JPH0646232B2 - Stand up device for fuel assembly assembly stand - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for erecting an assembly platform of a nuclear fuel assembly for a nuclear reactor.

“Prior Art” A nuclear fuel assembly for a nuclear reactor is a long one, and is generally assembled on a horizontal assembly table and then erected together with the assembly table so that it can be easily lifted before being transferred to the next step.

In this case, in the conventional case, as shown in FIG. 6, the hook 3 of the overhead crane is attached to the tip end side of the fuel assembly assembly base 2 whose base end side is supported by the turning shaft 1 and is rotatably provided in the vertical direction. A cylinder 4 having a base end connected to the floor side and a tip connected to the assembly base 2 is arranged below the assembly base 2 as shown by a chain double-dashed line. It was made to stand by extending.

[Problems to be Solved by the Invention] However, in each of the above-described structures, a large moment is required around the rotating shaft 1 of the assembly table 2, so a large amount of power is required to stand up, and a large crane or a powerful cylinder is required. Then, there was a problem that equipment cost was required.

Further, in the above structure, since the operation amount of the crane and the cylinder 4 is directly reflected on the rotation amount of the assembly table 2, it is difficult to slowly rotate the assembly table 2 immediately after the start of standing up or immediately before the completion of standing up. For this reason, there is a drawback that the worker does not have enough room for safety confirmation at the time of starting / stopping, and that the shock to the fuel assembly and the entire device is large.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and includes a rotating shaft that supports the vicinity of the center of gravity of a fuel assembly assembly in a vertically rotatable manner, and a length of the assembly assembly. The guide part provided on the assembly table in the direction and one end is slidably and rotatably connected along the guide part, and the other end is positioned substantially vertically downward while the assembly table is horizontal. An arm rotatably supported by a fixed shaft is provided, and a drive means for tilting the arm from a position where the assembly base is horizontal to a position where the assembly stand is upright.

[Operation] In this standing device, since the vicinity of the center of gravity of the assembly table is supported by the rotation shaft, the moment about the rotation axis of the assembly table is small and the drive means can be small. In addition, the assembly stand in the horizontal state is started up very gently, then gradually accelerated and decelerated, and then upright and stopped again at an extremely slow speed, which is sufficient for safety confirmation at the start and stop of standing. And the shock given to the fuel assembly is small.

"Embodiment" FIG. 1 is a front view showing an embodiment of a standing device for a fuel assembly assembly stand according to the present invention.

Reference numeral 10 in the figure denotes a fuel assembly assembly table, and this assembly table 1
The support grid fixing frame 11 ... And the lower nozzle fixing frame 12 are attached to the upper surface of 0 so that the upper side of the fuel assembly (not shown) is fixed on the left side of the drawing and the lower side of the fuel assembly is fixed on the right side of the drawing. It has become.

As shown in FIG. 2, a shaft mounting member 13 is fixed to a central portion in the longitudinal direction of the assembly table 10 in a direction orthogonal to the assembly table 10. The moving shafts 14 are fixed coaxially with each other. The axial center position O of these rotary shafts 14 is set so as to pass through the center of gravity G when the nuclear fuel assembly is placed on the assembly table 10 or to pass above the center of gravity G. Each of the rotating shafts 14 is rotatably attached via bearings 16 to the upper ends of a pair of triangular shaft support members 15 that are set at positions that do not interfere with the rotation of the assembly table 10.

Further, on the floor F, a rectangular pit (vertical hole) 17 is formed, into which the lower part of the assembly table 10 is inserted when the assembly table 10 stands upright.
Further, the pit 17 is provided on the lower surface of the assembly table 10 when it is upright.
A shock absorber 18 is attached to the inner wall surface of the.

On the other hand, the left end of the assembly table 10 in FIG. 1 is placed on a fixed column 20 installed on the floor. As shown in FIG. 3, a V block 21 having a V groove 21A extending in the longitudinal direction of the assembly table 10 is fixed to the upper end of the fixed column 20,
A cushion material 22 is fixed to the upper surface of the V block 21. Further, on the lower surface of the assembling table 10 corresponding to the V block 21, a V protrusion 23 for positioning which is fitted in the V groove 21A is formed.

On the other hand, below the right end portion of the assembly table 10 in FIG. 1, a foldable column 24 having a U-shape that opens downward is rotatably installed near the pit 17. The tiltable column 24 can support the assembly table 10 in a horizontal state, and can be tilted to a position away from the pit 17 as indicated by an arrow in the figure. on the other hand,
A stopper 25 is fixed to the lower surface of the assembly table 10 corresponding to the tiltable column 24 so as to prevent the tiltable column 24 from falling toward the center of the assembly table 10.

An elongated slit 30 extending in the longitudinal direction of the assembly table 10 with a constant opening width is formed penetrating in the width direction on the side surface of the assembly table 10 to the right and slightly below in FIG. There is. A guide member 31 having an opening of the same shape is attached to the periphery of the opening of the slit 30.

A sliding shaft 32 is arranged in parallel with the rotating shaft 14 through the guide member 31 and the slit 30, and a wheel 33 rolling along the inner peripheral edge of the opening of the guide member 31 is attached to the sliding shaft 32. (See Figure 2).
The upper ends of the arms 34 are rotatably connected to both ends of the sliding shaft 32, and the lower ends of the arms 34 are
Each arm 34 is rotatably connected to a fixed shaft 35 fixed to the lower portion of the shaft support 15 so that each arm 34 is vertical when the assembly table 10 is horizontal.

Further, the rod ends of the cylinders 36 are rotatably connected to the central portions of the respective arms 34, and the base end portions of these cylinders 36 are provided on the opposite side of the arm 34 from the shaft support 1.
5 is rotatably connected to the lower end through a cylinder shaft 37.

When the assembly table 10 is horizontal, each cylinder 3
6 rods are maximally projected, and when the rods of these cylinders 36 are then retracted, each arm 34
Is pulled and falls to the cylinder 36 side, and the wheels 3 of the arm 34
3 rolls along the guide member 31 and the assembly table 10
Is pulled by the arm 34, and finally the assembly table 10 stands upright so that the buffer 18 comes into contact with the inner wall surface of the pit 17.

In the erection device of the fuel assembly assembly stand configured as described above, since each rotation shaft 14 supports the vicinity of the center of gravity G of the assembly stand 10, the rotation moment of the assembly stand 10 is small and the power required for standing up is small. It can be small. Therefore,
Since only one pair of small cylinders 36 need to be used as the driving means and the structure of the device is simple, the equipment cost is low and the installation space of the entire device may be small.

Further, in this device, assuming that the locus of the connecting points of the arm and the assembly table is divided into six equal parts as shown in FIG.
The rotation angles of the assembly table corresponding to 0 to P6 are changed to A1 to A6, respectively, as shown in the drawing. In addition, X is the rotating shaft 14.
Is the distance between the sliding shaft 32 and the sliding shaft 32 in the direction orthogonal to the assembly table 10. As is clear from this figure, the assembly table 10 does not move at a constant speed during the transition from the horizontal state to the upright state, but starts to rotate very gently, gradually accelerates and decelerates, and then slowly again. Upright and stop. Therefore, there is a margin for safety confirmation at the start of standing up and just before completion of standing up, easy operation, less shock given to the fuel assembly at the time of starting / stopping, and the standing up method using the above-mentioned crane or a powerful cylinder. Compared with the structure in which the lower surface of the assembly table is directly pushed up, there is also an excellent advantage that the work safety is significantly higher.

If the structure of the above embodiment is slightly modified so that the arm 34 is tilted to the horizontal position as shown in FIG. 5, the rotation speed of the assembly table 10 near the upright position can be further reduced. You can In this case, the assembly table 10
The arm 34 also has a function of blocking the rotation of the assembly table 10 in a state where the arm stands vertically.

The mounting position of each cylinder 36 is not limited to the illustrated position as long as the arm 34 can be rotated, and a motor driving machine or the like is used as the driving means of the arm 34 in addition to the cylinder. May be.

[Advantages of the Invention] As described above, according to the fuel assembly assembly stand upright device of the present invention, since the rotation shaft supports the position near the center of gravity of the assembly stand, the rotation moment of the assembly stand It is small and requires a small amount of power to stand up the assembly table, and requires only a small cylinder or the like as the driving means. At the same time, since the structure of this erection device is simple, the equipment cost is low and the installation space is small.

In addition, according to this device, the assembly table in the horizontal state is started very gently, then gradually accelerated, then gradually decelerated, and then upright again at an extremely slow speed to stop, so that when starting up. In addition to providing a sufficient margin for safety confirmation at the time of stopping, the shock given to the fuel assembly is small, compared to the above-mentioned standing method using a crane or the structure in which a strong cylinder pushes up the bottom surface of the assembly table directly. It also has an excellent advantage that the safety of is extremely high.

[Brief description of drawings]

FIG. 1 is a front view of an upright device for a fuel assembly assembly stand according to the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a view taken along the arrow III in FIG. Figure 4 is an illustration of the effects of the device,
FIG. 5 is an explanatory view showing the effect of another embodiment of the present invention. On the other hand, FIG. 6 is a front view showing a conventional apparatus for assembling a fuel assembly assembly stand. F ... Floor surface, 10 ... Fuel assembly assembly table, 14 ... Rotating shaft of assembly table, 15 ... Shaft support, 17 ... Pit, 18 ... Buffer, 20 ... Fixed support, 24 …… Foldable column, 30 …… Slit (guide part), 31 …… Guide member (guide part), 32 …… Sliding shaft, 34 …… Arm, 35 …… Fixed shaft, 36 …… Cylinder, 37 ・ ・ ・… Cylinder shaft.

Claims (1)

[Claims] 1. A rotary shaft for supporting a fuel assembly assembly base in the vicinity of the center of gravity thereof so as to be vertically rotatable, a guide portion provided on the assembly base in the longitudinal direction of the assembly base, and along the guide portion. One end is slidably and rotatably connected, and the other side of the arm is rotatably supported by a fixed shaft in a state where the assembly base is horizontal and the other end is substantially vertically downward, and the assembly base is horizontal. And a drive means capable of tilting the arm from a position where the fuel assembly is erected to an upright position.