JPH0454919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drum positioning device, and more particularly to a device for accurately positioning a lid fastener when opening a drum can.

Facilities that handle radioactive materials such as nuclear power plants generate large amounts of flammable miscellaneous solid waste such as cloth, paper, and plastics, as well as radioactive waste such as waste resin, and storage of these wastes and their incinerated ash is necessary. for
200 open type drums are widely used. This drum is constructed by placing a lid (outer lid) over the opening at the top end, surrounding the lid and the body curl at the top end of the drum with an elastic metal band having a V-shaped cross section, and A structure is used in which the lid is held in a sealed state by a tightening band that is tightened with a bolt or lever. When storing the above-mentioned waste in this drum or taking out the waste from the drum for incineration or solidification, it is necessary to open and close the lid by operating the above-mentioned tightening band and attaching and detaching the lid to the drum. However, in the past, the operation of the tightening band and the opening and closing of the lid had to be done mostly manually, which posed a problem as there was a risk of radiation exposure to the workers. In addition, in order to automatically loosen the bolts for tightening the tightening band using a mechanical device and open the lid, it is first necessary to accurately position the drum, especially the position of the tightening bolts. Because there was no suitable device for this, it was difficult to put the drum lid opening/closing device into practical use.

This invention was made in view of the above points, and it is possible to accurately position the fasteners at both ends of the drum lid tightening band, and it is possible to automate the opening and closing of the drum can lid, thereby saving labor. An object of the present invention is to provide a drum positioning device that can improve work safety in the case of drums storing hazardous materials such as radioactive materials.

However, the gist of the present invention is to provide a drive roller conveyor for conveying drums in an upright state, a guide for preventing the drums from shifting laterally, and a movement position detector for detecting when the drums have been conveyed to a predetermined position. A conveying device equipped with a conveyor, and a plurality of free rollers protruding from a lifting platform provided below the rollers of the drive roller conveyor that can be raised and lowered freely, and arranged between the rollers and facing the bottom surface of the drum can. a lifting support device, a roller that is attached to the tip of a pair of levers that are pivotally connected to the pedestal and driven to rotate in opposite directions and engages with the body of the drum, and a pedestal that can move toward and away from the body of the drum. an alignment device consisting of a rotary drive device with a drive roller attached to the shaft of a motor supported by a motor; A drum can positioning device comprising: a fastener detection device having a pair of detectors mounted opposite to the tool, and a fastener detection device equipped with a drive machine for rotating the arm.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in the first diagram, a conveying device 3 consisting of a driving roller conveyor for conveying drums 2 in an upright state is installed on the foundation 1, and a pedestal 4 is erected on the foundation 1 to straddle this conveying device 3. has been done. An elevating support device 5 for elevating and lowering the drum can 2 and supporting it rotatably around a vertical axis is installed approximately at the center of the installation portion of the pedestal 4. A lifting platform 6, which constitutes the main body of the lifting support device 5, is provided below the rollers 3a of the conveying device 3, and supports a frame 8, which is guided by guide rods 7 erected on the foundation 1 so as to be able to rise and fall freely at its four corners. It is raised and lowered over short distances by a lifting drive device 9 such as a cylinder, and a free roller 11 made of a rotatable ball or caster is attached to the upper end of a support rod 10 protruding from the upper surface of the frame 8. 12 is the conveyance device 3
This is a guide plate fixed to the frame 3b of the drum 2, and is provided to prevent the drum 2 from shifting laterally. Further, reference numeral 13 denotes a moving position detector attached to the frame 4 on both sides of the transport device 3, which is a phototube type detector consisting of a light emitter 13a and a light receiver 13b. On the other hand, an alignment device 15 and a rotation drive device 16 are provided on the pedestal 4 at a position on the side of the drum can 2 . The alignment device 15 is a second
As shown in the figure, levers 18 and 19 with rollers 17 at their tips are pivotally mounted on the frame 4, and both levers 1
Sector gears 20, 21 fixed to the bases of 8, 19
The two levers 18 and 19 are interlocked with each other by an air cylinder 22 to rotate in opposite directions. Also, the rotational drive device 16
As shown in the first figure, a slide plate 24 to which a drive roller 23 is rotatably attached is supported on a pedestal 4 so as to be slidable toward the center of the drum can 2, and the slide plate 24 is driven back and forth by an air cylinder 25. , is a device in which a drive roller 23 is rotationally driven by a motor 26 attached to a slide plate 24. Note that this rotary drive device 16 forms a part of a centering device 15 that performs centering of the drum can 2. Further, a fastener detection device 27 is provided on the pedestal 4 at a position corresponding to the upper part of the drum can 2 . This fastener detection device 27 detects fasteners 33a and 33b (generally referred to as fasteners 33. The same applies to other parts) at both ends of the lid tightening band 32 for attaching the lid 31 of the drum can 2. Two fasteners 33a are attached to the tip of the arm 28 whose base is pivotally connected to the pedestal 4.
Detectors 29a and 29b, each consisting of a proximity switch, are mounted opposite the arms 29 and 33b, and the arm 28 is driven to reciprocate and swing by an air cylinder 30. The lid tightening band 32 is made by fixing the fasteners 33a and 33b whose lower part is rounded into a cylindrical shape to both ends of an elastic metal band 35 having a V-shaped cross section, and fixing it to one of the fasteners 33b. This is of a known construction in which a bolt 37 inserted through the other fastener 33a is screwed into a nut 36 and tightened.
Also, on the top of the pedestal 4, there is a nut runner that can be raised and lowered to rotate the bolt 37, and a lid tightening band 32.
An arbitrary lid opening/closing device 40 (details not shown) including a holder for the lid 31 and the like is provided.

In order to position the drum 2 using the drum positioning device 38 having the above structure, first the rollers 17, 23 and the detector 29 are placed in the retracted position shown by the chain lines in FIG. Guide plate 12
The drum can 2 is transported by the transport device 3 while regulating the amount of lateral displacement of the drum can 2, and the position detector 1
3, the drum can is detected and the conveyance device 3 is stopped, and the drum can 2 is stopped at a predetermined position below the lid opening/closing device 40. Next, the drum can 2 is raised by about 10 mm from the upper surface of the roller 3a by the lifting support device 5, and at this position, the drive roller 23 is projected toward the drum can 2 by the air cylinder 25, and both levers 18 and 19 are moved by the air cylinder 22. Rotate in the direction of arrow X to align the drum 2. At this time, the tightening tool 33 of the lid tightening band 32 is
It is located at an arbitrary circumferential position different from that shown in the second diagram. Next, the arm 28 is rotated in the direction of arrow Y by the air cylinder 30 to move the detector 29 to a position close to the body of the drum can 2, and the motor 26 is operated to move the drum can 2 around the vertical axis by the drive roller 23. Rotate at low speed. When the fasteners 33a and 33b approach the detectors 29a and 29b, respectively, and reach the state shown in the second figure, the motor 26 is stopped by the output signals of these detectors, and the positioning of the drum can 2 is completed. This positions the fasteners 33a and 33b and therefore the bolt 37, so that the bolt 37
The lid tightening band 32 and the lid 31 can be opened and closed by mechanically operating the lid opening/closing device 40. In the above, since the drum 2 is supported on the free roller 11, the drum 2 moves and rotates smoothly. When conveying the drum can 2 again, each roller 17, 23 and the detector 29
What is necessary is to return it to its original retracted position, lower the lifting support device 5, and restart the conveying device 3.

In the present invention, as the detector 29 for detecting the fastener 33, something other than a proximity switch such as a limit switch may be used.

The above description has been made of the case where the present invention is applied to a drum can positioning device using a bolt-type lid tightening band, but this invention also applies to a drum can positioning device using a lever-type lid tightening band 50 shown in FIG. It can also be applied to positioning devices. As shown in the figure, a lever 53 and a link 54, which are pivoted to each other, are respectively pivotally connected to fasteners 52a and 52b fixed to both ends of a band 51 having a V-shaped cross section. The fasteners 52a and 52b may be detected by the detectors 29a and 29b.

As explained above, according to the present invention, a drum can that has been conveyed with the fastener of the lid fastening band facing in an arbitrary direction can be automatically and accurately positioned by directing the fastener in a predetermined direction. Because it is possible to
By making it possible to automate the opening and closing of drum lids, it is possible to save labor and improve the safety of handling drums that contain hazardous substances such as radioactive waste. In particular, when the drum is supported on the free roller of the lifting support device, lateral movement during alignment and rotational movement during fastener detection are performed, so the driving force for these movements and rotations is It can be small, and the prime movers such as motors and air cylinders for driving various parts of the aligning device can be small and small in capacity.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of a drum positioning device showing an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 4 FIG. 2 is a perspective view of main parts showing another type of drum can to which the present invention is applicable. 3... Conveyance device, 5... Lifting support device, 6... Lifting platform, 9... Lifting drive machine, 11... Free roller, 12
... Guide plate, 15 ... Alignment device, 16 ... Rotation drive device, 17 ... Roller, 18 ... Lever, 19 ... Lever, 22 ... Air cylinder, 23 ... Drive roller, 2
4... Slide plate, 25... Air cylinder, 26... Motor, 27... Fastener detection device, 28... Arm, 3
0... Air cylinder, 32... Lid tightening band, 33
a, 33b... tightening tool, 38... drum positioning device, 50... lid tightening band, 52a, 52b... tightening tool.

Claims (1)

[Scope of Claims] 1. A conveyor equipped with a drive roller conveyor that conveys drums in an upright state, a guide for regulating the drums from shifting laterally, and a movement position detector that detects when the drums are conveyed to a predetermined position. and an elevating support device comprising a plurality of free rollers disposed between the rollers and protruding from a platform provided below the rollers of the drive roller conveyor that can be raised and lowered freely. a roller attached to the tips of a pair of levers pivoted to the pedestal and driven to rotate in opposite directions and engaged with the body of the drum, and a roller supported by the pedestal so as to be able to move toward and away from the body of the drum An alignment device consisting of a rotary drive device with a drive roller attached to the shaft of a motor, and a centering device consisting of a rotary drive device with a drive roller attached to the shaft of the motor, and a centering device that is attached to the tip of an arm pivotally connected to the above-mentioned frame and facing the fasteners at both ends of the lid fastening band of the drum can. A drum can positioning device comprising: a fastener detection device having a pair of detectors attached to the arm; and a fastener detection device equipped with a drive machine for rotating the arm.