JPH02309298A - Handling equipment of internal pump motor - Google Patents

Abstract

PURPOSE:To perform a position adjusting operation for an elevator safely and in a short time by providing the elevator with a pair of moving guides and by providing a rotary platform with a pair of fixed guides, a pair of cord bodies one end of which is fixed to the fixed guide and the other end to the elevator and a pair of motor-operated cylinders driven by one drive motor. CONSTITUTION:A lower platform 26 is provided below a rotary platform 23 integrally therewith through pillars 26a, and a drive motor 51, a worm reduction gear 52 and two support metal fittings 53 are fitted on a fitting base 50, while the lower end parts of motor-operated cylinders 55 in a pair are supported by the support metal fittings 53 through the intermediary of pins 54. Elevation of moving guides 61 is guided by guides 58, while elevation of an elevator 65 is guided by the moving guides 61. Chain fixing metal fittings 66 are fitted on the opposite sides of the elevator 65, fixing metal fittings 67 are fitted to the guides 58, and the two motor-operated cylinders 55 are driven simultaneously by the drive motor 51. According to this constitution, a position adjusting opera tion for the elevator 65 can be performed safely and in a short time.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an internal pump motor for attaching and detaching an internal pump motor to a motor casing in a boiling water nuclear reactor in which an internal pump is biased. Related to pump motor handling equipment.

(Prior art) In conventional boiling water reactors, a jet pump is installed inside the reactor pressure vessel, and a portion of the reactor water is taken out of the reactor pressure vessel and pressurized by a recirculation pump to be used as driving water. The reactor water is sent to a jet pump, and the jet pump circulates the reactor water through the reactor core.

However, this method has problems in 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 nuclear reactor equipped with an internal pump has been developed, as shown in FIGS. 20 and 21, in order to dispose a recirculation pump inside 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 within a reactor pressure vessel 1, and a reactor core 3 is housed within this shroud 2. A plurality of internal pumps 4, for example, about 10 units, are provided around the bottom of the pump 1. Then, the reactor water in the reactor pressure vessel 1 descends in the downcomer 5 formed between the outer circumferential surface of the shroud 2 and the inner circumferential surface of the reactor pressure vessel 1, and is pumped into the reactor core by the internal pump 4. 3 and further flows into the core 3.

The reactor water that has flowed into the reactor core 3 is boiled by the heat generated by the nuclear reaction, flows upward as a two-phase flow of water and steam, and is separated into water and steam by the steam separator 6 above the core 2. It is now possible to do so. After moisture is removed from the separated steam in the steam dryer 7, it is sent to a turbine (not shown), etc., and the separated water, together with the water supplied from the water supply sparger 8, is pump 4
It is now sent to the reactor core again.

At the bottom of the reactor pressure vessel 1, as shown in FIG. ) is inserted into or withdrawn from the reactor core 3, and the half concentration of the reactor core 3 is controlled.

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

Inside the motor casing 16, as shown in FIG.
A water immersion type motor 17 is housed, and this motor 17
A motor cover 17a is attached to the lower end of the motor.

This motor cover 17a is in close contact with the lower surface of the motor casing 16, and is tightened and fixed to the motor casing 16 by a nut 19 screwed into a stud bolt 18, thereby maintaining liquid tightness and attaching the motor 17 to the motor casing 16. It is fixed at Further, the motor 17 and the impeller 12 are connected by a shaft 20, and the impeller 12 is driven via the shaft 20.

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

To disassemble and remove the internal pump 4, first disconnect the motor 17 from the shaft 20, remove the nut 19, and pull the motor 17 downward from the motor casing 16.
- This is then carried out by pulling out the impeller 12 and shaft 20 upward, and then removing the stretch tube nut 14 and removing the diffuser 11 upward. Then, the removed motor 17 passes through the inside of the cylindrical pedestal that supports the reactor pressure vessel 1, and is carried out of the pedestal through an equipment carrying-out port formed in the peripheral wall of the pedestal. Incidentally, the internal pump 4 is assembled and attached by performing the procedure in reverse order to that described above.

By the way, inside the pedestal are a control rod drive mechanism 9 protruding from the bottom of the reactor pressure vessel 1, and a neutron detector assembly (
(not shown) and a large number of piping and wiring connected thereto, there is little space available. Furthermore, 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. It is.

Conventionally, therefore, an internal pump motor handling device as shown in FIGS. 22 to 25 has been used to perform the above-mentioned work.

As shown in FIGS. 22 to 25, the conventional internal pump motor handling device is located within a cylindrical pedestal 21 that supports the reactor pressure vessel 1.
The device is provided with a rotating platform 23 corresponding to an equipment entrance 22 formed in the peripheral wall of the device. This rotating platform 23 has a roughly circular shape and is guided by a spherical rail 25 supported by the pedestal 21 via a support member 24.
It is designed to rotate around a vertical axis.

As shown in FIGS. 22 and 23, a rotating platform 23 is located below the rotating platform 23.
A lower platform 26 is provided, which is integral with the lower platform 23, 26, and a guide 27 is mounted between these two platforms 23,26. The elevating table 28 on which the motor 17 is mounted is guided by the guide 27 via guide rollers 29 for elevating and lowering.

As shown in FIGS. 22, 23, and 25, a drive device 31 that drives a right-handed guide screw 30 and a left-handed guide screw 30a is attached to the elevator 28. An attachment/detachment machine 31a for attaching and detaching the nut 19 of the motor cover 17a is placed on the upper part of the motor cover 28.

As shown in FIG. 23, the lower platform 26 includes:
Two electric hoists 32 are attached, and each of these electric hoists 23 has one end connected to the wire rope support 3 of the lifting platform 28 via a pulley 33 provided on the rotating platform 23.
The other end of the wire rope 34 connected to the wire rope 5 is wound and unwound. And as a result, the lifting platform 2
8 is designed to go up and down.

When transporting the motor 17 from inside the pedestal 21 to the inspection/repair room, a carrier 36 is used as shown in FIG.
It runs between the upper rail 37 and the pivot side rail 38.

As shown in FIG. 24, a pair of support members 39 are provided protrudingly on this transport vehicle 36, and each of these support members 39
supports the support bin 41 of the motor cask 4o,
The transport vehicle 36 is configured to rotate the motor cask 40 about the support bin 41 as an axis and to support the motor cask 40 in a horizontal state.

The motor cask 40 is in the shape of a cylindrical container with a closed upper end, and by placing the motor cask 4o over the motor 17 and attaching the lower end to the motor cutter t<-17a of the motor 17, the motor cask 40 is connected to the reactor water of the motor 17. The part that was in contact can now be completely covered.

On the other hand, at the upper end of each guide screw 30, 30a,
As shown in FIG. 25, bearings 42 are provided, connectors 43 are attached to the lower ends of each guide screw 30, 30a, and intermediate portions of each guide screw 30, 30a, Natsu 44.
45 are each screwed on.

Further, hook pieces 46 are provided on both sides of the motor casing 16, the motor 17, and the detachable device 31a, as shown in FIG.
47 and 48 are provided respectively, a bearing 42 is provided on the hook piece 46 of the motor casing 16, a nut 44 is provided on the hook piece 47 of the motor 17, and a nut 45 is provided on the hook piece 48 of the attaching/detaching device 31a. Ready to be installed. Further, the connector 43 is connected to the drive device 31.
Becomes connected to 1-swear. As a result, the guide screw 30.degree. 30a is rotationally driven by the drive device 31, and this rotational drive is converted into linear motion by the nuts 44, 45, so that the motor 17 and the attaching/detaching device 31a are moved 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.
The entire motor casing 16 can be removed from the motor casing 16.

In the above configuration, when removing the motor 17 of the internal pump 4, first rotate the rotating platform 23, position the lifting platform 28 directly below the motor 17 to be removed, and remove the lifting platform 28 from the rotating platform 23. Raise it to the top position.

Next, the guide screw 30.30a is attached to the motor casing 16, the guide screw 30.30a is rotated by the drive device 31, and the ejector 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 attachment/detachment machine 31a, and the motor 17 is removed.

Next, reversely rotate the guide screw 30.30a,
The removed motor 17 and attachment/detachment device 31a are lowered onto the lifting platform 28, and then the guide screws 30.30a are removed.

Next, the electric hoist 32 is driven to move the lifting platform 28 to the second position.
The motor 17 is lowered to the position indicated by reference numeral A in FIG.

Next, the motor cask 40 is hoisted up by the electric hoist 32a shown in FIG. 24, and the motor cask 40 is attached to the motor 17 to be integrated. And this one piece,
It is lifted up to a position where it does not interfere with the transport carriage 36, and rotated to a position where the rails 37 on the rotating platform 23 and the rails 38 on the frame side coincide.

Next, the carrier 36 is moved onto the rotating platform 23 and the motor cask 40 is lowered onto the carrier 36. After rotating and supporting the vehicle to a horizontal state, the carrier 36 is passed through the equipment entrance 22 to the pedestal 2.
1. Carry it outside.

Incidentally, when attaching the motor 17 to the motor casing 16, the procedure is reversed to that described above.

(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 lifting platform 28 up and down, and the wire rope 34 is wound up by both electric hoists 32. Due to large load fluctuations, the elevating platform 2 due to the elongation of the wire rope
There are 8 inclinations and positional fluctuations, making lifting and lowering unstable.

Further, since the speed synchronization of the two electric hoists 32 is performed using an electrical calculation method, there is a problem that synchronization may occur due to electrical failure, and the lifting platform 28 may be tilted, making the lifting operation unstable.

In addition, the rotating platform 23 and the motor casing 16
The movement of the motor 17 between the guide screw 30.
This is done by converting the rotational force of the motor 30a into the lifting force of the motor 17, but since it is structurally impossible to raise the lifting platform 28 above the top surface of the rotating platform 23, the length of the guide screw 30.308 is I have no choice but to lengthen the time.
Therefore, when the motor 17, which is a heavy object, moves up and down, vibrations occur, which is dangerous.

Further, by rotating the rotating platform 23, the drive device 31 of the guide screw 30.30a is positioned directly under the motor casing 16. After the guide screw 30.30a is connected to the drive device 31, the guide Check the verticality of the screw 30.30a, finely adjust the drive device 31 again, and tighten the guide screw 30.
It is necessary to eliminate the slope of If this work is not performed, there is a risk that the motor 17 will collide with the motor casing 16 when the motor 17 is attached to and detached from the motor casing 16.

In addition, since the conventional drive device 31 uses a chain or a belt as its power transmission means, the elongation and slack of these causes a speed difference and a phase difference between the guide screws 30.30a. There are also reports that Natsuto 44.45 gets caught.

In addition, the drive shaft of the drive device 31 and the guide screw 30.3
When coupling with 0a, since the vertical position cannot be adjusted by the drive shaft alone, it is necessary to raise and lower the entire elevator platform 28 for coupling. However, motor 1
Since a heavy object such as No. 7 is to be lifted and lowered, fine adjustment is not easy and coupling takes a lot of time.

Further, the guide screws 30, 30a are connected to the motor 17.
After it is removed from the motor casing 16 and lowered onto the lifting platform 28, it is necessary to completely remove it from the motor casing 16. Therefore, when removing the stretch tube 13 or secondary seal, use the guide screws 30 and 30.
It is necessary to attach a to the motor casing 16 again.
This work requires a lot of time. In particular, since these tasks are performed under a radiation work environment, it is necessary to complete the tasks in as short a time as possible.

The present invention has been made with these points in mind, and it is an object of the present invention to provide an internal pump motor handling device that can perform work safely and in a short time.

[Structure of the invention]

(Means for Solving the Problems) As a means for achieving the above object, the present invention provides a rotating platform located below a reactor pressure vessel and driven to rotate around a vertical axis, and an internal an elevating drive device for elevating an elevating table on which a pump motor is mounted; a guide screw whose upper end is swingably connected to a motor casing of an internal pump; a guide screw drive device for driving the guide screw; a wrench portion that removably connects a guide screw drive device and a lower end portion of the guide screw; a position adjustment device that finely adjusts the position of the guide screw drive device in a horizontal direction; A clutch mechanism that can be separated from the device to enable manual operation, and a vertical movement mechanism that moves the wrench up and down while maintaining an interlocking relationship with the guide screw drive device, and the lifting drive device is mounted on both sides of the lifting platform. a pair of moving guides arranged respectively to guide the lifting platform; a pair of fixed guides fixed to the rotating platform and guiding the lifting and lowering of each moving guide; one end fixed to the fixed guide and the other end of the moving guide. It is characterized in that it is composed of a pair of strings fixed to the lifting platform via the upper end, and a pair of electric cylinders that are simultaneously driven by one drive motor to raise and lower each of the moving guides.

(Function) In the internal pump motor handling device 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. Next, the lift table is raised by the lift drive device, and the guide screw drive device is moved in the horizontal direction by the position adjustment device to align with the guide screw. Next, the wrench part is made manually operable by the clutch mechanism, and is moved up and down by the vertical movement mechanism to connect the guide screw and the guide screw drive device via the wrench part.

Thereafter, the wrench portion is interlocked with the guide screw drive device by the clutch mechanism, and the motor is removed and lowered onto the guide screw drive device in the same manner as in the conventional method. Next, the wrench part is made manually operable by the clutch mechanism, and the wrench part is removed from the guide screw by being moved up and down by the vertical movement mechanism. after that,
The elevator platform is lowered, the rotating platform is rotated, and the motor is then carried out of the pedestal in the same manner as in the conventional method.

Incidentally, when installing the motor, perform the procedure in reverse to the above.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 19. In order to avoid duplication, the same parts as shown in FIGS. 20 to 25 are given the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 shows an example of an internal pump motor handling device according to the present invention, and in the figure, reference numeral 23 indicates a rotary drive device guided by an annular rail 25 (see FIG. 22) around a vertical axis. It is a rotating platform, and a lower platform 26 is integrally provided below the rotating platform 23 via a pillar 26a.

A mounting base 50 is integrally fixed to the lower part of the lower platform 26, as shown in FIG. 1, and a drive motor 51 is mounted on the mounting base 50, as shown in FIGS. , a worm reducer 52 and two supporting metal fittings 53 are respectively attached, and each supporting metal fitting 5
3, the lower end portions of a pair of electric cylinders 55 are supported via bins 54, respectively. Further, the drive motor 51 and the worm reducer 52 are coupled by a coupling 56 as shown in FIG. 2, and the worm reducer 52 and each motor cylinder 55 are connected as shown in FIG. They are connected by a coupling 57.

As shown in FIGS. 1 and 2, groove-shaped guides 58 are fixed to each of the six pillars 26a, and each electric cylinder 55 is supported via a pin 59 at the upper end. Metal fittings 60 are respectively attached, and a pair of movement guides 61 are fixed to each of these supporting metal fittings 60, respectively.

As shown in FIGS. 1 to 3, each of these moving guides 61 is provided with a guide groove 61a and a guide roller 62a.
It is configured to roll within the guide 58, and guide rollers 62b provided on both sides of a lifting platform 65, which will be described later, are transferred to the groove 61a. In other words, the guide 58 guides the moving guide 61 to move up and down, and the moving guide 61 guides the lifting platform 65 to move up and down.

At the upper end of each of the moving guides 61,
As shown in the figure, pulleys 63 are provided, respectively.
Further, the lower ends of both moving guides 61 are connected to each other by a connecting frame 64 in order to position the moving guide 61 in the lateral direction.

Inside both of these moving guides 61, there are
As shown in the figure, an elevating table 65 is arranged, and chain fixing fittings 66 are attached to both sides of the elevating table 65, respectively. Further, a chain fixing metal fitting 67 is attached to each of the guides 58, respectively. and,
Both ends of each chain 68, the intermediate portion of which is wound around each of the pulleys 63 from above, are connected to each of these chain fixing fittings 66, 67 via a pin.

As shown in FIG. 4, each of the guide rollers 62a and 62b includes a housing 69 that is attached to the moving guide 61 or the lifting platform 65 with bolts or the like, and a bearing guide is provided on the outer circumferential side of the housing 69. A roller 70 is inserted and is prevented from being removed using a retaining ring 71 or the like. Further, an angular bearing 72 is inserted into the inner peripheral side of the housing 69, and is prevented from being removed by a bearing support 73, which is fixed with bolts or the like.

As shown in FIG. 4, a guide rod 74 is inserted into the inner ring side of the angular bearing 72 and fixed with a bearing nut 75. The bearing guide roller 70 is configured to roll within the grooves of the guide 58 and the moving guide 61.

As shown in FIG. 4, a groove 76 is provided at the bottom of each of these grooves so that a portion outside the center of the flange of the guide rod 74 comes into contact with the groove. The guide bar 74 is for bearing a lateral load, and the guide bar 74 comes into contact with the bottom of the groove 58, 61 when a lateral load is applied. At this time, only the outer circumferential side of the guide rod 74 comes into contact with the groove 76, so that the guide rod 74 rotates and guides while in contact with it.

As shown in FIG. 1, FIG. 5, and FIG. .30a
A position adjustment device 78 is provided, which is connected to the guide screw 30, 30a and finely adjusts the verticality of the guide screw 30, 30a.

The position adjustment device 78 is provided on the upper part of the lifting platform 65 and rotates on the rotating platform 23, as shown in FIGS. 5 and 6.
a movable base 79 whose position can be adjusted in the radial direction;
The guide screw drive device 77 is attached to and detached from the upper part of the moving platform 80 via a swing bolt 81. installed as possible. This guide screw drive device 77 includes
A stand is provided 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 metal fittings 82 fixed on the lifting table 65.
A shafted roller 83 is attached to each of these supporting metal fittings 82, respectively. On the other hand, two rails 84 are manually attached to the movable table 79 side, and the shafted rollers 83 roll on each of these rails 84. Furthermore, a stopper 85 is provided at one end of each rail 84 to prevent the shafted roller 83 from falling off the rail 84 . Further, a guide roller 86 is attached to the elevating table 65 and comes into contact with the rail 84.

The movable platform 79 also has a traction fitting 8 as shown in FIG.
A nut 88 having a square column shape is fitted into the groove of the pulling fitting 87, and a threaded rod 89 is screwed into the nut 88. As shown in FIG. 10, presser fittings 90 are attached to both ends of the pulling fitting 87, respectively.

As shown in FIG. 7, the threaded rod 89 is supported by a bearing 91 attached to the lifting table 65.
A reduction gear 92 and a microphone gear box 93 are respectively attached, and the threaded rod 89 and the reduction gear 92 are connected to a coupling 94.
The reduction gear 92 and the microphone gear box 93 are connected by a coupling 95. A manual handle 96 is attached to the microphone gear box 93, and by turning the manual handle 96, a nut 88 is connected via a threaded rod 89.
moves vertically, and the movable table 79 is moved by being pulled by the traction fitting 87.

Further, the moving means of the moving table 80 is shown in FIGS. 10 to 14.
As shown in the figure, there are four supporting metal fittings 97 fixed to the lower surface of the moving table 80, and a shafted roller 98 is attached to each of these supporting metal fittings 97. On the other hand, two rails 99 are mounted in parallel on the movable table 79, and the shafted roller 98 is transferred to each of these rails 99. Further, a stopper 100° is attached to the end of each rail 99 to prevent the shafted roller 98 from falling off the rail 99.

Further, a guide roller 101 is also attached to the movable table 80 and comes into contact with a rail 99.

As shown in FIGS. 10 to 12, the moving platform 80 also includes a traction fitting 87, a nut 88 fitted to the traction fitting 87, and a threaded rod 89 screwed into the nut 88.
are provided, respectively, and presser metal fittings 90 are attached to both ends of the pulling metal fitting 87, respectively.

As shown in FIG. 12, the threaded rod 89 is supported by a bearing 102 attached to the moving table 79.
9 is provided with a reducer 103 and a shaft bearing 104, respectively, and the threaded rod 89 and the reducer 103 are connected by a coupling 105, and the reducer 103
and the shaft bearing 104 are connected by a coupling 106. A manual handle 107 is attached to the shaft bearing 104, and this manual handle 107
By turning the nut 88, the nut 88 moves linearly via the threaded rod 89, the nut 88 comes into contact with the presser fitting 90, the pulling fitting 87 is pulled, and the movable table 80 is moved. Note that both moving tables 79 and 80 may be moved by electric drive means.

The guide screw drive device 77 is shown in FIG.
As shown in FIG. 7, it is equipped with a gear case 108, and an externally toothed swing bearing 109 is installed approximately in the center of the gear case 108, as shown in FIGS. 15 to 17. As shown in FIG. 17, five bearing housings 110 are provided at the bottom. Each of these bearing housings 110 has 11
1.112 are installed respectively.

As shown in FIGS. 17 and 18, the bearing 111 is held down by a bearing holder 113, and the bearing 112 is held down by a bearing holder 114. Shafts 115 are each inserted and identified by bearing nuts 116.

Each of these shafts 115 has gears 1 in the arrangement shown in FIG.
1.7,118,119,120,121°122 is,
It is inserted and placed while being prevented from turning with a key or the like, and is further prevented from being removed by a holding plate 123 which is secured with a bolt or the like.

At the top of the gears 117, 119, 121, 122, there is a first
As shown in FIGS. 6 and 17, the electromagnetic clutch 124
, 125, 126, and 127 are each attached with a bolt or the like, and a bearing housing 1 is attached to the upper part of the gear case 108 directly above the gear 117.
29 is provided, and a bearing 130 is mounted. A housing 131 is provided in the upper part of this bearing 130, and a seal 132 is inserted therein. Also, the bearing housing 12
An electromagnetic clutch 124 is attached to the lower part of 9.

As shown in FIG. 17, a shaft 133 is attached to the bearing 1301, the seal 132, and the bearing of the electromagnetic clutch 124, and the shaft 133 is attached to the lower part of the shaft 133.
The rotating part 134 of the electromagnetic clutch 124 is taken out in a state where it is prevented from turning with a key or the like. This rotating part 13
A spline is cut on the outer periphery of the locking piece 13.
5 is engaged with this spline and is engaged with and disengaged from the locking piece 128 by the electromagnet of the electromagnetic clutch 124.

At the top of the gear case 108, as shown in FIG.
A mounting base 136 is fixedly installed, and a drive motor 137 is attached to this mounting base 136.
7 is fixed to the shaft 133 with a key or the like to prevent rotation.

As shown in FIG. 17, bearing/X housings 138 are provided in the upper part of the gear case 108 directly above the gears 119 and 121, and each of these bearing housings 13
A bearing 139 is inserted into the bearing housing 138, and electromagnetic clutches 125 and 126 are respectively attached to the lower part of the bearing housing 138.

As shown in FIG. 17, a shaft 140 is inserted through the bearing 139 and the bearings of the electromagnetic clutches 125, 126.
A locking piece 135 similar to the electromagnetic clutch 124 is provided at the bottom of the shaft 140.

As shown in FIG. 17, a bearing housing 141 is provided at the bottom of the mounting base 136. Bearings 142 and 143 are inserted into this bearing housing 141, and a shaft 144 is inserted into these bearings 142 and 143. is inserted, and its lower end is fitted onto the shaft 140 and prevented from rotating with a key or the like.

This shaft 144 has a thread cut in the upper outer cylinder part, a spline cut in the upper inner cylinder part, and a hole and a keyway into which the shaft 140 is inserted are cut in the lower inner cylinder part. .

As shown in FIG. 17, a shaft 145 is inserted into the inner cylindrical portion at the upper end of the shaft 144. The shaft 145 has a spline cut on its outer periphery and a cylindrical portion and a keyway for coupling to the upper end. Further, as shown in FIG. 17, a threaded rod 146 threaded inside the cylinder is screwed into the threaded portion of the upper outer cylinder portion of the shaft 144. As shown in FIG.

As shown in FIG. 17, the upper end of the shaft 145 has a spline or a hex wrench hole at the upper end of the inner cylinder, and a hole and keyway for coupling the shaft to the lower inner cylinder, and a keyway at the lower end. A wrench 147, each provided with a flange, is inserted and coupled with a key or the like to prevent rotation. Further, the shaft 145 and the wrench 146 are fixed with a set screw 148 to prevent the shaft 145 from falling off to the bottom.

In the upper part of the gear case 108 directly above the gear 122, there is a first
As shown in Figure 7, a housing 149 is provided and a seal 150 is inserted. An electromagnetic clutch 127 is provided at the bottom of the housing 149, and a seal 150 and a shaft 151 are provided on the shaft of the electromagnetic clutch 127, passing through them.
A clutch 124 is provided at the bottom of this shaft 151.
A locking piece 135 similar to the above is provided.

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

Next, the operation of this embodiment will be explained.

First, a method of driving the guide screw 30.30a by the guide screw driving device 77 will be explained.

First, the locking piece 128 and the locking piece 13 of the electromagnetic clutch 124
5 and electromagnetic clutches 125 and 126.
The locking piece 128 and the locking piece 135 of the electromagnetic clutch 127 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 gear 11
It will rotate in the order of 7, 118, 119, 120, 121. Then, since the electromagnetic clutches 125 and 126 above the gear 119 and the gear 121 are connected, the shaft 1
40,144 rotates. Then, the shaft 145 rotates via the spline of the inner cylinder of the shaft 144, and the wrench 147 rotates at two positions. Further, by turning the threaded rod 146, the wrench 147 is guided by the spline of the shaft 145, and can be moved up and down. Note that the rotational directions of the gears 119° and 121 are opposite to each other as shown in FIG. In this state, if only one of the electromagnetic clutches 125 and 126 is brought into a connected state, only one of the wrench 147 is driven. This is the driving method using electric drive.
.

In the case of manual drive, the electromagnetic clutch 127 is connected, the electromagnetic clutches 125 and 126 are connected, and the electric clutch 12 is connected.
Release 4. Then, by turning the manual knob 153, the gears 122, 121°, 120, 109, 119
．． It will rotate in the order of 118. Since the gear 119 and the electromagnetic clutches 125 and 126 above the gear 121 are connected, both wrenches 147 can be rotated.

In this state, if only one of the electromagnetic clutches 125, 126 is brought into a connected state, only one of the wrench 147 will be driven.

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

First, the guide screw 30 . Then, the drive motor 51 is driven to simultaneously raise both electric cylinders 55 via the coupling 56, the worm reducer 52, and the coupling 57. Then, the moving guide 61 connected to each electric cylinder 55 and the pulley 63 provided above the moving guide 61 are guided by the fixed guide 58 and move up at the same speed as the electric cylinder 55.

On the other hand, the moving end side of the chain 68 connected to the chain fixing metal fitting 66 fixed to the guide 58 and wound around the pulley 63 is connected to the lifting platform 65.
will rise at about twice the speed of the electric cylinder 55 to a certain level above the top surface of the rotating platform 23.

In this state, the manual handle 96 of the moving table 79 and the moving table 8
0 manual handle 107 to align the guide screw 30.30a and the wrench 147 of the guide screw drive device 77.

Next, the electromagnetic clutches 125 and 126 of the guide screw drive device 77 are released, and while turning the wrench 147, align the wrench 147 with the spline or hexagonal wrench hole of the connector 43, turn the threaded rod 146, and manually turn the wrench 147. By raising the wrench 14 with
7 and the connector 43 are connected. Then, the hook piece 47 of the motor 17 is attached using the nut 44.

Next, the guide screws 30.30a are rotated by the guide screw drive device 77, and the detachment/detachment device 31a is raised to the position of the motor 17 attached to the motor casing 16. Note that the rotation directions of the guide screws 30 and 30a are opposite to each other.
The rotation of 0.30a prevents rotation in the same direction when the attachment/detachment machine 31a or the motor 17 is raised.

The nut 19 is removed by the detacher 31a, and the motor 17 is removed.
After removing the guide screw 30° 30a, the removed motor 17 and detacher 31a are lowered to above the guide screw drive device 77. 19th
The figure shows this situation.

Next, turn the threaded rod 146, lower the threaded rod 146, release the electromagnetic clutches 125 and 126, and release the wrench 14.
7 and the connector 43 is released. As a result, the connection between the wrench 147 and the connector 43 is released.

Next, remove the nut 44 from the hook piece 47,
Remove the nut 45 from the hook piece 48, and insert the guide screw 30.30a with reference symbol M in FIG.

In the state shown by N, the lifting platform 65 is lowered, the rotating platform 23 is rotated, and the motor 17 is moved to the equipment entrance 2.
Move it to the position corresponding to 2.

Next, the motor cask 4 is lifted by the electric hoist 32a.
0 is lifted up, suspended onto the motor 17, and attached to the motor 17. Then, the motor 17 integrated with the motor cask 40 is lifted to a position where it does not interfere with the transport vehicle 35,
The rotating platform 23 is rotated so that the rail 37 on the rotating platform 23 and the rail 38 on the frame side are aligned.

Next, the carrier 36 is carried in, the motor cask 40 is suspended onto the carrier 36 and laid down horizontally, and the carrier 36 is moved to be carried out of the pedestal 21 through the equipment entrance 22.

Incidentally, when installing the motor 17, the procedure described above is reversed.

In this way, one drive electric motor 51 drives two electric cylinders 55 at the same time to drive the lifting platform 65 up and down, so the load is lower than the conventional method of winding the lifting platform with a wire rope. The rigidity against fluctuations is high, and the positional fluctuation and inclination of the lifting platform 65 are eliminated. Further, there is no inclination of the lifting platform 65 due to synchronization deviation due to electrical failure.

Further, as an elevating device for the elevating table 65, a pair of fixed guides 58, a pair of moving guides 61 that move up and down along the guides 58, and an elevating table 65 and the guide 58 that move up and down along the moving guides 61. Since a mechanism including a chain 68 connecting the two is used, the lifting platform 65 can be raised and lowered with a stroke twice as long as that of the moving guide 61.

Therefore, a large stroke of the lifting platform 65 can be obtained with a short drive stroke, and the lifting platform 65 can be raised to a position above the upper surface of the rotating platform 23. Therefore, the guide screws 30.30a can be shortened and vibrations can be reduced.

Furthermore, since a position adjustment device 78 is provided at the top of the lifting table 65, the guide screw drive device 77 can be moved in the horizontal direction to finely adjust its position, thereby eliminating the inclination of the guide screws 30, 30a. Therefore, the motor casing 1'6 does not collide with the motor 17 and get caught.

Furthermore, when connecting the wrench 147 of the guide screw drive device 77 to the guide screw 30.30a, the wrench 147 can be moved up and down independently, so it can be connected to the guide screws 30.30a one by one, which saves work time. It can be significantly shortened.

Furthermore, the guide screws 30, 30a can be swung outward using the connection portion to the motor casing 16 as a fulcrum, and the coupling between the guide screws 30, 30a and the guide screw drive device 77 is released. This is done by lowering and rotating the wrench 147, so the guide screw 30.
There is no need to remove a from the motor casing 16. Therefore, a great deal of time can be saved in a radiation work environment.

〔Effect of the invention〕

As explained above, according to the present invention, the handling work of the internal pump motor can be done safely and conveniently, and the working time in a radiation environment can be significantly shortened.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an internal pump motor handling device according to an embodiment of the present invention, FIG. 2 is a plan view showing the driving device portion of the lifting platform shown in FIG. 1, and FIG. 3 is a diagram similar to that shown in FIG. 1. 4 is a detailed cross-sectional view showing the guide roller portion that guides the lifting platform up and down, FIG. 5 is a front view showing the position adjustment device, FIG. 6 is a left side view of FIG. 5, and FIG. The figure is a block diagram of the driving means of the moving platform that adjusts the position of the rotating platform in the radial direction.
0 and 11 are main part configuration diagrams of FIGS. 7 and 12, FIG. 12 is a configuration diagram of a driving means for a movable platform that adjusts the position of the rotating platform in the circumferential direction, and FIGS. 13 and 14. 12 is a diagram showing the main part configuration, FIG. 15 is a schematic diagram showing the gear train configuration of the guide screw drive device, FIG. 16 is a bottom view thereof, and FIG. 17 is a diagram showing the line X--X in FIG. 15. 18 is an enlarged sectional view taken along the line X■-X■ of FIG. 15,
Fig. 19 is an explanatory diagram showing the guide screw being driven to the guide screw drive device, Fig. 20 is a sectional view showing a nuclear reactor equipped with an internal pump, and Fig. 21 shows the configuration of the internal pump. 22 is a configuration diagram showing a conventional internal pump motor handling device, FIG. 23 is a left side view of FIG. 22, and FIG. 24 is an explanatory diagram showing how the internal pump motor is handled by a transport vehicle. , FIG. 25 is an explanatory view showing a state in which a guide screw is being driven by a guide screw drive device of a conventional device. DESCRIPTION OF SYMBOLS 1... Reactor pressure vessel, 4... Internal pump, 16... Motor casing, 17... Motor, 2
1...Pedestal, 22...Equipment entrance, 23...
・Rotating platform, 30... Right-hand thread guide screw, 30a... Left-hand thread guide screw, 31a.
... Detachment machine, 36... Transport vehicle, 40... Motor cask, 51... Drive electric motor, 55... Electric cylinder, 58... Guide, 61... Movement guide, 63...
・Pulley, 65... Lifting platform, 68... Chain, 77
...Guide screw drive device, 78...Position adjustment device, 78.80...Moving table, 108...Gear case, 109...Swivel bearing with external teeth, 117,118,1
19,120°121.122...Gear, 124,1
25,126°127...Electromagnetic clutch, 137...
- Drive motor, 147... Wrench, 153... Manual handle. Applicant's representative Sato - Male leather 1 Figure 3 Potato 32 Tea 4 Figure 6th $ 7 Figure 1 Or2r $ 012 $lz Figure $f 3 $ 14 Tea 76th $ 19 - $20G $222

Claims (1)

[Claims] A rotating platform located below the reactor pressure vessel and driven to rotate around a vertical axis, a lifting drive device installed on this rotating platform that lifts and lowers a lifting platform equipped with an internal pump motor, and an internal pump motor at the upper end. A guide screw that is swingably connected to a motor casing of a pump, a guide screw drive device that drives the guide screw, and a wrench portion that detachably connects the guide screw drive device and the lower end of the guide screw. , a position adjustment device that finely adjusts the position of the guide screw drive device in the horizontal direction; a clutch mechanism that separates the wrench portion from the guide screw drive device to enable manual operation; and an interlocking mechanism of the wrench portion with the guide screw drive device. and a vertical movement mechanism that moves up and down while maintaining the relationship, and the elevating drive device includes a pair of moving guides that are arranged on both sides of the elevating table and guide the elevating and lowering of the elevating table, and a pair of moving guides that are fixed to the rotating platform and move the respective A pair of fixed guides that guide the movement up and down of the moving guide, a pair of strings that have one end fixed to the fixed guide and the other end fixed to the lifting platform via the upper end of the moving guide, and one driving electric motor. An internal pump motor handling device comprising a pair of electric cylinders that are simultaneously driven to raise and lower each of the moving guides.