JPS64196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for attaching and removing bolts for container lids and the like.

The lids of spent nuclear fuel transport containers (hereinafter simply referred to as casks) are usually opened and closed underwater to prevent exposure to high-level radiation.
When opening the cask lid underwater, first remove the mounting bolts on the ground, then submerge the cask in the water and lift the lid. Furthermore, when closing an empty cask, all the tightening of the lid mounting bolts had to be done on the ground, as radiation inside the cask is weak. Conventionally, the work of attaching and removing the above-mentioned mounting bolts has been carried out directly by workers, which poses the risk of exposing the workers to radiation, and requires work at heights, which is dangerous work for workers. It was hot.

Therefore, the present invention provides a pair of rails on both sides of a container holding pit, a traveling carriage that can run freely on the pair of rails, and a lifting platform supported on the traveling carriage via a lifting cylinder device. A traversing platform is provided on the elevating platform, which is movable in a direction perpendicular to the traveling direction of the traveling platform, and a traversing platform is provided on the traversing platform, which is movable in the same direction as the traveling direction of the traveling platform. A rotary table is rotatably supported in the horizontal plane at the center of the stand, a bolt attachment/removal jig is rotatably supported on the rotary table at a position corresponding to the mounting bolt of the container lid, and a jig for attaching and removing bolts is rotatably supported on the rotary table at a position corresponding to the mounting bolt of the container lid. The suspension is provided with a centering guide that can be fitted onto the outside, the traveling platform is provided with a drive means for rotationally driving the bolt attaching/detaching jig, and the traveling platform is provided with a moving means for moving the traveling platform and the traveling platform. .

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 18. In Figures 1 and 2, 1
3 is a pool for storing spent nuclear fuel transportation containers (hereinafter simply referred to as casks) 2, and 3 is this pool 1.
A holding pit formed on the side of the cask 2 is used when opening and closing the lid 4 of the cask 2. Therefore, the depth of this holding pit 3 is shallow, that is, the lid 4 of the cask 2
The depth is such that it is exposed. In FIGS. 4 to 7, reference numeral 5 denotes a running trolley that can run freely via wheels 7 on a pair of first rails 6 arranged on both sides of the holding pit 3, and is approximately U-shaped in plan view. It is composed of a frame-like member. Note that one end is open so that it can be moved onto the cask 2. Reference numeral 8 designates an electric motor with a reduction gear for driving the wheel 7, which is connected to the wheel 7 via a chain 9 and sprockets 10, 11. 1
Reference numeral 2 denotes a lifting platform supported on the traveling carriage 5 via four electric cylinders 13, and is constituted by a frame-like member that is substantially square-shaped in plan view. Reference numeral 14 denotes a traversing platform which is movably supported on the elevating platform 12 in a direction B perpendicular to the traveling direction A of the traveling platform 5, and is constituted by a frame-like member having a generally square-shaped shape in plan view. That is,
The frame member 12a of the lifting platform 12 in the above-mentioned right angle direction B,
A second rail 15 is disposed on the second rail 12a, and a second rail 15 is provided on the lower surface of the frame members 14a, 14a of the transverse table 14 corresponding to the frame members 12a, 12a of the lifting table 12. A mating and slidable first slide bearing 16 is provided. 1
Reference numeral 7 denotes a first cylinder device for moving the traversing table 14 in the direction of arrow B with respect to the elevating table 12, one end of which is connected to the elevating table 12 via a bracket 18 in a pin structure, and the other end is connected to the elevating table 12 via a bracket 19. and is connected to the traversing table 14 by a pin structure. Reference numeral 20 denotes a traveling platform which is movably supported on the traversing platform 14 in the same direction as the traveling direction A of the traveling vehicle 5, and is constituted by a frame-like member having a substantially square-shaped shape in plan view.
That is, the frame member 1 in the traveling direction A of the traversing table 14
A third rail 21 is arranged on 4b and 14b,
Further, a second slide bearing 22 is provided on the lower surface of the frame members 20a, 20a of the traveling base 20, and is slidable and engageable with the third rail 21. Reference numeral 23 denotes a second cylinder device for moving the traveling table 20 in the direction of arrow A with respect to the traveling table 14, one end of which is connected to the lifting table 12 via a bracket 24 in a pin structure, and the other end is connected to the lifting table 12 via a bracket 25. It is connected to the traveling base 20 by a pin structure.
Reference numeral 26 denotes a rotary table located within the frame-like member of the traveling base 20 and supported by the frame-like member so as to be freely rotatable within a horizontal plane. That is, a chevron-shaped convex portion 26a is provided at the outer peripheral end of the rotary table 26, and a plurality of table supports 27 each having a widening concave portion 27a that can be engaged with the chevron-shaped convex portion 26a are provided on the traveling base 20. ing. In addition, the 8th
As shown in the figure, bearings 28 are mounted on the upper and lower sides of the expanding recess 27a. A bolt attachment/detachment jig 30 for holding and rotating a mounting bolt (shown in FIG. 3) 29 of the lid 4 of the cask 2 is rotatably supported near the outer periphery of the rotary table 26. The bolt attachment/detachment jigs 30 are provided at positions corresponding to the respective attachment bolts 29 and in a number equal to the number of attachment bolts 29.

The bolt attachment/detachment jig 30 is shown in FIGS.
As shown in FIG. 4, a vertical shaft portion 31 rotatably held on the rotating table 26 and
a box part having an insertion hole 33a which is attached to the lower end of the guide part 32 and into which the head of the mounting bolt 29 of the lid 4 of the cask 2 can be inserted; 3
It is composed of 3. The shaft portion 31 and the guide portion 32 are engaged with each other so as to be movable in the vertical direction, and rotation in the horizontal plane is controlled by the key 34 on the shaft portion 31 side and the inner surface of the cylindrical hole 32a in the guide portion 32 in the vertical direction. The rotation is transmitted by the protruding strip 32b formed by. Furthermore, sufficient play is provided in the abutment between the key 34 and the protruding strip 32b.
The hexagonal head portions of the numerous mounting bolts 29 and the insertion holes 33a of each box portion 33 can be easily matched with each other. Note that the insertion hole 33a is formed into a dodecagonal hole. A permanent magnet 35 for holding the mounting bolt 29 is inserted into the upper part of the insertion hole 33a in the box part 33. The permanent magnet 35 can be rotated 90 degrees from the outside so that the mounting bolt 29 can be held and released. For example, if the NS pole is oriented horizontally as shown in FIG. 17, the lines of magnetic force will pass through the insertion hole 33a and the mounting bolt 29
, and if the NS pole is in the vertical direction as shown in Figure 18, the lines of magnetic force will align with the insertion hole 33.
a and therefore the mounting bolt 29 is not attracted. Note that FIGS. 15 and 16 show a jig 36 for switching (rotating) the permanent magnet 35.
It is. In FIGS. 5 and 7, reference numeral 37 denotes a driving means for simultaneously rotating the bolt attachment/detachment jigs 30. This driving means 37 is rotatably supported via a small gear 38 attached to the upper end of the shaft portion 31 of each bolt attachment/removal jig 30 and a rotating shaft 39 on the rotary table 26, and is connected to all the small gears 38. A large gear 40 that is meshed with each other, and this large gear 4
The driven bevel gear 4 provided above the rotating shaft 39 of
1, a driving bevel gear 44 fixed to a shaft body 43 rotatably supported on the traveling platform 20 via a bearing 42, and meshing with the driven bevel gear 41;
The electric motor 49 is installed on the traveling base 20 and rotates the shaft 43 via a large sprocket 45, a chain 46, a small sprocket 47, and a speed reducer 48. Further, as shown in FIG. 9, the rotary table 26 is provided with a rotation adjustment means 50 for finely adjusting the position of the bolt attachment/detachment jig 30. That is, pinion teeth 51 are provided on a portion of the outer circumference of the rotary table 26, and a third cylinder device 53 having a rack 52 that meshes with the pinion teeth 51 is attached to the traveling table 20. The rotation adjusting means 50 is used when aligning the position of the mounting bolt 29 on the lid 4 side of the cask 2 with the bolt attachment/detachment jig 30. Reference numeral 54 denotes a centering guide attached to the center of the lower surface of the rotary table 26 via a fourth cylinder device 55, and is configured so that it can be fitted onto a lid hanger 56 provided on the upper surface of the lid 4 of the cask 2.

Next, the installation and removal work of the mounting bolts of the cask lid will be explained.

() When removing the mounting bolts First, as shown in Figs.
The traveling cart 5 is moved with the lifting platform 12 raised. Next, the centering guide 54 provided on the lower surface of the rotary table 26 is lowered to the vicinity above the hanger 56 on the upper surface of the lid 4, and the lower peripheral edge 54 of the centering guide 54 is lowered.
Check whether the hanging tool 56 is placed inside 4a. If it is not inserted, move the traversing table 14 and the traveling table 20 to adjust the hanger 56 so that it is within the lower peripheral edge 54a of the centering guide 54. After completing the above confirmation, the traveling platform 14 and the traveling platform 20
The working fluid (for example, air) is removed from each moving cylinder device 17, 23, and each cylinder device 17, 23 is removed.
23 is released, and the centering guide 54 is further lowered to completely cover the hanging tool 56. At this point, the rotary table 26 and the lid 4 are aligned. Next, the rotary table 26 is slightly rotated by the rotation adjustment means 50 to align the bolt attachment/detachment jig 30 and the attachment bolt 29 of the lid 4, and then the lifting table 12 is lowered to attach the attachment bolt 29. 29 is engaged with the box portion 33 of the bolt attachment/detachment jig 30. If the hexagonal head of the mounting bolt 29 and the dodecagonal insertion hole 33a in the box part 33 do not engage at this time, the engagement angle will match when the mounting bolt 29 is rotated during the next loosening operation. Due to its own weight, the box portion 33 engages with the head of the mounting bolt 29. Next, the electric motor (with built-in torque limiter) 49 is driven to rotate the large gear 40. Then, all the small gears 38 rotate, the bolt attachment/detachment jig 30 rotates in a predetermined direction, and the attachment bolts 29 are loosened all at once. When the mounting bolt 29 is loosened, the mounting bolt 29 rises, but the rise is absorbed by the guide portion 32. and,
After confirming that all the mounting bolts 29 have been removed, the rotation of the bolt attachment/detachment jig 30 is stopped. In addition, as a method to confirm the removal of the mounting bolt 29,
A limit switch may be provided on the guide portion 32 of all the bolt attachment/detachment jigs 30, and the limit switch may be activated when the mounting bolt 29 is in the raised position. In this case, stopping the rotation may be automated by constructing an electric circuit so that the electric motor 49 is stopped after all limit switches are activated. Next, the lifting table 12 is raised and all the mounting bolts 29 are lifted. At this time, permanent magnet 35
is positioned as shown in FIG. 17, that is, so that its magnetic force acts. Then, by moving the traveling carriage 5 to a predetermined position and switching the permanent magnets 35, all the mounting bolts 29 are removed to the predetermined positions.

() When attaching a mounting bolt First, the mounting bolt 29 is held in a predetermined position by the permanent magnet 35 in the bolt attachment/detachment jig 30. Next, after moving the traveling cart 5 above the cask 2 and its lid 4 positioned in the pit 3, follow the same procedure as in () above to align the mounting bolts 29 with the bolt mounting holes 4a on the lid 4 side. Match. Next, the mounting bolt 4a is lowered and the bolt attachment/detachment jig 30 is rotated to screw the attachment bolt 29 into the screw hole 2a on the cask 2 side. At this time, excessive tightening of the mounting bolt 29 is prevented by a torque limiter on the electric motor 49 side. Furthermore, in order to prevent the individual mounting bolts 29 from being overtightened, a torque limiter may be installed between the shaft portion 31 of the bolt attachment/detachment jig 30 and the small gear 38.

As described above, according to the apparatus for attaching and removing bolts for container lids, etc. of the present invention, it is possible to automate almost all of the work for attaching and removing bolts for attaching container lids, and for example, when the container is a spent nuclear fuel transportation container, it is possible to automate the work of attaching and removing bolts for container lids. The danger of radiation exposure and the danger of working in high places can be eliminated, and since the above-mentioned device allows a large number of mounting bolts to be rotated at the same time, the work time can be shortened.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic overall plan view, Fig. 2 is a sectional view taken along the - arrow in Fig. 1, Fig. 3 is a view showing when the container lid is attached, and Fig. 4
5 is a side view of the device, FIG. 5 is a view taken from the − arrow in FIG. 4, FIG. 6 is a view taken from the − arrow in FIG. 4, FIG. 7 is a plan view of FIG. 4, and FIG. Fig. 9 is a plan view of the main part, Fig. 10 is a front view of the bolt attachment/detachment jig, and Fig. 11 is the - of Fig. 10.
12 is a sectional view taken along the - arrow of FIG. 10, FIG. 13 is a sectional view taken along the - arrow of FIG. FIG. 16 is a side view of the permanent magnet switching jig, FIG. 16 is a front view thereof, and FIGS. 17 and 18 are explanatory diagrams of the operation of the permanent magnet. 1... Pool, 2... Spent nuclear fuel transport container (cask), 3... Holding pit, 4... Lid, 5...
...Traveling trolley, 12... Lifting platform, 13... Electric cylinder, 14... Traversing platform, 15... Second rail,
16...first slide bearing, 17...first
Cylinder device, 20... traveling platform, 21... third
Rail, 22...Second slide bearing, 23
. . . Second cylinder device, 26 . ...Third cylinder device, 54...Centering guide, 55...Fourth
Cylinder device, 56... Lid hanging tool.

Claims (1)

[Claims] 1 A pair of rails are provided on both sides of a container holding pit, a traveling trolley is provided that can run freely on the pair of rails, an elevating platform is supported on the traveling trolley via an elevating cylinder device, and the elevating and lowering A traversing platform is provided on the platform that is movable in a direction perpendicular to the traveling direction of the traveling platform, a traversing platform is provided on the traversing platform that is movable in the same direction as the running direction of the traveling platform, and the traversing platform rotates at the center of the platform. A table is rotatably supported in a horizontal plane, a bolt attachment/removal jig is rotatably supported on the rotary table at a position corresponding to the mounting bolt of the container lid, and a bolt attachment/removal jig is rotatably supported on the rotary table at a position corresponding to the mounting bolt of the container lid. A container lid or the like, characterized in that a centering guide that can be fitted is provided, a driving means for rotationally driving a bolt attachment/detachment jig is provided on the traveling base, and a moving means for moving the traveling base and the traveling base is provided. bolt attachment and removal device.