JP2940205B2 - Goods unloading monitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of radioactive substances in articles which are installed at the entrance of a radiation control area in a facility for handling radioactive substances such as a nuclear power plant and are carried out from the inside of the control area to the outside of the control area. The present invention relates to an article unloading monitor as a device used for monitoring contamination (hereinafter, this contamination may be referred to as radioactive contamination), and particularly to a monitor capable of quickly unloading articles.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional side view for explaining the structure of a conventional article unloading monitor 1, and FIG. 4 is a perspective view of a main part in FIG. 3 and 4, reference numeral 2 denotes a wall that partitions the inside 3 of the radiation control area from outside 4, and reference numeral 5 denotes a monitor 1 that penetrates the wall 2 so that the radiation monitor unit 6 projects into the inside 3.
A floor surface of a table surface 5a on which a dish-shaped article storage tray 8 that stores articles 7 such as tools that need to be carried out of the area 3 to the outside 4 is provided. A table formed so that the height H0 from 9 is approximately 70 cm, and 10 is a tray 8 placed on the table 5.
The first radiation input window 10a has a shape and dimensions capable of detecting radiation emitted downward from the tray 8 carried into the inspection room 11 in the radiation monitor unit 6 at a time by being manually pushed in. Provided and this window 1
Reference numeral 0a denotes a first radiation detector fixedly disposed so as to be close to and opposed to the tray 8 carried into the examination room 11, and
2 is provided with a planar second radiation incident window 12a having a shape and dimensions capable of detecting radiation radiated upward from the tray 8 carried into the inspection room 11 at one time.
A second radiation detector 2a is disposed above the tray 8 so as to face the tray 8 in a substantially horizontal state.

[0003] The reference numeral 13 denotes a wire 14 for suspending the detector 12, a driven pulley 15 and a drive pulley 16 around which the wire 14 is wound, a motor 17 and a belt for driving the pulley 16. 18;
A contact detector 20 charged in the detector 12,
The detector 12 is raised and lowered by the motor 17 and the detector 1
The detector 20 detects that the detector 2 has come into contact with the tray 8 or the article 7 accommodated in the tray 8 during the descent, thereby stopping the motor 17 and stopping the descent operation of the detector 12. Lifting device, 21 is the detector 10
Is used to determine the presence or absence of radioactive contamination in the article 7 using the first radiation detection signal 10b output by the detector 12 and the second radiation detection signal 12b output by the detector 12, and outputs a determination signal 21a representing the result of this determination. Pollution determination device, 22 is signal 2
If the signal 1a is inputted and the signal 21a is a signal indicating no contamination, the tray 8 in the inspection room 11 is carried out from the tray outlet 23 provided in the monitor 6 to the outside of the monitor 6 almost horizontally. The radiation monitor 6 is provided with a table 5, a carry-out port 23, and a housing 24 containing the detectors 10 and 12, the examination room 11, the elevating device 13, the judging device 21, and the carry-out device 22. , And the above components housed in the housing 24.

[0004] 25 is a set of opposed side surfaces 25a, 25b
Are formed in an open state, and the upper stage 26a,
A tray storage section 27 having a rectangular parallelepiped shape, in which three tray storage shelves of a middle step 26b and a lower step 26c are fixedly provided such that a space having a height H1 of about 30 cm exists above each shelf. Is a tray storage section driving means for raising and lowering the storage section 25 while keeping the side surfaces 25a and 25b substantially vertical, and 28 is the tray storage section 25 and the driving means 2
7 and the above-mentioned parts housed in the housing 29, as shown in the figure, the unloading unit 28 is located outside the radiation control area.
The article unloading monitor 1 is composed of the unloading section 28 and the above-described monitor section 6. Thus, a tray carrying-in entrance 30 is provided in the housing 29 of the article carrying-out portion 28 so as to face the tray carrying-out opening 23, and a side surface 29a of the housing 29 facing the storage portion side surface 25b is opened almost entirely. The tray 8 which is conveyed from the monitor 6 through the tray outlet 23 and the tray inlet 30 in this order is stored in the storage shelves 26a to 26c.
Each unit is configured to receive and hold the data.

[0005] The monitor 1 is configured as described above, and further, the monitor 1 operates as described below. That is, in the initial state before the state in which the person who intends to carry out the article 7 from the area 3 to the outside 4 pushes the tray 8 containing the article 7 into the inspection room 11,
However, the detector 12 is lifted to the highest position by the lifting device 13, and the tray storage unit 25 is also raised to the highest position by the driving unit 27 so that the tray storage shelf 26 c is in contact with the tray support surface 22 a of the tray unloading device 22. They are in the same waiting state. Then, when the above-mentioned person pushes the tray 8 into the examination room 11 and then presses a start button of a control device (not shown), the elevating device 13 operates and the detector 12 starts to descend. When the detector 12 comes into contact with the article 7 or the tray 8, the detector 20 detects this contact and stops the descending operation of the detector 12. Thereafter, the detector 12 remains in the same state for a predetermined time τ. 10 and 12 and the judging device 21 inspect the article 7 for radioactive contamination. At the end of the time τ, the judging signal 21a is sent from the device 21.
Is output, the detector 12 is raised to the highest position again by the elevating device 13, and when the signal 21a is output, the tray 8 of the inspection room 11 is moved to the unloading device 22 if this signal 21a is a signal indicating no contamination. Then, they are conveyed sequentially through the carry-out port 23 and the carry-in port 30 and carried into the tray storage shelf 26c. Then, the tray 8 carried into the shelf 26c
Is a limit switch 31 provided at the innermost part of the shelf 26c.
c, the tray storage shelf 26b is placed on the tray support surface 2
2a so that the tray accommodating portion 25 is driven by the driving means 2.
7, the monitor 1 is again in the standby state, and thereafter the tray 8 is moved to the storage shelf 26b,
The trays 8 sequentially stored in the storage section 25 are stored in the storage section 25 by a person or the like who has come out of the area 3 to the outside 4 from the area 3 through an entrance (not shown) provided in the wall 2 from the housing side surface 29a. By being taken out, 3 in the area of the article 7
From the area to the outside 4 is completed. In the monitor 1, when a person performs a predetermined button pressing operation or the like after taking out the tray 8 from the storage unit 25, the tray storage unit driving unit 27
The tray storage shelf 26 emptied by the tray support surface 2
The drive means 27 is configured so as to be flush with the monitor 2a, and the monitor 1 is in a standby state. If the monitor 1 is not in the standby state, even if the start button is pressed, the above-described detector Is configured not to start the descent operation.

[0006]

According to the monitor 1, the carried-out article 7 is monitored for radioactive contamination as described above. In this case, the height H0 of the table 5 above the floor is about 70 cm.
And that a person having an average height of 170 cm can easily take out the tray 8 from the tray storage shelf 26 even when the tray storage section 25 is at the highest position, and In consideration of the maximum height of the article, the number of the storage shelves 26 in the storage part 25 and the above-described dimension H1 are determined.
Since there are only three stages a to 26c, the number of articles 7 that can be stored simultaneously in the tray storage unit 25 is small.
In the case of the monitor 1, during a time period when a large number of workers or the like who intend to retreat from the area 3 to the area 4 are concentrated at one time, the contamination of the articles 7 in the inspection room 11 unless the tray 8 is taken out from the storage unit 25. Since the inspection is not performed, there is a problem that traffic congestion of articles is likely to occur.

It is an object of the present invention to provide a
The number of articles 7 that can be simultaneously stored in the storage section 25 is increased by allowing the number of stages 6 and the spacing between shelves to be appropriately changed in accordance with the height of the articles 7, and the number of articles 7 from the area 3 to the area 4 outside is increased. The object of the present invention is to make it difficult for traffic jams to occur when carrying goods.

[0008]

According to the present invention, there is provided: (1) an article height detector for detecting an almost maximum height of articles in a loaded dish-like article storage tray; A radiation monitor unit, which is provided with a vessel and inspects the article for contamination by radioactive material and if the contamination is not present, unloads the article storage tray substantially horizontally; a first opening formed substantially vertically; A second opening opposed to the first opening, and wherein the article storage tray carried into the first opening from the radiation monitor section is arranged in a direction transverse to a traveling direction of the article storage tray. A plurality of trays provided with a tray guide mechanism that is supported only at both ends of the tray and holds the article as it is after being advanced while maintaining a substantially horizontal posture. The storage section and the article storage tray carried out from the radiation monitor section are held by the tray guide mechanism according to the height of the article detected by the article height detector in the article storage tray. A tray storage unit driving unit that raises and lowers the tray storage unit, and configures an article unloading monitor so as to take out the article storage tray held by the tray guide mechanism from the second opening.

2) In the article carry-out monitor described in 1) above, the radiation monitor has such a size that the radiation emitted downward from the article storage tray carried into the radiation monitor can be detected at one time. A first radiation detector provided with a planar first radiation entrance window, and a first radiation detector fixedly disposed such that the first radiation entrance window is close to and opposed to the article storage tray; A second radiation incident window having a size capable of detecting the radiation radiated at a time at a time is provided, and the second radiation incident window is opposed to the article storage tray in a substantially horizontal state. A second radiation detector disposed above the article storage tray, and raising and lowering the second radiation detector and moving the second radiation detector while the second radiation detector is descending. A detector elevating device for stopping the lowering of the second radiation detector when contacting an article in the tray, a first radiation detection signal output by the first radiation detector, and a second detector output by the second radiation detector. (2) a contamination judging device for judging the presence or absence of contamination of the article by a radioactive substance using the radiation detection signal and outputting a judgment signal indicating the result of the judgment; And a tray unloading device for unloading the article storage tray from the radiation monitor section substantially horizontally when the signal indicates that the second radiation detection is performed by lowering the article height detector by the detector elevating device. A descent amount detector for detecting a descent amount of the detector, and the descent amount detected by the descent amount detector when the descent of the second radiation detector is stopped by the detector elevating device. Based constitute an article unloading monitor to consist almost calculator for calculating the maximum height of the article in the article receiving tray,
Also,

[0010] 3) In the article discharge monitor according to any one of the above items 1) and 2), the tray guide mechanism is provided on both sides in the traveling direction of the article storage tray to be loaded into the first opening of the tray storage section. The article unloading monitor is configured as a plurality of rollers arranged in a row.

[0011]

[Operation] With the above-described configuration, in each of the article discharge monitors, a plurality of articles stored in each of the article storage trays are made to have substantially the same height, thereby achieving the conventional article discharge. The tray storage unit having the same size as the tray storage unit 25 in the monitor 1 can hold the article storage trays in four or more stages, and eventually can store more articles in the tray storage unit than in the storage unit 25. Therefore, it is possible to quickly carry out the article from inside the radiation control area to outside the control area.

[0012]

FIG. 1 is a longitudinal sectional side view for explaining the structure of an embodiment of the present invention, FIG. 2 is a perspective view of a main part in FIG. 1, and FIG. 1 and FIG. The same components are denoted by the same reference numerals as in FIGS. 3 and 4. In FIGS. 1 and 2, reference numeral 32 denotes a signal which is mechanically coupled to the motor 17 and which detects the amount of the radiation detector 12 descending by the detector elevating device 13 and which corresponds to the detection result.
The rotary encoder 33 outputs the signal 32a and the signal 20a output from the contact detector 20, and the signal 20a detects the contact between the radiation detector 12 and the article 7 or the tray 8 by the contact detector 20. When the signal content indicates that the detection has been performed, the arithmetic unit which calculates the almost maximum height of the article 7 based on the value of the encoder output signal 32a at that time and outputs a signal 33a indicating the calculation result, An article height detector comprising:
Reference numeral 35 denotes the radiation detectors 10 and 12, the inspection room 11, the detector elevating device 13, the contamination determination device 21, and the tray unloading device 22.
And a radiation monitor unit including the above-described housing 24 that houses therein and the article height detector 34, and the above-mentioned stored items in the housing 24.

The housing 36 is housed in the housing 29, has the same outer dimensions as the tray housing 25, and has a pair of opposed side surfaces 36a, 36b both open. A roller group 38 formed of a plurality of rollers 37 arranged in a row on each of a pair of opposing side surfaces 36c and 36d different from the pair of side surfaces 36a and 36b has a substantially equal interval H2 in the vertical direction. In this case, a rectangular tray storage section provided in a plurality of stages, 39 is a side surface 36
a, 36b are kept substantially vertical.
In this case, the article storage carried in the tray storage section side surface 36a from the radiation monitor section 35 through the tray carry-out port 23 of the casing 24 and the tray carry-in port 30 of the casing 29 sequentially. The tray 8 is supported by roller groups 38, 38 facing each other only at both ends of the tray 8 in a direction transverse to the traveling direction of the tray 8 and advances while maintaining a substantially horizontal posture. Two roller groups 38, 38 are provided opposite to the side surfaces 36 c, 36 d of the tray housing 36 so that the rollers 37 project into the tray housing 36 so as to be held therebetween. In this case, a tray guide mechanism 40 as a group of rollers 38, 38 arranged opposite to each other for guiding the tray 8 carried out from the monitor section 35 as described above stores the tray 8 in the storage section 36. It is provided in plurality accommodating portion 36 so as to hold across stages. Thus, of course, in this case, the roller 37 is rotatable about a rotation axis mounted perpendicular to the surface 36c or 36d.

Reference numeral 41 denotes a limit switch provided at the innermost portion of the mechanism 40 so as to operate when the tray 8 is carried into the innermost portion of the guide mechanism 40. Reference numeral 42 denotes a signal (not shown) output from each switch 41. The arithmetic unit 33 of the article height detector 34
Is a control unit that receives a signal 33a output by the controller and outputs a control signal 42a. 43 is a tray storage unit driving unit including a lifting device 39 and a control unit 42. The driving unit 43
When the signal 33a is input to the control unit 42, the control unit 42
After examining the state of each output signal of the switch 41 at that time, a tray guide mechanism 40 corresponding to the height of the article 7 indicated by the signal 33a is selected, and the tray 8 at which the signal 33a is output is monitored. The tray storage unit 36 is configured to be moved up and down by the elevating device 39 so that the tray storage unit 36 is held by the guide mechanism 40 selected as described above after being unloaded from the unit 35. Reference numeral 44 denotes the article unloading section 2 of FIG. 3 which includes the housing 29, the above-described tray storage section 36 stored in the housing 29, and the storage section driving means 43.
Reference numeral 45 denotes an article unloading section corresponding to 8 and an article unloading monitor 45 as an embodiment of the present invention, comprising the unloading section 44 and the above-described monitor section 35.

Since the monitor 45 is configured as described above, in this case, the lower tray 8 held in the tray storage portion 36 and the upper tray held directly above the lower tray 8 The distance between the tray 8 and the tray 8 changes in accordance with the height of the articles 7 stored in the lower tray 8 by a dimension that is an integral multiple of the above-described distance H2.
If the size of the tray 2 containing the small tool such as a screwdriver is set to a size that does not hinder the holding of the tray 8 by the tray guide mechanism 40, for example, 5 cm, the tray 8 is stored in the storage portion 36 over four or more steps. It is clear that more items 7 can be simultaneously stored in the storage unit 36 than in the conventional monitor 1, and therefore, according to the monitor 45, the radiation control area 3 to the control area 4 can be stored. Can be quickly carried out without causing traffic congestion.

In the above embodiment, the tray guide mechanism 40 is
Opposite roller group 3 as rollers 37 arranged in a row on both sides in the traveling direction of the tray 8 carried into the side surface 36a as an opening of the tray storage portion 36, respectively.
However, in the present invention, the tray guide mechanism may be constituted by two opposite rails having a fitting structure in which the ends of the tray 8 are fitted to each other.

[0017]

As described above, according to the present invention, 1) an article height detector for detecting an almost maximum height of articles in a loaded dish-shaped article storage tray is provided, and A radiation monitor for inspecting the presence or absence of contamination by a radioactive substance and unloading the article storage tray substantially horizontally if there is no such contamination, a first opening formed substantially vertically, and the first
A second opening opposed to the opening is provided, and the article storage tray carried into the first opening from the radiation monitor is supported only at both ends of the article storage tray in a direction crossing the traveling direction of the article storage tray. A plurality of tray storage sections are provided so that the tray guide mechanism can hold the article storage tray in a plurality of stages, and can be carried out from the radiation monitor section so as to be held as it is after traveling while maintaining a substantially horizontal posture. Tray storage section driving means for raising and lowering the tray storage section so that the article storage tray to be held is held by a tray guide mechanism corresponding to the height of the article detected by the article height detector in the article storage tray. An article unloading monitor configured to take out the article storage tray held by the tray guide mechanism from the second opening;

2) In the article carry-out monitor described in the above item 1), the radiation monitor has such a size that the radiation radiated downward from the article storage tray carried into the radiation monitor can be detected at one time. A first radiation incident window is provided, and the first radiation incident window is fixedly disposed so as to face and close to the article storage tray.
A radiation detector and a planar second radiation entrance window large enough to detect radiation radiated upward from the article storage tray at a time, and the second radiation entrance window is substantially horizontal. A second radiation detector positioned above the article storage tray opposite to the storage tray, and an article storage tray or the article when the second radiation detector is raised and lowered and the second radiation detector is lowered A detector elevating device for stopping the lowering of the second radiation detector when it comes into contact with an article in the storage tray, a first radiation detection signal output by the first radiation detector, and a second radiation output by the second radiation detector A contamination determination device that determines the presence or absence of contamination of the article by the radioactive material using the detection signal and outputs a determination signal indicating the result of the determination; and the determination signal is input and the determination signal is A tray unloading device for unloading the article storage tray substantially horizontally from the radiation monitor unit when the signal indicates absence of the signal, and further lowering the article height detector by the detector elevating device by the second radiation detector. A descending amount detector for detecting the amount of the article in the article storage tray based on the descending amount detected by the descending amount detector when the descending of the second radiation detector is stopped by the detector elevating device. The article unloading monitor is composed of a computing unit that calculates the highest height,

3) In the article discharge monitor according to any one of the above items 1) and 2), the tray guide mechanism is provided on both sides in the traveling direction of the article storage tray carried into the first opening of the tray storage section. The article discharge monitor was configured as a plurality of rollers arranged in a row.

[0020] For this reason, with the above-described configuration, in each of the article carrying-out monitors, a plurality of articles contained in each of the article-receiving trays are made to have substantially the same height, so that the conventional article-carrying tray has the same height. Article unloading monitor 1
Can hold the article storage trays in four or more stages in the tray storage section having the same size as the tray storage section 25 in the first embodiment, and eventually can store more articles in the tray storage section than in the storage section 25. Therefore, the present invention has an effect that the articles can be quickly carried out from the radiation control area to the outside of the control area.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view illustrating the configuration of an embodiment of the present invention.

FIG. 2 is a perspective view of a main part in FIG. 1;

FIG. 3 is a vertical sectional side view for explaining the configuration of a conventional article carry-out monitor.

FIG. 4 is a perspective view of a main part in FIG. 3;

[Explanation of symbols]

 Reference Signs List 7 Article 8 Article storage tray 10 First radiation detector 10a First radiation incident window 10b First radiation detection signal 12 Second radiation detector 12a Second radiation incident window 12b Second radiation detection signal 13 Detector elevating device 21 Contamination judgment Device 21a Judgment signal 22 Tray unloading device 32 Rotary encoder (Descent amount detector) 33 Calculator 34 Article height detector 35 Radiation monitor unit 36 Tray storage unit 36a Side (first opening) 36b Side (second opening) 37 roller 40 tray guide mechanism 43 tray storage section driving means 45 article unloading monitor

Claims (3)

(57) [Claims] An article height detector for detecting an almost maximum height of the articles in the dish-shaped article storage tray carried in, and inspecting the articles for contamination by radioactive substances; If there is no contamination, a radiation monitor unit that unloads the article storage tray substantially horizontally, and a first vertically formed first storage unit.
An opening and a second opening opposed to the first opening are provided, and the article storage tray carried into the first opening from the radiation monitor section extends in a direction transverse to a traveling direction of the article storage tray. A plurality of tray guide mechanisms are provided so as to be able to hold the article storage tray in a plurality of stages, supported only at both ends of the article storage tray, and kept as it is after traveling while maintaining a substantially horizontal posture. A tray storage section and the article storage tray carried out from the radiation monitor section are held by the tray guide mechanism according to the height of the article detected by the article height detector in the article storage tray. Tray driving means for raising and lowering the tray storing section, so that the article storing tray held by the tray guide mechanism is opened to the second opening. Article out monitor, characterized in that removal from the part. 2. The article discharge monitor according to claim 1, wherein the radiation monitor has a size capable of detecting radiation radiated downward from the article storage tray carried into the radiation monitor at a time. A first radiation incident window having a planar shape, and a first radiation incident window fixedly disposed so as to face and close to the article storage tray;
A radiation detector, and a planar second radiation entrance window large enough to detect radiation emitted upward from the article storage tray at a time, and the second radiation entrance window is substantially horizontal. A second radiation detector disposed above the article storage tray so as to face the article storage tray; and a second radiation detector that moves up and down the second radiation detector and stores the article while the second radiation detector is descending. Contacting the tray or an article in the article storage tray with the second
A detector elevating device for stopping the lowering of the radiation detector; and a first radiation detection signal output by the first radiation detector and a second radiation detection signal output by the second radiation detector. A contamination judging device for judging the presence or absence of contamination by a radioactive substance and outputting a judgment signal representing the result of the judgment; and the article accommodation tray when the judgment signal is input and the judgment signal is a signal indicating no contamination. A tray unloading device for unloading substantially horizontally from the radiation monitor unit, and a drop amount detector for detecting a drop amount of the second radiation detector lowered by the detector lifting device by an article height detector. And when the lowering of the second radiation detector is stopped by the detector lifting / lowering device, the lowering of the second radiation detector is performed based on the lowering amount detected by the lowering amount detector. Article out monitor, characterized in that is constituted by an arithmetic unit for calculating a substantially maximum height of the article. 3. The article unloading monitor according to claim 1, wherein the tray guide mechanisms are arranged in a line on both sides in the traveling direction of the article storage tray to be loaded into the first opening of the tray storage unit. An article unloading monitor characterized in that a plurality of rollers are arranged in each of the articles.