor, 55 …… Electric cylinder, 58 …… Guide 61 …… Movement guide, 63 …… Pulley, 65
…… Elevating table, 68 …… Chain, 77 …… Guide screw driving device, 78 …… Position adjusting device, 78,80 …… Moving table, 108
…… Gas case, 109 …… Slewing bearing with external teeth, 117,118,11
9, 120, 121, 122 ... gear, 124, 125, 126, 127 ... electromagnetic clutch, 137 ... drive motor, 147 ... wrench, 153 ... manual handle.

Claims (1)

(57) [Claims] 1. A rotary platform located below a reactor pressure vessel and driven to rotate around a vertical axis, a lifting drive provided on the rotary platform and raising and lowering a lifting platform on which an internal pump motor is mounted, A guide screw having an upper end swingably connected to a motor casing of the internal pump, a guide screw driving device for driving the guide screw, and a detachable lower end of the guide screw driving device and the guide screw. A wrench for coupling, a position adjusting device for finely adjusting the position of the guide screw driving device in the horizontal direction, a clutch mechanism for separating the wrench from the guide screw driving device and allowing manual operation, and a guide for the wrench A vertical movement mechanism that moves up and down while maintaining the interlocking relationship with the screw drive Comprising a pair of moving guides respectively arranged on both sides of the lifting platform to guide the lifting of the lifting platform, and a pair of fixed guides fixed to the rotating platform and guiding the lifting of the respective moving guides. A pair of cords, one end of which is fixed to a fixed guide and the other end of which is fixed to a lifting table via the upper end of a moving guide, and a pair of strings which are simultaneously driven by one drive motor to raise and lower each of the moving guides An internal pump motor handling device having an electric cylinder.