JPH02127391A - Hoisting accessory for drum - Google Patents

Abstract

PURPOSE:To surely hold and hoist drums by connecting a pair of the first and second links, fork holders and circular arc-shaped forks to a liftable vertical shaft, providing a pair of expansion sections, and lifting the vertical shaft. CONSTITUTION:A pair of the first and second links 20 and 22 are connected to a liftably provided vertical shaft 15, and a pair of fork holders 24 and circular arc-shaped forks 25 with the same radius of curvature as that of a drum K are movably provided along drum barrel sections respectively on each second link 22. Each fork 25 and the second link 22 are connected by a pair of cylinders 30, the fork 25 is moved along the drum barrel section to envelope the barrel section by the expansion of this expansion section 30, and the vertical shaft 15 is lifted to hold drums. The third link 37 is connected to the vertical shaft 15 via a moving body movable up and down, and a horizontal shaft 31 connecting the fork holders 24 to the third link 37 is penetrated.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a drum hoist for hoisting a drum filled with low-level radioactive waste or the like.

``Prior art'' As is well known, low-level radioactive waste generated from nuclear power plants, etc. is sealed in drums, transported to a burial facility by a special ship, etc., and stored in a concrete container installed within the facility. It will be brought in using a crane.

A hanging device is attached to the tip of the crane to hold the drum. This hanging tool is used to handle the drum can by laying it on its side and holding both ends of the drum can.

That is, as shown in FIG. 7, a pair of claw bodies 3.3 are inserted into the recesses 2, 2 on the top plate side and the bottom plate side of the drum, and the protrusions 4.3 on the peripheral edges of the top plate and bottom plate are inserted. 4, and also by holding the top plate and the bottom plate.

``Problem to be solved by the invention'' However, as mentioned above, the drum can K is connected to a pair of claws 3, 3.
If the weight of the drum can K is large, the convex part 4 may be deformed or damaged during repeated transportation, and as a result, the drum can There is a possibility that it will come off the claw bodies 3 and 3 and fall. Furthermore, if the drum itself is corroded, deformation and breakage of the convex portion 4 are likely to be promoted, so it is necessary to prevent the above-mentioned falling.

``Object of the Invention'' This invention was made in view of the above circumstances, and aims to provide a highly safe and reliable drum hoist that can securely grip and lift a drum. .

"Means for Solving the Problems" The drum hoist of the present invention rotatably connects the base ends of a pair of first links to a vertical shaft that is provided to be able to rise and fall freely, and each of the first links The proximal ends of each of a pair of second links are rotatably connected to the distal end, and a pair of fork holders each rotatably supported on a horizontal axis is connected to the distal end of each second link. , each fork holder is provided with a pair of arcuate forks having substantially the same radius of curvature as the drum to be lifted, movable by one minute on the body of the drum, and each fork and each of the second links are connected to each other, A pair of telescopic parts are connected by a pair of telescopic parts that extend and contract to move the fork along the body of the drum, a movable body is provided on the vertical axis so as to be movable up and down, and the base end of the third link is rotated on this movable body. At the same time, the tip of the third link is rotatably connected to the horizontal shaft, and further, by engaging the moving body with the vertical shaft, the third link is connected to the lower end of the vertical axis of the moving body. An engaging portion is provided that restricts the movement and prevents the movable body from coming off the movable body, thereby allowing the movable body to move toward the lower end of the vertical axis.

"Function" In the drum hoist of the present invention, by extending the telescopic portion, the fork moves along the chest of the drum and wraps around the drum, and by raising the vertical axis,
As the proximal ends of the pair of first links connected to this link rise, the distal ends thereof rotate and approach each other, and the proximal ends of the pair of second links connected to the distal ends thereof move toward each other. The fork holders rotate and approach each other, and as a result, the tips of the second link rotate upwards about the horizontal axis, and as a result, the tips of the fork holder approach each other using the horizontal axis as a fulcrum. The forks rotate toward each other, press against the body of the drum, wrap around it, and clamp it.Furthermore, by raising the vertical shaft, the weight of the drum is reduced. Since the forks are actuated in a direction to bring them closer to each other through the link and the fork holder, thereby obtaining a gripping force for gripping the drum, it is possible to grip and lift the drum more safely and reliably.

Also, after wrapping the body of the drum with a fork,
When the engaging part is removed from the movable body, the movable body does not rise as the vertical axis rises, and therefore, before the fork comes into pressure contact with the body of the drum, the fork is connected to the movable body and supports the fork holder. Since the horizontal shaft that is attached to the drum does not rise, the fork does not rise and fail to grip the drum, and
Since the fork rises after being pressed against the drum, it is possible to reliably grip drums with slightly different diameters.

"Embodiment" An embodiment of the drum hanging tool of the present invention will be described below with reference to FIGS. 1 to 6.

In these figures, the symbol IO indicates a frame. This frame I
O is provided so that it can travel, traverse, and rise and fall freely from a wire rope let out from a club trolley (not shown) or the like.

Further, on both the left and right sides of the frame 10 in FIG. 1, guide rollers 11 are provided which rotate and slide against the wall surface to guide the vertical movement of the frame 10 when the frame 10 is raised and lowered along the wall surface. +1 is rotatably attached.

Eight mounting shafts 12 are mounted on the wall 10a of the frame lO.
are mounted at equal intervals in the horizontal direction, and as shown in FIG. 2, a cylindrical anti-vibration rubber I3 is brought into contact with the upper end of each mounting shaft 12. Each mounting axis I2
A vertical shaft I5 is connected to the lower end of the vertical shaft I5, and a cylindrical rubber buffer 17 is provided between the flanges 16, 16 located at this connecting portion.

As shown in FIGS. 3 and 4, a support member 18 is loosely inserted into the upper end of the vertical shaft 15, and is supported by a boss 18a fixed directly below the support member 18 so that it cannot be lowered and is swingable. There is. A connecting fitting I9 is rotatably attached to this support member 18. The proximal ends of a pair of first links 20.20 are rotatably connected to the connecting fitting 19, and the proximal ends of a pair of second links 22.22 are connected to the distal ends of the first links 20.20. The parts are rotatably connected.

Each first link 20 includes a rod 20a connected to the connecting metal fitting 9, a rod 20b connected to the second link 22, and an adjustment nut that screws into the threaded portions of these rods 20g and 20b to connect them. It is composed of 20c,
The length of the first link 20 is adjusted by this adjustment nut 20c.

Two legs 22a, 22b are formed at the tip of each of the second links 22, 22, and each leg 22a, 22b has an arc shape with approximately the same radius of curvature as the drum to be lifted. Sheath-like fork holder 24
．． The central and rear end portions of 24 are connected to each other. Each fork holder 24 is provided with a fork 25 movable along the body of the drum. That is,
The fork 25 includes an arc-shaped slide member 26 that is movably inserted into the fork holder 24 from its tip opening along the body of the drum, and an arc-shaped slide member 26 provided at the tip of the slide member 26. As the slide member 26 moves, the fork claws 27 move along the body of the drum.

A pair of hydraulic cylinders (extensible parts) 30.30 are arranged between the fork 25.25 and the second link 22.22 so as to intersect with each other.

The cylinder body 30a of this cylinder 30 is connected to the second link 2
It is rotatably connected to the base end of cylinder shaft 3.
0b is rotatably connected to the tip of the slide member 26 of the fork 25. By expanding and contracting the cylinder shaft 30b, the fork 25 is moved along the body of the drum. In addition, the cylinder 30
The hydraulic unit U that operates the wall of the frame lO
Eight sets are provided in b. (See Figure 1) Furthermore,
The center portions of the pair of fork holders 24, 24 each have a horizontal axis 3 perpendicular to the vertical axis 15! It is rotatably supported. As shown in FIG. 5, a ring 32 having a flat surface on its outer periphery is fixed to the horizontal shaft 31, and the flat surface of this ring 32 has an engaging portion formed at the lower end of the vertical shaft 15. 33 are engaged in a vertically slidable manner.

Further, as shown in FIG. 5, a movable body 35 is provided on the vertical shaft 15 located below the boss 18a so as to be movable up and down with a slight gap between it and the boss 18a.

Connecting fittings 36.36 are rotatably attached to both ends of the moving body 35 in the horizontal direction, and base ends of third links 37.37 are rotatably attached to the connecting fittings 36.36, respectively. freely connected. This third link 3
The lower end of 7.37 is rotatably connected to the horizontal shaft 31. (See FIG. 6) Furthermore, as shown in FIG. 6, a recess 38 is formed in the lower end surface of each third link 37, and a contact plate 39 that contacts the drum can K is formed therein. A hole 39a is provided to match the recess 38. A proximity switch 40 for stopping lowering is provided in this recess 38 so as to face the body of the drum.

Further, as shown in FIG. 5, the vertical shaft 15 located below the movable body 35 is engaged with the movable body 35 to prevent the movable body 35 from moving toward the lower end of the vertical shaft 15. A cam (engaging portion) 42, 42 is provided that restricts the movement of the moving body 35 and allows the moving body 35 to move toward the lower end of the vertical shaft 15 by coming off the movable body 35.

That is, below the movable body 35, a fixed plate 45 is fixed to the vertical shaft 15 with a predetermined distance between it and the movable body 35. A pair of cams 42.42 are rotatably provided on the fixed plate 45 via a rotating shaft 46.46. These cams 4242 are rotated as follows. Furthermore, a pair of thrusters 48, 48 are provided at the longitudinal center of the frame 10, as shown in FIGS. 1 and 2. The central part of a link 49 is rotatably connected to the lifting shaft 48a of each thruster 48, and the lower end of one end of this link 49 is rotatably connected to the wall 10b of the frame IO. It is rotatably connected to the upper end of the link 50. On the other hand, link 49
The upper end of a link 51 that vertically moves through the wall lOb is rotatably connected to the other end, and the lower end of this link 51 has a link 51 that extends in the longitudinal direction of the frame lO. One end of a rotating member 52 supported by a rotating shaft 52a is rotatably connected. One end of a link 53 is connected to the other end of this rotating member 52.
The other end is connected to the cam 42. Further, a flange 51a is fixed to the lower end of the link 51, and a coil spring 55 is provided between the flange 51a and a plate 54 provided on the lower surface of the wall 10a. And, the elevating shaft 48a of the thruster 48
By raising the link 5I becomes the link 49°5
0, and rises against the force of the coil spring 55, and with this rise, the rotating member 52 rotates about the rotating shaft 52a, thereby causing the link 53 connected to the rotating member 52 to rotate. The cam 42 rotates about the rotating shaft 46 as a fulcrum.

In addition to the proximity switch 40 for stopping lowering, the drum hoist having the above structure is provided with the following proximity switch. That is, as shown in FIG. 4, L-shaped metal fittings 55 and 55 are attached to both ends of the horizontal shaft 31 to prevent the drum from moving in the axial direction. Proximity switch 5 for lowering deceleration
6 is installed. Also, as shown in Figure 5,
A proximity switch 57 for detecting landing of the drum is provided on the boss 18a provided on the vertical shaft 15.

Next, a method for hoisting a drum using the drum hoist having the above structure will be described.

First, the frame IO is rolled up and lowered from the top dead center at high speed.

When the frame body 10 descends and the metal fitting 55 descends to a position very close to the drum can K, a proximity switch 56 for lowering deceleration provided on the metal fitting 55 senses this and lowers the lowering speed. Furthermore, when the frame lO descends at this low speed, the contact plate 39 provided on the lower end surface of the third link 37
comes into contact with the body of the drum, which is detected by the proximity switch 40 for stopping lowering, and the lowering of the frame 10 is stopped. Note that during the above operation, the cylinder 30.30 for moving the fork 2525 is in a retracted state, and the cam 42.42 is in a closed state. Furthermore, when the contact plate 39 contacts the drum K, the movable body 35 is slightly raised via the third link 37, creating a slight gap between it and the cams 42 and 42.

Next, the cylinder shaft 30b of the cylinder 30.30 is extended. Then, the slide members 26.26 in the fork holder 24°24 rotate in opposite directions about the axis of the drum, and the fork claws 27.27 provided at the tips of these slide members 26.26 move against the drum. rotates along the body of the As a result, the body of the drum is wrapped around the fork claws 2727. At this time, there is a slight gap between the fork claws 27, 27 and the body of the drum.

Next, the cams 42, 42 are opened by actuating the thruster 48, allowing the movable body 35 to move toward the lower end of the vertical shaft 15. Then, by winding up the frame 10 at a low speed, the vertical shaft 15 is raised. Then, since the movable body 35 is movable toward the lower end of the vertical axis 15, the movable body 35 remains stationary even if the vertical axis I5 rises to a certain extent. Horizontal axis 3 connected! has also stopped. Therefore, this horizontal axis 3
The fork holder 24 supported by 1 is at rest.

On the other hand, as the vertical axis I5 rises, each of the base ends of the first links 20.20 connected thereto rises, and accordingly, each of the distal ends rotates and approaches each other. The proximal ends of the connected second links 22.22 rotate toward each other. Accordingly, the leg 22b at the tip of the second link 22.22.

22b rotates upwards about the horizontal shaft 31, thereby causing the fork holders 24.24 to rotate about the horizontal shaft 3I in a direction in which their tips approach each other, and the fork claws 27.27 move horizontally. They are rotated about the shaft 31 as a fulcrum so as to approach each other, and are pressed into contact with the body of the drum and are sandwiched so as to wrap around it. Furthermore, when the drum K is lifted off the floor by raising the vertical shaft 15, the drum's own weight is transferred to the fork 25.2 via the link and the fork holder 24.24, like tongs used for transporting ice, etc.
5 to move them closer to each other, and the drum can K is further clamped and gripped by the fork claws 27 and 27 at the tips thereof.

After the frame 10 is rolled up at a low speed to a predetermined position, it is rolled up at a high speed to the top dead center.

Note that the hoisting speed is switched by a hoisting encoder.

In addition, in order to lower the lifted drum K, the frame lO
is lowered in the order of high speed and then low speed, and the drum can K is placed on the floor.

When the drum K lands on the floor, the movable body 35 approaches the boss 18a by lowering the vertical shaft 15 via the third link 37 provided with the contact plate 39, and the proximity switch 57 detects this and lowers the drum. Stop.

Then, after closing the cam 42.42, the cylinder 30.3
0 cylinder shafts 30b, 30b are shortened and the fork claws 27
．． 27 are rotated along the body of the drum in a direction away from each other, the grip on the drum is released, and the frame 10 is raised at high speed.

According to the drum hanging tool, the fork 2 has an arc shape.
Since the fork claws 27 and 27 of 5.25 are used to grip the drum in a manner that wraps around the body of the drum, the drum can be gripped and lifted more safely than the conventional method that grips the top and bottom plates. be able to.

In addition, the first link 2 is attached to the vertical shaft I5 which is provided so as to be able to rise and fall freely.
0.20, a second link 22.22 is connected to this first link 20.20, a fork holder 24.24 is connected to this second link 22.22, and this fork holder 24, 24J is connected to a drum can. A fork 25.25 having an arcuate shape with substantially the same radius of curvature as the drum is movably provided along the body of the drum, and the fork 25.25 and the second link 22.22 are connected by a cylinder 30.30. Therefore, due to the expansion of this cylinder 30.30, the fork 25.25
Move along the body of the drum and wrap around the body, vertical axis! 5, the dead weight of the drum is applied to the forks 25 and 25 in a direction that brings them closer to each other, like tongs used for transporting water, etc., through the link mechanism as described above. Since the gripping force is obtained, there is no need for a drive source to grip the drum K, and a vertical axis! The drum can K can be reliably gripped by simply raising the handle 5.

Further, a movable body 35 is provided on the vertical shaft 15 so as to be movable up and down, and is engaged with the movable body 35 to restrict the movement of the movable body 35 toward the lower end of the vertical shaft 15, and also moves off the movable body 35. A cam 42.42 is provided to allow the movement of the vertical axis I5 of the body 35 toward the lower end side, and a third link 37 is connected to the movable body 35, and a fork holder 24°24 is connected to the third link 37. After connecting the horizontal shafts 31 to be connected and wrapping the body of the drum with the forks 25.25, the cams 42.42 are removed from the movable body 35 so that the movable body 35 does not rise as the vertical shaft 15 rises. So, before the fork 25.25 comes into pressure contact with the body of the drum,
The fork 25.25 does not rise and fail to clamp the drum can K, and the fork 25.25
Since it rises after being pressed into contact with the drum, it is possible to reliably grip and lift even drums with a slightly larger diameter.

"Effects of the Invention" As explained above, according to the drum hoist of the present invention, a pair of first links are connected to a vertical shaft provided so as to be able to rise and fall freely, and a pair of second links are connected to each first link. A pair of fork holders are connected to each second link, and each fork holder is provided with an arc-shaped fork having approximately the same radius of curvature as the drum, movable along the body of the drum. The fork and each second link are respectively connected by a pair of telescopic parts, and the fork is moved along the body of the drum by expansion of the telescopic part, wraps around the body, and raises the vertical axis. The body of the drum is clamped and gripped through a link mechanism such as this, and the weight of the drum is applied to the fork in the direction of bringing them closer to each other, similar to tongs used for transporting ice, etc. Since the grip force is obtained by
Compared to the conventional device that clamps the top plate and the bottom plate, the drum can be gripped and lifted more safely, and the drum can be reliably gripped and lifted simply by raising the vertical shaft.

In addition, a movable body is provided on the vertical axis so as to be movable up and down, and the movable body is engaged with the movable body to restrict the movement of the movable body toward the lower end of the vertical axis. An engaging part is provided to enable side movement, and a third link is connected to the movable body, a horizontal shaft connecting a fork holder is connected to this third link, and the body of the drum is wrapped around the fork. After that, the engaging part was removed from the moving body to prevent the moving body from rising as the vertical axis rose, so the fork rose and clamped the drum before the fork came into pressure contact with the body of the drum. Moreover, even drums with a slightly larger diameter can be gripped reliably.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the drum hanging tool of the present invention, FIG. 1 is a front view of the drum hanging tool, and FIG. 2 is a view taken along A-A and B in FIG. 1. -B line view, Figure 3 is a front view showing the main parts of the hanging tool, Figure 4 is a side view of the same, Figure 5 is a front view of the main parts showing the cam, and Figure 6 shows the third link. FIG. 7, which is a front view of the main parts, is an explanatory diagram illustrating a conventional method for lifting drums. K...Drum can, 15...Vertical shaft, 2
0...First link, 22...Second link, 24...Fork holder, 25...
・Fork, 30...Cylinder (extendable part), 3
! ...Horizontal axis, 35...Moving object, 37
...Third link, 42...Cam (engaging part).

Claims (1)

[Claims] The proximal ends of a pair of first links are rotatably connected to a vertical shaft that can be raised and lowered, and the base ends of each of a pair of second links are rotatably connected to the distal end of each first link. connected to,
A pair of fork holders each rotatably supported on a horizontal axis are connected to the tip of each second link, and each fork holder is connected to a pair of forks having an arc shape with approximately the same radius of curvature as the drum to be lifted. are movable along the body of the drum, and each fork and each of the second links are connected by a pair of extendable parts that extend and contract to move the fork along the body of the drum to be lifted. and a movable body is provided on the vertical axis so as to be movable up and down, the base end of the third link is rotatably connected to the movable body, and the distal end of the third link is rotatably connected on the horizontal axis. connected, and further to the vertical axis,
An engaging portion is provided that engages with the movable body to restrict the movement of the movable body toward the lower end of the vertical axis, and when disengaged from the movable body enables the movable body to move toward the lower end of the vertical axis. By raising the vertical shaft, the drum can's own weight is applied to the fork via the link and link holder, so that the fork wraps and holds the body of the drum. Hanging equipment for drums.