JP3938018B2 - Land Remonitor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a landry monitor that inspects for the presence or absence of radioactive contamination of clothing or the like worn by a worker engaged in a radioactive material handling facility such as a nuclear power plant and sorts the test object according to the inspection result.
[0002]
[Prior art]
FIG. 4 is a perspective view showing an appearance of an example of a conventional landry monitor, and FIG. 5 is a side sectional view showing an internal configuration thereof.
As described above, the Landry monitor is a device that inspects and sorts the presence of radioactive contamination such as clothing worn by workers engaged in radioactive material handling facilities. Folding table 1 for feeding into the inside, transport unit 2 for transporting the test object, operation panel 3 equipped with switches and indicators for operating the apparatus, and radiation from the test object A radiation detection unit 4 for detecting the above, a control unit 5, an “insertable” indicator lamp 61, a sound generation unit 62, a printer 63, a maintenance door 7, an operation mode changeover switch with an indicator lamp (not shown), etc. I have.
[0003]
The transport unit 2 includes a drive motor (not shown), a drive transmission belt that transmits power of the motor, a lower drive roller 23 and an upper drive roller 24 that are driven by the drive transmission belt, and these rollers 23 and 24, respectively. A stainless steel lower metal mesh 26 and an upper metal mesh 27 that are driven, a plurality of tension rollers 25 that position the metal meshes 26 and 27 and apply appropriate tension to the metal meshes 26 and 27, and an unillustrated The tension adjusting mechanism is composed of an entrance-side photoelectric sensor 28 and an exit-side photoelectric sensor 29 that detect the position of the object to be conveyed.
The lower drive roller 23 and the upper drive roller 24, the plurality of tension rollers 25, and the lower metal mesh 26 and the upper metal mesh 27, which are test object holding and conveying members, constitute lower and upper conveyors, respectively. Both photoelectric sensors 28 and 29 comprise a projector and a light receiver, respectively.
[0004]
The operation panel 3 has a measurement start switch for starting the measurement, a measurement end switch for ending the measurement, an LCD operation display for displaying various information such as a device failure or abnormality, and an alarm for resetting the alarm after the failure or abnormality is recovered. A reset switch, a counter reset switch for resetting a counter for counting the number of measured objects, and the like are provided.
The radiation detection unit 4 includes a plastic scintillator detector 41, a lead shield 42 surrounding the plastic scintillator detector 41, and a signal processing circuit (not shown).
The “insertable” indicator lamp 61 is lit when there is no abnormality such as retention of the test object in the apparatus, and when the operator places the test object on the folding table 1 and inserts it into the lower wire mesh conveyor 26. The sound generator 62 generates a sound “ping-pong”. The inserted test object is conveyed by the operation of the “measurement start” button on the operation panel 3, the presence or absence of radioactive contamination is inspected by the radiation detection unit 4, and sorted according to the inspection result. Inspection results, setting values, and the like are printed by the printer 63.
In addition, the operation mode changeover switch is used to switch the operation mode to an automatic mode for normal measurement, a calibration mode applied at the time of calibration of a radiation detector using a radiation source, or a manual mode applied at the time of maintenance.
[0005]
As this type of Landry monitor, one having a configuration described in Japanese Patent Application Laid-Open No. 6-123776 is known.
[0006]
[Patent Document 1]
JP-A-61-223776 [0007]
[Problems to be solved by the invention]
The lower wire mesh 26 and the upper wire mesh 27 for transporting the Landry monitor as described above need to keep the aperture ratio high in order not to reduce the amount of radiation emitted from the test object. Is made of braided stainless steel wire. If the wire diameter is made too thin in order to increase the opening ratio, there is a concern that the stainless steel wire is likely to be cut and the wire meshes 26 and 27 are likely to be stretched. Optimized. However, since the lengths of the metal meshes 26 and 27 increase as the operating time elapses, a mechanism for adjusting the respective tensions of the metal meshes 26 and 27 by adjusting the positions of the tension rollers 25 corresponding to the lengths is necessary. Furthermore, if this adjustment is repeated several times, the pitches of the metal meshes 26 and 27 become longer, and the tooth pitches of the gears for the metal mesh attached to the drive rollers 23 and 24 and the metal mesh pitch do not match each other. Either or both of the wire meshes 26 and 27 will have to be replaced.
[0008]
Moreover, the replacement work of the wire meshes 26 and 27 is a work that requires skill, and in particular, the work of connecting the both ends of the wire mesh adds a caulking work to prevent the wire mesh from being detached. If the experienced person does not work, it takes an enormous amount of time for replacement, which hinders operation of the device. In addition, when an inexperienced person completes the replacement work in a short time, troubles such as disconnection of the connection part within a few days after resuming operation often occur.
The object of the present invention is to solve the above-mentioned problems, reduce the cost of the transport section, and easily replace the object holding and transporting member such as a wire mesh, and does not require an expert for maintenance. Is to provide.
[0009]
[Means for Solving the Problems]
The invention of claim 1 has a basic configuration of a test object such as a decontaminated garment in which clothes worn by a worker engaged in a radioactive material handling facility such as a nuclear power plant are washed to remove dirt. In order to inspect the presence or absence of radioactive contamination and sort the test object according to the inspection result, a landry monitor provided with a transport means of the test object, a radioactive contamination inspection means, a sorting means, etc., as the transport means A belt group as an object holding and conveying member composed of a plurality of conveyor belts in an endless rubber band structure made of rubber as a main material, and a driving roller driven by a driving motor to drive the belt group; And a tension roller that determines the position of the belt group together with the driving roller and maintains the tension application state.
[0010]
The present invention includes a belt group consisting of a plurality of conveyor belts in an endless rubber band structure with rubber as a main material as a specimen holding and conveying member, and tension is always applied to the belt group due to the elasticity of the rubber. It is not necessary to adjust the tension by adjusting the position of the tension roller according to the elongation of the wire mesh as in the conventional example using the wire mesh, and it is not necessary to provide the drive roller with a gear. . Further, the belt group does not need to be arranged vertically and horizontally like a wire mesh, and it is only necessary to dispose the conveying belt only in the longitudinal direction, so that it is possible to secure an opening ratio equal to or higher than that of the wire mesh. Furthermore, the belt group has a simple structure and is much cheaper than a metal mesh, and the replacement work of the conveyor belt is easy, and does not require a high level of skill such as replacement of the metal mesh.
[0011]
And in particular, the invention of claim 1, wearing the transfer belt spare on either side or portion that is not involved in the transport of the object on either side of the front SL drive rollers.
Since wearing the conveyor belt of the spare drive rollers, Ru can respond quickly and reliably if the conveyor belt has expired.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention, as a basic configuration, Tei replacing the specimen holding and conveying member of the conveying section of La Ndorimonita, the belt group including a plurality of conveyor belts with and endless rubber band structure of rubber as a main material from a conventional wire mesh The
In the following, embodiments of the landry monitor according to the present invention will be described in more detail with reference to examples. In addition, the same code | symbol is used for the part of the same function as a prior art.
The embodiment of the landry monitor according to the present invention has the same external appearance and internal structure as the conventional example as shown in FIGS. 4 and 5, and is a folding type for placing clothes or the like as a test object into the apparatus. Table 1, transport unit 2a for transporting the test object, operation panel 3 provided with switches and indicators for operating the apparatus, radiation detection unit 4 for detecting radiation from the test object, control Part 5 and the like. Since this embodiment is different from the conventional example in the conveyance section, the conveyance section 2a of the embodiment will be described below, and the description of the other sections will be omitted.
[0013]
FIG. 1 is a conceptual perspective view showing the configuration of the transport section 2a of this embodiment, and FIG. 2 is a plan view showing details of rollers such as the lower drive roller 23 of this embodiment.
The transport unit 2a includes a drive motor 20, a first drive transmission belt 21 and a second drive transmission belt 22 that transmit this driving force, a gear 30 that transmits the driving force and reverses the driving direction, and a lower side It comprises a part drive roller 23 and an upper part drive roller 24, a plurality of tension rollers 25, a lower round belt group 26a and an upper round belt group 27a, and corresponds to the lower side drive roller 23 and this. The four tension rollers 25 and the lower round belt group 26a constitute the lower conveyor, and the upper drive roller 24, the corresponding three tension rollers 25 and the upper round belt group 27a constitute the upper conveyor. is doing.
[0014]
The driving force of the drive motor 20 is transmitted to the lower drive roller 23 by the first drive transmission belt 21 to drive the lower conveyor. The driving force of the drive motor 20 is transmitted to the upper drive roller 24 by the first drive transmission belt 21, the gear 30, and the second drive transmission belt 22, and drives the upper conveyor.
The test object fed from the folding table is conveyed by the lower round belt group 26a and the upper round belt group 27a, inspected for radioactive contamination, and sorted according to the inspection result.
The thickness of the conveying round belts 261 and 271 is, for example, Φ2 mm. The conveying round belts 261 and 271 are arranged at a predetermined pitch, for example, 12 mm, and constitute a lower round belt group 26a and an upper round belt group 27a, respectively.
In order to keep the above-mentioned pitch and prevent misalignment, the lower side driving roller 23, the upper side driving roller 24, and the tension roller 25 are formed with positioning grooves 231 as shown on the left side of FIG. The conveying round belts 261 and 271 are used by being fitted into the positioning grooves 231 as shown on the right side of FIG. When such round belt groups 26a and 27a are used as the object holding and conveying members, since an object that shields radiation exists only in the conveying direction, a large aperture ratio can be easily obtained. The aperture ratio in the case of a wire mesh is equal to or higher than that, and the radiation detection efficiency can be improved.
[0015]
Furthermore, since the cost of the round belt is as low as about one-tenth of the cost of the wire mesh, this embodiment can greatly reduce the cost. Further, since it is not necessary to provide the drive rollers 23 and 24 with gears, this also contributes to cost reduction.
Further, the conveying round belts 261 and 271 are used by being stretched so as to have an appropriate tension. This elongation rate is, for example, 5%. Since an appropriate tension can be obtained by stretching the roller when it is set on the roller, a tension adjusting mechanism as in the prior art becomes unnecessary, which also contributes to cost reduction.
In particular, in the above-described embodiment, in preparation for the case where the transporting round belts 261 and 271 are cut, the spare round belt 264 and the spare round belt 264 and the both ends of the roller that are not used for transporting the test object are used. 274 is attached, and when the transfer round belts 261 and 271 are cut, the belts 261 and 271 are moved to the cutting section, so that a quick and reliable response is possible.
[0016]
The transport belts 261 and 271 are used in an endless state like rubber bands, but do not have an endless structure from the beginning. A thing provided with hook hook can also be used. With this structure, it is easy to replace the transport round belts 261 and 271 at any position when they are cut. The reason for making the hook and the hook hook smaller than the thickness of the string portion is to prevent an object such as clothing from being caught by the hook and the hook hook and hindering the conveyance.
When the transfer round belts 261 and 271 are cut and replaced, it is only necessary to set the transfer round belts 261 and 271 in a stretched state, and a special skill requiring skill is not required. In particular, replacement with a hook and hook hook as shown in FIG. 3 becomes easier.
[0017]
In the embodiment described above, a round belt is used as the transport belt. However, the transport belt is not limited to the round belt, and a square belt or the like can naturally be used as the transport belt.
[0018]
【The invention's effect】
In the first aspect of the invention, as a basic configuration, the belt group is composed of a plurality of conveying belts that are made of rubber and made of endless rubber bands and are in a tensioned state. Tension is applied, and it is not necessary to adjust the tension by adjusting the position of the tension roller according to the elongation of the wire mesh as in the conventional example using a wire mesh, and it is not necessary to provide a gear on the driving roller is there. Further, the belt group does not need to be arranged vertically and horizontally like a wire mesh, and it is only necessary to dispose the conveying belt only in the longitudinal direction, so that it is possible to secure an opening ratio equal to or higher than that of the wire mesh. Furthermore, the belt group has a simple structure and is much cheaper than a metal mesh, and the replacement work of the conveyor belt is easy, and does not require a high level of skill such as replacement of the metal mesh.
Therefore, according to this invention, the land monitor which the cost of a conveyance part is cheap and does not require an expert for a maintenance can be provided.
[0019]
In addition, according to the first aspect of the present invention, since the spare conveying belt is mounted on the driving roller, it is possible to quickly and reliably cope with the case where the conveying belt is cut.
[Brief description of the drawings]
FIG. 1 is a conceptual perspective view showing the configuration of a transport section of an embodiment of a landry monitor according to the present invention. FIG. 2 is a plan view showing details of rollers such as a lower drive roller. FIG. 4 is a perspective view showing the appearance of an example of a conventional landry monitor. FIG. 5 is a side sectional view showing the internal configuration of the conventional example.
1 Folding table 2, 2a Transport section
20 Drive motor 21 First drive transmission belt
22 Second drive transmission belt 23 Lower drive roller
24 Upper side drive roller 25 Tension roller
26 Lower wire mesh 26a Lower round belt group
261 Conveyor belt 262 Hook hook
263 Hook 264 Spare Round Belt
27 Upper wire mesh 27a Upper round belt group
271 Conveyor belt 274 Spare belt
28 Inlet photoelectric sensor 29 Outlet photoelectric sensor
30 Gear 3 Operation panel 4 Radiation detector
41 Plastic scintillator detector 42 Lead shield 5 Control unit
61 `` Insert ready '' indicator light 62 Sound generator
63 Printer 7 Maintenance door

Claims (1)

In order to inspect for the presence of radioactive contamination of the specimens such as clothing worn by workers engaged in radioactive material handling facilities such as nuclear power plants, and to sort the specimens according to the inspection results, Landry monitor equipped with a transport means, radioactive contamination inspection means, sorting means, etc.
As the conveying means, a belt group as an object holding and conveying member composed of a plurality of conveying belts having an endless rubber band structure made of rubber as a main material and in a tensioned state, and driven by a drive motor to drive the belt group. a driving roller, a tension roller for maintaining the tension applied state together with the drive roller to position the belt group, Bei Ete become a
A spare conveyance belt is attached to a part not involved in conveyance of the test object on both sides or either side of the driving roller,
Landry monitor characterized by that.

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