JPH05878Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a suspension device for a transport cask that stores and transports spent fuel to a nuclear facility.

[Prior art and its problems]

When transporting a transport cask that stores and transports spent fuel at a nuclear reactor facility, a hook is hung from a pair of trunnions provided on the transport cask, and transport is carried out by winding and unrolling a wire rope attached to this hook. The cask is being lifted and lowered. In this case, since lifting and lowering of the transport cask is conventionally carried out by a drive system consisting of a single wire rope or the like, a lifting device equipped with a hanging tool having a pair of hooks is used. However, in recent years, in order to improve safety, the drive system for lifting and lowering the spent fuel transport cask has been replaced with an independent two-way system to prevent the spent fuel transport cask from falling.
There is a growing demand for systematization. For this reason, it has become necessary to provide two pairs of trunnions in the transport cask, and to handle these trunnions with two pairs of slings and with respective drive systems.

Therefore, unlike conventional hanging devices, there is a need for a hanging device that includes two pairs of hanging devices and has two drive systems.

[Purpose of invention]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a transportation cask hoisting device equipped with a hoisting device that doubles the hoisting system.

[Summary of the idea]

According to the present invention, in a transport cask lifting device for lifting and suspending a transport cask having two pairs of trunnions, a pair of L-shaped hooks hanging from each pair of said two pairs of trunnions is provided. a pair of elongated hook plates each having a hole; a first beam having a pair of elongated hook plates each having a hole; the respective hooks being connected by pin joints provided at both ends; A second pin joint is provided in each groove that intersects at right angles in the center and is open on the top and bottom surfaces of both end surfaces, and the hook plate and the first lever are respectively connected to the pin joint joint.
a cross-shaped lower beam consisting of a beam; and a cross-shaped lower beam arranged in parallel above the second beam of the lower beam, the second lever and the third lever being respectively connected by a pin joint, and further connected to the upper part. A first member that connects an upper beam provided with a pulley, the second lever and a hook plate with a pin joint;
a second link mechanism that connects a third lever and the first lever with a pin joint and is disposed axially symmetrically with the first link mechanism;
A first winding drum that winds up and unwinds the wire rope that is wound and fixed on the pulley of the lower beam, and a second winding drum that winds up and winds up the wire rope that is wound and fixed on the pulley of the upper beam. It consists of a winding drum, and a drive machine that drives the first winding drum and the second winding drum, respectively, and links the link movement of the link mechanism due to the lifting and lowering of the upper beam to the second link mechanism and the hook. This is achieved by limiting it by contact with the plate.

[Example of idea]

Embodiments of the present invention will be described below based on the drawings. Fig. 1 is a perspective view of a suspension system equipped with a transportation cask hoist according to an embodiment of the present invention, Fig. 2 is a side view of the hoist of Fig. 1, and Fig. 3 is a P of Fig. 2.
The arrow view and FIG. 4 are sectional views taken along the line AA in FIG. 2.
In Figures 2 to 4, 1 is a transport cask that stores spent fuel, and has two pairs of trunnions on its upper part, namely, a pair of main trunnions 2 provided at opposite positions, and a pair of main trunnions 2 disposed at right angles to the main trunnions 2. A pair of auxiliary trunnions 3 are provided at positions facing each other in the direction.

The transport cask 1 is lifted and suspended by a pair of L-shaped hooks 6 and a pair of elongated hook plates 10 having holes 12, respectively, suspended from these two pairs of main trunnions 2 and auxiliary trunnions 3. .

As shown in FIG. 4, the hook 6 is pin-coupled to a pin joint 9 provided in a groove 8 opened on the upper and lower surfaces of both end surfaces of one first beam 4a of the cross-shaped lower beam 4. . Further, the hook 6 is provided with a pin joint 5 that is rotatable in a direction perpendicular to the rotation direction of the pin joint 9, so that the hook 6 can be easily attached to the main trunnion 2.

On the other hand, the elongated hook plate 10 is perpendicular to the lower plate 1.
0a and an upper plate 10b, the lower plate 10a is provided with a long hole 12 consisting of a continuous small hole 12a and a large hole 12b into which the auxiliary trunnion 3 is fitted, as shown in FIG. The large hole 12b is larger than the outermost collar 3a of the auxiliary trunnion 3 shown in FIG. 2, and the small hole 12a is designed to fit the hanging shaft 3b of the auxiliary trunnion 3.

The hook plate 10 is provided with a pin 11a on the upper plate 10b, and this pin 11a connects the second beam 4b which intersects the first beam 4a at a right angle in the center.
The hook plate 10 is fitted into long holes 13 provided in the side walls of grooves 8a opening on both end faces of the hook plate 10.
are pin-coupled with a pin joint 11. Note that this pin joint 11 is also provided with a first lever 19 that is coupled with a pin.

An upper beam 15 is provided parallel to and above the second beam 4b of the lower beam 4, and a pin joint 16 is provided on the upper beam 15 at a position corresponding to directly above the pin 11a. The pin joint 16 has a second lever 18 and a third lever 20.
are connected by pins. The second lever 18 is pin-coupled with a pin 23 provided on the upper plate 10a of the hook plate 10 to form a first link mechanism 24, while the third lever 20 is connected to the first lever 19 and a pin joint 22. A second link mechanism 25 is formed by pin-coupling. The second link mechanism 25 and the first link mechanism 24 are arranged axially symmetrically.

In addition, as shown in FIG. 3, the second link mechanism 2
5 are arranged in two rows sandwiching the first link mechanism 24. On the other hand, a corner of the upper plate 10b of the hook plate 10 is provided with a quadrant-shaped notch 14 for restricting the link movement of the second link mechanism 25.

Therefore, when the upper beam 15 is lowered with the lower beam 4 fixed, the first and second link mechanisms 24 and 25 perform a link movement and move in the direction of expansion. Therefore, the first link mechanism 24 moves the hook plate 10 from the vertical position shown in FIG. 2 in the opening direction, and finally the hook plate 10 moves as shown in FIG.
is in a horizontal position and fully open. Also, if the upper beam 15 is raised in this state, the first and second
The link mechanisms 24 and 25 are narrowed, and the hook plate 10 assumes a vertical position as shown in FIG. At this time, the large hole 12a of the long hole 12 of the hook plate 10 passes through the collar 3a of the auxiliary trunnion 3 and is fitted onto the shaft 3b. In this case, the pin connecting portion 22a spanning the two rows of second link mechanisms 25 is connected to the notch 1 of the hook plate 10.
4, thereby restricting the movement of the link mechanisms 24 and 25 so that the hook plate 10 maintains the above-mentioned vertical posture.

When the upper beam 15 is further raised in this state, the hook plate 10 is raised, the elongated hole 12 is raised with the auxiliary trunnion 3 fitted therein, and the small hole 12b is locked to the hanging shaft 3b of the auxiliary trunnion 3.
In this case, the pin 11a of the hook plate 10 also rises through the elongated hole 13 of the second beam 4b.

When the upper beam 15 is further raised in this state, the lower beam 4 is raised simultaneously with the upper beam 15 via the first and second link mechanisms 24 and 25.
The fuel cask 1 can be lifted up by a hook plate 10.

Therefore, when the fuel cask 1 is suspended by the main trunnion 2 and the auxiliary trunnion 3, the upper beam 15 is first lowered relative to the lower beam 4, and the hook plate 10 is brought to the fully open position by the link mechanism.
In this state, the upper beam 15 and the lower beam 4 are lowered simultaneously, and the hook 6 is first hooked onto the main trunnion 2. Next, only the upper beam 15 is raised, and the hook plate 10 is closed by the link mechanism, placed vertically, and fitted into the auxiliary trunnion 3. The upper beam 15 and the lower beam 4 are then raised simultaneously, and the fuel cask 1 can be lifted. When the fuel cask 1 is to be separated from the hook 6 and the hook plate 10 and placed on the fuel cask 1, the above procedure is carried out in reverse.

Next, a means for raising and lowering the above-mentioned upper beam and lower beam will be explained. In FIG. 2, pulleys 7 on which wire ropes 36 are wound are attached to the lower beam 4 at both ends of the beam 4a. Further, a pulley 30 on which a wire rope 41 is wound is attached to both ends of the upper beam 15.

Therefore, by winding and unwinding the wire rope 36, the lower beam 4 is raised and lowered, and by winding and unwinding the wire rope 41, the upper beam 15 is raised and lowered. and wire ropes 36 and 41
The lower beam 4 is rolled up and rolled out in synchronization with the lower beam 4.
and the upper beam 15 can be raised and lowered simultaneously.

Fig. 1 shows the system configuration of a transportation cask hoisting device that operates a hoisting device consisting of a lower beam and an upper beam provided with hooks and hook plates using wire ropes. Hook 6, hook plate 10, first and second link mechanisms 24 and 25, pulley 7, upper beam 1
5. The structure and operation of the pulley 30 etc. are the same as described above. A first winding drum 31 is provided which winds up the wire rope 36 wound around the pulley 7 that raises and lowers the lower beam 4, and is supported by a bearing 35.
An electric motor 32 is provided as a drive unit connected to the shaft of the first winding drum 31. Note that the wire rope 36 wound around the pulley 7 is fixed from the first winding drum 31 to a fixed pulley 34 via an intermediate fixed pulley 33.

And a pulley 3 that raises and lowers the upper beam 15
A second winding drum 37 for winding up the wire rope 41 which has been wound up to zero is provided and supported by a bearing 40,
An electric motor 38 as a drive unit is connected to the shaft of the second winding drum 37. Note that the wire rope 41 wound around the pulley 30 is fixed to a fixed pulley 42 from the second winding drum 37 via an intermediate fixed pulley 39.

With such a configuration, the hook 6 and the hook plate 10
When raising and lowering the entire hanging device consisting of the lower beam 4 and the upper beam 15 provided with
2 and 38 to rotate the lower beam 4 periodically.
and the upper beam 15 are raised and lowered while maintaining a constant distance.

When suspending the transport cask trunnion using a lifting device to lift the transport cask, first
The rotation of the winding drum 31 is stopped and fixed, the lower beam 4 is kept at a constant position, and the second winding drum 37 is rotated by the electric motor 38, so that the wire wound on the second winding drum 37 is rotated. Let out the rope 41. Therefore, the upper beam 15 is lowered via the pulley 30 due to the action of the wire rope 41 and the intermediate fixed pulley 39 and the fixed pulley 42 . This lowering causes the first and second link mechanisms 24,
25 is opened, and the action of the first link mechanism 24 brings the hook plate 10 to the fully open position as shown in FIG.

In this state, the entire hoist is lowered by the synchronized operation of the first winding drum 31 and the second winding drum 37, and the hook 6 is attached to the main trunnion 2 of the transportation cask 1 using the action of the pin joint. insert.

When the wire rope 41 of the second winding drum 37 is wound up by the electric motor 38 in this state, the upper beam 15 rises in the opposite manner to that described above, and the first and second link mechanisms 24 and 25 are closed. By the action of the first link mechanism 24, the hook plate 10 is closed and assumes a vertical position, and the hook plate 10 passes through the elongated hole of the collar 3a of the auxiliary trunnion 3 of the transportation kail and is fitted onto the hanging shaft 3b. When the second winding drum 37 is further rotated to wind up the wire rope 41, the pin shaft of the pin joint 11 rises along the elongated hole 13 and the hook plate 11 also rises, as shown in FIG. The hanging shaft 3b of the trunnion is locked into the small hole 12a of the long hole 12 (see FIG. 3) in the plate.

In this state, the transport cask is lifted by operating the first winding drum 31 and the second winding drum synchronously as described above so as to maintain the same distance between the lower beam 4 and the upper beam 15. Note that the transportation cask can be suspended and removed from the suspension device by the reverse procedure as described above.

[Effect of idea]

As is clear from the above description, according to the present invention, when lifting and lowering a transport cask comprising a pair of main trunnions and a pair of auxiliary trunnions, the hooks are provided between the hook, the lower beam and the upper beam. a hook plate having a hole that can be opened and closed by a link mechanism attached to the lower beam; a first winding drum that winds up a wire rope wound around a pulley provided on the lower beam; By providing a second winding drum that winds and unwinds the wire rope wound around a pulley provided in can be raised and lowered while maintaining the
By winding and unwinding the wire rope from the second winding drum, the link mechanism can be opened and closed to open and close the hook plate, so after lowering the hook plate with it open and hanging the hook on the main trunnion. The second winding drum closes the hook plate and inserts it into the auxiliary trunnion, allowing the transport cask to be lifted or lowered. Therefore, the transportation cask is handled by two independent drive systems, which improves safety.

[Brief explanation of the drawing]

Fig. 1 is a system perspective view of a transport cask hoisting device according to an embodiment of the invention, Fig. 2 is a side view of a hoisting device consisting of the hook and hook plate of Fig. 1, and Fig. 3 is the 4 is a sectional view taken along the line AA in FIG. 2, and FIG. 5 is a partial side view showing the hook plate in FIG. 2 fully opened. 1... Transport cask, 2, 3... Trunnion,
4... Lower beam, 4a... First beam, 4b
... Second beam, 9, 11, 16, 22 ... Pin joint, 6 ... Hook, 7, 30 ... Pulley, 10 ... Hook plate, 15 ... Upper beam,
18... second lever, 19... first lever,
20...Third lever, 24...First link mechanism, 25...Second link mechanism, 31...First winding drum, 32, 38...Driver, 37...Second link mechanism Winding drum.

Claims (1)

[Scope of utility model claims] A transportation cask lifting device for lifting and lowering a transportation cask having two pairs of trunnions, the device comprising a pair of L-shaped hooks hanging from each pair of the two pairs of trunnions, and a pair of hooks provided with holes. A first beam which is connected to an elongated hook plate and each of the hooks by a pin joint provided at both ends, and which is further provided with a pulley at the upper part of both ends, and which intersect at right angles at the center of the first beam. , a cross-shaped lower beam consisting of a second beam provided with pin joints in respective grooves opened on the upper and lower surfaces of both end surfaces, and connecting the hook plate and the first lever to the pin joints, respectively; and a second lever and a third lever are arranged above and parallel to the second beam of the lower beam, and each of the second lever and the third lever is connected by a pin joint,
Furthermore, an upper beam provided with a pulley on the upper part, a first link mechanism that connects the second lever and the hook plate with a pin joint, and a third lever and the first lever are connected with a pin joint,
a second link mechanism disposed axially symmetrically with the first link mechanism, and a first link mechanism that winds and unwinds a wire rope wound and fixed to the pulley of the lower beam.
a winding drum, a second winding drum for winding and winding the wire rope wound and fixed on the pulley of the upper beam, the first winding drum and the second winding drum.
a drive machine for driving each of the winding drums, and the link movement of the link mechanism due to the lifting and lowering of the upper beam is restricted by contact between the second link mechanism and the hook plate. hanging device.