JPH0476588B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a direction changing device for changing the conveying direction of a sample collection tape to which contaminants collected from the surface of an object to be inspected, such as a drum can, are attached. Regarding.

"Prior Art" Generally, radioactive waste generated at nuclear power plants and the like is packed into drums as a solidified substance and stored in a storage and processing facility. When performing this storage treatment, it is necessary to measure the surface contamination density while managing the transportation and storage of radioactive waste.

By the way, conventionally, the above-mentioned surface contamination density was measured by
The workpiece presses a smear filter paper against the surface of the object to be inspected, wipes off the radioactive material adhering to the surface of the object, and measures the amount of radioactive material adhering to the smear filter paper with a measuring instrument to determine surface contamination. Density was being measured.

``Problems to be solved by the invention'' However, in the measurement work described above, the worker must get close to the object to be inspected (drum), so the radiation level of each object to be inspected is Even if the exposure level is low, if you work for a long time, the amount of radiation exposure may become non-negligible. For this reason, it is desired to automate and remotely measure the surface contamination density, and various measuring devices have been proposed (for example, Japanese Patent Application Laid-open No. 143797/1983). In addition to being unsatisfactory in terms of reliability and work efficiency when attempting to perform measurements across multiple locations, it is also difficult to identify the contaminated location or There is a problem that it is difficult to remove pollutants.

As a result of various studies, the inventors of the present invention have developed a new surface contamination density measuring device. and,
In the present invention, when changing the conveying direction of the sample collection tape used in this surface contamination density measuring device,
It is an object of the present invention to provide a device for changing the direction of a sample collection tape, which can smoothly and reliably change the direction of the sample collection tape without causing damage to the sample collection tape.

"Means for Solving the Problems" In order to achieve the above object, the present invention forms a sprocket at the end that engages with the locking hole of the sample collection tape, and guides and conveys the sample collection tape. The main conveyance roller is provided with a main conveyance roller, a subconveyance roller arranged at a predetermined angle with respect to the main conveyance roller, and a drive mechanism that separately drives both conveyance rollers.

"Function" In the sample collecting tape direction changing device of the present invention, the sprocket of the main transport roller engages with the locking hole of the sample collecting tape to guide and transport the sample collecting tape, and at the same time guides and transports the sample collecting tape. The rollers are driven to transport the sample collection tape sent from the main transport roller by changing the transport direction.

"Embodiment" Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 14.

FIG. 1 is a front view of the top plate sample collection device, and the direction changing device X of the present invention is installed at the tip of the top plate sample collection device to change the direction of the sample collection tape. The above-mentioned top plate sampling device forms a part of the surface contamination density measuring device shown in Fig. 2.The outline of this surface contamination density measuring device will be explained first.
A turntable (rotation mechanism) 1 on which a drum (inspected object) D is placed and rotates the drum D
and the top plate sampling device 2, side plate sampling device 3, and bottom plate sampling device 4 for collecting contaminants (radioactive substances) attached to the top plate Da, side plate Db, and bottom plate of the drum D. The basic structure consists of a measurement chamber 5 for measuring samples collected by each of the sample collection devices 2, 3, and 4, and a disposal box 6 for collecting the samples measured by the measurement chamber 5.

The above-mentioned top plate sampling device 2 includes a pair of support columns 7c and one square threaded rod 7 between an upper bearing stand 7a and a base 7b which are arranged vertically opposite to each other and spaced apart from each other.
d, a top plate arm 20 supported vertically and movably by both columns 7c and a square threaded rod 7d of a support stand 7 formed by erecting a reinforcing column 7e, and these top plate arms 20; A lifting mechanism 21 for raising and lowering, a top plate arm head 22 provided on the top plate arm 20 so as to be movable in the horizontal direction, a forward and backward movement mechanism 23 for moving the top plate arm head 22, and a top plate arm head 22 and the top plate arm. 20 and a belt feeding mechanism 24 that is installed between the inlet of the measurement chamber 5 and conveys the sample to the measurement chamber 5. In addition, the side plate sample collection device 3 is
A pair of upper and lower side plate arm heads 32, 32 is provided at the tip of the side plate arm 30 so as to be movable in the horizontal direction, and a pair of upper and lower forward and backward movement mechanisms (not shown) for moving each side plate arm head 32, 32 and a measurement chamber for the sample are provided. The bottom plate sampling device 4 includes a pair of upper and lower belt feeding mechanisms 34, 34 for conveying the sample to the bottom plate 5, and one lifting mechanism (not shown) for moving the side plate arm 30 up and down.
0, an elevating mechanism 41, a bottom plate arm head 42, a forward/backward movement mechanism 43, and a belt feeding mechanism 44, but the configuration of each of these parts is almost the same as that of the above-mentioned top plate sample collecting device 2, so a description thereof will be omitted.

Base plate 20a of the top plate arm 20
as shown in FIG. 3, to both supports 7c via the slide bearing 20b, and as shown in FIG.
They are each supported via bearings 20c by vertical drive nuts 21a that are engaged with square threaded rods 7d. The lifting mechanism 21 includes the vertical driving nut 21a and the vertical driving nut 21a.
A gear 21b externally mounted on the gear 21b, a gear 21d of the reducer 21c meshed with the gear 21b, and the reducer 2
1c and a vertical drive motor 21f connected via a coupling ring 21e. A slide plate 22b of the top plate arm head 22 is supported by a pair of upper and lower guide rails 20d arranged parallel to the base plate 20a via a sliding member 22a so as to be movable in the horizontal direction. The forward and backward movement mechanism 23 operates between the bearing member 20 and the guide rails 20d.
A ball screw shaft 23a is attached to the base plate 20a via e and 20f, and a slide plate 22 is attached to the ball screw shaft 23a.
a ball screw nut 23b fixed to b, and a gear 23c attached to the base end of the ball screw shaft 23a.
and a gear 23e of a forward/reverse drive motor 23d meshed with this gear 23c.

A tape cutting mechanism 25, a sub-tape transport mechanism 26, and a tape pressing mechanism 27 are attached to the slide plate 22b of the top plate arm head 22 in this order from the base end to the distal end. As shown in FIG. 13, this tape cutting mechanism 25 cuts the contamination test tape (sample collection tape) T being conveyed along tape guides 25d and 25e using a cutter cylinder fixed to a slide plate 22b. By operating the blade 25a, the cutting blade 25a is inserted between the movable blade 25a and the fixed blade 25c arranged above and below to cut.

Further, as shown in FIG. 8, the sub tape transport mechanism 26 includes a sub roller drive device 26a installed on the slide plate 22b, and a sub roller drive device 26a installed on the slide plate 22b of the sub roller drive device 26a.
Gear 26b attached to the tip of the rotating shaft passing through
A drive shaft 2 has a gear 26c meshing with the gear 26b attached to one end thereof and is rotatably supported by the slide plate 22b via a bearing member 22c.
6d, an auxiliary conveyance roller 26f attached to the other end of the drive shaft 26d and having sprockets 26e formed at both ends, and a concave cross-section shaped roller 26f at both ends that engages with both gears 26e. A presser roller 26h formed with a locking portion 26g is rotatably sandwiched between the presser roller 26h at a bifurcated distal end, and its base end is rotatably attached to a lever fulcrum shaft 26i fixed to a slide plate 22b. A tension coil spring 2 is stretched between the supported lever 26j and a spring hanging shaft 26k fixed to the middle part of the lever 26j and the slide plate 22b.
6l, and the auxiliary roller drive device 26a
This rotates the sub-transport roller 26f, and the tension coil spring 26l rotates the presser roller 26h about the lever fulcrum shaft 26i to press it against the sub-transport roller 26f. The direction changing device X is constituted by this sub-tape transport mechanism 26 and a main tape transport mechanism 94 of the roller pressing support section 8, which will be described later.

Further, as shown in FIG. 7, the tape pressing mechanism 27 includes a pressing cylinder 27b provided at the top of the tip of the slide plate 22b via a bracket 27a, and a pressing cylinder 27b provided at the tip (lower end) of the piston rod of the pressing cylinder 27b. link ball 2
A movable shaft 27d bendably connected via 7c.
The movable shaft 27d is slidably supported in the vertical direction via a slide bearing 27e, and a hollow gear shaft 27g is rotatably attached to the slide plate 22b via a bearing member 27f. Gear 27h attached to the top of shaft 27g
and a gear 27i meshed with this gear 27h,
This gear 27i is attached to a rotating shaft, and the oscillating drive device 27j installed on the slide plate 22b is attached to the surface of the slide plate 22b opposite to the surface on which the oscillating drive device 27j is installed. A supply reel 27l for contamination inspection tape T provided via a member 27k and the movable shaft 2
The pressure roller support section 8 is attached to the tip (lower end) of the roller 7d.

As shown in FIG. 14, the contamination inspection tape T wound around the supply reel 27l is placed in the center of a transporting core material Ta made of a long polyethylene or the like with a width narrower than that of the transporting core material Ta. A sample collection sheet material Tb made of smear filter paper, non-woven fabric, etc. is pasted, and locks are attached to both side edges of the transporting core material Ta to engage with sprockets for guiding and transporting the transporting core material Ta. Holes Tc are formed at appropriate intervals.

Further, the pressing roller support section 8 includes a pair of parallel, substantially triangular roller frames 81 and 82 attached to the tip of the movable shaft 27d via a joint 80, and both roller frames 81 and 82.
In FIG. 7 of 82, the tape guide 83 provided between the upper left corner and both roller frames 81, 8
A press roller 84 is rotatably mounted between the lower corners of the roller frames 81 and 82 and has a surface covered with a soft resin such as urethane. Rollers 85 and 86 are attached to the rollers and have sprockets 85a and 86a at both ends.
At a position above these rollers 85, 86, a pair of levers 87 are rotatably attached to both roller frames 81, 82, respectively.
and presser rollers 88 and 89 which are rotatably attached to the tips of each pair of levers 87 and have locking portions 88a and 89a formed at both ends to engage with the teeth portions 85a and 86a, and each presser roller 88. ,89
and each presser roller 88, 89
a tension coil spring 90 for pressing the rollers 85 and 86, respectively, and a roller frame 8.
A tape reel 93 is installed at the middle part of the roller frame 81 and 82 via a mounting plate 91 and supplies an adhesive tape 92 between the roller 86 and the presser roller 89, and a tape reel 93 is installed between the roller frames 81 and 82 and is used for the contamination inspection. The main tape transport mechanism 94 of the direction changing device X described above is configured to transport the tape T. Note that both locking portions 88a of the presser roller 88 are formed with a concave cross section, and both locking portions 89a of the presser roller 89 have rectangular grooves formed in the cylindrical surface (FIG. 9). and the 10th
(see figure).

The main tape transport mechanism 94 includes a main roller drive device 94a installed between both roller frames 81 and 82, a motor pulley 94b attached to a rotating shaft of the main roller drive device 94a passing through the roller frame 82, and a roller frame 82
A tension pulley 94c is vertically adjustable and rotatably attached to the drive shaft 94d, and a drive shaft 94d is rotatably supported by both roller frames 81 and 82.
and a drive shaft 94 passing through the roller frame 82.
The driven pulley 94e attached to one end of
A drive roller 94h is attached to the drive shaft 94d and is attached to the roller frame 81, and a gear 94h is attached to the other end of the drive shaft 94d passing through the roller frame 81. A gear 94j, a snap shaft 94k having the gear 94j attached to one end and rotatably supported by both roller frames 81 and 82, and a snap shaft 94k mounted on the snap shaft 94k between both roller frames 81 and 82, and A conveyance roller 94m provided with sprockets 94l at both ends, a pair of levers 94m rotatably attached to both roller frames 81 and 82 above the conveyance roller 94m, and these levers. A presser roller 94q is rotatably supported at the tip of the roller 94m and has locking portions 94p formed at both ends to engage with the tooth portions 9l, and a presser roller 94q.
Both ends of the support shaft 94r and both roller frames 8
1 and 82, and a tension coil spring 94s for pressing the presser roller 94q against the conveyance roller 94m. Then, the contamination test tape T with the adhesive tape 92 attached to the sample collection sheet material Tb
is the drive roller 94h and the conveyance roller 94.
After passing between the transport roller 94m and the presser roller 94q, the tape is converted into a 90° angle and supplied to the sub-tape transport mechanism 26.

In the belt feeding mechanism 24, a pair of parallel support plates 24b supporting four rotatable rollers 24a each on the upper and lower sides are fixed to the slide plate 22b via frame supports 24c.
In addition, a pair of upper and lower rotatable rollers 24a are installed at appropriate positions on the base plate 20a to support the frame support 24.
A pair of parallel support frames 24e, which support four rotatable rollers 24a and four upper and lower tension adjustment mechanisms 28, are attached to the base end of the base plate 20a via frame struts 24d. At the same time, a drive motor 24f is installed at the entrance of the measurement chamber 5.
A pair of upper and lower drive pulleys 24 driven by
g and one rotatable roller 24a are installed. These rollers 24a and drive pulleys 24g each have ring-shaped protrusions formed at both ends, and each roller 24
A pair of upper and lower timing belts 24i are wound around the center portions of the drive pulley 24g and the drive pulley 24g. The contamination inspection tape T is held between both timing belts 24i and is mainly conveyed by the lower timing belt 24i. Further, the tension adjustment mechanism 28 has a rotatable roller 28a that moves in the longitudinal direction of a long hole 24j formed in the support frame 24e, thereby adjusting the spring force of the compression coil spring 28b and the timing belt 24i. The tension is balanced.

The measurement chamber 5 is used to measure the density of contaminants attached to the contamination test tape T, and at its exit part there is a pair of upper and lower rollers driven by a drive motor 5a, and a contamination test tape. A shooter 5b for putting the T into the waste box 6 is installed respectively.

Next, a case will be described in which a sample is collected from the top plate Da of the drum can D using the surface contamination density measuring device equipped with the direction changing device for the sample collection tape T configured as described above.

In this case, when the sampling of one drum D is completed, the tip of the contamination test tape T is
Contamination inspection tape T located just before the tape cutting mechanism 25 and extending from its tip to the pressure roller 84
is a free running range where no samples are taken (e.g. 200
mm). In this state, a new drum can D is placed on the turntable 1 and rotated, and the lifting mechanism 21 and forward/backward movement mechanism 23 are operated to move the pressure roller support part 8 at the tip of the top plate arm head 22 to the drum can. D, and presses the pressure roller 84 at the tip of the pressure roller support part 8 against the top plate Da with a predetermined pressure by the pressure cylinder 27b of the tape pressing mechanism 27, while
Main tape transport mechanism 94 and sub tape transport mechanism 26
and operates the belt feeding mechanism 24. As a result, the main tape transport mechanism 94 causes the contamination inspection tape T wound around the supply reel 27l to pass between the roller 85 and the presser roller 88.
It is sent to a pressure roller 84. In this case, the pressing roller 84 is pressed so that its axis almost coincides with the radial direction of the top plate Da of the rotating drum D, and the rotational speed of the drum D and the feed rate of the contamination inspection tape T are For example, the relationship between the sampling area of the drum D and the contamination test tape T
The area is set to be 20:1. Therefore, the contamination inspection tape T passing through the pressing roller 84 is transferred while being pressed against the rotating top plate Da, and as a result, the contamination inspection tape T
The contact surface of the drum can D with the top plate Da changes sequentially, and the contamination inspection tape T in contact with the rotating top plate Da constantly changes to a new surface. Also,
When pressing the pressure roller 84 against the top plate Da,
As the pressure roller 84 moves toward the center of the top plate Da,
The main tape transport mechanism 94 is operated to slow down the tape transport speed. In addition, when the rotational speed of the drum D is high, the oscillating drive device 27j is operated to tilt the axis of the pressure roller 84 at a predetermined angle from the radial direction of the top plate Da of the drum D. The sampling width may be narrowed.

Next, the contamination inspection tape T that has passed through the pressure roller 84 is passed through the roller 86 and the pressure roller 8.
9 and wrapped around the tape reel 93.
After pasting on Tb and protecting the Tb surface of the sheet material,
The tape is sent to the main tape transport mechanism 94. Then, the contamination inspection tape T that has been wound around and conveyed around the drive roller 94h of the drive roller 94 of the main tape conveyance mechanism 94 is further sandwiched between a conveyance roller 94m and a presser roller 94q, and is then conveyed by the conveyance roller 94m. The conveyance direction is
While maintaining the horizontal state by twisting the tape by 90 degrees, it is sandwiched between the sub-conveyance roller 26f and presser roller 26h of the sub-tape conveyance mechanism 26, and is transferred to the tape cutting mechanism 25 by the sub-conveyance roller 26f. Ru. In this case, both the tape transport mechanisms 94,
By adjusting the operation timing of 26 to appropriately slacken the contamination inspection tape T between the main tape conveyance mechanism 94 and the sub tape conveyance mechanism 26, the contamination inspection tape T can be prevented from being damaged. It is transported smoothly without any problems.

Next, the pressing roller 84 is appropriately moved in the radial direction of the top plate Da of the drum can D by the forward and backward movement mechanism 23, and when the sample collection operation is completed over the entire surface of the top plate Da, the lifting mechanism 21 is moved. Therefore, after the tape is released from the top plate Da to the pressure roller 84, the tape is transported by the above-mentioned tape transport mechanisms 94 and 26.
Fast forward the contamination inspection tape T. Then, sample collection range of contamination test tape T (e.g. 600mm)
When the terminal end of passes through the tape cutting mechanism 25,
The tape T for contamination inspection is cut by the tape cutting mechanism 25. As a result, the length of the cut contamination inspection tape T is the sum of the free running range and the sample collection range (for example, 800 mm).

Next, the cut contamination inspection tape T
is the drive motor 24 of the belt feeding mechanism 24.
It is guided into the measurement chamber 5 through a pair of upper and lower endless timing belts 24i that run by a distance f. Then, the free running range of the contamination inspection tape T passes through the measurement chamber 5 as it is,
Then, the sampling area is measured in the measurement chamber 5.
A drive motor 24 installed at the inlet and outlet of the
f, 5a intermittently, and the contamination density is measured at predetermined intervals (for example, every 20 mm).
When all the sample collection ranges have been measured, the contamination test tape T is stored in the waste box 6.

As described above, the sample collection from the drum D and the measurement of the contamination density are carried out smoothly.
In this case, since the contamination test tape T after sample collection is cut by the tape cutting mechanism 25 and then sent to the measurement chamber 5, even though the contamination density is measured intermittently in the measurement chamber 5, the drum can Samples can be collected continuously from the top plate Da, side plate Db, and bottom plate Dc, resulting in extremely high work efficiency. Also, the conveyance direction of the contamination test tape T at the time of sample collection in the press roller 84 section and the tape cutting mechanism 2
The main tape transport mechanism 94 having a drive roller 94h and a transport roller 94m parallel to the axis of the pressure roller 84 is located downstream of the pressure roller 84, and Sub-tape transport mechanisms 26 having sub-transport rollers 26f that correspond to the transport direction of the tape T for contamination inspection during cutting are arranged upstream of the tape cutting mechanism 25, and both tape transport mechanisms 9
By adjusting the operation timings of the main tape transport mechanism 94 and the sub tape transport mechanism 2,
6, the contamination inspection tape T can be conveyed with appropriate slack. Therefore, when the contamination inspection tape T is twisted at a predetermined angle and conveyed, the contamination inspection tape T can smoothly change its conveying direction, and problems such as damage do not occur.

In this embodiment, the sub-conveyance roller 26f of the sub-tape conveyance mechanism 26 is provided with sprockets 26e at both ends. However, when the contamination inspection tape T does not meander, the sub-conveyance roller 26f The sprocket 26e of the roller 26f does not need to be formed. In addition, in this example, the measurement of surface contamination or decontamination of drums was explained, but the invention is not limited to this.
It can also be applied to measuring or decontaminating the surface of containers or objects other than drums, and can also be applied to toxic substances other than radioactive substances, toxic microorganisms, etc. as contaminants.

"Effects of the Invention" As explained above, according to the present invention, a sprocket is formed at the end portion to engage with the locking hole of the sample collection tape, and a main conveyance roller that guides and conveys the sample collection tape. , a sub-conveyance roller arranged at a predetermined angle with respect to the main conveyance roller, and a drive mechanism that drives both conveyance rollers separately, so that the sprocket of the main conveyance roller can be used for sample collection. The sample collection tape is guided and conveyed by engaging with the locking hole of the tape, and the sub conveyance roller is driven to change the conveyance direction of the sample collection tape sent from the main conveyance roller. The excellent effect is that the direction can be changed smoothly and reliably, and problems such as damage to the sample collection tape will not occur.

[Brief explanation of drawings]

Figures 1 to 14 show an embodiment of the present invention; Figure 1 is a front view of the top plate sample collection device;
Figure 2 is a perspective view showing the overall configuration of the surface contamination density measuring device, Figure 3 is a plan view of the top plate sample collection device, Figure 4 is a front view of the top plate arm, and Figure 5 is the same as in Figure 4. -A cross-sectional view along the line, Figure 6 is of Figure 4-
7 is a side view of the tape pressing mechanism, FIG. 8 is a sectional view of the sub-tape transport mechanism, FIG. 9 is a view taken along the - line in FIG. 7, and FIG. 10 is a view of the presser roller 89. 11 is a sectional view of - of FIG. 7.
12 is a cross-sectional view of the pressure roller support portion; FIG. 13 is a cross-sectional view of the tape cutting mechanism;
FIG. 4 is a perspective view of the contamination inspection tape. T...Tape for contamination inspection (tape for sample collection),
Tc...Lock hole, X...Direction changing device, 26...
Sub tape transport mechanism, 26a...Sub roller drive device, 26f...Sub transport roller, 27...Tape pressing mechanism, 94...Main tape transport mechanism, 94a...
...Main roller drive device, 94g...Teeth (sprocket), 94h...Drive roller, 94l...
Teeth (sprocket), 94m...conveyance roller.

Claims (1)

[Claims] 1. A direction changing device for changing the conveying direction of a sample collection tape having locking holes formed in the side edge,
A main transport roller having a sprocket formed at the end thereof to engage with a locking hole of the sample collection tape and guiding and transporting the sample collection tape, and a main transport roller tilted at a predetermined angle with respect to the main transport roller. Sample collection characterized by comprising: a sub conveyance roller around which a sample collection tape arranged and guided and conveyed by the main conveyance roller is wound; and a drive mechanism that separately drives both the conveyance rollers. device for changing the direction of tape.