JPH0672944B2 - Gripper for fuel handling machine of fast breeder reactor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gripper for a fuel handling machine of a fast breeder reactor.

[Conventional technology]

In a fast breeder reactor, particularly when handling a spent fuel assembly having a high decay heat level, the fuel assembly may be accommodated in a fuel transfer pot containing a coolant such as sodium.

Conventionally, as a gripper of a fuel handling machine that handles the above-mentioned fuel assemblies, for example, Japanese Patent Publication No.
There is known a gripper for fuel entry / exit machine described in Japanese Patent No. 32153.

As shown in FIG. 3, this gripper has two sets of drums that are individually rotated by a pair of hanging tapes 1a, 1b, 2a, 2b.
A gripper upper base body 7 in which 3, 4 are mounted in a casing 5 and an intermediate connecting claw 6 is projected to the outer periphery at a lower end portion of the casing 5, and a tip end is a handling head for an object to be handled.
Claw holders 9a and 9b that are shaped to fit the 8a and 8b dimensions
gripper tip bodies 11a and 11b, which are provided with a and 10b and are suspended and coupled to the gripper upper base body 7 by the intermediate coupling claws 6,
The crank arms 12 and 13 are respectively attached to the drums 3 and 4 of the two sets.
The intermediate connecting claw operating actuator 14 or claw operating actuator 15 connected by means of the lifting tape 1a, 1b, 2a, 2b operation of the gripper up, down, coupling with the object to be handled, disconnection, and the upper substrate 7 and tip body 11a,
It connects and disconnects with 11b.

[Problems to be solved by the invention]

However, the above-mentioned conventional gripper has the following problems.

(1) Since it takes time to replace the gripper tip bodies 11a and 11b, when the fuel assemblies and the fuel transfer pots are handled alternately, the fuel exchange time may be extended, which may lead to a decrease in plant operating rate. .

(2) One of the separated tip bodies 11a, 11b
Since the coolant adhering to the hardener hardens, smooth operation may become difficult.

(3) Either one of the gripper tip end bodies 11a and 11b needs to be temporarily placed, which increases the accommodation space of the fuel handling machine.

Therefore, the present invention is intended to provide a gripper for a fuel handling machine of a fast breeder reactor, which enables reduction of refueling time, smooth operation, and reduction of an accommodation space of the fuel handling machine.

[Means for solving problems]

In order to solve the above problems, the present invention provides a fuel assembly,
In a gripper for a fuel handling machine of a fast breeder reactor, which alternately handles fuel transfer pots for accommodating and transferring the fuel assembly, the main body casing and the gripper provided for insertion into the handling head of the fuel transfer pot are provided. A pot insertion casing that is continuously provided at a lower portion, and an assembly insertion casing that is provided so as to be insertable into a handling head of the fuel assembly and that is continuously provided at a lower portion of the pot insertion casing,
A bell-crank-shaped pot claw that is pivotally attached to the inside of the lower portion of the main body casing and has a lower end hook portion that can project to the outside of the upper portion of the pot insertion casing, and the lower end hook portion that is pivotally attached to the inside of the lower portion of the pot insertion casing. A bell crank-shaped claw for assembly provided so as to be able to project to the outside of the assembly insertion casing, a pot crank arm provided with a ring-shaped actuator for swinging the pot claw at the lower end, and moving inside the actuator A crank arm for an assembly having an actuator that is inserted as much as possible and that swings the assembly claw at the lower end.

[Action]

According to the above means, opening and closing of the pot claw and the assembly claw are separately performed by raising and lowering each actuator.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 21 in the figure denotes a cylindrical main body casing.
At the bottom of the
(Refer to FIG. 2) A cylindrical pot insertion casing 23 that can be inserted therein is continuously provided.
A cylindrical assembly insertion casing 25 that can be inserted into the handling head 24 of the fuel assembly is connected to the lower portion of 23.

Inside the lower portion of the main body casing 21, a plurality of bell crank-shaped pot claws 26 (only one is shown in the figure) are pivotally mounted via horizontal pins 27 so as to be swingable. The lower end hook portion 26a is provided so as to project outward from a notch 28 provided in the upper portion of the pot insertion casing 23. Inside the lower portion of the pot insertion casing 23, a plurality of bell crank-shaped (only one in the figure is shown) assembly claws 29 are pivotally mounted via horizontal pins 30. The lower end hook portion 29a of the assembly claw 29 is provided so as to be able to project to the outside from a notch 31 provided in the peripheral wall of the assembly insertion casing 25.

At the lower end of the pot crank arm 32, the pot claw 26
A ring-shaped actuator 33 that swings (opens and closes) is fixed. A rod-shaped assembly crank arm 34 is movably inserted into the pot crank arm 32 and the actuator 33, and an assembly claw 29 is swung (opened and closed) at the lower end of the crank arm 34. The spindle-shaped actuator 35 is fixed.

When a bare fuel assembly is handled by the gripper having the above structure, as shown in FIG. 1, a crank arm for the assembly is used.
The actuator 35 is moved up and down, the actuator 35 is used to open and close the assembly claw 29, and the fuel assembly is gripped or released. When handling the fuel assembly in the fuel transfer pot, the pot crank arm 33 is set to the raised position and the pot claw 26 is moved to the first position.
The claw 29 for an assembly is opened and closed in the closed state shown in the figure.

On the other hand, when handling a fuel transfer pot containing a fuel assembly, as shown in FIG. 2, the assembly claw 29 is closed and the pot crank arm 32 is moved up and down, and the actuator 33 causes the pot claw 26 to move. To open or close to grip or release the fuel transfer pot.

In the above embodiment, the crank arm for the pot
Although the pipe 32 has a pipe shape, it is not limited to this and may have a rod shape and be connected to the ring actuator 33.

In addition, as shown in FIG. 3, the actuators 33 and 35 can be lifted and lowered.
In addition to the method of using two sets of drums which are individually rotated by a pair of hanging tapes, two sets of drums above the gripper, which are directly connected to the crank crank arm 32 for the pot and the crank arm 34 for the assembly, respectively, are independently connected. Alternatively, a driving device (not shown) may be used.

〔The invention's effect〕

As described above, according to the present invention, the opening and closing of the pot claws and the assembly claws are separately performed by raising and lowering each actuator, so that it is not necessary to replace the gripper tip body as in the conventional case, and the fuel The replacement time can be greatly reduced,
Smooth operation can be performed, the plant operating rate can be greatly improved, and the accommodation space of the fuel handling machine can be reduced.

[Brief description of drawings]

FIG. 1 and FIG. 2 are vertical cross-sectional views of a main part of a gripper for a fuel handling machine of a fast breeder reactor in an opened state of an assembly claw and a pot opened state, respectively. FIG. 3 is a vertical sectional view of a conventional gripper. 21 …… Main body casing 22 …… Handling head 23 …… Pot insert casing 24 …… Handling head 25 …… Assembly insert casing, 26 …… Pot claw 26a …… Bottom hook part, 29 …… Assembly claw 29a ...... Lower end hook part 32 …… Pot crank arm 33 …… Actuator 34 …… Assembly crank arm 35 …… Actuator

Claims (1)

[Claims] 1. A gripper for a fuel handling machine of a fast breeder reactor, which alternately handles a fuel assembly and a fuel transfer pot for housing and transferring the fuel assembly.
A pot insertion casing that is provided so that it can be inserted into the handling head of the fuel transfer pot and that is provided continuously to the lower portion of the main body casing, and that that is provided so that it can be inserted into the handling head of the fuel assembly and that is provided continuously to the lower portion of the pot insertion casing. A bell-crank-shaped pot claw that is pivotally attached to the inside of the assembly insertion casing and the inside of the lower portion of the main body casing, and has a lower end hook portion that can project to the outside of the upper portion of the pot insertion casing, and is pivotally attached to the inside of the lower portion of the pot insertion casing. And a bell crank-shaped assembly claw provided with a lower end hook portion capable of projecting to the outside of the assembly insertion casing, and a pot crank arm provided with a ring-shaped actuator that swings the pot claw at the lower end portion. , For an assembly having an actuator that movably inserts in the actuator and swings an assembly claw at the lower end Fuel handling machine for the gripper of the fast breeder reactor consisting of a rank arm.