JPH0726308Y2 - Lifting device rescue equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rescue device for a lifting device that can rescue a claw of a lifting device having a claw for holding a radioactive waste container when the claw fails. Regarding

[Prior Art] In nuclear power generation facilities and the like, radioactive waste to be treated is vitrified and stored in a container (canister), and the canister is stacked and stored in a storage facility.

A crane that conveys the canister is provided in the storage facility, and a suspension device that holds the canister is suspended from the crane. The lifting device is provided with a claw that is driven to come into contact with the upper portion of the canister to grip the canister or to release the grip so as to be openable and closable.

[Problems to be solved by the invention] By the way, since the canister storage facility has a high-level radioactive atmosphere, the canister is handled by remote control. If the pawl of the suspension device breaks down during this cargo handling, it cannot be repaired inside the facility where the radioactive atmosphere is stored, so the suspension device must be taken out of the facility for repair work or replaced with another suspension device. . In addition, if the pawl opening / closing mechanism fails while holding the canister, it cannot be taken out of the facility.Therefore, it is necessary to enclose it in a shielding material to perform repair work. There is a problem of being exposed to
A means for solving these problems has been desired.

The present invention was devised to solve the above-mentioned problems, and the purpose thereof is to be able to open the pawl even if the pawl fails while holding the canister, and the pawl opening / closing mechanism is provided. It is an object of the present invention to provide a hoisting device rescue device that can assist the hoisting device in failure by loading and unloading.

[Means for Solving the Problems] In order to achieve the above-mentioned object, one of the present invention is a lifting device having a claw that is hung on a crane and holds a radioactive waste container, and that opens and closes the claw and the claw. A stopper interposed between the drive shaft and the claw for transmitting the driving force to the claw,
The present invention comprises a spring for urging the pawl in the opening direction and a release mechanism for releasing the stopper to open the pawl when the pawl is closed and fails. The other one is a device that rescues the suspension device when the suspension device has a claw that is suspended from a crane and that holds a radioactive waste container, and the claw of the suspension device is broken. And a claw that is provided at the lower portion of the rescue device body and that holds the radioactive waste container.

[Operation] One of the present inventions is to open and close the claw opening / closing mechanism while holding the radioactive waste container while the radioactive waste container is being loaded by suspending the suspension device with the crane in the containment facility in a radioactive atmosphere. In case of failure, the release mechanism can be operated by the manipulator to release the stopper, and the pawl can be opened to release the grip of the radioactive waste container.

According to another aspect of the present invention, when the nail is broken as described above, the radioactive waste container is opened, and the broken hanging device is hung, and the lower portion of the hanging device is hung through the engaging means. After being connected to the body of the rescue device, the radioactive waste container can be gripped and handled by the claws of the rescue device. Further, even when a failure occurs while the pawl is open during cargo handling, the same procedure as above may be performed.

In this way, even if the opening / closing of the claws of the lifting device fails during loading and unloading, it is possible to continue loading and unloading the failed lifting device without taking it out of the storage facility and repairing or replacing it. Even if the nail breaks down while holding the container, the broken nail can be opened by a remote device without shielding, so that it is not exposed.

[Embodiment] An embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 3 show a suspension device according to the present invention.

In the figure, reference numeral 1 denotes a main body formed in a cylindrical shape. A horizontal member 2 having an outer periphery fixed to an inner periphery of the main body 1 is provided at a substantially central portion of the main body 1, and a bottom plate 3 is provided below the horizontal member 2. Is provided. On the lower surface of the horizontal member 2, a claw 5 for gripping a radioactive waste container (canister) 4 has its tip end inserted through the notch 3a of the bottom plate 3 and extends downward, and is rotated in the radial direction. It is pin-coupled so that it can move freely. Three of these claws 5 are provided at intervals in the circumferential direction,
When these claws 5 are rotated in the axial direction, the lower ends of the claws 5 catch the collar portion 4a of the canister 4 from the outside and hold it.

A crane hook (not shown) is provided on the upper portion of the main body 1.
A support block 7 having a suspender 6 that engages with is vertically movable, and the support block 7 includes three support rods provided on the upper surface of the horizontal member 2 at intervals in the circumferential direction. It is connected through 8. The upper end of the support rod 8 is inserted into the support block 7, and stoppers 9 and 9 are provided so as to sandwich the support block 7. The support block 7 can move vertically between the stoppers 9 and 9. There is.

A drive shaft 10 extending downward along the axis of the support block 7 is provided. The drive shaft 10 inserts the horizontal member 2 through which the lower end opens and closes the pawl 5. The link mechanism 11 is pivotally attached via a bearing member 12.

As shown in the drawing, the link mechanism 11 is provided with a link support member 14 having a substantially triangular shape in a plane, in which a hole 13 that is slidably contacted with an outer peripheral surface of a bearing member 12 that pivotally supports the drive shaft 10 is formed in a central portion thereof. Link members 15 are provided on the outer periphery of the link support member 14 and are pin-coupled at intervals. The tip ends of the link members 15 are pin-coupled to the corresponding claws 5 to move the drive shaft 10 up and down. By this, the claw 5 is opened and closed.

As shown in FIGS. 1 and 2, the drive shaft 10 that drives the claw 5 to open and close has a spline on the upper outer peripheral surface of the drive shaft 10.
10a is formed, and a cylindrical upper cam member 16 having an inner peripheral surface meshing with the spline 10a is provided so as to rotate integrally with the drive shaft 10, and the upper end of the upper cam member 16 has the above-mentioned support. The block 7 is rotatably supported. As shown in FIG. 4, a serrated cam groove 17 having a predetermined pitch is formed on the outer peripheral surface of the upper cam member 16, and an upper cam roller 18 rolling along the cam groove 17 is inserted through the bracket 19 to form the upper cam roller 18. It is provided on the upper surface of the horizontal member 2. Each time the drive shaft 10 moves up and down, the drive shaft 10 is rotated by a predetermined angle pitch by an upper cam roller 18 that abuts on the cam groove 17.

In addition, the drive shaft 10 between the horizontal member 2 and the link mechanism 11
A cylindrical lower cam member 20 is concentrically provided on the outer peripheral surface of the lower cam member 20.
And a cam surface 21 is formed on the lower end surface of the lower cam member 20. Recesses 22 are formed on the cam surface 21 at a predetermined pitch, and a lower cam roller 23 that contacts the cam surface 21 is provided on the drive shaft 10. The lower cam roller 23 is urged upward by the pulling force of the spring 24 for urging the link mechanism 11 and pressed against the cam surface 21, and rolls along the cam surface 21 each time the drive shaft 10 rotates. When moved and fitted into the recess 22, the drive shaft 10 is raised and the link mechanism 11 is raised to rotate the pawl 5 in the opening direction.

A spring 24 for urging the link mechanism 11 is connected to a coil spring 26 having a lower end fixed to each of spring boxes 25 provided at intervals in the circumferential direction of the horizontal member 2 and an upper end of the coil spring 26. , The coil spring 26, the lower end portion which extends downward through the spring box 25 is constituted by a traction transmission rod 27 which is connected to the outer periphery of the link support member 14 and which transmits a traction force. The traction force is the drive shaft 10
It is regulated by a stopper 28 provided between the link mechanism 11 and the link mechanism 11.

As shown in FIGS. 5 and 6, the stopper 28 is formed in a trapezoidal shape on a substantially flat surface, and has a long hole on the upper surface of the link support member 14.
A spring member 31 that restricts the movement of the stopper 28 is provided on the lower surface of the protruding portion 28a that is slidable via the 29 and the mounting bolt 30 and is rearward in the movement direction.

On the other hand, on the outer periphery of the bearing member 12, there is formed a protruding portion 32 into which the stopper 28 is fitted. The stopper 28 is fitted into the protruding portion 32 so as to restrict the rise of the link mechanism 11 and also to drive the drive shaft. The vertical movement of 10 is transmitted to the link mechanism 11.

Further, the central portion of the stopper 28 is always engaged with the above-mentioned protrusion 32, and the engagement hole is released by the movement of the stopper 28.
33, the engagement hole 33 has a front radius 33a on the front side in the moving direction of the stopper 28 that is slightly larger than the outer diameter of the bearing member 12, and a rear radius 33b on the rear side in the moving direction. It is formed to have a diameter sufficiently larger than the outer circumference including the twelve protrusions 32, and the front radius 33a is normally located at and engaged with the protrusion 32.
28 may be moved in the direction of the front arrow so that the rear radius 33b of the engagement hole 33 is located on the protrusion 32.

By the way, the hanging device configured as described above includes the claw 5
A release mechanism is provided to move and release the stopper 28 when the canister 4 fails while holding the canister 4.
Specifically, this releasing mechanism is composed of a piston 34 that pushes and moves the stopper 28 and a piston pushing means 35 that extends the piston 34.

The piston 34 has a stopper as shown in FIGS.
A cylinder 36 is horizontally provided so that its tip end abuts on the rear end of the projecting portion 28a of 28, and a cylinder 36 into which the projecting portion 28a is telescopically inserted is formed in the piston pressing hole 37 formed in the main body 1.
Is attached to. Further, as shown in FIG. 7, the piston pressing means 35 for pressing and extending the piston 34,
An L-shaped handle 41 rotatably supported on a pedestal 40 having a locking portion 39 that locks in a locking hole 38 provided in the main body 1 is provided, and between the handle 41 and the pedestal 40. Handle 41
A spring 42 is provided for returning the rotation of the. A lower end portion of the handle 41 is formed with a pressing portion 43 which is inserted into the piston pressing hole 27 of the main body 1 and pushes out the piston 26. The pressing portion 40 is formed when the handle 38 is rotated downward. It is designed to move in the extrusion direction. Also,
A grip portion 45 for gripping by the manipulator 44 is provided on the upper surface of the pedestal 40.

In addition, 46 in FIG. 1 is a claw 5 on the collar portion 4a of the canister 4.
The guide 46 is provided on the inner peripheral surface of the lower portion of the main body 1 so as to be rotatable at intervals in the circumferential direction.

Further, 47 is an engaging portion with which a main body 48 of the rescue device described later is engaged, and the engaging portion 47 is formed along the outer periphery of the lower portion of the main body 1 in the circumferential direction.

Next, a rescue device that rescues when the opening and closing of the claw 5 of the above-mentioned suspension device fails will be described.

In the rescue apparatus of this embodiment, the claws 5 for holding the radioactive waste container (canister) 4 and the mechanism for driving the claws 5 to open and close have substantially the same configuration as the above-described suspension device, and thus the same name is used. The same reference numerals are given to the components, and the description thereof will be omitted.

As shown in FIG. 8, the body of the rescue device is divided into an upper cylinder body 49 and a lower cylinder body 50 which supports the upper cylinder body 49 so that the lower cylinder body 50 can move up and down. A horizontal member 2 that rotatably supports a claw 5 that holds the canister 4 described in FIG. 1 is provided, and a bottom plate 3 is provided at a lower end portion thereof. A top plate 51 corresponding to the support block 7 that rotatably supports the drive shaft 10 is provided at the upper end of the upper tubular body 49, and the upper tubular body 49 is provided between the top plate 51 and the horizontal member 7. The vertical movement is allowed between the stoppers 9, 9 of the support rod 8 connecting the.

On the upper surface of the top plate 51, engaging means 52 for engaging with the engaging portion 47 of the suspension device body 1 of FIG. 1 is provided.

In this embodiment, three engaging means 52 are provided at intervals in the circumferential direction, and the engaging means 52 are paired on a pedestal 53 attached to the upper surface of the top plate 51 as shown in the drawing. The fixing members 54 are erected at intervals with a spacer 55 interposed therebetween, and an engaging claw member 57 is rotatably provided between the fixing members 54 via a pin 56. The inner side of these engaging claw members 57 is formed in a substantially "dogleg" shape so as to come into contact with the shape of the outer periphery of the main body 1 of the above-mentioned suspension device. A receiving portion 58 with which the lower surface of the suspension device body 1 abuts is formed, and a claw portion 59 that engages with the engaging portion 47 is formed at the upper end portion.

A rod-shaped stopper 60 that restricts the rotation of the engaging claw member 57 is provided above the fixing member 54, and below the fixing member 54, a fixing member is provided.
A rod-shaped movement stopper 62 that moves up and down in an elongated hole 61 formed in 54 is provided. As shown in FIGS. 9 to 11, the movement stopper 62 has both ends inserted into the elongated holes 61 and protruded outward, and weights 63 are fixed to both the protruded ends. A stopper receiving portion for receiving the movement stopper 62 in the housed state is provided on the rear side of the engaging claw member 57.
64 are formed. Further, the elongated hole 61 has an upper diameter larger than a diameter of the movement stopper 62 and a lower diameter smaller than that, and when the engagement claw member 57 is rotated in the engagement direction from the housed state, The movement stopper 62 falls from the receiving portion 64 and is fitted and fixed in the long hole 61.
The movement stopper 62 fitted and fixed to 61 is fixedly supported so as not to come into contact with the back surface of the engaging claw member 57 and the claw portion 59 from falling off the engaging portion 47 of the main body 1.

Next, the operation of the above embodiment will be described.

The suspending device shown in FIG. 1 is suspended by a hook (not shown) of a crane in a containment facility in a radioactive atmosphere to load and unload a radioactive waste container (canister) 4. If the pawl 5 fails while holding the canister 4 during the cargo handling, the releasing means 37 is locked in the locking hole 38 of the main body 1,
While operating the handle 41 to extend the piston 34,
It suffices to move the stopper 28 in the releasing direction to open the pawl 5, and the lifting device with the pawl 5 opened can be used with the stopper 28.
Is released, and the driving force of the drive shaft 10 is not transmitted to the claw 5, so that the engaging portion 47 of the suspension device suspended from the crane is connected to the main body 48 of the rescue device via the engagement means 52. After the engagement, the rescue device may carry the cargo of the canister 4.

It should be noted that if the rescue device is stored in a predetermined position (not shown) in the storage facility so that it can be used anytime when the opening / closing of the claws 5 of the suspension device is broken, the cargo handling is interrupted for a long time. Never.

Thus, even if the claws 5 of the suspension device are broken, the broken suspension device can be rescued promptly and the interruption time of the cargo handling can be shortened. Further, the broken suspension device can be taken out from the storage facility. There is no need to repair or replace, and even if the pawl 5 breaks down while holding the canister 4, the pawl 5 in the held state can be opened by the manipulator 44. Never.

[Effect of the Invention] The present invention has the following excellent effects.

According to claim 1 of the present invention, when the claw is broken while holding the radioactive waste container, the claw can be opened by releasing the stopper operated by the manipulator as the releasing means, and the repair work can be performed. No exposure to radiation.

Further, according to claim 2 of the present invention, when the opening and closing of the claws of the lifting device is broken, the broken lifting device can be loaded and unloaded only by connecting it to the rescue device through the engaging means. Therefore, there is no need to remove the broken lifting device to repair or replace it.

[Brief description of drawings]

1 is a longitudinal sectional view showing a suspension device according to the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIG. 5 is a perspective view showing the drive system of FIG. 5, FIG. 5 is a plan view showing a stopper, FIG. 6 is a vertical sectional view of FIG. 5, and FIG.
FIG. 8 is a side view showing the releasing means, FIG. 8 is a vertical cross-sectional view showing the rescue device of the lifting device according to the present invention, and FIGS. 9 to 11 are side views and front views showing the engaging means. In the figure, 4 is a radioactive waste container, 5 is a claw, 10 is a drive shaft, 24
Is a spring, 28 is a stopper, 34 and 35 are pistons and piston pressing means as a release mechanism, 48 is a body of the rescue device, and 52 is an engaging means.

Claims (2)

[Scope of utility model registration request] 1. A suspension device having a claw that is hung on a crane and that holds a radioactive waste container, for transmitting a driving force to the claw that is interposed between the claw and a drive shaft that opens and closes the claw. Of the suspension device including a stopper, a spring for urging the pawl in the opening direction, and a release mechanism for releasing the stopper to open the pawl when the pawl fails in a closed state. apparatus. 2. A device for rescuing a lifting device having a claw for hanging a radioactive waste container, which is hung on a crane, and which is engaged with a lower part of the hanging device. A rescue device for a hanging device, comprising: a rescue device main body having a coupling means; and a claw provided at a lower portion of the rescue device main body for holding the radioactive waste container.