JPH0223838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for decontaminating radioactive solid waste such as piping generated in nuclear power plants and the like.

In general, radioactive waste generated at nuclear power plants, etc. is required to be disposed of with its radioactivity level as low as practicably possible, but solid waste with large dimensions such as piping, flanges, or cylindrical blocks must be disposed of. cannot be disposed of by undergoing volume reduction treatment or the like. Therefore, in the case of solid waste as described above, conventionally, radioactive materials such as radioactive corrosion products and nuclear fission products adhered to the internal and external surfaces of the solid waste have been decontaminated by removing them using polishing brushes or electropolishing. The purpose of disposing of it as general waste had been achieved.

However, conventional decontamination equipment has a problem in that it cannot accurately and efficiently decontaminate a wide range of radioactive solid wastes of different shapes, sizes, and types.

The present invention provides a radioactive solid waste decontamination device that can efficiently, accurately, and safely decontaminate various radioactive solid wastes of different shapes, sizes, and types, and with high precision and without waste. The purpose is to

In order to achieve the above object, the present invention provides a decontamination device that holds and rotates radioactive solid waste to remove the surface of the radioactive solid waste.
holding and rotating means for holding and rotating one end of the radioactive solid waste; outer surface removing means for removing the outer surface of the radioactive solid waste; and inner surface removing means for removing the inner surface of the radioactive solid waste. means and
a discharge means provided integrally with the inner surface removal means and for discharging the removed material removed by the inner surface removal means from inside the radioactive solid waste; A feed drive means for moving the waste along and a rotary drive means simultaneously move a plurality of shafts toward the rotation center axis of the radioactive solid waste through gears to hold the rotation center axis of the radioactive solid waste. The apparatus further includes steady rest means for supporting the radioactive solid waste so as to coincide with the center of rotation of the rotating means.

Hereinafter, the present invention will be explained in detail based on the drawings.

1 to 19 show one embodiment of the present invention, and in the figures, numeral 1 indicates radioactive solid waste such as piping (hereinafter referred to as the object to be cut). The decontamination device of the present invention decontaminates the object 1 by cutting the inner and outer surfaces of the object 1. As shown in the overall view in FIG. A conveying device A and a loader B are used to transport the workpiece to a predetermined position, and a holding and rotating device (holding and rotating means) C, which holds and rotates the workpiece 1 as a main unit, and a main body unit that holds and rotates the workpiece 1, and a main unit that holds and rotates the workpiece 1. a cutting unit (outer surface removing means) D that cuts the inner surface of the workpiece 1; a boring unit (inner surface removing means) E that cuts the inner surface of the workpiece 1;
A feed drive device (feed drive means) F for moving the cutting unit D and boring unit E along the workpiece 1 is provided. The above nuclear devices will be explained in order below.

(1) Conveyance device A The conveyance device A is used to supply the workpiece 1 to the decontamination equipment main body and to transport the workpiece 1 after cutting to a predetermined location, as shown in Figure 4. , an incoming conveyor 2, a reversing device 3, and an outgoing conveyor 4.

The carry-in conveyor 2 is a self-propelled conveyor that conveys the workpiece 1 to the reversing device 3 with its longitudinal direction aligned with the direction of movement.

Further, the reversing device 3 rotates the workpiece 1 sent from the carry-in conveyor 2 in a predetermined direction, reverses the workpiece 1 in the middle of cutting, or rotates the workpiece 1 that has been cut completely. It is used to orient an object 1 in a predetermined direction, and its basic structure is as follows. That is, a plurality of supports 7 each having a stroke bearing 6 on the upper part are provided at predetermined positions of a horizontal base 5 on the floor surface, and on these supports 7 there is provided a circular ring band shaped like a disk and close to the periphery. A turntable 9 is provided with annular rails 8 concentrically,
It is supported horizontally with its rail 8 facing downward and in contact with the bearing 6 of the support 7. Further, a rotating shaft 10 having a large diameter portion 10a and a small diameter portion 10b is provided vertically at the center of the lower surface of the turntable 9, with the large diameter portion 10a facing the lower surface of the turntable 9, and
The small diameter portion 10b of the rotating shaft 10 is attached to a bearing 12 on a bearing stand 11 provided on the base 5.
It is rotatably attached via the A sprocket wheel 13 is horizontally attached to the large-diameter portion 10a of the rotating shaft 10, and a drive sprocket wheel 14 paired with the sprocket wheel 13 is disposed on the side of the sprocket wheel 13. At the same time, an endless chain 15 is wound between the pair of sprocket wheels 13 and 14. Furthermore, the drive sprocket wheel 1
4 is connected to a turntable drive motor 17 with a brake via a reducer 16, and the rotational power of the turntable drive motor 17 is transmitted to the rotating shaft 10 via the reducer 16 etc. The table 9 is configured to rotate in a horizontal plane around its center.

Further, a support stand 18 having support parts 18a, 18a on both sides is provided on the upper part of the turntable 9, and a pair of pedestals 19, 19 for receiving the workpiece 1 are placed on the support stand 18. is placed. This pair of pedestals 19, 19
each has a length approximately equal to the diameter of the turntable 9, and a downwardly inclined receiving surface 19.
a, 19a, and the turntable 9
The receiving surfaces 19a, 19a are arranged to be appropriately spaced approximately in the center thereof and to face each other in parallel to form a horizontally elongated receiving part with a V-shaped cross section. In order to adjust the receiving width w of the object 1, the receiving stand 19,
A pair of receiving width adjustment mechanisms 20, 20 are attached at a distance from each other in the longitudinal direction of 19. Each of the receiving width adjustment mechanisms 20 has a screw shaft 21 having a right-handed threaded portion on one side 21a, which is screwed through one side 21a into one holder 19 in the width direction of the holder 19. The other side 21b is
A screw shaft 22 is provided so as to be rotatably supported by penetrating one support portion 18a of the screw shaft 22a, and has a left-hand threaded portion on one side 22a. 22a is screwed through the other pedestal 19 and the other side 22
b penetrates the other support portion 18a of the support base 18 and is rotatably supported, and each one side 2 of the pair of screw shafts 21 and 22
1a and 22a are connected to each other by a coupling 23. Then, by turning the handle 24 attached to the other side 21b, 22b of each screw shaft 21, 22, the above-mentioned pedestal 1
9 and 19 move along screw shafts 21 and 22, respectively, so that the receiving width w is adjusted.

On the other hand, the carry-out conveyor 4 has the same structure as the carry-in conveyor 2 described above, is arranged on the same line as the carry-in conveyor 2, and carries the cut workpiece 1 from the reversing device 3 to a predetermined location. This is a self-propelled conveyor.

In addition, above the reversing device 3, there is a reversing device 3.
An extrusion device 25 is installed to extrude and transfer the upper workpiece 1 onto the carry-out conveyor 4. FIG. 6 shows this extrusion device 25, which includes an extrusion arm 26 that pushes one end of the workpiece 1 on the reversing device 3 in a predetermined direction, an arm holder 27 that holds this extrusion arm 26, and this arm holder 27. a pneumatic or hydraulic actuating cylinder 28 that is attached to the arm holder 2 and raises and lowers the pushing arm 26;
It is comprised of a pneumatic or hydraulic telescopic cylinder 29 and a telescopic guide 30 for reciprocating the telescopic cylinder 7 as shown by arrow a in the figure. Here, the telescopic cylinder 29
The telescopic guide 30 has an outermost cylinder portion 29a and a guide portion 30a.
is supported by a pedestal 31 provided on the floor, while its innermost rod portion 29b and sliding portion 30b are attached to the arm holder 27.

(2) Loader B Loader B transports the workpiece 1 on the reversing device 3 to the main body of the decontamination device, and transfers the workpiece 1 in the middle of cutting or the workpiece 1 after cutting to the reversing device 3. As shown in FIGS. 1 and 7, both ends 5 of
1a and 51b are supported and movably attached to a horizontally provided guide rail 51, and can be freely moved along this guide rail 51 by a required drive mechanism. In other words, both ends 51 of the guide rail 51
A pair of sprocket wheels 5 at 51b
A chain 54 is wound around these sprocket wheels 52 and 53, and a loader moving motor 55 equipped with a brake is connected to one of the sprocket wheels 53. The loader B is attached to the chain 54 and is moved along the guide rail 51 by the loader moving motor 55.

8 and 9 show details of this loader B, including a carrier 56 that moves along the guide rail 51, and a pair of left and right loading arms that are attached to the carrier 56 and are moved up and down. 57, 57, and each pair of clamp claws 58, 58 attached to the lower ends of these loading arms 57, 57, respectively.
and claw opening/closing devices 59, 59 for opening and closing the pair of clamp claws 58, 58, respectively.

A rail groove 56a is provided on the back of the carrier 56.
is formed, and the guide rail 51 is inserted through the rail groove 56a, and a rail portion 51f provided on the upper and lower surfaces of the guide rail 51 is formed on the inner upper and lower surfaces of the rail groove 56a. A pair of main rollers 56b, 56 that are rotated by
b, and a pair of auxiliary rollers 56c, 56c that roll on the upper and lower parts of the side surface 51c on one side of the guide rail 51, respectively. The system allows for accurate and smooth movement.

The loading arms 57, 57 are attached to the carrier 56 by a combination of a rack 60 and a pinion gear 61 so as to be able to move up and down. That is, the loading arm 57,
57 is provided with racks 60, 60 in the vertical direction, and pinion gears 61, 61 are engaged with these racks 60, 60, respectively.
It is attached to an arm vertical movement shaft 62 rotatably supported by the carrier 56 via a bearing. The arm vertical movement shaft 62 is moved through a chain transmission mechanism consisting of a pair of sprocket wheels 63 and 64 and a chain 65.
It is designed to be rotationally driven by an arm vertical movement motor 66 provided on the carrier 56.

The clamp claws 58, 58 are provided in pairs at the lower ends of the loading arms 57, 57, and have a sector gear portion 58a on one side,
58a is rotatably attached to the loading arm 57 by pins 58b, 58b, and a clamp jaw 58 is attached to the lower end thereof.
c, 58c are rotatably attached via pins 58d, 58d. Further, the pawl opening/closing devices 59, 59 include a threaded rack 59a that is engaged with the sector gear portions 58a, 58a of the clamp pawls 58, 58 to rotate the clamp pawls 58, 58, and a screwed rack 59a that is screwed into the screwed rack 59a. Clamp screw shaft 5 that moves it up and down
9b, and a pawl opening/closing motor 59d which is connected to this clamp screw shaft 59b via a coupling ring 59c and rotates the same, and is integrally incorporated into the loading arms 57, 57 via a sleeve 59e etc. as appropriate. It is.

(3) Holding and Rotating Device C The holding and rotating device C holds the workpiece 1 carried by the loader B in a predetermined state and rotates it. FIG. 10 shows the configuration of this holding and rotating device C.
a chuck 70 for tightening and fixing one end 1a of the
Spindle 7 that rotates this chuck 70
1, and the spindle 71 is connected to this spindle 71 via a transmission mechanism 72 such as a series of gears.
and a variable speed motor 73 that rotationally drives.

The spindle 71 is rotatably supported by a headstock 75 provided on a pedestal 74, as shown in FIG. Also, check 7 above.
0 is arranged to hold and rotate the workpiece 1 in the state shown by b in FIG. 1, and its tightening operation is performed by a rotating cylinder 76 via a connecting rod (not shown).

Note that here, the rotation cylinder 76 is activated by a hydraulic unit (not shown). Also,
As is clear from FIG. 10, in this embodiment, the power of the holding and rotating device C is also transmitted to the feed drive device F, which will be described later.

(4) Cutting unit D The cutting unit D is mainly used to cut the outer surface of the workpiece 1 whose one end 1a is held by the holding and rotating device C and rotated at a predetermined speed as shown in b in Fig. 1. , cutting tool 80
and the tool rest 81 to which this cutting tool 80 is attached.
Then, move this tool rest 81 up and down to set the cutting tool 8.
It consists of a dimension adjustment mechanism 82 that determines the position of zero and adjusts the amount to be cut.
The position of the cutting tool 80 is adjusted so that the tip of the cutting tool 80 comes into contact with the workpiece 1 from above and cuts the workpiece 1.

The tool rest 81 is slidably attached to a slideway 100a formed in conjunction with a table 100 that moves in the direction of arrow d in FIG. 1, so that it can move up and down. Further, as shown in FIG. 11, the dimension adjustment mechanism 82 includes a ball nut 81b provided vertically through the protrusion 81a of the tool rest 81.
A ball screw shaft 82b rotatably supported by the table 100 via a bearing 82a was screwed into the table 100, and a DC servo motor 82d was connected to the upper end of the ball screw shaft 82b via a pair of gears 82c. The structure is as shown above.
The tool rest 8 is controlled by the operation of the DC servo motor 82d.
1 is moved up and down along the ball screw shaft 82b.

A clutch 82 is connected to the gear 82c at the upper end of the ball screw shaft 82b via a gear 82e.
A handle 82g equipped with f is attached, and the clutch 82f is inserted and this handle 82g is attached.
The dimension adjustment mechanism 82 can also be operated by turning g. If the dimension adjustment mechanism 82 is hydraulic, the DC servo motor 82d may be a hydraulic servo motor, and the ball screw shaft 82b and ball nut 81b may be trapezoidal screws.

(5) Boring unit E Boring unit E is used to cut the inner surface of the workpiece 1, and is attached to a slideway 100b formed in series with the table 100, and rotates in the direction of arrow e in FIG. A sliding saddle 90, a boring bar 91 attached to this saddle 90, and a cutting tool 92 provided at one end 91a of this boring bar 91.
and a dimension adjustment mechanism 93 that moves the saddle 90 in the direction of arrow e to adjust the amount to be cut.

The dimension adjustment mechanism 93 has the same basic structure as the dimension adjustment mechanism 82 in the cutting unit D described above. That is, as shown in FIG. 12, a ball nut 90b is provided passing through the protrusion 90a of the saddle 90 in the left-right direction (direction of arrow e in FIG. 2), and the table 100 is connected to the ball nut 90b. A ball screw shaft 93b rotatably supported through a bearing 93a is screwed into the ball screw shaft 93b, and a DC servo motor 93d is connected to one end of the ball screw shaft 93b through a pair of gears 93c. A clutch 9 is attached to the other end of the screw shaft 93b.
A handle 93f is attached via the handle 3e. Then, by the operation of the DC servo motor 93d, the saddle 90 is automatically moved along the ball screw shaft 93b in the direction of arrow e in FIG.
3f, the above operation is performed manually.

Here, the method for making the dimension adjustment mechanism 93 hydraulic is the same as in the case of the cutting unit D.

(6) Feed drive device F The feed drive device F moves the table 100 to which the cutting unit C and boring unit D are attached in the longitudinal direction of the workpiece 1, that is, in the direction of arrow d in FIG. . The table 100 has a column 10 installed on the floor on the back side of the set workpiece 1.
1 pair of upper and lower slideways 101a, 10
1a so that it can slide freely.

The feed drive device F, as shown in FIG.
A nut 102 is provided to penetrate the protrusion 100c at the center of the table 100 in the left-right direction (direction of arrow d in FIG. 1).
A feed screw shaft 104 rotatably attached to the column 101 via a bearing 103 is screwed into the feed screw shaft 101, and a handle 107 equipped with a clutch 106 is connected to one end 104a of the feed screw shaft 104 via a pair of gears 105. is attached, and the other end 104b is configured to be connected to the shaft portion of the spindle 71 of the holding and rotating device C via a series of gear mechanisms 108, a clutch 109, and a transmission mechanism 110 such as a chain. When the clutch 109 is engaged and the holding/rotating device C is operated, the table 100 is sent along the feed screw shaft 104 to the left in FIG. 1, that is, in the forward direction in which cutting progresses. Further, in the gear mechanism 108, a reverse feed motor 112 equipped with a clutch 111 is connected to a gear 1.
13, and the clutch 1
09 and engage this clutch 111 to operate the reverse feed motor 112, the table 10
0 has a backward structure.

The feed drive device F can also be operated manually by engaging the clutch 106 and operating the handle 107. Also, table 100
To control the forward end, backward end, feed length, etc. of This can be done by attaching a limit switch to provide feedback on the rotation angle.

The basic configuration of the present invention is as described above, but in addition to the above-mentioned devices, the decontamination device of the present invention has two swings for preventing the workpiece 1 from swinging during cutting. It is equipped with stop devices G and H, and is designed to prevent troubles caused by chips after cutting. These will be explained below.

The steady rest devices G and H are slidably mounted on two slideways 120a of a base 120 provided below the set workpiece 1, and are moved in the direction of arrow d in FIG. One of the steady rest devices (steady rest means) G located on the side of the holding/rotating device C is such that the axis of the workpiece 1 to be cut is held and rotated by the holding/rotating device C. It functions to maintain the chuck 70 of the device C so that it is always aligned with the center of rotation, and
The other steady rest device H is for supporting the workpiece 1 against the cutting force exerted by the cutting unit D and the boring unit E.

FIG. 13 shows the steady rest device G,
In the figure, 121 is a roller 4 equipped with a roller 121a at its tip.
It's a book shaft. These shafts 121 are
A predetermined pitch is provided in the circumferential direction of the workpiece 1, and
The roller 121a is placed in contact with the circumferential surface of the workpiece 1 so as to roll on it, and
Two slideways 120 of the base 120 above
Steady rest main body 122 slidably attached to a
is incorporated into. Further, one of the shafts 121 is formed with a female thread in its longitudinal direction,
A screw shaft 123 is screwed into this female threaded portion, and a coupling 1 is attached to one end of this screw shaft 123.
24 to a drive device (rotary drive means) 125 such as a rotary actuator or a servo motor.
are connected to each other, and the operation of this drive device 125 causes the one shaft 121 to be pushed out in the axial direction of the workpiece 1 under a predetermined pressure. Further, a rack portion 12 is provided on the outer periphery of the one shaft 121 and the outer periphery of the other shaft 121.
1b is formed, and between each rack part 121b of these shafts 121, a steady rest main body 122 is formed.
shaft 12 attached by set bolt 126 to
A series of pinion gears 129 and an idle gear 130 are rotatably attached to the shaft 129 via a bearing 128 and are engaged with each other, and when the one shaft 121 operates, the other shafts 121 also operate in the same direction. It has a structure that allows you to be forced to do so.

FIG. 15 also shows the other steady rest device H.
, the roller 140a is connected to the rod 140b.
Three operating cylinders 140 provided at the tips of the base 120 are incorporated into a steady rest main body 141 that is slidably attached to the slideway 120a of the base 120. These operating cylinders 140 are arranged at a predetermined pitch in the circumferential direction of the workpiece 1 and the rollers 140
0a is arranged so that it rolls on the circumferential surface of the workpiece 1 with approximately point contact or line contact, and the axis of the workpiece 1 is always maintained against the cutting force applied to the workpiece 1. It is designed to exert force on the mind. In other words, the mounting position or piston area of each working cylinder 140 is determined in consideration of the cutting force, and the working cylinder 140 is
The pressing force of 40 can be adjusted.

FIG. 16 shows a hydraulic circuit as an example of a mechanism for operating the actuating cylinder 140. In the figure, 142 is a constant displacement hydraulic pump, 143 is a sequence valve, and 144 is for adjusting the ejection speed of the rod 140b. 145 is a flow rate adjustment valve, 145 is a switching valve, 1
46 is a pressure reducing valve. When holding the workpiece 1, the sequence valve 143 is closed in the figure, and oil flows in the direction of the arrow f through the check valve 147a to keep the pressing force of each working cylinder 140 equal. When the switching valve 145 is switched, oil enters from one side of the working cylinder 140 through the check valve 147b, and the oil pressure in the other working cylinder is applied via the piston. When this oil pressure reaches a predetermined value greater than the cutting force, oil passes through the sequence valve 143 and the rod 140b is drawn in.

Next, a means for preventing troubles caused by chips after cutting will be described.

That is, in the apparatus of the present invention, a chip conveyor 150 is provided along the longitudinal direction of the base 120 in order to efficiently collect and remove chips generated by cutting. Also, base 12
The parts other than the slideway 120a of the base 120a are formed of large grid-like ribs, and the base 12
There is an opening 120b between the slideways 120a on one side of the slideway 120a and between the slideway 120a on the other side and the column 101.
The cover 151 is tilted downward in the direction of
152 are respectively provided, and the base 1
A slope 120c that slopes toward the chip conveyor 150 is formed in the center of the chip conveyor 20.
Chips from cutting do not accumulate in various parts of the base 120 and smoothly reach the chip conveyor 150. Further, the top portion 12 of the steady rest main bodies 122, 141 of the steady rest devices G, H
As shown in FIG. 17, 2a and 141a are sharply pointed so that chips can easily fall off. Note that the covers 151 and 152 are made of a plurality of sheet metals such as a bellows-type or telescopic type or heat-resistant flexible glass fiber, and cover the steady rest main bodies 12 of the steady rest devices G and H.
2,141, and d in FIG.
A rail 1 with a cover that is expandable and retractable in the direction and provided on the column 101 together with the steady rest devices G and H
70 and supports 171a, 171b that slide on slideways 120a, 120a so as to be movable. 172 is Column 1 from fine powder radioactive materials from chips or cutting.
It is a bellows type or telescopic type retractable cover that protects and covers the slideway 101a of 01, and one end is fixed to a bracket (not shown) extended from the column 101, and the other end is fixed to the table 100. Further, the boring unit E is provided with a chip discharge means using a fluid, a brush, or the like for removing chips generated by cutting the inner surface of the workpiece 1 from inside the workpiece 1. In other words, in the case of a fluid-based chip discharge means, Fig. 18b and c
A cutting tool 92 is provided at one end 91a of the boring bar 91 as shown in FIG.
A nozzle (discharge means) 173 is provided that is directed toward the entire circumference of the inner surface of the saddle 90 side, and from this nozzle 173 a flexible hose 174 and the saddle 90 are connected to the guide hole 9 in the boring bar 91.
During cutting and when the boring unit E returns to the cutting start position, fluid such as compressed cooling air or cutting oil discharges blown chips from the inside of the workpiece 1 through the holes 0c and 91c. In the case of a brush-based chip discharge means, the cut object 1 is used instead of the nozzle 173 described above.
A brush is provided that is directed toward the inner circumference, and is used to discharge chips when the boring unit E returns to the cutting start position.

Furthermore, in the apparatus of the present invention, a hood 153 is provided to cover the entire main apparatus in order to prevent fine powder radioactive substances from being scattered around by cutting. This hood 153 has doors at required positions and is connected by a duct 154 to a suction machine equipped with a filter unit.

In addition, in FIG. 1, the reference numeral 155 is a pedestal for preventing the workpiece 1 from falling.

Next, the operation of the decontamination apparatus of the present invention will be explained.

To operate the decontamination apparatus of the present invention, first, turn on the operation preparation switch (not shown) to operate the hydraulic units such as the rotary cylinder 76, the chip conveyor 150, and the conveying device A. , operates a lubrication pump that lubricates the slideway portion of the table 100, etc., the gears in the reducer, the bearings, etc. Then, in order to transport the workpiece 1 to a predetermined position, the door of the hood 153 is left open. The workpiece 1 sent by the carry-in conveyor 2 rides on the pedestals 19, 19 of the reversing device 3, and is rotated by 90 degrees by the reversing device 3. Then, when loader B transports this to the main unit and holds it in a predetermined state,
The chuck 70 of the holding/rotating device C holds one end 1a thereof, and the roller 121a of the steady rest device G holds the workpiece 1 at a predetermined position. Thereafter, the steady rest device H holds the workpiece 1 in an appropriate position at the part to be cut, thereby preventing the workpiece 1 from swinging due to cutting.

The rotating device C holds the workpiece 1 in this state.
While rotating, the cutting unit D and boring unit E are operated to cut the outer and inner surfaces of the workpiece 1 separately or simultaneously. That is, when cutting the inner surface of the object 1 to be cut, the operation mode of a numerical control device (not shown) that controls the cutting pattern based on the shape pattern of the object 1 to be cut is set to inner surface cutting. Next, attach the cutting tool 9 to the cutting tool holding device at the tip of the boring bar 91.
2, and the amount of material to be cut 1 to be removed by cutting is set by the dimension adjustment mechanism 93, the door of the hood 153 is closed, and the cutting operation start switch is turned on. Then, the spindle 71 of the holding and rotating device C
At the same time as the workpiece 1 rotates, the feed drive device F is activated via the clutch 109, and the table 100 travels to the left in FIG. 1, and the boring unit E held by it simultaneously moves in the same direction. The inner surface of the workpiece 1 is cut to a predetermined cutting length. When cutting is completed, the DC servo motor 93d is reversed to perform tool relief, and then the clutch 109 is turned off and the clutch 111 is engaged to quickly return the table 100 to the right in FIG. 1 until it reaches the cutting start position. Along with returning
The cut object 1 that has been completely cut is carried to the reversing device 3 by the loader B, rotated by 90 degrees, and then placed on the carry-out conveyor 4 by the extrusion device 25 and carried out to a predetermined position. Further, the chips that have been cut off are conveyed to a storage container or a predetermined location by a chip conveyor 150. Note that if the workpiece 1 is long, the loader B will once carry it to the reversing device 3 and reverse it 180 degrees, then transport it again to the main unit, and use the same procedure as above to remove the workpiece. The inner surface of object 1 is cut from the other side.

On the other hand, when cutting the outer surface of the workpiece 1, the operation mode of the numerical control device is set to outer surface cutting, and the cutting unit D is operated to perform cutting. In other words, the cutting tool 80 is attached to the tool holding device of the tool rest 81.
At the same time, the amount to be cut is set by the dimension adjustment mechanism 82, the door of the hood 153 is closed, and the cutting operation start switch is turned on. Then, the spindle 71 of the holding and rotating device C rotates and the workpiece 1 rotates, and at the same time, the feed drive device F is operated via the clutch 109, and the table 100 moves to the left in FIG. The cutting unit D moves in the same direction together with the table 100, and cutting progresses to a predetermined length. When the cutting is finished, the DC servo motor 82d is reversed to perform tool relief, and then the clutch 109 is disengaged and the clutch 111 is engaged to move the table 100 back. The method for disposing of the cut object 1 and chips after cutting, and the operating procedure when the cut object 1 is long, are the same as those for inner surface cutting.

By the way, in the apparatus of the present invention, the inner and outer surfaces of the workpiece 1 can be cut simultaneously by operating the boring unit E for cutting the inner surface and the cutting unit D for cutting the outer surface at the same time. Further, as shown in FIG. 19, the flange 15
It is also possible to cut the end face of 6. in this case,
After setting cutting unit D, feed drive device F
Spindle 7 of holding and rotating device C without operating
1 and operates the DC servo motor 82d of the dimension adjustment mechanism 82 to move the cutting tool 80 up and down to perform cutting.

In the above embodiment, the feed drive device F is connected to the holding rotation device C, and the variable speed motor 73 of the holding rotation device C moves the table 100 of the feed drive device F forward, and the reverse feed motor This was sent backwards by 112, but
As shown in FIG. 20, a DC servo motor 160
is attached to one end 104a of the feed screw shaft 104,
The DC servo motor 160 may be used for reciprocating movement.

As explained above, the radioactive solid waste decontamination apparatus of the present invention is equipped with an outer surface removing means and an inner surface removing means, and is capable of removing only the outer surface, only the inner surface, or both the inner and outer surfaces of the radioactive solid waste. Since the surface can be removed freely at the same time, it is possible to decontaminate a wide range of types and sizes of radioactive solid waste, and as mentioned above, both the internal and external surfaces of the radioactive solid waste can be removed at the same time. Decontamination work can be done efficiently.

In addition, since it is equipped with a discharge means for discharging the removed material removed by the inner surface removal means from inside the radioactive solid waste to the outside, there is no possibility that the removed material will cause problems such as clogging in the radioactive solid waste. do not have. Furthermore, since the steady rest means are provided, the radioactive solid waste does not rotate eccentrically, and therefore only the radioactively contaminated layer of the radioactive solid waste can be precisely and accurately removed. Can be removed. Therefore, the amount of removed contaminated portion of radioactive solid waste can be kept to a minimum, and the extraction yield of non-contaminated portions can be increased.

[Brief explanation of drawings]

Figures 1 to 19 show an embodiment of the decontamination device of the present invention, with Figure 1 being an overall front view and Figure 2 being an overall front view.
3 is a sectional view taken in the direction - arrow of FIG. 1, FIG. 4 is a front view of the reversing device, and FIG. 6 is a diagram showing the extrusion device, FIG. 7 is a schematic diagram showing the mounting state of the loader, and FIG. 8 is a schematic diagram showing the structure of the loader.
Fig. 9 is a sectional view of the same, Fig. 10 is a diagram showing the structure of the holding rotation device and the feed drive device, Fig. 11 is a schematic diagram of the dimensional adjustment mechanism of the cutting unit, and Fig. 12 is a diagram of the dimensional adjustment mechanism of the boring unit. Schematic diagram, FIG. 13 is a cross-sectional view of the steady rest device G, FIG. 14 is a cross-sectional view taken along the - arrow in FIG. 13, FIG. 15 is a cross-sectional view of the steady rest device H, and FIG. 16 is a hydraulic circuit diagram thereof. 17th
The figure is a view in the direction of the − arrow in FIGS. 13 and 15, FIG. 18a is a diagram showing the state in which the outer surface of the workpiece is being cut, and FIGS. 18b and c are views showing the inner surface of the workpiece. FIG. 19 is a diagram showing a state in which the end face of the flange is being cut. Moreover, FIG. 20 is a schematic diagram showing another embodiment of the feed drive device. A... Conveying device, B... Loader, C... Holding and rotating device, D... Cutting unit, E... Boring unit, F... Feeding drive device, 1... Radioactive solid waste (material to be cut), 2... Loading conveyor, 3
. . . Reversing device, 4 . …Part-Time Job,
81...Turret post, 82...Dimension adjustment mechanism, 90...
... Saddle, 91 ... Boring bar, 92 ... Bit, 93 ... Dimension adjustment mechanism, 100 ... Table, 104 ... Feed screw shaft, 112 ... Reverse feed motor, G, H ... Steady rest device, 120 ... Base, 140 ... Operating cylinder, 150 ... Chip conveyor, 151, 152 ... Cover, 153 ...
...Hood, 120c...Slope.

Claims (1)

[Claims] 1. A decontamination device that holds and rotates radioactive solid waste 1 to remove the surface of the radioactive solid waste 1, wherein one end of the radioactive solid waste 1 is held and rotated. an outer surface removing means D for removing the outer surface of the radioactive solid waste 1; an inner surface removing means E for removing the inner surface of the radioactive solid waste 1; and an inner surface removing means for removing the inner surface of the radioactive solid waste 1. ejecting means 173 which is provided integrally with the radioactive solid waste 1 and discharges the removed material removed by the inner surface removing means E from inside the radioactive solid waste 1;
a feeding drive means F for moving the outer surface removing means D and the inner surface removing means E along the radioactive solid waste 1; steady rest means G that moves toward the rotation center axis of the waste 1 and supports the radioactive solid waste 1 so that the rotation center axis of the radioactive solid waste 1 coincides with the rotation center of the holding and rotation means C; A radioactive solid waste decontamination device characterized by: