JP4155867B2 - Melt-solidified body suspension device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension device that suspends a heavy object to be suspended by remote control, and more particularly to a melt-solidified body suspension device suitable for storing a melt-solidified body of low-level radioactive waste in a drum can.
[0002]
[Prior art]
Nuclear power plants and radioactive substance handling facilities low various solid waste radioactive level generated at etc., after having compacted dissolved and solidified in a high frequency melting furnace, it is disposed underground packed in drums. Typically, dissolved in ceramic 坩堝型container called a canister, as the solidified so the solidified products were stored at 200 liter drums, filled with mortar in the gap between the solidified products and drum, e.g. It is buried in a predetermined place such as underground burial facilities.
[0003]
Although the place where the melted solid is stored in the drum can is at a low level, there is a risk of radioactive contamination. Therefore, it is required to work remotely by eliminating human access.
Moreover, in order to increase the utilization efficiency of the space of the burial site, it is necessary to store as much solid waste as possible in the drum can. For this reason, it is strongly desired that the gap between the molten solidified body and the drum can be as small as possible, for example, about 10 mm or less.
[0004]
When an object is stored in a container having no allowance, a method of grasping and suspending the upper part of the object is used. However, it is difficult to grasp by a hook or vacuum suction because a melted solid body has insufficient strength.
Usually, in order to store a heavy object in a drum can, it is possible to hang it with a wire rope or nylon sling and hang it in the drum can with a crane or the like. However, in order to release the sling in the drum can, a gap of several tens of mm is required between the molten solidified body and the drum can. There is also a method of gripping the side of the molten solidified body with a chuck mechanism that can be raised and lowered and storing it in a drum can, but after inserting the tip of the chuck between the molten solidified body and the drum can, it must be loosened. After all, a gap of several tens of mm is necessary.
As described above, the method of gripping the periphery of the molten solidified body is not preferable in terms of volume efficiency because a large gap is required between the inner walls of the container.
[0005]
In order to solve the above-mentioned problem, for example, Patent Document 1 discloses a cylindrical drum can accommodation method in which the melt-solidified body is placed upside down in advance, covered with a drum can from above, and then the melt-solidified body is inverted together with the drum can. Has been proposed. Further, in Patent Document 2, an inclined guide is inserted into an inlet portion of an inclined drum can, and a melt-solidified body is placed on the guide, which is slid along with or on the guide and stored in the drum can. Body drum packing methods and devices have been proposed. However, these methods have a problem that the apparatus becomes complicated and large, and the equipment cost becomes high.
[0006]
[Patent Document 1]
JP-A-8-248193 [Patent Document 2]
Japanese Patent Laid-Open No. 11-271696
[Problems to be solved by the invention]
Therefore, the present invention enables remote operation of a melted and solidified body of a heavy object to be suspended, particularly radioactive waste, in a storage container having a very small gap with the container wall by a simple mechanism without using a large-scale facility. It aims at providing the means which can be accommodated.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, a melted and solidified body suspension apparatus according to the present invention is provided with a suspension arm provided at the center thereof and having a pair of vertical beams extending downward, and divided in two in the circumferential direction. A split band that wraps around the body of the melted solid that is the object and suspends it, and a holding edge that holds the upper end of the split band at the lower end are formed, so that the relative position with the suspension arm can be moved up and down And a flange mechanism, one end of which is attached to the end of the split band and the other end is attached to the vertical beam, and the relative movement of the suspension arm and the flange allows the diameter of the split band to be enlarged or reduced, and the suspension A link actuating mechanism for moving the lower arm and the flange relative to each other is provided.
[0009]
According to solidified products suspension apparatus of the present invention, since the suspended lifting and tighten in bondage band having a large contact area with the body of the object, a structurally fragile solidified products are high temperature treatment Also, it can be safely transported by remote control and stored in a storage container having a small gap between the inner wall of the drum, such as a drum, and the molten solidified body.
[0010]
Further, the melt-solidified body suspension device of the present invention enables the above-described vertical beam, split band, and restraining edge to be inserted into the gap between the body of the melt-solidified body and the inner surface of the container that accommodates the melt-solidified body. It is also possible to release the tightening of the split band by the link mechanism while the body is stored in the container.
According to said structure, a split band becomes a hanger and the fastening by a split band and the cancellation | release can be performed only by operation | movement of a link mechanism. In other words, the device is covered with a melted solid, which is the object to be suspended, with a crane, etc., the circumference of the trunk is wound with a split band, the link mechanism is operated and the split band is tightened. The molten and solidified body can be lifted and hung.
[0011]
In addition, as long as the lower part of the device enters the gap between the molten solidified body and the storage container, the molten solidified body can be suspended to the bottom of the container. If it is taken out, the molten solidified body is left at the bottom of the container can. Therefore, it is sufficient if there is a gap between the body of the melt-solidified body and the inner surface of the container, which is about the same as the thickness of the connecting member of the vertical beam and the link mechanism of this apparatus. Can be stored.
[0012]
The split band used in the present invention is preferably formed of an elastic plate on the outside and a belt-like sling material bonded to the inside. According to this configuration, when the split band is tightened by the link mechanism, the melted and solidified body is bound by the average force due to the elastic force of the elastic plate. On the other hand, when the split band is not tightened, the sling material is expanded by the elastic plate. Therefore, since the inner surface of the sling material does not press the surface of the melt-solidified body, the apparatus can be moved up and down smoothly along the surface of the melt-solidified body.
The link actuating mechanism of the present apparatus may be a hydraulic direct acting cylinder that adjusts the distance between the suspension arm and the flange by expansion and contraction of the piston of the cylinder. Thereby, a link action | operation mechanism can be comprised simply and compactly.
[0013]
In the apparatus of the present invention, it is preferable to arrange an annular guide member that makes a round between the molten solidified body and the inner wall of the container at the lower end of the vertical beam of the suspension arm. A tapered portion is provided on the inner and outer surfaces of the lower edge of the guide member.
Such a guide member is intended for alignment when the apparatus is suspended. That is, when the device is suspended on the melt-solidified body, the tapered portion provided on the inner side of the guide member contacts the melt-solidified body, which serves as a guide to align the suspension arm, Can be made to substantially match. Further, when the apparatus in which the melted and solidified body is suspended is suspended in the storage container, the taper portion provided on the outer side of the guide member serves as a guide and can be similarly aligned. In general, it is very difficult to adjust the lifting means such as a crane by remote control so as to accurately align the apparatus with the molten solidified body and the storage container. However, according to the above-described configuration, an operator such as a crane only needs to perform approximate positioning, and is suspended so that the center of the apparatus and the melt-solidified body or container substantially coincide with each other by the action of the guide member. be able to.
The melted and solidified product targeted in the present invention is low-level radioactive waste melted and solidified in a canister, and the storage container may be a drum can.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a melt-solidified body suspension device of the present invention will be described in detail with reference to the drawings based on embodiments.
FIG. 1 is a perspective view showing a configuration of a melt-solidified body suspension apparatus according to an embodiment of the present invention. The apparatus hanging arm 1, flange 2 divides the band 3, consists of the link mechanism 4 and the link operating mechanism or the like, tighten the body of solidified products 5 by the operation of the link mechanism 4 at split band 3, FIG. The crane is lifted and hung by a crane not shown.
[0015]
The suspension arm 1 is composed of an upper horizontal beam 6 and a pair of vertical beams 7. A suspension 8 is provided at the center of the horizontal beam 6, and the lower end of the vertical beam 7 is annular so as to connect both ends thereof. A (short cylindrical) guide member 9 is attached. A taper is formed over the entire lower circumference of the guide member 9 in a direction in which the wall thickness decreases as the inner and outer surfaces go down. It has the function of a positioning guide when it is suspended.
[0016]
The flange 2 includes a top plate portion 10 and a cylindrical portion 11 extending downward from the peripheral edge thereof. The top plate 10 is attached below and in parallel to the horizontal beam 6, and the diameter of the top plate 10 is formed to be approximately the same as or slightly larger than the length of the horizontal beam 6. The lower edge of the cylindrical portion 11 is cut horizontally to form a restraining edge that suppresses the upper edge of the split band 3. Further, the position you opposite sides of the cylindrical portion 11, the guide grooves are provided, the inside of this groove longitudinal beam 7 is configured to be able to move up and down.
[0017]
In this embodiment, a hydraulic direct acting cylinder is used as the link operating mechanism, the hydraulic cylinder body 12 is fixed to the center upper part of the top plate portion 10 of the flange, and the piston 13 is fixed to the center lower surface of the transverse beam 6. ing. Therefore, the flange 2 is attached to the transverse beam 6 via a hydraulic cylinder, and is configured such that the distance between the suspension arm 1 and the flange 2 is changed by the expansion and contraction of the piston 13.
[0018]
The split band 3 is divided into two in the circumferential direction, and both ends thereof are attached to a pair of vertical beams 7 via link mechanisms 4 respectively. FIG. 2 is an enlarged view of part A in FIG. 1 and is a perspective view showing the structure of the attaching part of the split band. A pair of split bands 3a, each end portions of 3b, the attachment member 14 is attached, parallel connecting members 15 of a pair in each mounting member 14 is Closing by a pin 16, the other end of the connecting member 15 Is attached to a predetermined position below the vertical beam 7 by a pin 16. Both of the pair of connecting members 15 can freely rotate around the pins 16 on both sides to form parallel links.
[0019]
The main part of the split band 3 (shown only in the vicinity of the end portion in FIG. 2) has a double structure, and an elastic plate 17 on the outside and a belt-like sling material on the inside (a flexible polymer used for a belt-like suspension Material). As the elastic plate 17, for example, a metal thin plate, in particular, a highly elastic metal strip such as spring steel or phosphor bronze is used. In this embodiment, a nylon sling is used as the sling material 18. The elastic plate 17 is combined with the mounting member 14, and the sling material 18 is joined to the elastic plate 17 with an adhesive. In the free state, the split band 3 is subjected to a force that increases its diameter as much as possible due to the elastic force of the elastic plate 17.
[0020]
FIG. 3 is an explanatory view of the operation of the link mechanism in the apparatus of the present embodiment. FIG. 3 (a) is a state before tightening the split band when staking the molten solidified body, and FIG. The state after tightening the split band is shown.
As can be seen in FIG. 3A, before tightening, no pressure is applied to the hydraulic cylinder 12, the piston 13 is contracted, and the flange 2 is lifted slightly above the vertical beam 7. . Therefore, the split band 3 is in a free state where it is not pressed against the restraining edge 19 at the lower end of the flange, and the split band 3 is pushed outward by the elastic force of the elastic plate 17 and floats up from the surface of the molten solidified body 5. Yes.
[0021]
In this state, the length of the elastic plate is adjusted so that the outer diameter of the split band 3 is substantially the same as the outer diameter of the flange 2. Therefore, a gap of several mm is secured between the inner surface of the split band 3 and the melt-solidified body 5, and this lifting device can be freely raised and lowered around the melt-solidified body. At this time, the free end connected to a split band 3 of the attached link Organization 4 vertically beam 7 is raised to the split band 3, connecting member 15 is in the substantially horizontal.
[0022]
When the lifting device is lowered to a predetermined position, as shown in FIG. 3B, the hydraulic cylinder 12 is pressurized and the piston 13 is extended. As a result, the flange 2 is pushed down and the restraining edge 19 pushes the split band 3, so that the connecting member 15 of the link mechanism 4 attached to the vertical beam 7 is pushed down and tilted obliquely to pull the split band 3. The diameter of 3 is reduced, and the sling material on the inner surface thereof is strongly pressed against the surface of the melt-solidified body 5 to secure a slung state, and the melt-solidified body 5 can be safely lifted with a crane or the like.
[0023]
On the other hand, after the melted and solidified body 5 is suspended in a container such as a drum can, if the pressure of the hydraulic cylinder 12 is released, the state of FIG. 3B returns to the state of FIG. Therefore, if the lifting device is raised here, only the lifting device can be easily pulled out, and the molten solidified body can be stored in the drum can.
[0024]
As described above, since this apparatus is mainly used for handling a molten solidified body of low-level radioactive waste, it is a necessary condition that it can be operated only by remote operation in principle. However, it is very difficult to accurately position the apparatus, the molten solidified body, and the drum can with a lifting means such as a crane without performing direct manual adjustment.
The apparatus of the present embodiment solves this problem by arranging an annular guide member 9 at the lower end of the suspension arm 1.
[0025]
FIG. 4 is an explanatory view of the action of the guide member in the apparatus of the present embodiment. FIG. 4 (a) shows a case where the apparatus is suspended on the molten solidified body, and FIG. 4 (b) shows a case where the molten solidified body is suspended. The case where this apparatus is suspended in a drum can is shown.
First, when the apparatus is suspended on the melt-solidified body, as shown in FIG. 4 (a), the taper portion 20 (the broken line portion in the figure) provided inside the guide member 9 serves as a guide and is suspended. Centering can be performed almost automatically while the arm 1 is suspended. Therefore, the crane operator can easily suspend the apparatus around the melt-solidified body 5 by the action of the taper portion 20 if the crane operator performs an approximate alignment.
[0026]
On the other hand, when the apparatus in which the melted and solidified body is suspended is suspended in the drum, the taper portion 21 provided outside the guide member 9 serves as a guide as shown in FIG. Therefore, if the operator of the crane operates the crane with such an accuracy that the melted solid body 5 fits inside the drum can 22 (there is usually a gap of about 10 mm between the two), the operation of the taper portion 21 is performed thereafter. Thus, the apparatus in which the melted solid body 5 is suspended by swinging the suspension arm 1 back and forth and right and left can be smoothly accommodated in the drum can 22.
[0027]
Solidified products suspension apparatus of the present invention because it is constructed as described above, thus only the operation of the link mechanism, it is possible to perform the tightening and its release by the split bands. Therefore, as long as the vertical beam enters the gap between the molten solidified body and the drum can, slacking with the split band and release thereof can be performed, so that there is a gap of the same degree as the thickness of the connecting member of the vertical beam and the link mechanism. It is sufficient that the gap is 10 mm or less.
[0028]
Further, the split band having a two-layer structure of an elastic plate and a sling material has an effect of further reducing the gap between the surface of the melt-solidified body and the inner wall of the storage container. In other words, since the sling material is pushed and expanded by the elastic plate, the sling material does not press the surface of the molten solidified body when the tightening force is released. Therefore, the split band can be smoothly moved up and down along the surface of the melt-solidified body before tightening or after the release thereof, and the work can be performed sufficiently smoothly by remote control even in a gap of about 10 mm.
[0029]
Furthermore, providing an annular guide member at the lower end of the suspension arm and providing a tapered portion on the inner and outer surfaces of the guide member is very useful for smooth operation by remote operation. As already described, it is very difficult to perform alignment with accuracy within a few millimeters by moving a crane or hoist in the absence of a positioning operator. In the apparatus of the present invention, the required accuracy of positioning can be greatly relaxed by providing the above guide.
The apparatus of the present invention has a simple structure and does not require a large facility for overturning or tilting the molten solidified body and the drum can as in the method proposed in the aforementioned patent document. Also, the work is only lifting and hanging by crane and hydraulic remote control, and the work process is simpler than the method of the above-mentioned patent document.
[0030]
In addition, it is not necessary to limit the suspension target object and storage container of the apparatus of this invention to a melt-solidified body and a drum can, It can be used for accommodating various cylindrical bodies in the container adapted to this. In addition, it is not always necessary that the object to be suspended is a cylinder, and it is possible to grip various objects by using an adhesion jig with a structure and material suitable for its cross-sectional shape and surface condition. It is.
[0031]
Further, the structure, shape, etc. of each part of the apparatus of the present invention are not limited to those of the above embodiments. For example, the shape of the horizontal beam, the vertical beam, and the guide member of the suspension arm need not be limited to those of the embodiment. However, for the purpose of insertion into a narrow gap, it is desirable that the lower part of the vertical beam and the guide member are as thin as possible and the thickness of the mechanism part is as small as possible within a range where necessary strength can be ensured. Further, the shape of the flange does not necessarily need to be composed of the top plate portion and the cylindrical portion. In short, this flange is a structure that can move relative to the suspension arm only in the vertical direction, and it is sufficient that a restraining edge that suppresses the split band is formed at the lower end.
[0032]
Further, link Organization is necessarily may not be the pair of parallel links, from the purpose of the action as much as possible equal force in the width direction of the split bands are preferably parallel link using a plurality of connecting members . The link operation mechanism need not be limited to the hydraulic cylinder, and may be other fluid pressure operation or mechanical force such as a motor. However, for the purpose of simplifying the structure and mounting of the link operating mechanism, it is preferable to use a linear cylinder with fluid pressure, particularly hydraulic pressure.
[0033]
【The invention's effect】
As described above, the melt-solidified body suspension device of the present invention suspends the melt-solidified body with a split band and a link mechanism that tightens the split band, so that the gap between the container wall surface and the container wall is very small. The melted and solidified body can be easily stored by remote control. The configuration of this apparatus is simple and compact, and does not require a large facility for overturning or tilting the melt-solidified body and the storage container as found in the conventional system. Also, the work is only lifting and hanging by remote operation of crane and hydraulic pressure, and it has a feature that a heavy object can be stored in a container with a clearance of about several mm from the container wall surface with a simple work process. is doing. Therefore, by applying to a melt-solidified body, low-level radioactive solid waste can be disposed of more efficiently than before.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a melt-solidified body suspension apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a structure of a split band attaching portion in the apparatus of the present embodiment.
FIG. 3 is an explanatory diagram of the operation of the link mechanism in the apparatus of the present embodiment.
FIG. 4 is an explanatory view of the action of a guide member in the apparatus of the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Suspension arm 2 Flange 3, 3a, 3b Split band 4 Link mechanism 5 Molten solidified body 6 Horizontal beam 7 Vertical beam 8 Lifter 9 Guide member 10 Top plate part 11 Cylindrical part 12 Hydraulic cylinder 13 Piston 14 Mounting member 15 Connecting member 16 pin 17 elastic plate 18 sling material 19 restraining edge 20 inner surface taper portion 21 outer surface taper portion 22 drum can

Claims (6)

A suspension device comprising a suspension arm, a flange, a split band, a link mechanism, and a link actuating mechanism, wherein the suspension arm has a pair of vertical beams provided with a handle on the upper surface and extending downward from both ends, A flange that covers the side surface of the object to be suspended and forms a restraining edge that suppresses the upper side of the split band at the lower end, and a cylindrical body having a guide groove that guides the vertical beam up and down on the side surface; Is divided into two in the circumferential direction, and the diameter changes along the restraining edge, and the link mechanism is connected to one end of the longitudinal beam and the other end to the end of the split band, and the link operation A mechanism connects between the longitudinal beam and the flange, expands and contracts the distance between them, and pushes the split band to reduce or enlarge its diameter, and the split band is attached to the trunk of the suspended object. Winding Releasing the the hanging down objects by loosening the conditioned gripped winding is melt solidified suspension apparatus according to claim. The vertical beam, the split band and the holding edge can be inserted into the gap between the trunk portion of the suspended object and the inner surface of the container that accommodates the suspended object, and the suspended object is accommodated in the container. 2. The melt-solidified body suspension device according to claim 1, wherein the split band is pulled out after the tightening of the split band by the link mechanism. The melt-solidified body suspension device according to claim 1 or 2, wherein the split band includes an elastic plate on the outer side and a belt-like sling material bonded to the inner side. 4. The link operating mechanism according to claim 1, wherein the link operating mechanism is a hydraulic direct acting cylinder, and an interval between the suspension arm and the flange is adjusted by expansion and contraction of a piston of the cylinder. The melt-solidified body suspension device. An annular guide member that makes one round along the gap between the suspended object and the storage container is disposed at the lower end of the vertical beam, and a tapered portion is provided on the inner and outer surfaces of the lower edge of the guide member. The melt-solidified body suspension apparatus according to any one of claims 1 to 4. 6. The melt-solidified body suspension device according to claim 1, wherein the object to be suspended is low-level radioactive waste melted and solidified in a canister, and the storage container is a drum can.

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