JP6533499B2 - Transport carriage and lifting jig for internal pump motor - Google Patents

Description

  The present invention relates to a carriage for an internal pump motor and a lifting jig.

  In the improved boiling water reactor plant (hereinafter referred to as ABWR), a plurality of internal pumps (reactor recirculation pumps), for example, 10 units, are used. The internal pump is installed in an internal pump motor casing which is a part of the reactor pressure vessel. The internal pump motor provided in the internal pump is removed for inspection at the time of periodic inspection of the plant.

  At that time, the internal pump motor is removed from the internal pump motor casing using a lifting device. Then, the removed internal pump motor is housed in an internal pump motor container (hereinafter simply referred to as a container). The container in which the internal pump motor is stored is lifted by an electric chain block or the like, mounted on the transport carriage, and carried out to the repair room by the transport carriage.

  The discharge passage leading to the repair room has a small cross-sectional area (passage area) in consideration of the radiation region. For this reason, at the time of unloading, it is necessary to make the container lie sideways and pass the unloading passage. In the overturning operation of the container, the lifting operation of the electric chain block and the moving operation of the transport carriage are performed in cooperation with each other.

  By the way, what was described in patent documents 1 and 2 is known as a conveyance truck of an internal pump motor which can lay over a container without using such an electric chain block.

JP-A-11-218595 JP-A-5-188182

  However, in the carriage for the internal pump motor described in Patent Documents 1 and 2, the internal pump motor is once housed in the container and then mounted on the carriage. For this reason, it took a long time for storage work. Generally, the work of mounting the internal pump motor on the transport carriage and the work of unloading the internal pump motor from the transport carriage are carried out in a work environment where it is easy for workers to be exposed. For this reason, it is desirable to finish the mounting operation and the like in a relatively short time.

  Then, this invention is providing the conveyance trolley and the hanging jig of the internal pump motor which can perform the mounting operation | work and loading / unloading operation of an internal pump motor in a short time.

  The carriage of the internal pump motor according to the present invention is pivotally supported by the carriage base, a support provided on the carriage base, and the support via a support shaft, and the internal pump motor is mounted A pedestal and a speed reduction mechanism for reducing the rocking speed of the pedestal, wherein the pedestal takes a posture in which the internal pump motor is placed vertically by the weight of the internal pump motor It is characterized in that it is rockable and its rocking speed is reduced by the reduction mechanism.

  Further, the hanging jig according to the present invention is a hanging jig for delivering the internal pump motor with the transport carriage, and a mounting portion attached to an upper end portion of the internal pump motor, and the mounting portion A hanging ear portion to which a lifting gear provided to the lifting apparatus is attached, and the mount base provided to the mounting portion and the pedestal swings to a posture in which the internal pump motor is placed horizontally And a supporting portion that abuts and supports the load of the internal pump motor.

  According to the present invention, it is possible to obtain the carriage and the lifting jig of the internal pump motor capable of performing the mounting operation and the loading and unloading operation of the internal pump motor in a short time.

It is the schematic which shows the internal structure of the building where the conveyance trolley of the internal pump motor which concerns on one Embodiment of this invention is applied. It is a figure which shows a conveyance trolley, (a) is a front view, (b) is a side view. It is a figure which shows a deceleration mechanism, (a) is sectional drawing which shows the mode of a spiral spring, (b) is a longitudinal cross-sectional view of a support | pillar, (c) is sectional drawing which shows the state which the spiral spring expanded. It is a figure which shows a suspension jig, (a) is a top view, (b) is a front view, (c) is a top view corresponding to a side view, (d) is a side view. It is operation | movement explanatory drawing at the time of removing an internal pump motor. It is operation | movement explanatory drawing at the time of removing an internal pump motor. It is operation | movement explanatory drawing at the time of removing an internal pump motor. It is operation | movement explanatory drawing at the time of removing an internal pump motor. It is operation | movement explanatory drawing at the time of removing an internal pump motor.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a conveyance carriage and a hanging jig of an internal pump motor according to the present invention will be described with reference to the drawings.

First, the internal structure of the building 1 to which the transfer carriage 10 of the internal pump motor 6 is applied will be described with reference to FIG.
In the building 1, a reactor pressure vessel 2, a turntable 3, an unloading passage 3 </ b> R, a repair room 4, and a transport carriage 10 are provided. Further, the mounting operation and the unloading operation of the internal pump motor 6 on the transport carriage 10 are performed using the lifting jig 20.

  Below the reactor pressure vessel 2, an internal pump 5 is installed. A plurality of internal pumps 5 are provided at predetermined intervals in the circumferential direction of the reactor pressure vessel 2 (not shown). Water in the reactor pressure vessel 2 is forcedly circulated by the internal pump 5 to cool the core (not shown).

  The internal pump 5 includes an internal pump motor 6 housed in a casing. The internal pump 5 is removed from the casing of the internal pump 5 at the time of periodic inspection of the plant, mounted on the transport carriage 10, transported to the repair room 4 through the unloading passage 3R.

  The turntable 3 is installed below the reactor pressure vessel 2. The turntable 3 is rotatable in the circumferential direction by wheels 3e provided at the lower part. A lifting device 3 a is installed on the turntable 3. The lifting device 3 a is used when removing the internal pump motor 6 from the internal pump 5 and when attaching the internal pump motor 6 to the internal pump 5. The lifting device 3 a can be disposed in a state of projecting on the turntable 3 through an opening 3 b provided in the turntable 3 and can be disposed in a state of being sunk inside the turntable 3.

  When the internal pump motor 6 is attached and removed, the lifting device 3 a is arranged to protrude above the turntable 3. In this state, as shown in FIG. 5, the guide screws 3c and 3c are attached to the lifting device 3a. The removed internal pump motor 6 is placed on the top of the lifting device 3a. Similarly, the internal pump motor 6 after repair is placed on the top of the lifting device 3a. The internal pump motor 6 is positioned and mounted on the top of the lifting device 3a via an engagement means (not shown).

  In addition, when the turntable 3 is turned, the lifting device 3a can be disposed so as to sink in the turntable 3 along the guide members 3d, 3d. As described above, by arranging the lifting device 3a in a state of being sunk in the turntable 3, the amount of protrusion of the internal pump motor 6 mounted on the lifting device 3a can be reduced. Thereby, the turntable 3 can be rotated while avoiding interference with other peripheral devices (not shown) and the like.

  A rail R1 is laid on the turntable 3 as shown in FIG. The rail R1 is connectable to the rail R2 provided in the unloading passage 3R and the repair room 4. Thus, the transport carriage 10 can enter the turntable 3 through the rails R2 and R1.

  In addition, an electric chain block 7 is installed above the turntable 3. The electric chain block 7 is used when carrying out an installation operation or an unloading operation of the internal pump motor 6 with the transport carriage 10. As shown in FIG. 6, the hanging jig 20 is suspended from the hook portion 7a of the electric chain block 7 via the sling 7b.

  The discharge passage 3R communicates the place where the turntable 3 is installed with the repair room 4. The discharge passage 3R is set to have a small cross-sectional area (passage area) in consideration of the radiation region. In addition, piping which is not illustrated is installed in the upper part of the carry-out passage 3R. Therefore, it is necessary to carry out the internal pump motor 6 mounted on the transport carriage 10 passing through the carry-out passage 3R in a horizontally placed posture (a posture in which the axial direction is substantially horizontal) (FIG. 2 (b)) reference).

The transport carriage 10 can enter the repair room 4 through the rail R2. An electric chain block 4 a is installed in the upper part of the repair room 4. The electric chain block 4 a is used when carrying out an installation operation or an unloading operation of the internal pump motor 6.
In the repair room 4, an internal pump motor 6 (not shown) before repair, an internal pump motor 6 (not shown) after repair, a hanging jig 20 and the like are placed.

Next, the transport carriage 10 will be described.
As shown in FIG. 2, the transport carriage 10 includes a carriage base 11, columns 12 and 12, a pedestal 14, and a speed reduction mechanism 15.
The carriage base 11 has a substantially frame shape. As shown by a two-dot chain line in FIG. 2B, the pedestal 14 in the vertically placed posture is positioned on the inner side (frame-shaped inner side) of the carriage base 11. In the side portion of the carriage base 11, a fixing hole 11a for fixing the pedestal 14 in the vertical orientation is formed. The fixing rod 11b is inserted into the fixing hole 11a. A wheel 11 c is provided at the lower part of the carriage base 11.

The columns 12 are erected on the carriage base 11. The columns 12, 12 pivotally support the pedestal 14 via the support shafts 13, 13. A speed reducing mechanism 15 is provided on the columns 12 and 12.
As shown in FIGS. 3A and 3B, the reduction mechanism 15 has a cylindrical portion 15a and a ring supported in the cylindrical portion 15a via a bearing (for example, a bearing member) 15b (see FIG. 3B). And a spring support 15d. The cylindrical portion 15 a is fixed to the support 12.

  The support shaft 13 is inserted into and supported by the ring-shaped support portion 15c. As shown in FIG. 3B, the spiral spring 15d is accommodated in an annular space 15e surrounded by the cylindrical portion 15a, the ring-shaped support 15c, and the bearing 15b. As shown to Fig.3 (a), one end 15d1 of the spiral spring 15d is being fixed to the inner surface of the cylindrical part 15a used as the support | pillar 12 side. On the other hand, the other end 15d2 of the spiral spring 15d is fixed to the outer surface of the ring-shaped support 15c on the side of the base 14 (the side of the support shaft 13).

  The state of the spring-loaded spring 15d shown in FIG. 3A shows the state where the pedestal 14 is in the vertically placed posture, and the ring-shaped support portion 15c is in the arrow X1 direction in the figure while receiving the biasing force of the spring-loaded spring 15d. It is rockable. That is, when the base 14 swings from the vertically placed posture to the horizontally placed posture, the swinging speed is reduced by the biasing force of the spiral spring 15 d. In the present embodiment, the pedestal 14 is swung from the vertically placed posture to the horizontally placed posture by the weight of the internal pump motor 6 (using its own weight), and at that time, the rocking speed is reduced. Thus, the pedestal 14 is configured to swing at a suitable swing speed that is smooth and small in impact.

  The swing amount of the base 14 is set by the extension of the spring 15d, and the swing speed of the base 14 is set by the spring constant of the spring 15d. In the present embodiment, the spiral spring 15d is set to extend in a state where the pedestal 14 is swung to the horizontal installation posture. The state shown in FIG. 3C is the state in which the spiral spring 15d is extended.

The hanging jig 20 (see FIG. 1) is a jig used when delivering the internal pump motor 6 with the transport carriage 10. The hanging jig 20 is provided with the attaching part 21, the hanging ear part 22, and the support part 23, as shown to each figure in FIG.
The mounting portion 21 is formed of an annular plate material. The mounting portion 21 is mounted so as to accommodate the circular upper end 6 b of the internal pump motor 6 inside the inner surface 21 a. A fixing bolt not shown is used for the attachment.

  The hanging ear portion 22 is provided on the upper surface of the mounting portion 21 so as to project upward. A connecting tool (not shown) for attaching the sling 7b (see FIG. 6) is attached to the hanging ear portion 22. The support portion 23 is provided on the outer surface of the attachment portion 21 so as to protrude laterally. The support portion 23 is formed between the frame members on the upper surface of the carriage base 11 when the base 14 is swung to a posture in which the internal pump motor 6 is placed horizontally (see FIGS. 2A and 2B). Contact with the internal plane), and serves to support the load of the internal pump motor 6. Thereby, the internal pump motor 6 (the pedestal 14) is held horizontally.

Next, the removal work procedure of the internal pump motor 6 at the time of periodic inspection of the plant will be described.
At the time of periodic inspection, first, as shown in FIG. 5, the guide screws 3c, 3c are connected to the bracket 5a of the casing of the internal pump 5, the bracket 6a of the internal pump motor 6, and the lifting device 3a. Then, the guide screws 3c, 3c are rotated by the lifting device 3a to lower the internal pump motor 6. Then, the internal pump motor 6 is placed on the lifting device 3a. Thereafter, the guide screws 3c, 3c are removed.

  Thereafter, as shown in FIG. 6, the transport carriage 10 is moved from the repair room 4 to the lower part of the electric chain block 7 through the carry-out passage 3R, and the lifting jig 20 is carried in. Then, the sling 7 b is hooked on the hook portion 7 a of the electric chain block 7, and the lifting jig 20 is lifted.

Thereafter, as shown in FIG. 7, the lifting device 3 a is lowered and the turntable 3 is rotated to arrange the internal pump motor 6 below the lifting jig 20. Then, the electric chain block 7 is operated to lower the lifting jig 20 and attach it to the internal pump motor 6.
Next, the electric chain block 7 is operated to lift the internal pump motor 6 through the lifting jig 20.

Thereafter, as shown in FIG. 8, the transport carriage 10 is moved to the lower side of the lifted internal pump motor 6. At this time, using the fixing rod 11b (see FIG. 2B), the base 14 is fixed to the carriage base 11 so as not to swing.
The electric chain block 7 is operated to mount the internal pump motor 6 together with the lifting jig 20 on the pedestal 14. Then, the internal pump motor 6 is fixed to the pedestal 14. Then, the connecting tool (not shown) is removed from the lifting jig 20 and the sling 7b is removed.

  Thereafter, the fixing rod 11b (see FIG. 2B) is removed, and as shown in FIG. 9, the pedestal 14 is swung from the vertically placed posture to the horizontally placed posture using the weight of the internal pump motor 6 Do. At this time, the base 14 is rotated at a suitable speed (at a relatively slow speed) by the speed reduction mechanism 15. When the pedestal 14 is in the horizontal orientation, the support portions 23 and 23 of the lifting jig 20 abut the upper surface of the carriage base 11 (see FIG. 2B), and the internal pump motor 6 (the pedestal 14) is in the lateral orientation Is held by.

Thereafter, the transport carriage 10 is transported to the repair room 4 through the unloading passage 3R. In the repair room 4, attach a sling 7b (not shown) to the lifting jig 20 via a connector, swing the pedestal 14 from the horizontal installation posture to the vertical installation posture with the electric chain block 4a, and use the fixing rod 11b The base 14 is fixed so as not to swing.
Thereafter, a sling 7b (not shown) is attached to the lifting jig 20 via a connector, and the internal pump motor 6 is not fixed to the pedestal 14, and the electric chain block 4a Load the null pump motor 6. Then, the internal pump motor 6 loaded and unloaded is checked and repaired in the repair room 4.

  In addition, attachment of the repaired internal pump motor 6 can be performed in the procedure contrary to the procedure demonstrated by the said removal procedure.

  According to the transport carriage 10 of the internal pump motor 6 of the present embodiment described above, the posture of the internal pump motor 6 (the posture of the pedestal 14) on the carriage can be determined by swinging the pedestal 14 of the transport carriage 10 It can be easily changed. That is, the internal pump motor 6 (pedestal 14) can be easily changed from the vertically placed posture to the horizontally placed posture without using a conventionally used container. Therefore, the loading and unloading operations of the internal pump motor 6 can be performed in a short time.

  Further, since the posture can be changed by swinging the pedestal 14 using the weight of the internal pump motor 6, the driving force can not be required to change the posture, and the operation can be suitably performed manually.

  Further, since the rocking speed of the pedestal 14 is reduced by the speed reduction mechanism 15, the internal pump motor 6 having a heavy weight can be changed to the horizontal installation posture at the decelerated desired rocking speed. Therefore, the conveyance operation of the internal pump motor 6 can be smoothly performed.

  Since the internal pump motor 6 can be directly delivered to and from the transport carriage 10 using the lifting jig 20, the mounting operation of the internal pump motor 6 can be performed smoothly.

The swing amount of the base 14 is set by the extension of the spring spring 15d, and the swing speed of the base 14 is set by the spring constant of the spring spring 15d. By changing these, it is preferable to meet the specifications of the plant. The transport carriage 10 can be made.
Moreover, the change of setting is relatively easy, and the cost can be reduced.

As mentioned above, although embodiment of this invention was described, this invention can be suitably changed in the range which does not deviate from the meaning, without being limited to the said embodiment.
For example, the base 14 may be of any type as long as the attitude can be changed by mounting the internal pump motor 6, and various types can be adopted.

  Moreover, although the attachment part 21 showed the cyclic | annular thing in the hanging jig 20, it is not restricted to this, The thing of various shapes, such as what was formed in rectangular shape, is employable.

5 internal pump 6 internal pump motor 10 transport carriage 11 carriage base 12 post 13 support shaft 14 pedestal 15 reduction mechanism 15 d spring spring 15 d one end 15 d 2 other end 20 suspension jig 21 attachment portion 22 suspension ear portion 23 support portion

Claims (3)

A carriage base, a support provided on the carriage base, and a pedestal supported so as to be able to pivot on the support via a support shaft to reduce an oscillating speed of the pedestal on which the internal pump motor is mounted And a speed reduction mechanism,
The pedestal can be rocked from the position in which the internal pump motor is vertically mounted to the posture in which the internal pump motor is horizontally mounted by the weight of the internal pump motor, and the rocking speed is reduced by the reduction mechanism. A carrier for an internal pump motor, characterized by:   The speed reduction mechanism includes a spiral spring having one end connected to the support and the other end connected to the support shaft, and the swing amount of the pedestal is set by the expansion of the spiral spring, and the spiral spring The carriage for the internal pump motor according to claim 1, wherein a swing speed of the pedestal is set by a spring constant of a spring. A lifting jig for delivering the internal pump motor to and from the transport carriage according to claim 1;
An attaching portion attached to an upper end portion of the internal pump motor;
A hook that is provided on the mounting portion and to which a hanger provided on the lifting device is attached;
A support portion provided in the mounting portion, the support portion supporting the load of the internal pump motor in contact with the base of the carriage when the pedestal swings to a posture in which the internal pump motor is placed horizontally;
A hanging jig characterized by comprising.

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